EPA-650/2-74-090
CHARACTERIZATION  AND  CONTROL
       OF  ASBESTOS  EMISSIONS
         FROM  OPEN  SOURCES
                       by

             C. F. Harwood and T. P. Blaszak

                 IIT Research Institute
                  10 West 35th Street
                Chicago, Illinois 60616
                Contract No. 68-02-1348
                 ROAP No. 21AFA-004
              Program Element No. IAB015
           EPA Project Officer: D. K, Oestreich

              Control Systems Laboratory
           National Environmental Research Center
         Research Triangle Park, North Carolina 27711
                   Prepared for

          OFFICE OF RESEARCH AND DEVELOPMENT
         U.S. ENVIRONMENTAL PROTECTION AGENCY
               WASHINGTON, D.C.  20460

                   September 1974
                         i /»
                         I (I/

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This report has been reviewed by the Environmental Protection Agency
and approved for publication.  Approval does not signify that the
contents necessarily reflect the views and policies of the Agency,
nor does mention of trade names or commercial products constitute
endorsement or recommendation for use.
                                  11

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                          ABSTRACT

      The  report  reviews  control  technology applicable to as-
 bestos  emissions from  open  sources  including asbestos mines,
 mills,  and  manufacturing waste piles.  It combined a litera-
 ture  review with visits  to  asbestos mining and manufacturing
 operations, and  considered  climatology,  location, and topo-
 graphy.   The  study, which included preliminary field sampling,
 produced  a  comprehensive bibliography on emissions control.
 The health  effects of  asbestos exposure were reviewed from
 two aspects:   the significance of fiber  size, and the effect
 of non-occupational exposure.  Fiber size considered to be
 most  harmful  is  still  not established and, while non-occupa-
 tional  exposure  probably does not lead to asbestosis, evidence
 relates it:  to increased  incidence of cancer.  The U.S. asbes-
 tos industry  has been  reluctant  to adopt control technology
 for its mining and waste dumping operations which is already
 available for other industries;  probable reasons include the
 relatively  small, low  profit nature of the industry and the
 relatively  recent recognition of the hazardous nature of as-
 bestos.   All  eight U.S.  mine sites were  contacted; three of
 them  are  no longer operational.  Data analyses indicated that
 asbestos  can  be  detected at considerable distances from a
 given source.  It was  concluded  that, because of their proxi-
mity  to populations, asbestos manufacturing waste piles are
 a more serious threat  to public  health than asbestos mining.
     This work was submitted in  fulfillment of Phase I of
 IITRI Project Number C6290, EPA  Contract Number 68-02-1348
by the IIT Research Institute under the  sponsorship of the
Environmental Protection Agency.  Work was completed as of
May 31, 1974.

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                           CONTENTS

                                                         Page
 Abstract                                                 iii
 List of Figures                                          v
 List of Tables                                           vii
 Acknowledgements                                         viii
 Sections
 1    Conclusions                                          1
 2    Recommendations                                      3
 3    Introduction                                         5
 4    Literature Review                                    7
 5    Site Surveys                                        44
 6    Field Testing for Asbestos Emissions                67
 7    Topographic, Demographic,  and Meteorological Data   90
 8    The Significance of Asbestos Emissions from
      Open Sources                                       102
 9    References                                         118
10    Appendices                                         123

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                           FIGURES



No.                                                     Page

 1   Possible Areas of Asbestos Deposits                 16

 2   Dust Control for the Gardner Denver PR-143
     Impact Drill                                        20

 3   Dust Control for the Bucyrus Erie 40-R
     Rotary Drill                                        21

 4   Dust Control for the Gardner Denver
     Secondary Drill                                     23

 5   Explosion Breakage Process                          26

 6   The Ventilator Sprinkler                            28

 7   Dust Control for the Jaw Crusher                    29

 8   An Electric Portable Saw with Shroud for Fitting
     Exhaust Ventilation Unit                            43

 9   A Portable Hand Drill Suitable for Use with
     Exhaust Ventilation Units                           43

10   Flow Sheet for Asbestos Wet-Milling Process         55

11   Schematic Diagram of Sampling Strategy              69

12   Schematic Layout and Sampler Locations,
     Coalinga, California                                71

13   Map of Waukegan, Illinois Site and Sampler
     Locations                                           73

14   Map of Johns-Manville Site, Denison, Texas          75

15   Sampler Locations for ESED, EPA Study,
     Ambler, Pennsylvania                                86

16   Topographic Map of the Vicinity of the Johns-Manville
     Asbestos Mine and Mill at Coalinga, California      91

17   Topographic Map of the Vicinity of the Johns-Manville
     Asbestos Products Plant at Waukegan, Illinois       92
                              v

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                       FIGURES (cant.)
No.                                                     Page
18   Topographic Map of the Vicinity of the Johns-Manvilie
     Asbestos Cement Pipe Plant at Denison, Texas        93
19   Topographic Map of the Vicinity of the GAF Asbestos
     Mine and Mill at Eden Mills, Vermont                94
20   Demographic Map of the Vicinity of the Johns-Manville
     Asbestos Mine and Mill at Coalinga, California      96
21   Demographic Map of the Vicinity of the Johns-Manville
     Asbestos Products Plant at Waukegan, Illinois       97
22   Demographic Map of the Vicinity of the Johns-Manville
     Asbestos-Cement Pipe Plant at Denison, Texas        98
23   Demographic Map of the Vicinity of the Nicolet,
     Certain-Teed Asbestos Products Plant at
     Ambler, Pennsylvania                                99
24   Asbestos Fiber Concentration Isopleths for
     Coalinga, California                               112
25   Asbestos Fiber Concentration Isopleths for
     Waukegan, Illinois                                 113
26   Asbestos Fiber Concentration Isopleths for
     Denison, Texas                                     114
27   Asbestos Fiber Concentration Isopleths for
     Ambler, Pennsylvania                               115
                             VI.

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                           TABLES



No.                                                     Page

 i   A Partial List of Asbestos Outcrops                 14

 2   Drill and Dust Collection Data                      24

 3   Chemical-Vegetative Hydroseeding Costs for
     Treating a Plot of 4,047 m2 (One Acre)              36
                                      2
 4   Cost of Stabilization Per 0.04 km  (10 Acre)
     Plot                                                39

 5   The United States Asbestos Mines                    45

 6   Sampling Data and Ambient Air Concentrations  of Fibers
     ir. the Vicinity of the Johns-Manville Asbestos Mill
     Tailings Pile; Coalinga, California                 79

 7   Sampling Data and Ambinet Air Concentrations  of Fibers
     in the Vicinity of the Johns-Manville Waste Dump;
     Waukegan, Illinois                                  80

 8   Sampling Data and Ambient Air Concentrations  of Fibers
     in the Vicinity of the Johns-Manville Waste Dump;
     Denison, Texas                                      81

 9   Sampling Data and Ambient Air Concentrations  of Fibers
     in the Vicinity of the Johns-Manville Waste Dump;
     Denison, Texas                                      82

10   Ambient Air Concentrations of Asbestos from EPA
     Study at Ambler, Pennsylvania                       89

11   Wind Rose Sources                                  100

12   Stability Classes                                  107

13   Input Data for the Climatological Dispersion  Model 109
                              VI1

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                      ACKNOWLEDGEMENTS

     The cooperation and help of the Johns-Manvilie Company
is gratefully acknowledged.  They contributed freely of their
time and personnel to aid the on-site testing programs.  The
help of the GAP and Union Carbide Companies is also acknow-
ledged as they escorted IITRI personnel through their facil-
ities in Eden Mills, Vermont and King City, California,
respectively.
     The help and guidance of Mr, Dennis Drehmel, the
original EPA Project Officer, and his successor, Mr. David
Oestreich, are acknowledged.  The Environmental Enforcement
Division of the EPA aided this study by providing ambient air
survey data from Ambler, Pennsylvania.
     Professor Karl B. Schnelle of Vanderbilt University,
Nashville Tennessee, acted as meteorological consultant to
this program.  His assistance is acknowledged.
     IITRI personnel working on this program were:  David
Becker,  who produced the bibliography; Scott Preece, who ob-
tained dispersion data through the CDM computer model;
Erdmann Luebcke and Dr.  Madhav Ranade, who undertook field
testing; and Anant Samudra and Paul Siebert, who obtained
electron microscope analyses.  The Project Leader was
Dr. Colin F. Harwood, assisted by Thomas Blaszak.  John
Stockham, Manager of Fine Particles Research, had administra-
tive responsibility for the program.
                              VI3-1

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                          SECTION 1
                         CONCLUSIONS

     The control technology applicable to open sources of
asbestos emissions have been reviewed.  Particular attention
was given to mining operations and to waste dumps.  Site
visits were made to asbestos mines and preliminary emission
data was collected at one mine and two waste dumps.
     Only five of the eight asbestos mine sites in the United
States were active, and all but two have stated their inten-
tion to close during 1974.  All of the mines, active or inac-
tive, are,located in remote rural areas.  The control of
emissions from mining operations is virtually non-existent.
Techniques used in other industries in controlling emissions
from drills, blasting, and haulage and dumping operations
utilizing, for example, sprays, foams, and enclosure are
rarely applied in the asbestos industry.
     Waste dumps from asbestos product manufacturing operations
are frequently located in high density population areas.
Emissions are created both at the time of transfer of waste
to the dump and when the surface is eroded by weather action.
Present emission control methods, where applied, are inadequate.
Dumps in other industries are stabilized using physical,
chemical, or vegetative coverings and transfer operations are
controlled by sprays, foams, and enclosures.
     Preliminary ambient air samples were collected using
membrane filters at two waste dumps and one mine site.  Further,

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ambient air data from a waste dump was supplied by the
Environmental Protection Agency.  The samples were analyzed
by optical and electron microscopes.  The distance travelled
by the asbestos fibers was predicted using the Climatologi-
cal Dispersion Model.
     It was found that fibers smaller than 1.5 ym exceeded
those greater than 1.5 pm by about three orders or magnitude.
Typically, about 10  fibers per cubic meter greater than
1.5 pm, and 10  fibers per cubic meter smaller than 1.5 ym
were found at a source.  The rate of reduction in the num-
ber of fibers per cubic meter as a function of distance was
slow.  At a distance of ten kilometers from the source, the
number of fibers per cubic meter greater than 1.5 ym was
typically about 10, and the number of fibers smaller than
                   ft
1.5 ym was about 10 .  Beyond ten kilometers, the informa-
tion from the model was eratic and unreliable.
     Despite extensive research over the past decade, medical
authorities still disagree on the health significance of
asbestos exposure.  While it is known that asbestos can pro-
duce asbestosis and cancer, the exact dose relationship,
the most harmful fiber size, and the mechanism of disease
induction, are still not precisely defined.  It is extremely
unlikely that the answers to these important questions will
be known for some years to come.
     It is concluded that in the light of the reported num-
ber of cases of cancers resulting from non-occupational
exposure to asbestos, that it is necessary to implement
methods of reducing emissions from open sources,  particular-
ly those sources in urban regions.

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                          SECTION 2
                       RECOMMENDATIONS

     Phase I of this program was limited to a review of the
control technology applicable to the emission of asbestos
from open sources.  In order to assess the significance of
open sources in terms of population exposure levels, a pre-
liminary field sampling study was included.
     It is recommended that waste dumps, because they are
located in heavily populated areas and have been shown to
emit large numbers of fibers, should be studied further.
Asbestos mining operations, although they emit more fibers
than dc waste dumps, are regarded  a  less serious health
threat because they are few in number and because they are
found in very remote unpopulated areas.
     Transfer operations at waste piles where asbestos is
dumped, crushed, and spread  can be seen to raise visible
clouds of dust.  There is a need to study methods of abating
this dust.  It is recommended that the use of spray systems,
foams, or total enclosure should be tested.
     Waste dumps are subject to erosion by wind, rain, sun,
and frost action.  Methods are available to stabilize the
tailings piles from various mining operations using chemical,
physical,  and vegetative coverings.  Their applicability to
asbestos waste piles should be tested and their effective-
ness established.

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     Technical feasibility and economic evaluation of all
potential methods for reducing emissions from asbestos waste
dumps and transfer operations should be undertaken.  Field
testing of those options deemed to be most applicable is
recommended.  Cost effectiveness data on these options can
then be performed.
     It is desirable that further improvements to the Cli-
matological Dispersion Model should be made.  The objective
would be to extend the distance from the source to the
receptor for which the results are valid.
     The fate of sub-micron aerosol particles suspended in
ambient air has not been sufficiently studied.  Limited
studies have shown that the scavenging action of rain and
snow is extremely inefficient.  The possibility is very
real that they remain suspended for very long time periods
and that they are continually increasing in concentration.
It is recommended that the life cycle of asbestos emissions
should be studied.
                              4

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                          SECTION 3
                        INTRODUCTION

     Open sources of asbestos emissions include mines,
dumps, and storage areas.  In the United States, asbestos
mines are located in four states; Arizona, North Carolina,
Vermont, and California.  They are located in areas of very
low population densities.  Dumps and open storage areas
associated with asbestos product manufacturing are frequent-
ly found in areas of high population density.
     The original objective of Phase I of this program was
to review the control technology applicable to the emission
of asbestos from open sources.  In particular, mining opera-
tions, dumps, and storage areas were to be considered.  This
was to be accomplished by a review of the literature and by
visiting the asbestos mine sites.  As a part of the survey,
attention was to be given to the location of the mines and
their climatology and topography.
     Under a modification to the program, the scope was
extended to include a preliminary field sampling study.  The
revised plan was not an in-depth study; only a minimum
amount of data was to be obtained.  Emission data obtained
at one mine and two dumps was to be subjected to analysis
using the Environmental Protection Agency's Climatological
Dispersion Model.  Used in conjunction with local annual
weather rose and demographic data, an assessment of the
health significance was to be made.  The sites selected

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for emission sampling were the Coalinga Asbestos Company (a
division of Johns-Manvilie) mine at Coalinga, California,
and the waste dumps at the Johns-Manville asbestos cement
products manufacturing plants at Waukegan, Illinois and
Denison, Texas,
     Under a further modification to the program, the results
of a study conducted at the waste dump of the Certain-Teed
and Nicolet Industries asbestos cement processing plant at
Ambler, Pennsylvania was incorporated into the study.  The-
samples had been- collected by the Environmental Protection
Agency, Environmental Standards Enforcement Division, and
analyzed for asbestos content by the Battelle Memorial
Institute.
     As a result of Phase I of this study, the open sources
of asbestos emissions which are considered to be most signi-
ficant will be established.

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                          SECTION 4
                      LITERATURE REVIEW

INTRODUCTION
     The literature on asbestos is extensive.  However, pa-
pers pertinent to the present study are quite limited.  In
this section, the literature relating to health effects and
to the control of emissions from open sources is reviewed.
     Two aspects of the health effects problem are of par-
ticular significance to the present study.  They are the
effect of fiber size on the hazard potential, and the effect
of non-occupational exposure to asbestos.
     Literature on the control of emissions from open asbes-
tos sources is extremely limited.  For this reason, the con-
trol of emissions from mining and dumping operations in other
industries was reviewed.  The open sources reviewed included
overburden removal, drilling, blasting, loading, hauling,
dumping, storing, field fabrication, and waste disposal.
In addition, the natural asbestos outcrops, constituting
very large areas from which emissions may be released, were
reviewed.
ENVIRONMENTAL EXPOSURE TO ASBESTOS
The Affect- of Fiber Size
     The size range of asbestos fibers that are potentially
dangerous to health Is not yet established.  Occupational

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safety standards consider the number of fibers in a given
air sample which have a length in excess of 5 ym and an
aspect ratio of greater than 3:1, length to breadth.  The
standard is based on the resolution limits of the light
microscope rather than any known effects of fiber size on
health.  It is effectively an index of exposure rather than
a measure of absolute emission.
     The validity of an exposure index can be seriously
criticized, particularly when applied to non-occupational
situations.  It is generally recognized that aerosolized
particles greater than 5 urn in size are small in number com-
pared to those less than 5 ym.  The difference can, in fact,
be several orders of magnitude1.  In the case of asbestos,
the ratio will be affected by the efficiency of the gas
cleaning system (where used), and the length of time the
fibers are airborne.  This latter factor will determine the
removal of fibers from the atmosphere by gravitational depo-
sition, and the scavenging action of rain and snow.
     As yet, there are no accepted health standards based on
the number of fibers less than 5 ym in length.  The potential
adverse health effect of these fibers is being debated.
Selikoff2 believes they are harmful based on his findings  '
that they are present in the lungs of a very high percentage
of the population of the United States, including those who
have died from lung cancer and mesothelioma.  Other scien-
tists3 state that small fibers are cleared from the lung by
phagocytosis action and that only large fibers remain lodged
in the lung.  They attribute the presence of small fibers to
the break-up of large ones after they become lodged in the
lung.   Other scientists argue that since only small fibers
are capable of penetrating into the narrow passages of the
lung,  they are the dangerous fibers.

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     A significant contribution to this controversy, based
on experimental data, is that of Stanton, et al1*.  It is
his finding that fibers in the size range of 10 to 100 ym
in length promote tumors, while below this size the harm-
ful effects are very much reduced.  His work has been
criticized because of the method of exposure whereby a fiber
glass patch containing a 40 nag portion of asbestos was
attached to the pleura by surgery.  Thus, the asbestos by-
passed the normal defense mechanism of the respiratory
system.
     Other workers, however, have found that small fibers
may be harmful.  Wagner and Berry5 have produced a super-
fine sample of asbestos from standard Grade 7 asbestos
samplgis,  The finest material was selected by water sedi-
mentation.  Meseotheliomas were readily produced in hamsters
and rats following intra-pleural inoculation of this asbes-
tos.  The same result was found by Timbrell and Rendall6
using asbestos samples ground to a fine size.
     Other workers have been unable to induce any fibrogenic
activity with short (< 5 ym) fibers.  Gross7 has injected
rats intratracheally with large doses of fibers less than
5 'Mm In length and no tumors were produced.  Similar lack of
success in inducing tumors were reported by Smith8 and by
Hilscher9, and as referenced by Gross7; separate studies of
Claysen, Davis, and Swinbourne.  The latter three researchers
did not publish their works because of their negative
findings.
     A possible reason for this lack of success10   is the
conversion of the asbestos to a non-crystalline material
by the heat generated during the grinding of the asbestos
to a small size.   This is contradicted by the fact that
wet grinding was used by Smith8,  that a microtome method

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was used by Hilscher9,
     It should also be realized  that in the animal experi-
ments, massive dosages were used to accelerate the incuba-
tion period.  That is, the period from the initial exposure
to asbestos to the onset of malignancy.  For man, this incu-
bation period is thought to be 20-30 years.  There is, as
with all such animal studies, some question as to the valid-
ity of the acceleration techniques,
Asbes_tos in Non-Occupational Areas
     A number of studies have shown asbestos is present in
the general atmosphere.  A study of air pollution from an
asbestos mine in Finland, by Laamanen, Noro, and Raunio11 ,
found asbestos at distances up to 50 km from the mines.  Dust
                                         2
fall  rates were measured at 1.52 g/100 m /month at 4 km and
            2
34.6 g/100 m /month at 0.5 km.   At the asbestos quarry, dust
                         3
levels of 7.5 to 100 mg/m  were  found; it was estimated that
between 1 and 5.4% was asbestos.
     Schepers12  describes the dust from asbestos mines and
mills in South Africa, which rolled through like a morning
mist.  They claimed that food in a local hotel was gritty
with dust.  In 1947, Sluis and Cremer13  reported dust counts
measured by optical microscope to be 80 to 840 fibers/cc
in mines and 162 to 1,920 fibers/cc in mills of South Africa.
     Bobyleva, et al14, measured asbestos originating from
asbestos manufacturing plants at distances of 40 to 80 kin
(25 to 50 miles).  In surveys taken at three different
plants in the U.S.S.R., they found concentrations ranged from
               3
0 to 6,000 pg/m  at distances of 3 km, at 1.0 to 1.5 km it
                        •3
was 3,000 to 33,000 yg/m , and 0.5 km it was 6,000 to
34,000 yg/m3.
                             10

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     Lumley, et al15  , monitored the emissions from an area
in which crocidolite and atnosite asbestos were stored.
Light microscope analysis of the collected samples showed
                              /•         f\
that levels of up to 52.6 x 10  fibers/m  were found in
areas where the air was disturbed by worker activity.
     A survey of optical count levels for asbestos in buil-
dings which contained some asbestos-based materials in their
construction was made by Byrom, et alls  .  The results were
found to vary with the type of building and the construction
                                                       3
material used.  In the lowest instances, 5,000 fibers/m
were recorded, while in the highest, levels of 80,000
        3
fibers/m  were found.  Buildings not containing asbestos con-
                                                        3
struction materials were found to contain 4,000 fibers/m .
This latter figure presumably represented the background
level of asbestos.
     Nicholson17 , and Selikoff18  have reported ambient
air asbestos concentration figures for a number of large
cities.  New York City asbestos levels were found to vary
                      3
between 11 and 60 ng/m , while near a fire-proofing opera-
                              3
tion, levels of 15 to 180 ng/m  were recorded.  Philadelphia
                   3                                   3
gave 45 to 100 ng/m  , Ridgewood, New York, gave 20 ng/m ,
                                                    3
and Port Allegheny, Pennsylvania,  gave 10 to 30 ng/m .
     Simecek19 , in Czechoslovakia, investigated the dust in
an asbestos ore processing plant and its surroundings.  It
was found that dust in the neighborhood of the mine was
fairly constant throughout the year at a level of 0.033 to
          3
0.392 mg/m .  About 178 of this dust was estimated to be
                                  3
asbestos, giving 330 to 3,920 ng/m  asbestos.
     A striking number of mesothelioma cases were reported
by Bohlig2 a among the people residing near large asbestos
factories and shipyards in Hamburg, Germany.  No exposure
                             11

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levels are reported, and none were estimated because emission
controls have improved during the past 20 years.
     Mesotheliomas have occurred after: short exposures to
asbestos and in those exposed at home to dusty clothing or
to a neighboring source of asbestos air pollution,  A sur-
vey of these findings in the London area of England was made
by Newhouse and Thomson21 .  Similar results following light
exposure have been reported by Lieb'en22 and by Wagner23 .
     Exposure to asbestos through water supplies has come
very much to the public attention largely through the liti-
gation proceedings resulting from the contamination of
Duluth's water supplies by the Reserve Mining Company.
Taconite tailings dumped-in Lake Superior have been found to
contain a large number of fibrous particles of the amosite
type.  Sargent21* studied a number of water supplies in the
Vermont area.  The 'conclusion is that asbestos cement pipe
will add to the asbestos content of water supplies.  This
is also the conclusion of Johns-Manville25'26 , who have
been a major supplier to the 320,000 km (200,000 mile) net-
work of water carrying asbestos cement pipe in the United
States.
NATURAL SOURCES OF EMISSIOHS
     The deposits of asbestos, which are of sufficiently
high grade for commercial exploitation, represent only a
small portion of the total outcroppings,   At the present
time, asbestos is mined in Vermont, California, and
Arizona.  The Chicago Natural History Museum exhibits asbes-
tos ore samples from a number of counties throughout the
U.S.A., as shown In Table 1.  The areas in which asbestos
is likely to occur have been surveyed by various government
agencies, including the State Department of Natural Resources,
                             12

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the U.S. Bureau of Mines27 , and the Environmental Protection
Agency26 .  Their findings  are summarized in the map Figure 1.
     Chrysotile asbestos is found in serpentine rocks which
were formed by the metamorphosis of ultrabasic volcanic rocks
There is a high probability of finding ehrysotile asbestos
wherever serpentine is found.  Even when visible veins are
absent, chrysotile is invariably present when the rock is
crushed and subjected to close microscopic scrutiny,
     Arnphibole asbestos in deposits of commercial value are
found in metamorphic rocks of sedimentary origin.  The com-
mon ultramafic rocks of igneous or metamorphic origin are
also known to contain asbestiform amphiboles.
     Because of their wide occurrence, natural sources could
well constitute a major source of asbestos background levels.
Activities of man, including farming, land development, and
road building could activate the release of fibers and ex--
pose surfaces enabling erosion by natural elements to occur.
These emissions would be in addition to the emissions
occurring from these deposits without man's intervention.
     At: the present time,  there is no reference in the liter-
ature which cites the control of natural sources o£ asbes-
tos emissions.
DUST CONTROL IN ASBESTOS MINING
Introduction
     With the exception of the small mines in Arizona, the
mining of asbestos in the United States is done by open-pit
methods. This type of mining generates large amounts of
dust which are difficult to confine.  Efforts to prevent
asbestos dust from becoming airborne during mining operations
are minimal.  Dust suppression techniques are employed by
                             13

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  Table 1.  A PARTIAL LIST OF ASBESTOS OUTCROPS
            Location
     State
Clebern County
Dahl River
Kobek
Shanak River
Yabapia County
Garland County
Duval County
Oscaloose County
Habersham
Pine Mr. Mine, Robin County
Sail Mt. Sautee
Washington County
Buchanan County
Greenup
New Orleans County
Penobscot
Blue Mt, Quarry, Baltimore
Suffolk County
Sturgeon Falls
Huron County
Jackson County
Douglass County
Lincoln County
Humboldt County
Cumberland County
Alabama
Alaska

Arizona
Arkansas
Florida
Georgia

Idaho
Iowa
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan

Missouri
Nebraska
Nevada

New Jersey
                       14

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     Table 1 (continued),   A PARTIAL LIST OF
                ASBESTOS OUTCROPS
            Location
     State
Royal John Mine, Grant County
Dutchess County
Vance County
Bakersville County
Mason County
Cuyahoga
Multnomah
Adam Gordons Place on
  Branch Creek, Grant County
Josephus County
Lazerne County
Brintons Quarry, Chester County
Easton, E, end of Chustnut Hill
Lawrence County
Davidson County
Bexa County
Weber County
Blue Ray County
Bedford County
Berkeley County
King County
Albany County
Caster Mt,, Natrona County
  Encampment
New Mexico
New York
North Carolina

Ohio
Oregon


Pennsylvania

South Dakota
Tennessee
Texas
Utah
Virginia

W. Virginia
Washington
Wyoming
                       15

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Areas of the U.S. which may
contain nafyral occurrences of
as&estiform minerals in bedrock
(areas containing  igneous or
metarr.orphie rocks)
                     Figure 1.   Possible areas of asbestos  deposits
                                  (Taken  from  Reference  72)

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other industries which use open-pit methods.  These control
methods are applicable to the asbestos mines with little or
no modification.
Spraying to Suj>j3ress_Dusts
     The most common' method used to control dust in open
areas is to spray the surface.  The spray may be just water
or water containing both organic and inorganic wetting
agents, oils, and polymers.
     Herod29 discusses the control techniques used in the
lime industry.  Sprays from towers are used to control
emissions from ore stock piles.  Chemical additives are used
with the water sprays to bind the top surface of the pile for
more lasting emission control.  On unpaved roadways, oil
sprays are preferred to water, although attention must be
given to the odor problem and the possibility of seepage in-
to waterways.  On paved roads, vacuum sweeper units are pre-
ferred to sprays for the reason that emissions are suppressed
only so long as the surface is wet.
     Extensive use is made of dry, powdered salts in German
mining operations.  Externbrink30  and Reusch31  describe the
use of "hygroscopic calcium chloride powders.  When these
powders are used in underground operations, they have the
added advantage of reducing the risk of fire and explosion.
In the U.S.A., powdered calcium carbonate and dolomite are
frequently used for the same purpose.
     Water sprays alone are used extensively.  Morse32  des-
cribes the use of sprays in coal mining operations in the
U.S. A,  MacLeod33  describes the dust suppression in the mines
of British Columbia citing mines containing silica and asbes-
tos as particularly important.  MacFadeen31*  refers to the
use of water sprays in the coal mines of Sydney, Australia,
                             17

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Fife35 discusses the use of water sprays underground.  He
makes the statement that chemical additives can help to
varying degrees.  Again, with reference to coal mines,
McClung36  suggests the use of water sprays to reduce dust
in U.S.A. mines.
     Sprayed foams were exhaustively tested by the British
Coal Board.  They concluded that foams were too expensive
and the application technique lacked simplicity.  More
recently, Chironis37  describes the use of a new foam made by
the Monsanto Company (Trade name EMA-54).  Preliminary tests
indicate that this foam is superior to those used previously
for dust suppression.  It forms a blanket through which the
emissions cannot easily penetrate.
Rock Drilling
     Explosives are required to dislodge and fragment ore
from the deposit.  The explosive charge is dropped into a
narrow hole drilled into the deposit.  Various types of
drills are used, including air swept rotary and percussion
drills, and water swept drills.
     Water or air sweeping serves two functions.  Firstly,
it carries broken fragments and dust away from the cutting
face.  Secondly, it reduces the temperature of the drill
bit.  Air sweeping is more commonly employed in open-pit
mines, and its use leads to dust emissions.  Water sweeping
is more common in underground mines and emissions are kept
to a low level by the water, which slurries the dust.  Water
sweeping is not frequently used in large-scale field opera-
tions because of the problems of water supply and water
freezing during winter months.
     The types of drills and related equipment used have
been reviewed by Horsley38 , Shore39 ,  and Bauer1*0 .
                             18

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 Grossmueck1*1 describes the use of cyclone and baghouse
collectors on air flushed drills.  On  water swept units, he
discusses the use of wetting agents to improve the efficiency
of the wetting,  Lewis1*2 describes the use of foam-type dust
suppressors, which are  claimed to be more efficient than
water alone.  A new type of drill, which uses a high velocity
water jet instead of a  conventional drill, is described
by Chironos1*3 .  It is claimed to be fast, dustless, explosion
proof, and economical in use.
     Hutches on"1*  reviewed the measures taken by the Quebec
asbestos industry to control dust emissions.  The extreme
cold of the  Canadian winters make the use of water drills
impossible.  Experiments have been conducted on the use of
fuel oil instead of water.  However, fuel oil causes an
obnoxious odor and contaminates the soil.
     A satisfactory solution to the dust problems associated
with percussion primary drills is an envelope-type bag filter;
it is compact and suitable for carrying on the crawler frame.
Power for operating the fan can be provided by an air motor
where no other means is available.  The bags are made of
silicate-treated nylon acetate; they shed the dust easily
and dry quickly if water is accidentally drawn into the fil-
ter.  (Figure 2 shows the diagrammatical arrangement on a
crawler drill.) Drilling by large rotary drills is performed
through a platform, and the platform itself serves as the
top of the hood.   The sides of the hood are formed with rub-
ber aprons (Figure 3).  The end apron is hinged; this enables
it to be raised when the machine is being moved; thus, pre-
venting the chips and dust from being dragged back into the
hole.  The enclosure thus formed acts as a settling chamber
so that: no chips are drawn up into the bag filter.  The dust
shaken out of the filter is discharged into this bottom
                              19

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JOY 15-BA" MATJRIAl
HANDLING  IAN

           MB404I GAIIDNtS OINVEO
           COMPBiSStD AIR MOTOR
                 J.4J H.P.
out
KOO
                                                                   lUttlt  4IAL
                                                                   OPfNING FOB
                                                                   D«ILL ROD
                                                                  ASPIRATION BUST HOOD
                                                                    OPINING TO ALLOW
                                                                      SM41L HOCKS
                                                                      TO ISCAPi
                                           6 FLtXAUSr
                                           HOSf
                                             DUST HOOD
            Figure 2.   Dust control  for  the Gardner Denver
                             PR-143 Impact  Drill
                                        20

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  IXHAUST  FAN
  3,000 C.f.M.
                                           CENTER LINE Of  HOLE
                                           AND ROTART ORIVi
                  3d BAGS
                  SlY TYPf
                « BAG
HINGED BEAR
FLAP Qt RUBBER
SKIRT
                           RUBBER SKIRT
Figure  3.  Dust control  for the  Bucyrus Erie 40-R Rotary Drill

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enclosure; thus, substantially reducing the dust emission
during the filter-emptying operation.
     Whenever possible, drilling of mine heads and the large
boulders that require secondary blasting is now done by a
mobile drill equipped with a bag filter; the filter is
cleaned automatically by compressed-air pulses (Figure 4).
     Table 2 summarizes the typical primary and secondary
drilling units together with the capacity of dust filtering
devices used.
     It is concluded1*1*  that the bag filter offers the best
type of dust control for open-pit drilling.  It offers good
environmental control with the ruggedness necessary for the
severe conditions encountered in this type of operation.
Bla.stj.ng Operations
     Emissions are created by blasting due to fragmentation
and to disturbances of the surrounding area by shock waves.
The emissions are particularly noticeable because large
numbers are released over a very short period of time, by the
large fragments also released, and by the associated noise.
     The rate at which the explosion proceeds has a demon-
stratable effect on the nature of the fragmentation.  The
shattering of rock by an explosion is referred to as brisance.
High brisance explosives proceed rapidly and have a high
shock energy and low impulse.  Conversely, low brisance ex-
plosives have more impulse and less shock energy.  They have
more general utility in mine blasting since they will loosen
large sections of rock without fragmenting.  They are environ-
mentally attractive because the dust cloud is very much re-
duced .
     Lang1*5  analyzed the means by which explosive energy is
utilized in the breakage process.  He finds there are three
                             22

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           DUST FILTER —"Mikro Pulsaire" bin vent Mode! BIN
              4A HCE dacron felt bags, solenoid valve and tinier kit.
              Mounted in housing- by C..J.M,
           FAN — Industrial exthaust,  51(0 cfm at 11  in. SP and
              5,000 rpm.
           MOTOR — Gardner Denver type. Heavy-Duty non-geared,
              MR 30A 1.
Figure 4.    Dust control for  the  Gardner  Denver
                     secondary  drill
                             23

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Table 2.  DRILL AND DUST COLLECTION DATA
Unit
Percussion drill,
Gardner Denver PR-143
Rotary drill,
Gardner Denver RDc 30
Rotary drill,
Bucyrus Erie 40-R
Secondary drill,
Gardner Denver MR 30A1
Drill Hole Diameter
cm (in.)
15.2 (4.0)
17.1 (6.75)
17.1 (6.75)
6.4 (2.5)
Filter Flowrate
1pm (cfm)
42,500 (1,500)
56,600 (2,000)
85,000 (3,000)
14,200 (500)
	 ,
Type of Fan Drive
6.2 x 105 N/m2 (90 psi)
. Compressed air
Hydraulic
Electric
6.2 x 105 N/m2 (90 psi)
Compressed air

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distinct stages as illustrated in Figure 5.  In the first
and second stages, the function of the shock wave energy is
to condition the rock by inducing numerous small  fractures.
In most explosives, the shock wave energy amounts to only
5 to 15% of the total energy of the explosive.  It is
probable, therefore, that the shock serves to condition the
rock for the final breaking stage.
     The methods to achieve optimum blasting conditions are
being actively researched in Europe, the U.S.S.R., as well
as the U.S.A.  The research is directed more towards devel-
oping efficient rock removal than reducing emissions.  How-
ever, the two events usually occur in combination.  Several
new explosives are currently being researched to achieve
these ends, they include;  1) coating ammonium nitrate
granules with suitable high explosives such as nitroglycerine,
2) use of aluminized explosives to extend the reaction zone,
3) slurry-type oil and explosive mixtures, and 4) foam-type
explosives which can be "foamed" in-situ to produce an ex-
plosive making intimate contact with the walls of the bore
hole.
     lang also discusses the use of multiple-hole blasting;
here a series o£ smaller charges have the effect of lifting
and freeing a section of the rock face.  To be effective, a
reflecting plane or free face is provided in front of each
blast hole in order to precondition the mass within the geo-
metry, detach it, and displace it horizontally.  This is
done by systematically delaying the sequence of detonation
of blast holes or groups of blast holes away from the point
of initiation.  The time interval between the detonation and
the beginning of mass motion is 5 to 10 times the shock wave
travel time from the blast hole to the free face.  The net
result is a marked reduction in fragmentation and in dust
emissions.
                             25

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Shattered  RocK
First Radial Crack*
I~5 Petition* of the outbound compression wave
  (a)  Plan view of  Stage  1
                                              Expanding
                                              Borehole
1-3 Position* of outbound compression wavt
4-5 Positions of r»f Isoted tension wave


      (b)  Plan  view  of  Stage  2
                         Original
                         Borehole
                         «~ Unloading, fh« rock breaks
                             under tension
                         —-*» Detochsd,broken mass
                             moves forward

                             (c)  Plan view of  Stage  3


                    Figure  5,   Explosion  breakage  process


                                            26

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     Grossmuech1*1  has reported on the practice of stemming
the blast holes with cartridges made of polyvinylchloride or
polyethylene.  The cartridges or ampoules are of various
shapes about 30.5 cm (12 in.) long and contain 300 cc of
water with or without wetting agents.  Reportedly, dust
concentrations are reduced by 20 to 80%.
     Water spraying is a control technique very generally
used.  It will restrict dust emissions from surrounding
surfaces during blasting, but cannot reduce the emissions
due to fragmentation from the blast hold itself.  A ventila-
tor sprinkler was described by a Russianw , Filatov, in 1973,
This device, shown in Figure 6, consists of an engine based
on that used to power the TU-114 airplane; water can be
added to the air stream.  Open mine areas up to 200 by 300 m
in depth have been ventilated by these units.  At a water
                    3
consumption of 180 m /hr, the solid content of the air is re-
                   3            3
duced from 8.4 mg/m  to 2.4 mg/m  in 28 minutes.  After
                                      3
15 minutes, it had dropped to 3.5 mg/m .
OreDumping
     Emissions are created when ore is dumped at the ore
crusher,  The measures that are taken to reduce these emis-
sions in most mining operations consists of erecting an
enclosure over the dumping pit and fitting an extractor
hood over the crusher itself.  The typical arrangement of
the hooded crusher is shown in Figure 7.  This unit, des-
cribed by Hutcheson"1* , is fitted to the Canadian asbestos
mines of Johns-Manvilie.  It is estimated that a 121.9 x
152.4 cm (50 x 60 in.) jaw crusher requires 8.5 x 10  1pm
(3,000 cfm) of air for this purpose.
     Raridveer1*7  describes the use of air curtains formed by
the use of tengential air blowers.   No details were given on
the efficiency of such an arrangement.
                              27

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                                    Direction of flow
        Figure 6.  The ventilator sprinkler
1.   Operators cabin
2.   Fuel tank
3.   Power unit platform
4.   Power unit
5.   Bearings for platform
6.   Two four bladed contra-rotating propellers

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                        »IUOW HOC*

                         MMIM*
                            X
   MIDI*
                                 ^N MOM
                                     lo »AG
                                     HUH
W-jl  W». 01 *"• ™«
     .«, W.IMH

 1 ' 75,000 1pm
                        JAW CtUSMI*

                       125x150 cm
Figure 7.   Dust  control for  the jaw crusher
                        29

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Loading and Hauling
     Loading and unloading ore from trucks» and the hauling
of ore by trucks on roadways, are all actions which can give
rise to emissions.  These activities are common to many in-
dustries; the methods of reducing these emissions are obvious,
but seldom practiced.  Loading and unloading may be carried
out in ventilated, emission controlled enclosures.  At the
least, fine spray water jets can be directed onto the dust
cloud at the source.  Emissions from ore as it jostles in
trucks may be eliminated quite simply by enclosing the load,
Currently, the loads in mining operations are completely un-
covered.  When trucks travel on public roadways, the loads
are covered by ill-fitting tarpaulins that do little to
curb emissions.
     Roadways within the mine area are frequently composed
of crushed ore bearing rock.  Under dry conditions, consider-
able emissions are created as vehicles traverse the area.
These emissions may be drastically reduced by spraying the
roadways either with water, or, for better, longer lasting
protection, with polymers, lignin sulfates, or bitumen com-
pounds1*7 '% 8 .   On paved roadways,  the use of vacuum sweepers
has been recommended as a superior approach29 .
DUST CONTROL OF ORE STORAGE AND WASTE DUMP AREAS
Introduction
     At asbestos mines and milling plants, raw ore is stored,
and at asbestos processing and mills, waste material is
dumped.  These areas constitute very large open area sources
of asbestos emissions.
Ore Storage Piles
     Milling is a continuous operation and, in many instances,
it is carried out 24 hours per day,  seven days a week.   Ore
                             30

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is stored in piles near the mill to ensure that an uninter-
rupted flow in achieved through the mill.  In this way,
problems in mining, such as weather, equipment failure, etc.,
are largely eliminated.
     The ore pile, which is rich in asbestos, is an impor-
tant source of emissions when ore is being added and removed.
Control of emissions is difficult because the pile is usually
too large to cover.  In addition, operators do not generally
like to wet the pile since this adds to the processing costs.
     Even so, wetting and the strategic deployment of wind
breaks constitute the only reasonable methods of control at
this time.  The use of foam dust suppressors with chemical
stabilizers is an attractive alternate for the future, since
they contain very little water.
Asbestos Mill Tailings Dumps
     Typically, the ore processed at the GAF mill in Vermont
contains 4 to 5% asbestos by weight.  The waste rock, which
has asbestos clinging to it, is transported to the tailings
piles.  The only controls applied are the use of covered
conveyors for the tailings transport, enclosure of the
conveyor connection points, and a semi-enclosed spout through
which the tailings are added to the pile.  The tailings are
subsequently graded to maintain the slope stability of the
piles.
     No efforts are made to reduce emissions from the piles
by vegetation or chemical stabilizers.
AsbestosProducts Manufacturing Waste Dumps
     The scraps, rejects, and other wastes from an asbestos
manufacturing process are usually dumped on a waste pile near
the plant.  The operations of the dump and its uncontrolled
exposure to the elements are sources of emission.  The trucks
                             31

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which carry the waste to the dump are uncovered.  The tipping
of the trucks, the grading and crushing of the pile by
bulldozers create emissions which are also uncontrolled.
     The covering of the inactive portions of the dump with
soil and the planting of grass is being tried at the Johns-
Manville plant in Waukegan, Illinois.  It is too early to
draw even tentative conclusions on its effectiveness.
Chemical stabilization has not been tried.  The typical
dump is left untreated.
The Eros ion by Wind
     The erosion of soil from the land has been studied for
many years.  It was stimulated by agricultural disasters
whereby huge tracts of prime agricultural lands were denuded
by very strong winds.  Unfortunately, most of these studies
are concerned with light tillable soils rather than rock
fragments or ultra-fine fibrous particles.  Such studies as
these conducted by Bagnold1*9 , Fly50 ,  Daniel" , and Chepil52
are concerned with the grading of sands and arable soils,
     In terms of this study, the most significant point is
that the erosion can be extremely extensive.  Finer materials
are preferentially removed and carried large distances.  The
smaller the particle, the greater the transport distance
(Chepil53 ).
     Woodruff54 ,  following earlier work of Chepil, has devel-
oped the following mathematical expression to describe ero-
sion:
                  E = f(I', K', C',  L', V)

where  E = amount of erosion
      I' = soil and knoll erodibility index
      K' = soil ridge roughness factor
                             32

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      C ' = local wind erosion climatic factor
      L' = field length along the erosion direction prevail-
           ing wind
       V = equivalent quantity of vegetative cover
The process of wind erosion is extremely complex and the
above equation condenses 11 primary variables known to affect
wind erosion into the five stated equivalent variables.
The purpose of the equation is to provide a tool by means of
which L) the erosion from an area may be determined, and
2) the field conditions of soil cloddiness, roughness, vege-
tative cover, physical barriers and width, and orientation
may be determined to reduce erosion to a minimum.
     The theory as it presently stands has many practical
weaknesses, mainly because of the number of variables which
interrelate in such a complex manner.  The theory was devel-
oped from laboratory experiments conducted in wind tunnels.
Woodruff55  used a wind tunnel to investigate the use of wind
breaks to reduce erosion.  Zinggss  investigated the erosion
of sedimentary deposits using a wind tunnel.  The calibration
of a wind tunnel for the simple determination of roughness
and drag on field surfaces is reported by Zingg57 .
     The conclusion is reached that the use of mathematical
analysis might be improved upon58 ,  and the theory made
more accessible through the use of computers (Skidmore59).
The use of a wind tunnel is the only method available of
obtaining direct data applicable to a given particular situa-
tion.
     The whole subject of the stability of land masses sub-
jected to changes produced by both man and nature is dis-
cussed comprehensively in a book by Beasley60 ,   Chapter 3,
which deals with the subject of wind erosion,  serves as an
                             33

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excellent introduction to the subject.  The factors which
lead to high surface erosion may be listed as:
          the surface is dry, loose, and finely divided
          the surface is smooth
          there is a lack of vegetation cover
          no physical barriers are present over a wide area
          strong winds are blowing
Any steps which will reduce these factors will reduce
emissions.
Stabilizing Mine Dumps
     The most satisfactory method of stabilizing a dump area
is a vegetative covering.  This has the combined merits of
providing a lasting protective cover and being aesthetically
pleasing to the observer.  Unfortunately, mine dumps are
frequently difficult to vegetate because the wastes are
sterile, contain deletrious inorganic salts, and lack the
essential nutrients and physical characteristics required
for sustaining vegetative growth.
     In recent years, mine waste stabilization has been
studied more actively because of safety61  following the
disastrous slope failure of a dump in Great Britain.  Also,
in many countries, the air pollution threat has encouraged
the spending of considerable sums of money to stabilize dumps,
as for example,  in the gold mine waste dumps of South Africa52
An article by James63  describes the efforts that led to the
successful stabilization of mine dumps by vegetative covering,
                 2
An area of 101 km  (25,000 acres) was stabilized despite
conditions where the pH could reach 1.5 due to oxidation of
pyrites.  It was found that adding lime was insufficient and
costly.  A better method was to trickle water through the
surface, washing the acid away.
                             34

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     The efforts to stabilize copper mine tailings from the
Pima mine in Arizona were reported recently by Ludeke61* ,
         2
A 0.34 km  (85 acre) tract has been treated.  The tailings
lacked humus, nutrients, moisture, bacteria, and microorgan-
isms essential to sustain plant life.  A mulch made from
hay or barley straw provided the above and, in addition,
insulated the surface and reduced rain erosion,
     Hydroseeding is a most efficient way 'to cover a surface,
It provides vegetative, physical, and chemical stabilization
all at the same time.  In hydroseeding, a slurry is pre-
pared from a resinous adhesive-soil seal, wood fibers,
fertilizer, seeds, and water.  This is sprayed directly onto
                                                       2
the slopes.  A two man team could treat 0.02 to 0.04 km
(5 to 10 acres) per day.  This contrasts with 6 to 8 men
taking several weeks to stabilize a surface by hand.  The
cost of the above procedure is shown in Table 3,
     Considerable amount of work on soil stabilization has
been undertaken by Dean and his co-workers at the United
States Bureau of Mines55'65> 67'68 .  In a study to investigate
the stabilization of copper mill tailings in Nevada, they
attempted physical, chemical, and vegetative stabilization.
     Physical means of stabilization included:
     *    water spray
          soil and crushed rock -- allows vegetation
          crushed or granulated smelter on inactive tailings
          ponds -- does not allow vegetation
          bark
          straw
          windbreaks and vegetation in combination
          limestone and sodium silicate
                             35

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Table 3.  CHEMICAL-VEGETATIVE HYBROSEEDING COSTS




  FOR TREATING A PLOT OF 4,047 m2 (ONE ACRE)
Item
Seeds
Fertilizer
Wood fiber
Hydroseeder
Soil seal
Labor @ $4.00 per hour
Water truck
...

Rate of Usage
41 g/m2 (75 Ib/acre)
30 g/m2 (55 Ib/acre)
815 g/m2 (1,500 Ib/acre)
2
Seeding of 4,047 m (1 acre)
2
87 cc/m (80 gal/acre)
3 men for 3 days
Water supply for seeder
, 	
TOTAL
Cost
$ 287
16
70
150
387
288
100
$l,298/acre
or 2
$0.32/m
                      36

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     Chemical means of stabilization included:
                                                      2
          Coherex, a resinous substance -- cost 1.2<:/m
          ($0.01 per sq yd)

          calcium, ammonium, and sodium lignin sulfonates --
          cost 2,4c/m2 ($0.02 per sq. yd)
                                                2
          cement and milk of lime -- cost 3,6
-------
      (b)  calcium lignosulfonate applied to a tailings pond
          area, needed 2.75 kg/m^  (1.05 Ib per sq yd) on the
          0.11 km2  (28 acre) site or 4,5c/m2 ($0.0375 per sq
          yd)
      It was found that vegetative coverings were possible if
a 15,2 cm (6 in.) layer of soil was first placed on the dump.
Multi-species plants were sown until information became
                                                       2
available on the correct seeds to sow.  A trial 0.04 km
(10 acre) plot was treated using a combination of chemical
and vegetative stabilization.  A record of the costs was
maintained,  and they are given in Table 4.
     The problem of coal mine tailings piles in the east
Kentucky area has been studied by Cummins69 .   He showed that
by studying the chemistry, pH, and climate of an area,
plants may be selected which will grow on these dumps.  As-
bestos tailings have received very little attention.
Hutches on1*1*  has described the efforts of the Quebec Asbestos
Mining Association Research Laboratories in Sherbrooke,
Quebec.  The problem they had to overcome was that serpen-
tine rock is highly alkaline, having a pH of about 9.0.
It was found necessary to mix the tailings with acidic
copper mine tailings before growth could be sustained.
OPEN-AIR OPERATIONS INVOLVING ASBESTOS PRODUCTS
Introduction
     As a consequence of its wide useage and utility of asbes-
tos products, literally hundreds of uses are found for as-
bestos in open-air operations.  The'major user of asbestos
in open-air locations is the construction industry.  Formerly,
the most obvious offender in terms of visible asbestos emis-
sions was the spraying of asbestos insulation.   Since this
practice has now been banned, insulation stripping and the
field fabrication of insulation products are the two major
areas of asbestos emissions at the present time.
                             38

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        Table 4.   COST OF STABILIZATION PER 0.04 km  (10 ACRE)  PLOT
Item
Seeds
Calcium treble
Superphosphate
Prilled urea
Coherex:
at 1.4C/A (20e/gal)
freight at 0.5c/£ (8c/gal)
Labor at $3.00/hr
Equipment expenses :
seeder and grader
water truck
Application Rate
398 seeds/m2 (37 seeds/ft2)
24.5 g/ffl2 (45 Ib/acre) P^
24.5 g/m2 (45 Ib/acre) N
5.2 £/m2 (0.18 gal/yd2)*
3 men for 3 days
water to depth of 6 mm
(%. in.) and to apply
chemicals
TOTAL
UNIT COST
Cost
$ 56
51
62
348
140
216
382
$1,2.55
3.IQc/m2
($125.50/acre)
* Coherex  solution diluted with four parts by volume of water.

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Stripping of Asbestos Insulation
     Asbestos containing products are used as insulation to
pipes, boilers, ceilings, and building super-structures.  In
many instances, the insulation was applied as a sprayed-on
cement slurry.
     Remodelling, refabrication, and demolition leads to emis-
sion of asbestos.  The methods which can be used to reduce
these demolition emissions have become part of the building
and construction codes of many large cities.  A well writ-
ten set of recommendations are those described in the hand-
book of the Asbestos Research Council70 .   Methods described
include isolation where possible, the use of water sprays,
total saturation of the insulation, and the use of disposable
sheeting and vacuum cleaners.
Field Fabrication of Asbestos Products
     A large number of asbestos containing products are used
in the construction industry.  They are sanded, cut, and
drilled in open conditions on building sites.
     The types of materials include the following:
     Pre forme d asbestos se1ections or blocks containing
materials which, by nature, are very dusty are used for in-
sulating pipes and/or boilers.  These applications may be
used for either hot or cold temperature extremes.  Examples
include:
     *    molded asbestos
          molded calcium silicate/asbestos
          molded magnesia (85%)
          molded high temperature insulating block
                             40

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     Another group is the material^which are applied in_a
wet or slurry; state.  Frequently, these materials are used
to seal joints between the blocks or  sections discussed
in the previous group.  When used this way, their composition
is similar to the material being sealed and they are mixed
with water just prior to use.  Examples are:
          calcium silicate asbestos cement
          85% magnesia
          hard-setting asbestos cement
     •    asbestos skinning plaster
     A third group of asbestos materials consist of the as-
bestos cement products.  These products have sealed surfaces
which will not dust easily.  Considerable energy is required
to cut, drill, or break these products.  Examples include:
          roofing shingles
          building boards
          drain pipes
     Finally, there is a group in which asbestos constitutes
a large percentage of the material.  Generally, the asbestos
fibers are loosely bound and the material does not possess
a predetermined shape.  Examples include:
     *    asbestos paper
     •    asbestos blanket or clothing
     •    asbestos rope, tape, yarn, and sealing compounds
     Emissions which are created during field fabrication of
asbestos containing materials will vary as to:  type of
material being fabricated; the amount of fabrication required
(cutting, sawing, sanding, etc.); the location and nature of
the fabrication site; and the quantity of material to be
fabricated.   The form that the asbestos is in will have an
obvious effect on emissions.   Free powdery materials or
materials in which the fibers are loosely bound will be more
prone to emission than those in tightly bonded composites.
                             41

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     Emissions during fabrication will vary according to the
amount of cutting, drilling, or sanding required.  To reduce
emissions, the various fabricating tools may be fitted with
attachments such that the dust created is arrested at the
source and collected in filter bags.  Commercial devices are
available.  Two examples of such devices are shown in
Figures 8 and 9.  The hoods work on the high velocity, low
volume principle and can be readily adapted to industrial
vacuum cleaner systems.
                             42

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Figure 8.  An electric portable saw with shroud for fitting to
                  exhaust •ventilation unit
   Figure 9.  A portable hand drill suitable for use with
                  exhaust ventilation units
                              43

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                          SECTION 5
                        SITE SURVEYS

INTRODUCTION
     The asbestos mines and mills operating in the United
States are listed in the accompanying Table 5.  All except
the Powhatton mine in North Carolina produce chrysotile
asbestos.  In total, the mines produce approximately 15%
of the asbestos used in the United States.  The remainder is
imported, mostly from  Canada.
     The largest single U.S. mine is the GAP mine located
in Vermont.  The ore is similar to that mined much more exten-
sevely in Canada and is an outcrop of the same massive ore
body.  The company claims that they will cease operating
in 1975 because it will not be economically feasible to meet
EPA emission limitations.
     California is the largest producer of asbestos by state.
The largest mine, the Pacific, produces the normal long
fibered form of chrysotile asbestos.  Three mines, the
Coalinga, Atlas, and Union Carbide, are in close proximity
to each other near Coalinga.  They work an ore body which
is 16 km (10 miles) long and 0.4 km (% mile) wide.  The
ore from these mines is atypical of asbestos.  Instead of a
fibrous vein structure, the asbestos is in a platy, slippery
form; it is-known locally as desert leather.
     The Union Carbide company trucks its ore 112 km (70
miles) to King City for milling.  They wet mill, a process
                             44

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                            Table 5,   THE  UNITED STATES  ASBESTOS MINES
Operating ]
Company i
GAP
Coalinga Asbestos Co.
Div. of Johns-Manville
Corp.
; Atlas Asbestos Corp.
Union Carbide
\ Pacific Asbestos Corp.
Powhatton Mining Co.
Jacquays Mining Corp . •
Asbestos Mfg. Co.
Metate Asbestos Co.
Location and Number of Employees '
Mine Employees
Hyde Park, Vt. 58
Coalinga, 20
Calif.

Coalinga, 20
Calif.
Coalinga, 36
Calif.
Copperopolis , 36
Calif.
Burnsville , 4
N.C,
Globe, Ariz. 8
Globe, Ariz.
Globe, Ariz.
Mill ; Employees ;
Hyde Park, Vt. 143 '
Coalinga, 50 :
Calif.

Coalinga, 50
Calif. ;
King City, 50
Calif.
Copperopolis, 135
Calif,
Baltimore, Md. 8 ;
Globe, Ariz. 5
Globe, Ariz.
Globe, Ariz. '
Approximate Weight !
of Asbestos ;
Produced per Day '
(metric tons) j
200*
100*

100
100
200* :
Operations
Suspended
10
Operations
Suspended *
Operations
Suspended
N.B.     1.  All mines open pit except those in Arizona, which are underground.
         2.  All produce chrysotile asbestos except Burnsville, N.C,,  which produces
             anthophyllite.

* Mines having the stated intention to close by the end of 1975.

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which is unique in the asbestos industry.  The other com-
panies, Atlas and Coalinga, built mills which were essentially
scaled down versions of normal asbestos mills.  They use air
aspiration to separate fibers from crushed rock.  The very
short fiber from these deposits is not really suited to
air aspiration methods.  The Union Carbide can wet mill
because water  is  plentiful  in  King  City;  water  is
scarce in Coalinga.
     Johns-Manvilie announced that they will be shutting
down their Coalinga asbestos mine and mill in 1974 because
it is not economically feasible to meet EPA emission control
requirements.  The Pacific Asbestos Corporation has also
announced the shutdown of their operations near Copperopolis
citing EPA restrictions as the reason.
     Arizona produces small quantities of an exceptionally
pure form of high quality chrysotile asbestos.  It is low
in iron and is suitable for electrical insulation and filter
manufacture.  Large quantities are exported to Japan.  Mining
is carried out underground, largely by casual, unskilled
Indian labor.  The ore is freed by drilling and explosion.
It is hand cobbed (beneficiated) using a hammer and the en-
riched ore is transported to the mill by truck.  Of the
three mines in the Globe area, only one, the Jacquays mine,
is currently in operation.  Another,  the Metate Asbestos
Company, has announced the redevelopment of their property
into a mobile home park.
     A small quantity of anthophyllite has been mined by
open pit methods in Burnsville,  North Carolina.  The ore is
trucked to Baltimore, Maryland,  where it is milled.  The
operation was closed down at the time of this survey.
Reportedly, the efforts to control emissions from this
operation were very limited.
                             46

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SURVEY LOCATIONS
     As part of this study, visits were made to three loca-
tions to observe the operation and the control techniques
used.  The GAP mine in Vermont was visited because it re-
presents the largest single mining and milling operation in
the United States.  The Coalinga mine of Johns-Manvilie was
visited because the chrysotile asbestos mined at that site
is a most unusual short fibered variety.  The Atlas and
Union Carbide operations, which mine the same type of asbes-
tos, were observed from outside their plant boundaries.  The
Pacific Asbestos Company denied a request for a visit.  The
facilities were viewed from outside the plant.  The Union
Carbide mill in King City, California, was surveyed because
it has the unique distinction  of utilizing a wet-mill
process for asbestos.
     A visit was planned to survey the Burnsville, North
Carolina, mine belonging to the Powhatton Mining Company.
This mine, although small, is unique to the United States in
that arithophyllite is mined.  The visit was not made because
the operation was shut down.
     The Globe, Arizona, operations were not visited formally
because: two of the three mines were closed.  The third,
although the largest of the three, is still very small and
the location is very remote.  It was not considered to be
worth the time and cost of a visit,  A member of the IITRI
staff who happened to pass the area while on vacation, photo-
graphed the exposed piles of ore and tailings at the mill
site.
                             47

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THE COALINGA ASBESTOS CO., INC., COALINGA, CALIFORNIA
     Date:  September 18, 1973
General
     The mine and mill is owned by the Johns-Manvilie organi-
zation.  It is managed by Mr. Keith Jones.  The postal ad-
dress is Coalinga Asbestos Co., Inc., P.O. Box 1045,
Coalinga, California  93210.  The telephone number is
209/935-0226.  Permission to visit the mine was arranged
through Mr. Ed Fenner, Director of Environmental Control,
and Mr. W. Van Derbeek, Vice President, both of Johns-Manville
at Greenwood Plaza, Denver, Colorado  80217.  Telephone
303/770-1000.
     The nearest  airport  to the mine is Fresno, California.
Coalinga lies 112 km  (70 miles) southwest on Route 198; its
population is 7,000.  The address of the company office is
505 West Elm Street on the southwest side of the town.  The
mine is located on private property 22.4 km (14 miles) to
the northwest of Coalinga.  From Coalinga, taken Derrick Road
north to Los Gatos Road.  The mine entrance is  on  the right
about 9.6 km (6 miles) from town.
     The asbestos deposits form an ore body which is 16 km
(10 miles long and 0.4 km (% mile) wide.  Three companies
presently work this deposit:  Coalinga Asbestos, Atlas, and
Union Carbide.  The mines are at an elevation of about 1,220 m
(4,000 ft).  Coalinga and Atlas have locally situated mills
at an elevation of about 914 m (3,000 ft).  Union Carbide
trucks its ore to King City, some 112 km away (70 miles).
Mining Operations
     The asbestos ore occurs at the surface and is very soft
and friable.  It is only necessary to bulldoze it out and
shovel it into trucks.  Blasting is carried out a few times
                             48

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a year to remove large boulders which obstruct mining opera-
tions.  An initial size classification step is carried out
at the mine by screening the ore through an unenclosed 10 cm
(4 in.) grizzle screen.  The ore is then transported to the
mill in 45,3 metric ton (50 short ton) trucks.
     Mining is carried out during the summer months, the mine
is closed from November to April.  During the summer, some
18,149 metric tons (20,000 short tons) are mined per day and
stock piled near the mill.  Snow is never a problem, but
heavy rains during the winter make the narrow winding roads
treacherously slippery.  Approximately 70 workers are
employed in the mining and milling operations.
Emission Control at the Mine
     There is no attempt to control emissions at the mine.
No sprinkling is undertaken, although it should be stated
that the ore has high water retention properties.  Fresh
ore is wet to the touch and contains 30% water.  Dried ore
at the surface is, however, quite dusty.
Mil1ing Operations
     The milling operation, opened in 1962, is a scaled down
version of the large mills in Canada.  The ore is repeatedly
crushed, fiberized, screened, and air aspirated.  Before
entering the screening system, the ore is coarse screened
on a 2.5 cm (1 in.) rotary trommel and then dried through a
rotary drier.
     The drying air is heated by fuel oil to 677  C
(1,250° F) and the exiting gases are 132° C (270° F).  The
dried ore is again screened through a 6 mm (% in.) mesh before
entering the milling process.  Fiber is collected by air
aspiration.  It is graded as a function of the fiber length,
which is a function of the amount of crushing to which the
                             49

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ore has been subjected.  All of the material which passes the
6 ram  (% in.) screen after the drier is marketable.  Even the
material collected in the baghouses can be used as a filler.
Pressure packing machines are used to fill both polyethylene
and paper bags with the product..
Emission Control at' the Mill
     Considerable efforts are exerted to reduce the emissions
of asbestos caused by the milling operations; however, there
is still a need for improvement.  The ore stock pile covers
an area approximately 100 m (90 yd) square.  A bulldozer is
employed to push the material forward and keep it level.
This operation creates a considerable dust cloud.  The pile
is not wetted by a sprinkler.  A dumper truck takes ore from
the stock pile to a hopper which feeds the conveyer and
rotary screen.  None of these operations are enclosed and the
ore is not watered-down.  The exhaust gases from the drier
are fed into a 4-cyclone system.  It is plainly inadequate
since considerable visible emissions are observed from the
stack.
     Inside the plant, efforts have been made to totally
enclose the screening, crushing, fiberizing, and conveying
systems.  These are largely effective, but there is still
considerable dust in the general plant environment.  Some
internal vacuum points are installed to help the housekeeping.
These are connected to the control exhaust system.  The
fiber bagging area is particularly dusty.  At this point,
fiber is emitted into the air.   No attempt is made to
isolate or enclose this dusty operation.  Air from both the
fiber aspiration system and from the enclosed units is fed
to a baghouse system of 9.9 x 10  1pm (35,000 cfm) capacity.
The exhaust system keeps the building under slight negative
pressure.   No emissions are visible from this unit.
                             50

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     Tailings are carried via a semi-enclosed  (hooded) con-
veyor to the tailings pile.  This pile is slowly filling the
V of a valley and extends for about 300 m (275 yd) and is
about 100 m  (90 yd) wide.  The material is dumped via an in-
verted funnel device.  However, the operation  is still very
dusty and large clouds of dust are observed.
     Efforts have recently been started to grow leguminous
plants on the tailings pile.  The results are  encouraging,
but they are merely test patches at this time.
Comments
     The mine and mill are both large sources  of emissions
at this time.  By visual inspection, the most  pressing prob-
lems are the mining operations, the roadways,  the ore dumps,
the drier emissions, and the tailings dump.  Even though the
emissions are obviously large, the mine and mill are in a
very remote  location.  Thus, the cost of control may be sub-
stantial and without a significant non-occupational exposure
health "benefit.  The transport of the emissions to centers
of population should be determined by a study.
Atlas and Unipn_C_arbid_e ppj3rationj3_
     In the  same local area as the Coalinga Company mine
are the mines of the Atlas and Union Carbide companies.
Their operations were viewed from the hills a*  short distance
away; entry was not made.
     Bo-;h of these companies mine and mill asbestos in quan-
tities comparable to the Coalinga Company.  That is, about
90.7 metric tons (100 short tons) of asbestos  are produced,
per day.  Mining techniques appeared to be essentially the
same.  The major difference was that the Union Carbide Mine
was very orderly, with regular tiers and layers.  The Atlas
Mill appeared to be very similar to the Coalinga Mill.
                             51

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Visible emissions were apparent from the drier exhaust stack
where a cyclone control  device is used.
THE PACIFIC ASBESTOS COMPANY, COPPEROPOLIS, CALIFORNIA
     Date:  September 19, 1973
General
     It was desirable to visit this mine for two reasons.
Firstly, it is unique among the California asbestos mines in
that it has the more usual form of long fibered chrysotile.
Secondly, it is in reasonable proximity to Coalinga and was
the only remaining large mine for which we had no information.
Because of the relatively short distance to the Copperopolis
location, it was decided to gain as much information as pos-
sible from the exterior,
Location Visit
     The mine and mill are located some 80 km (50 miles) east
of Stockton, California.  It is reached by taking Highway 4
for 64 km (40 miles) east from Stockton to Copperopolis.  At
Copperopolis, turn right, pass through the very small village,
and follow the road southeast for about 6,5 km (4 miles).
The mine entrance is on the left, a private road climbs into
the hills for about 4.8 km (3 miles) to the mine and mill.
     Viewed from the road, it is obvious that the mining
and milling operations are very similar to other locations.
The ore tailings piles and roadways are extensive and did
not appear to have emission control.  Similarly,   the trans-
portation by conveyors and trucks, and the dumping of asbes-
tos did not appear to be controlled.  At the time of the
visit, no visible emissions were seen from the mill, although
the mill could have been shut down at the time.
     Discussions with the Coalinga asbestos mill operators
suggest that the operation is standard in terms of emission
                             52

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control.  A baghouse has been placed on the air aspiration
system and a cyclone on the ore drier.
UNION CARBIDE MILL, KING CITY, CALIFORNIA
     Date:  November 14, 1973
General
     The mill is located off of Highway 101 near King City,
California.  To visit the mill, the nearest airport is San
Francisco.  King City is 280 km (175 miles) south of San
Francisco on Highway 107.  The mill is 8 km (5 miles) south
of King City on Highway 107 at the Wildhorse Road cut-off.
Pass under Highway 101 and turn right at the next junction
onto Cattleman Road.  Follow the road for about 1.6 km
(1 mile).  The mill entrance is on the left hand side.
     The nearest motel is the Sage Motel at 633 Broadway,
King City, California 93930.  Telephone 408/385-3274.
     The manager at the mill is Mr. Floyd Laresson.  The
telephone number is 408/385-5961.   The mill employs 66 to
70 persons.  The mill operates three shifts a day, seven
days a week.  About 8 to 10 mill operators are required per
shift.
Milling Operations
     On? is brought the 112 km (70 miles) from the Coalinga
area by truck.  It contains 15 to 207» water and 5 to 10%
magnetite.  Associated with the asbestos are varying amounts
of silica and serpentine rock.  About 145 metric tons (160
short tons) of ore are processed per day to yield 90.7 metric
tons (100 short tons) of asbestos.  An extensive ore stock
pile is maintained at the mill.
     Water is plentiful at the King City location.  It is
obtained from a well.  Approximately 90.7 metric tons
                             53

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(100 short tons) of water are used per day in the unique as-
bestos wet milling process.
     The ore arriving at the mill was graded at the mine by
passing it through a 12,5 mm (5 in.) grizzle.  At the start
of the milling process, the asbestos is slurried by spraying
with water as it passes over a 6 mm (% in.) screen.  The
fine fraction is then passed through a cyclone separator and
through a series of fiber opening and separation stages as
shown in Figure 10.  Magnetic separation is used to remove
iron oxides.
     The separated asbestos slurry is filtered through a large
filter press system containing six banks each about 9.1 m
(10 yd) long.  To remove the water, shriver filter presses
with 1.2 x 1.2 m (48 x 48 in.) plates operate at 5.5 x 105
   2
N/m  (80 psi) pressure.  The filtration step is expensive --
to replace the polypropylene filter costs $36,000 to
$38,000 per year.
     Filtered asbestos is then extruded through 12.5 mm (% in.)
orifices and passes into the drier.  A knife blade cuts off
the pellets at about 2.5 cm (1 in.) in length.  A rotary
drier with concurrent air flow is used to dry the pellets.
Exhaust gas is 132° C (270° F) versus 650° C (1,200° F) on
entry.   Pellets are then broken in mills to release the
fibers.  Asbestos is pressure packed in paper bags.  Bagging
machines are enclosed and the bagging room is isolated.
Bags are placed on pallets for shipping.
     Three grades of asbestos are produced, no attempt is
made to compare them to Canadian type grades.  Some is
shipped in pellet form.  For use in paper, titania is added.
For use in mining,  aluminum silicate is added.  High purity
material is obtained by giving a double magnetic separation.
The short fibered asbestos has many uses.   Chief among these
                             54

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                                  UNDERFLOW
  WET  PARALLEL
  PLATE GRINDER
       I
   DUTCH  SCREEN
      MESH
VIBRATING  SCREEN
GRAVITY SEPARATOR
1
f
TAILINGS

\

ASBESTOS
FILTERED OFF
                                     DUTCH SCREEN
                                         MESH
                                    VIBRATING  SCREEN
                                   GRAVITY SEPARATOR
        Figure 10.  Flow sheet for asbestos
                 wet-milling process

f
ASBESTOS
FILTERED OFF

%
TAII
                         55

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is its use as a filler/strengthener in floor tile.  It is
also used in paper, ceiling tile, as a filler in thixotropic
resins, and as a lubricant in oil well drilling.  Japan is
the mill's largest customer.
Emission Control
     It is immediately apparent, from observing the mine
with its neat terracing and shelving and from the orderly
mill appearance, that the Union Carbide operation is a well
organized business.
     Emissions from the ore pile are kept to a minimum by
spraying with water.  This activity is not costly since water
is plentiful and the ore will be slurried eventually any-
way.  This is in contrast to the dry air aspiration processes
where the addition of water adds a costly burden to the con-
ventional first step, that is, ore drying.
     Conditions inside the mill are strikingly cleaner than
other asbestos mills or processing plants.  No dust to be
seen anywhere except in the bagging room.  The bagging of
asbestos is undertaken in enclosed, air-swept booths in an
isolated room.  The external surfaces of the bags are air-
swept to remove most of the loosely adhering fibers.  Air
from the bagging enclosure is exhausted through a baghouse
system.
     Air from the ore dryer and from the bagging plant is
exhausted through baghouses.  Two baghouses of 2.83 x 10
1pm (10,000 cfm) and 5.4 x 105 1pm (19,000 cfm) capacity are
used.   Since the air from the driers is hot (about 125° C,
257  F), and contains moisture, insulated baghouses are
used to avoid condensation as the gases cool.   The bags are
made from Nomex to withstand the high temperatures.  The
units are of the pulse-air cleaning type and were made by
Industrial Filtration, Inc.
                             56

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     Another feature which is unusual, If not unique, among
asbestos companies of the United States, is Union Carbide's
current program of building changing rooms with lockers and
showers,  Workers leaving asbestos plants with asbestos ad-
hering to their clothing constitute an individual, unenclosed,
asbestos emission source which could constitute a threat to
the person's immediate family.  It is hoped that the company
will require workers to have a complete change of clothing
before leaving the plant.
     Tailings from the plant are carried in a very wet state
to a tailings dump.  As the tailings dry, they will become
subject to erosion and constitute an emission source.  There
is no program at present to stabilize this emission source.
     Waste water from the plant Is considerable In quantity.
At the time of the survey, the company was negotiating with
local pollution authorities for permission to continue to
dump this waste water into the sewer system.
     The use of paper bags as containers for the asbestos
product creates two problems which are of concern to the
Union Carbide management.  One is that they split and allow
fibers to spill out.  The other is that asbestos fibers cling
and cake onto the paper and are subsequently causing emissions
Plastic bags would be superior because they are tougher and
the smooth surface would be more easily blown clean.  Paper
bags persist because customers specify their use to reduce
costs.
THE GAF ASBESTOS MINE AND MILL, EDEN MILLS, YERMONT
     Date:   October 10, 1973
General
     The GAF Corporation asbestos mine and mill is located
in Vermont,   The nearest airport is Burlington.  From Morris-
ville follow Route 100 north for about 24 km (15 miles) to
                             57

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Eden Mills.  From the center of this very small community,
a secondary road winds northwest; the plant is located on
the left side about one mile up this road.  The nearest motel
is the Sunset Motel in Morrisville, telephone 802/888-4956.
     The manager of the plant is Mr. Ronald K. White; the
telephone number is 802/635-2311.  The plant has a staff of
about 200.  About 60 workers are engaged in the mining
operations and about 140 in milling.  The mill is operated
three shifts a day, six days per week.  Approximately 136
metric tons (150 short tons) of ore are handled per hour.
Mining_ Operations
     The ore is mined on the Belvidere Mountains in Orleans
County, Vermont.  The deposit is an outcrop of the extensive
deposits which are mined in Canada some 160 km (100 miles)
across the border.  The area is sparsely populated.
     The ore is removed from a terraced open-pit mine on
the mountain side.  A series of blast holes are drilled
along the edge of a terrace using Ingersoll Rand or Reich
drills.  The drills are fitted with cyclone dust collectors;
some emissions are created.  Primary blasting is carried
out every 8 to 10 days to free large sections of rock.
Secondary blasting to break-up large boulders is undertaken
every day.  The rock has a moisture content of between 1 and
15%.   Water could be seen seeping through the mine face and
forming large puddles on the pit-floor.
     The rock is lifted by mechanical shovel into 31,8 metric
ton (35 short tons) trucks and is carried to a storage pile
near the rock crushing unit.  The roadways In the mine area
are covered with 12.5 mm to 25 mm (% in. to 1 in.) rock
chips obtained from the ore crusher..
                             58

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Emission Control at the Mine
     Little or no attempt is made to reduce the emissions
from the mining operations.  The drills are equipped with
cyclones but they are of limited effectiveness.  Blasting,
shovelling, hauling, and dumping are all uncontrolled.  The
roadways are made from rock chips and are dusty when traversed.
Some oil spraying has been undertaken and was reported to
reduce the dust emissions.  The ore is dumped into a covered
jaw crusher, but it is not enclosed nor is it vented through
a control device.
Mil1ing Operat ion s
     Milling is undertaken in a four story building built in
1948.  The asbestos is extracted by the normal asbestos
industry method of repetitive crushing and air aspirating off
the released fibers.
     Ore from the mine is crushed by a large 149 KW (200 HP)
jaw crusher; this breaks the rock into 16.2 cm (6 in.) pieces.
It is then reduced to 2.5 cm (1 in.) pieces using an
eccentric crusher.  The crushed wet rock is stored prior to
the drying stage; 68,058 metric tons (75,000 short tons) of
wet ore are stored at this point.  The crushed ore is then
passed through a rotating drier.  Hot air enters the drier
at 900° C (1,700° F) and exits at 70° C (150° F).  Dried
ore is then stored in hoppers ready for the fiber extraction
process.
     The extraction process follows a complex route through
the mill floors starting from the top.   It is a dusty pro-
cess.  The ore is carried by gravity and a series of open
conveyors.  Extracted fiber is carried by an air stream to
the various collection points.   Seven asbestos grades, from
long spinning quality to short filler material, are collected.
Fiber is pressure packed into paper or plastic bags.  The
bags are then palletized before shipment.
                             59

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     Waste rock material tailings and waste material from
the baghouses are carried by a long conveyor belt system to
the tailings pile.  The tailings piles are extremely large
                     2
and cover some 0.2 km  (50 acres) of ground.  The height of
the pile is difficult to estimate because of the uneven
terrain; however, it is about 152 m (500 ft) at its highest
point.
     The conveyor system is actually a series of ten separate
conveyors; each is enclosed.  At the meeting point of the
conveyors, there is a motor house which is vented without
control, creating visible emissions.  Emissions are created
as the tailings tumble from one conveyor to the next.  Since
men enter the conveyor houses for maintenance and the control
of the system, the houses are ventilated.  The vented air is
an obvious and visible source of emissions from each house.
     The tailings are discharged onto the top of the tailings
pile.  A bulldozer is used to distribute the tailings on
the top surface.  The bulldozer is also used to relocate the
end of the conveyor discharge.  Each of these operations
creates emissions.
Emission Control_at _the__Mi 11
     The GAF mill is currently operating under a EPA, NESHAP's
waiver, which extends until March 15,  1975,  The company has
stated that the required controls are too expensive and that
they will be forced to close their plant.  In order to comply
with EPA requirements, they will be obliged to fit baghouse
emission control units at the following emission points71 .
     A.   Primary crushing building ventilation air stream
          that has a flow rate of 1.42 x 1Q5 1pm (5,000 cfm).
     B.   Secondary crushing building ventilation air stream
          that has a flow rate of 1.42 x 105 1pm (5,000 cfm).
                             60

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     C.   Two conveyor transfer points, each with ventilation
          volumes of approximately 8.5 x 10^ 1pm (3,000 cfm) .
     D.   Two asbestos ore dryers, each with a flow rate of
          7.1 x 105 1pm  (24,000 cfm).
     E.   Tertiary crushing with a flow rate of 7.1 x 10  1pm
          (25,000 cfm).
     F.   Dry dock storage ventilation gas stream, with an
          approximate flow rate of 5.66 x 10* 1pm (20,000 cfm),
     G,   Twelve tailings conveyor transfer points ventila-
          tion air streams, each with  a flow of approximately
          8.5 x 104 1pm  (3,000 cfm).
     Ocher emission sources which are not controlled by the
NESHAP standard are: 1)  the discharge of wet rock and the
tailings from the conveyor onto the piles, 2)  mechanical
movement of wet rock and tailings for distribution on the
piles, 3) vehicle traffic  on the mill site, and 4) wind
blown emissions from storage and tailings piles.
     The air used for aspiration of the fibers and for ven-
tilating the mill is currently passed through two baghouse
filters of 8.5 x 106 1pm (300,000 cfm) and 2.1 x 106 1pm
(75,000 cfm) capacity.  The larger unit is the more conven-
tional type with the fan on the exhaust side.  The smaller
unit is a pressure type and the fan is on the inlet side.
During the winter months, air is recirculated within the
plant to conserve heat.  Since the inside of the plant is
noticeably dusty, this would mean that air emerging from
the plant; via windows and doors would in all probability be
less clean than that from a baghouse stack emitting directly
to the ambient air.
     The air from the ore dryer is currently passed through
two clusters of four high-efficiency cyclones.  GAF are of
the opinion that baghouses cannot function with hot, wet gases
when the ambient temperatures are very low as during the win-
ter months in Vermont.  This is because of dew-point
                             61

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condensation causing plugging.  However, this problem has
been eliminated by heavy insulation at the Johns-Manvilie
plant in Asbestos, Canada.
     It was noted that, despite the age and established na-
ture of the tailings dump, there is no  vegetation cover.
The huge piles are a dull grey color.
THE CERTAIN-TEED AND NICOLET WASTE DUMPS, AMBLER,
PENNSYLVANIA
     Date:  August 30, 1973
     Survey reported by A. Lee and S.L. Roy of the Environ-
mental Standards Enforcement Division  (ESED) of the EPA.
General
     The Certain-Teed and Nicolet companies process asbestos
materials at two sites located approximately 24 km (15 miles)
northwest of Philadelphia, Pennsylvania.  The Certain-Teed
plant is located approximately 400 m (1,200 ft) southeast of
the Nicolet plant.  The nearest motel is the Sheraton Motor
Inn at the Fort Washington Interchange on the Pennsylvania
Turnpike.  Nicolet produces monolithic board and gasket
material while Certain-Teed produces asbestos cement. pi.pe.
Their waste dumps are located next to each other.
P1ant Descriptions
     The draft of the ESED survey reports that the Nicolet
Industries' operation in Ambler, Pennsylvania currently is
at two locations.  Plant No. 1 is the main plant and produces
high-density and low-density monolithic board and gasket
material that contain commercial asbestos.   Several other
asbestos-containing products are produced on a smaller scale
at the plant.   The monolithic board is sent to Nicolet Plant
No. 2,  located several blocks away, for grinding, sanding,
polishing, and sizing.  The dust that is generated during the
                             62

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finishing operation at Plant No. 2 is collected in hoppers
and is transported once a day  (at approximately 6:15 a.m.)
to Plant No 1's waste-water settling pond.  The material in
the hopper is reportedly wetted down and covered to eliminate
wind blown emissions during transport.  The transfer and
dumping operation was not observed by the ESED, because it
had occurred prior to the visit.  The grayish-black, asbestos-
containing dust is dumped into one of three settling ponds
and mixed with water emanating from the large board and
gasket presses at Plant No. 1.  The settled sludge from the
three primary settling ponds is pumped to a large lagoon,
the overflow from the settling ponds is pumped to a large
lagoon, the overflow from the settling ponds passes through
a series of settling ponds and porous filtering beds prior
to being discharged into a stream.
     Empty bags that contained commercial asbestos and other
solid waste materials generated at both Nicolet plants were
reportedly collected and removed from the plant sites by a
private contractor.  The ultimate disposal of these wastes
is not known.
     The report further states that the Certain-Teed plant
produces asbestos cement pipe as its major product.  Liquid
and solid wastes from the manufacturing operation are
slurried and transported to a settling and dewatering lagoon
by tank trucks,
Inactive Disposal Sites
     A waste disposal site, described in the ESED draft, was
located southwest of the Nicolet Plant No. 1.  This site has
been inactive for about four years.  The type of waste
material deposited at this site is described as very different
than the material currently being disposed of at the active
Nicolet site.
                             63

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     Large pieces of solid waste materials were observed by
the site team on this inactive site, which covers approxi-
               2
mately 40,000 m  (10 acres).  Trees, grass, shrubs, and weeds
reportedly covered approximately 75 to 90% of the surface
area of this inactive pile.  No vegetation was observed to
be growing on the north bank of the pile.  This bank was
described as being approximately 183 m (200 yd) long and
approximately 15 m (50 ft) high, with a slope of about 60
degrees.  The white barren bank of the waste pile was said
to completely border one side of a playground and was very
close, within 15 m (50 ft), to an occupied dwelling.  At
the time the inactive waste disposal site was visited by the
ESED, no children were playing on the pile; however, chil-
dren were playing in the playground near the pile.  A member
of the site team, in a discussion with a local resident,
reported that visible dust emissions do not generally occur
from the pile.  The surface of the barren bank of the dis-
posal pile was described as granular in nature; however, the
granules could be broken into a dusty material if strong
pressure were applied.
     Another older inactive asbestos waste disposal site,
located close to Nicolet Plant No. 2, was observed by the
site team to be completely covered with trees, grass, and
weeds.  This particular site was generated by an asbestos-
using industry which is no  longer in operation.  The ESED
report states that it is unlikely that major asbestos emis-
sions would occur from this inactive site.
Acti veD i s po s a1 S iteg
     The presently active disposal sites of the Nicolet and
Certain-Teed plants were reported to be adjoining one another.
The Nicolet site is described as approximately 18 m (60 ft)
high and the Certain-Teed site is approximately 6.1. m (20 ft)
high.   The Nicolet site is reported to be the older site and
                             64

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currently growing at a slower rate than the Certain-Teed site,
The slurried waste settling and dewatering lagoons for the
Nicolet and Certain-Teed plants were reported to be separated
by approximately 91 m (100 ft).
     The Nicolet waste disposal area, where the slurry is
pumped, is described as approximately 91 m (300 ft) wide by
152 m  (500 ft) long.  The waste pile is stated to be approxi-
mately 18 m (60 ft) higher in elevation than the main plant
level and approximately 64 m  (210 ft) away from the main
plant.  The top layer of the dewatering lagoon is described
as dry and crusted over with many cracks in this surface
layer.  This top layer is reported to be light in color,
having a low density, and fibrous.  The ESED report states
that these fibers appeared to be bound securely enough so that
they would not be released by the wind.  The sides of the
disposal site are described as about 46 cm (1.5 ft) higher
than the level of the lagoon and form a roadway approximately
4.6 m  (15 ft) wide.  Solid material is deposited and spread
on this roadway when it becomes necessary to build up the
sides of the pond.  Reportedly, the material used to build
the roadway does not contain asbestos.  Rocks removed from
the rock bed filters and other solid material are used for
this purpose.  The report cites the possibility for some
wind blown emissions to occur from the roadway and the banks
of this waste disposal site.
     The Certain-Teed waste disposal site is reported to be
similar to the Nicolet site; however, the waste slurry is
transported to the lagoon in tank trucks instead of being
pumped.  Each truck carries approximately 26,400 liters
(6,000 gal) per load and empties into the lagoon at a rate
of about 10-12 truckloads per six-week period.  When the
lagoon is filled (approximately every six weeks), the
dewatersd sludge is dredged out of the lagoon and dumped on
                             65

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the solid waste area where it is subsequently mixed by a
bulldozer with crushed, discarded, asbestos-concrete pipe
to stabilize the disposal pile.  The lagoon dredging operation
was observed during the ESED visit and did not generate
visible emissions.  The bulldozer could possibly generate
visible emissions when crushing the pipe and mixing it with
dewatered sludge, but this operation was not observed by the
site team.  The solid waste area was described as being well
compacted; however, some dust was created by a dump truck
moving dredged sludge.  The report states that is is possible
for wind blown emissions to occur from this area.  The
material on the surface reportedly appeared to fibrous in
nature, but the fibers appeared to be securely bound to
larger material.
                             66

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                          SECTION 6
            FIELD TESTING FOR ASBESTOS EMISSIONS

GENERAL SAMPLING SCHEME
     Field sampling was undertaken to obtain preliminary
information on the extent of the emissions from asbestos mines
and waste dumps.  Although actual conditions at a given
sampling site necessitated changes, the following general
plan was formulated.
     A system of six Hi-Vol ambient air samplers was employed
to sample the emission source.  The samplers were positioned
in pairs along the line of the wind during the sampling period.
A mechanical weather station was placed on the emission
source near the most active region.  The weather station
recorded the wind speed, wind direction, and air temperature.
One pair of Hi-Vol samplers was situated approximately 400 m
(% mile)  upwind  of  the weather  station.   The  other two
pairs of Hi-Vol samplers were positioned downwind at approxi-
mately 400 m (% mile) and 2 km (1% mile).  The use of two
Hi-Vol samplers at each sampling location enabled simultaneous
sampling to be carried out at elevations of 2 m (6 ft) and
7 m (20 ft).   The sampling elevation of 2 m  (6 ft) was chosen
because it is near the human breathing zone and yet high
enough to minimize filter contamination from surface soil and
plant parts.   The latter could be caused by disruption of
the soil and vegetation by the Hi-Vol sampler's exhaust.
The elesvated sampler was at a height of 7 m  (20 ft) .
Physical limitations in erecting the Hi-Vol sampler dictated
                             67

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this elevation.  A sampling height of 10 m (30 ft), the stan-
dard height for measuring surface winds according to the
World Meteorological Organization and the National Oceanic
and Atmospheric Administration, was the preferred elevation.
For consistency, the weather station was erected to the same
7 m (20 ft) elevation.  A schematic diagram of the sampling
site is shown in Figure 11.
     The ambient air samples were collected on Millipore
filters of 0.8 ym pore size.  The sampling times ranged
from % to 4 hours in length, depending on the site conditions.
The Hi-Vol samplers used were manufactured by B.G.I., Inc.
The samplers used at the 7 m (20 ft) were the universal model
equipped with Bendix 20.3 cm x 25.4 cm (8 in. x 10 in.)
filter heads.  The 2 m (6 ft) samplers were the Type I model
without the rain hood.  The samplers have rotometers attached
to indicate flow rate.  The rotometers were calibrated in
the laboratory using the Bendix Hi-Vol calibrator and a
Dwyer manometer.  The total volumetric flow was the average
of the initial and final flow rates times the sampling time.
In the present study the very low dust loading resulted in
virtually no change in pressure drop across the filter; thus,
the initial and final flow rates were identical.
     The mechanical weather station was manufactured by
Meteorological Research Instruments, Inc., model 1076.  Three
Sears 1,500 Watt, gas-powered alternators were used to supply
electric power for the samplers.
FIELD SAMPLING -- COALINGA, CALIFORNIA
     The site sampled at Coalinga, California, was an asbestos
ore processing mill owned by the Coalinga Asbestos Corporation,
a Division of the Johns-Manville Corporation.  The mill and
mine are located on private property 22.4 km (14 miles)
northwest of Coalinga.  The mill is situated in the hills at
an elevation of 909 m (3,000 ft).  The mine itself is higher
                             68

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                        WEATHER STATION
                    SOURCE
       % MILE
% MILE
1 MILE
       0.4 km
0,4 km
1.6 km
WIND DIRECTION
     GROUND SAMPLER
                      ELEVATED SAMPLER
              Figure 11.   Schematic diagram of sampling strategy

-------
into the hills about 1.6 km  (1 mile) away at an elevation of
1,212 m  (4,000 ft).
     Field sampling began on November 15, 1973, with the
selection of sampling locations.  Towers to accommodate the
samplers at the 7 m (20 ft) elevation were erected.  Figure 12
shows the relative sampling locations.  The downwind loca-
tion, No. 3, was not in direct line with the other locations
and the wind direction because the hilly terrain made this
impossible if the same altitude was to be maintained.
     The onset of heavy rain and the temporary shut-down of
the milling operations limited the number of samples that
were taken.  Ambient air samples were taken between rain
showers only at the 2 m (6 ft) elevation.  Two samples were
taken at each of the three sampling locations.  Sampling  -
times were 30 minutes and one hour.  Conditions at the mill
site were very wet.  Only those tailings which were actually
being dumped were in a dry, dusty state.  Effectively, all
other emission sources could be considered controlled.  The
wind during the sampling period was blowing from the south
down the valley at a velocity of 6.26 m/sec (14 mph).  The
ambient air temperature was 6.1  C (41  F).
FIELD SAMPLING -- WAUKEGAN, ILLINOIS
     The Johns-Manvilie Asbestos-Products Manufacturing plant
                                            2
at Waukegan, Illinois, is located on 0,35 km  (87 acres)
of Lake Michigan shoreline.  The waste dump itself covers
                  2
only about 8,000 m  (2 acres).  It is rectangular in shape,
approximately 150 m by 450 m (165 yd by 495 yd).   The dump
rises to a height of 9.14 m (30 ft) above the general level
of the plant site.  The northeast corner of the dump is the
most active face.
     The dump contains waste in which the asbestos is both
tightly and loosely bound.  Waste from asbestos-cement,
                             70

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         ORE
         PILE





PLANT
SITE

# STATION NO. 1

\


COVERED /-'"7 --•-'
CONVEYOR c
Oil TAILINGS
TRANSPORT

x"
MECHANICAL • £--
WEATHER
STATION

w
^A 1
\ !S

\ W
\ H
\
ra \STATION
-^ A NO. 2
V 	
j- ^

N
NK








-, ^_____ TAILINGS EXIT SPOUT


        STATION NO. 3
                                      SCALE
                                        0	~~5U~   pO    150 m
                                        b—ifeo sibo 3oo 4ou bdo ft
Figure 12.  Schematic layout and sampler locations;
               Coalinga, California


                             71

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friction materials and floor tile operations has asbestos
fiber held in a strong matrix.  The material itself is not
easily broken apart.  Waste from asbestos-paper and building-
board manufacturing operations is more friable and the as-
bestos fiber is less securely bound to the product.  The
asbestos waste from the settling ponds and from the baghouse
collectors is loose and has the greatest potential for be-
coming airborne.
     The operation at the dump is continuous from 7:30 a.m.
to 3:30 p.m.; occasionally a dump truck adds waste during the
evening shifts.  The waste is added to the active face from
the top of the dump.  Asbestos-cement pipe is broken and the
waste is compressed by a 54.4 metric ton (60 short ton)
bulldozer.  The top surface of the dump is covered with top
soil and vegetative stabilization is being attempted on the
inactive south face of the dump.
     Field sampling was started on December 3, 1973,  Snow,
rain, and freezing temperatures delayed sampling; however,
the preliminary work was completed.  Samplers were erected
at elevations of 2 m (6 ft) and 7 m (20 ft).   Because the
wind was blowing across the dump onto Lake Michigan, only
one downwind sampling location was possible.   Samples were
also taken next to the weather station on top of the dump
(sampling location No, 2).  Figure 13 shows the relative posi-
tion of the sampling stations.
     The ambient air samples were collected on December 8,
1973, with a minimum sampling period of three hours.  At the
time of sampling,  the surface of the pile was frozen.  This
meant that emissions from the dump were effectively controlled.
The wind on December 8th was blowing from the south to south-
west (180  to 225 ) with velocities varying from 4.47 to
6.70 m/sec (10 to 15 mph).  The ambient air temperature was
0° C (32° F)  at noon, decreasing to -1.1° C (30° F) by 4:00 p.m.
                             72

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N
                                                                                          DITCH

                                                                                           =s?/»r

MAGNESIA &
RAGFELT

i
WAREHOUSE
        FRICTION

        MATERIAL
 WAREHOl SE
        SCALE
                                                   STATION NO. 1
           u
            i  i
"—	TOO m

*400 ft        Figure 13.   Map of Waukegan,  Illinois
                                                                                                  w
                                                                                                  >
                                                                                                  3
                                                                                                  O

                                                                                                  w
                                                                                                  M
                                                                                                  >
                                                                                                  n
                                                                                                  a:
                                                                                                      Q
                                        site and sampler locations

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 FIELD  SAMPLING --  DENISON,  TEXAS
     The  Johns-Manvilie Asbestos-Cement  Processing  plant
 at  Denison,  Texas,  is  located  on  level terrain near the Red
 River.  Waste  material consisting of  crushed  fragments of
 asbestos-cement pipe in which  the asbestos  is locked in a
 durable cement structure  and waste materials  collected in  the
 baghouse  hoppers are deposited on this dump.  In  addition,
 sludge from  the asbestos-cement processing  water  settling
 pond is placed onto the dump.   Waste  material is  sporadically
 and inefficiently  water sprayed to reduce emissions.  When
 a sufficiently large area is buried and  distributed,  it is
 earth  covered.   The dump  is irregular in shape, but can
                                                  2
 best be approximated by a square  covering 0.044 km   (11 acres)
 The different  sampling times were used to insure  at least  one
 set of samples with a  fiber density suitable  for  inspection
 by  both optical and electron microscopy.
     On February 27th, the  wind was gusty,  averaging 8.94
 m/sec  (20 mph),  blowing from the  south (165°  to 195°).
 The ambient  air  showed a warming  trend; being 12.2°  C (54° F)
 at  the start of  the sampling period,  and rising to  16.7° C
 (62  F) four hours  later.   On  the  second sampling day,
 February  28th,  the wind was steady at 4.92 m/sec  (11 mph)
 and from  the south  to  south-southeast (150° to 180°).  The
 ambient air  temperature was stable at 17.2° C (63° F).
 ANALYSIS  OF  SAMPLES
 Optical Microscope  Instrumentation
     A Zeiss Universal Research microscope and a Leitz
 Ortholux microscope were used  for optical counting and sizing
 airborne  fibers.  They were both fitted with phase-contrast
 optics.  The size of the field of view was measured using
 a stage micrometer.  The objective lens on both microscopes
were 4 mm.  The field of view on the Zeiss was 9.62 x 10   cm
                              74

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                Figure  14.   Map of .lolma-Manvllle  site,  Denison, Texas
              ] Mil.I-  -  AlTRilXTMATK ONLY
            !  Kl I.OMKTKK
HIND D'RMTION
] .   FEIKUAKT  27T1I
2.   FEBRUARY  28TM

-------
at a total magnification of 650X,  The Leitz had a field of
view of 6.51 x 10   cm  at a total magnification of 500X.
All particles having a 3:1 aspect ratio were counted.  The
minimum particle diameter counted was 0.5 ytn.
Sample Preparation for Op tical Counting
     Samples were prepared for optical counting in the
following manner.  All operations were carried out in a Farr
clean bench.  A triangular section, about one square centime-
ter in area, was removed from the central region of the fil-
ter using a scalpel and tweezers.  This section was then
placed, particle side up, onto one or two drops of mounting
fluid on a glass slide.  The mounting medium was a 1:1 solu-
tion of dimethyl phthalate and diethyl oxalate.  The refrac-
tive index of this medium is 1.47.  The filter was allowed
to clear for 15 to 30 minutes.  A clean cover slip was then
placed over the filter.  The prepared samples were counted
within 24 hours of preparation (usually less than 6 hours).
Electron Microscope Analysis
     The electron microscope used was a Hitachi HU-11 trans-
mission electron microscope.  This instrument was calibrated
using standard grids.  The magnification to the photographic
plate was 18.000X.  However, the counting was done on an
optical viewing screen.  A factor of 1.1 relates the photo-
graphic plate and the optical viewing screen.  Therefore,
the effective magnification was 16.364X.  The measured field
                     -7   2
of view was 1.34 x 10   cm ,  Fibers as small as 0.020 ym
in diameter could be measured at this magnification.
     It was originally planned to use a scanning electron
microscope and interrogate the image using a Quantimet 720
image analyzer.  However, it became obvious after a prelim-
inary series of experiments that this was not a practical
method.  The JEOL 50A SEM with a theoretical resolution limit
                             76

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of 100 £ could not resolve the finest asbestos fibers of
200 £ diameter.  In addition, the present electronics on the
IITRI Quantimet 720 are not capable of distinguishing the
small fibers from the background because of the low contrast
levels between the fibers and the background.  A further
point was that the instrument could not evaluate the fibers
when they were present as bundles;  when two fibers touched
or crossed; when   a   fiber was close to other particles;
or when the fiber was very long and curved or looped.
Sample Preparation for Electron Microscope
     To prepare a sample for electron microscope examination,
a circle of 3.5 mm in diameter was  cut from the center of
the filter using a punch.  This piece of filter was placed
dust side up on a 100 mesh carbon-coated electron microscope
grid.  It was then placed in a "cold finger" condensation
washer using acetone as a solvent.   The acetone vapor washed
away the filter media, depositing the collected particles
onto the carbon substrate of the grid.  The specimens remained
in the condensation washer overnight to insure total dissolu-
tion of the filter media.
Criteria forCounting
     In order to obtain an accurate estimate of the number
of fibers, the statistical error resulting from the random
distribution of fibers must be kept to an acceptably low
level.  The NIOSH criteria document on asbestos (HSM 72-10267)
states that fiber counts follow a Poisson distribution.  In
this study, it was assumed that all fibers counted, whether
by optical or electron microscope,  followed Poisson statis-
tics.
     Based on a count of 100 fibers,  the error at the 95%
level of confidence would be two standard deviations.  That
is, 2 x /TOTF,  or ± 20.  Therefore,  a quoted value of 100
                             77

-------
fibers should be accurate to within 80 to 120 fibers.  The
loading of particles on the filter determines the number of
fields which need to be examined to count 100 fibers.  In
general, a minimum of 20 fields and a maximum of 100 fields
were examined.
Calculation of Ambient Air Fibers Concentration
     A field of view of the microscope is a small portion
of the specimen.  In order to relate the number of fibers
counted to the ambient air fiber concentration, the following
formula was used.
                                                   3
Ambient Air Fiber Concentration (number of fibers/m  of air)
 _ fnumber of fibers counted]
   [number of fieldscountedj
                                          ?
                 effective filter area (cm )       1
          [area of microscope's field of view (cm )
                                              I
                              x
                                (volume of air sampled (in
Results of the Analysis of Field Samples
     The field samples were analyzed using both the electron
microscope and the optical microscope.  The samples were
counted to determine the ambient air concentration of fibers
and the size distribution by length of the fibers.  No
positive identification of the fibers as asbestos was made.
Rather, it was presumed that the sampling locations provided
apriori evidence that the fibers originated from the sites
being sampled.  The results of these analyses are summarized
in,- 1) Table 6 for the samples collected at Coalinga,
California; 2) Table 7 for the samples collected at Waukegan,
Illinois; and 3) Tables 8 and 9 for the samples collected
at Denison, Texas.
                             78

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                                 Table 6.  SAMPLING DATA AND AMBIENT AIR CONCENTRATIONS  OF FIBERS  IN THE VICINITY OF THE
                                            •JOHSb-Il&sVXliLE ASBESTOS MILL TAUjXtJCS  I*TLE;  COAl_,Ii^GA,  CAX.ZFOKI'y 1A
November 19,  1973
Weather Data  during Sampling Period:  Wind, 6,26 m/sec (14 oph) from the South; Temperature, 6.1°C  (41°F)
Fiber Concentration and Size Distribution by Fiber Concentracion and Size Distribution by i
Sampling Data I" IT



Site
lumber
1
1
2

2

3
3
: Approximate Sampling1
Location with Volume
Sampling 'i Respect to Active ; of Air
Elevation, Face of Tailings
a Pile, m (ft)
2 330 (1QS2) upwind
2
330 (1082) upwind
2 3 (10) at last con-
veyer transfer
2 3 (10) at last con-

2
2
Sampled,
Hi-*
30.8
56.2
26.7

44.8
veyer transfer
Total Ko .
of Fibers
per tn
0.75 x 105
0.86 x 105
7.39 x 105

9.51 x 1C5

224 (736) downKind | 13.6 |9.3l x 105
224 (736) downwind j 56.1 (7.31 x 105
Optical Microscopy [

Size Distribution of
2.41 Election Microscopy [3,4] '
Size Di tribution of Fibets by Length as
Fibers by Length a Per entage of the Total Number of !
as a Percentage of the Total Number oE Total No. Fibers
Fibers of Fibers 0.048- 0.061-
l.i-9.9 I'm, 10-19.9 urn
76 , 17
75 14
74 16

68 24

77 17
76 17
20-29.9 junli30 pm, per mj 0.06 ^m 0.18 urn
6 2 a. 54 K 108 35 60
7 ; 4 ,
7 i 3 ^1.58 x ID8 19 40
r
7 2 : - -
* i
4 2 '5.93 x 108| 38 41
5 2 ! - ! -
;
0.181-
0.36 urn
6
-
26

-

12
-
0.361-
0.54 urn
1
-
15

-

6
-
0.541- i
1.49 um{
0
1
o !

;

4 •
i
Samples were  collected on 20,3 cm x 25.4 cm (8 in x 10 in) Miiiipore filters.  The  pore  size was  0,8  (xm and the effective filter area was 425.4 cm ,


[1]  Figure 12  is  a location plot of the sampler locations at the sampling site.

[2]  Phase contrast optics and a 4 mm objective lens were used for optical counting.  The  total magnification was 625X,  The mitiiiouts fiber diameter
     includsct in the counts was estimated at 0,5 jj.ni*

[3]  Electron microscopy counting and sizing were done at a magnification of  16.364X.  Fibers  with a  diameter as small as 0.016 ^m were counted.

[4]  Particles  having at* aspect ratio greater tlian 3:1 and approximately parallel sides  were considered fibers.

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                                Table 7,  SAMPLI^J DATA AND AMBIENT AIR CONCENTRATIONS OF FIBERS IN THE VICINITY OF Tffi
                                                     JOHNS -MANVILLE WASTE DUHP; WAUKEGAN, ILLINOIS
Decesfcer 8( 1973
                                                                              Che  South  to  Southwest  (180°-2250); Temperature, 0.0'C (32T) at
Fiber Concentfation and Sise Distribution by
Sampling Data [ 13
^ ^

1 Samplitig
Si.tG lElcsvflt I.OH t
Approximate Sampling
Location 
1 ! 2 J336 (1200) upwind j 116.7 ;0,3S x 1C2
1 7
2 2
336 (1200) upwind j 97.3 '3.15 x 1C2
Optical Microscopy [2, 41
Fiber Concentration and
Electron Mier
Size Distribution by
5scot>y [3,41

*Size Distribution of Fibers by Length as
Size Distribution of Fibers by Length
as a Percentage of the Total Number of
Fibers f5]
1.5-9.9 jitn' 10-19.9 ^m 26-29.9 (j-m|>30 u-tn
100 0 ' 0-0
71 14 ! 14 ! 0
Atop dump near ' 118.5 il.12 x 102 1 68 0 0 ' 33
! active face . ;
2 7

3 2
3 7
1
I |
I : ,| : j
Atop dump near i 155.7 U.99 x 10 1 57 : 29 i 14 • 0
active face j ;
336 (1200) downwind ; 104.8 -2.11 x 102
336 (1200) downwind ' 107.0 12.48 x 102
1
: j t
100 j 0 ! 0 ; 0
68 • 17 ' 17 i 0
i
: a Percentage of the Total Number of
Total No. :
of Fibers :6,04d- 0.061-
5.58 x 107 44 46
4.48 x 10' 31 : 55
2,58 x W7 24 : 49

1.48 x 108 37 ; 51

6.07 x I07' 15 I 50
2.69 x 107| 22 : 42
I 	 I
Fibers

0.181- ,0.361- B.541-
0.36 pun 1 0.54 u<=>' 1 49 urn
8 \ I
10 ; 2
21 | 3

7 i 3

26 j 5
30 ' 3
	 | ,
1
2
2

2

3
3

Samples were collected on  20.3 cm x 25.4 era (8 in x 10 in)  Millipore filters.   The pore size was 0.8  am and the effective filter area was 425.4 en .

[1]  Figure 13  is a  location  plot of  the sampler locations  at the sampling site,
[2]  Phase contrast  optics and a  4 ran objective lens were used for optical counting.   The total magnification was 625X.  The minimum fiber diameter
     included in the counts i»as estimated at 0.5 |im,
t33  Electron microscopy counting and sizing were done at a magnification of 16,364X.   Fibers with a  diameter as small as 0.016 pan were counted,
[41  Particles  having an aspect ratio greater than 3:1 and approximately parallel sides were considered fibers.
[53  Fiber concentration was  <7 fibers in 100 fields counted.

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                                Table  8.  SAMPLING DATA AND AMBIENT AIR CONCENTRATIONS CF FIBERS TN THE VICINITY OF THE
                                                       JOHHS-MASVILLE WASTE DUMP; DEKISON, T3XAS


February 27,  1974
Weather Data  during Sampling Period:   Wind, Gusty Averaging 8.94 m/sec (20 mph) from the South (165° -195°); Temperature, 12,2°C (54°F)
Wanning to 1&.70C  (62°F)
i Fiber Concentration and Size Distribution by Fiber Concentration and Size Distribution by
Sampling Data [11
j j Approximate Satapling
: j Location with
! Sampling ! Respect to the
Site I Elevation, I Active Face of Waste
dumber! m 1 Dump, la (ft)
1
1
2
2
3
3
2
7
2
7
2
7
858 (2815) upwind
858 (2815) upwind
402 (1320) downwind
402 (1320) downwind
710 (2330) downwind
710 (2330) downwind
Optical Microscopy f2,41


Electron Microscopy f3,4j
•Size Distribution of Fibers &v Length as
Volume Size Distribution af Fibers by Length ; a Percentage of the Total Number of
of Air ! Total No. as a Percentage of the Total Number of Total Ko. '
Sampled.' of Fibers •
mj
122.3
81.5
per mj ;i.5-9.9 lira
1.71 x 104| 72
1.95 x 1C4! 78
156.3 1.41 x 10*; 76
81.5
122.3
101.9
2.40 x 10*! 69
1.72 x 101*! 68
1.87 x 10*! 68
Fibers
10-19,9 tioij20-29.9 urn
25 4
20 1
18 5
ZO 7
26 4
25 6
•of Fibers j 0.048-
>30 lira per ni I 0.06 urn
2 ',6.17 x 106I 6
1 16.73 x 10*: 9
2 2.75 x 106: 0
4 7.85 x 106; 9
2 < 6.06 x 106: 8
2 ! 6.27 x 105. 0
:
Fibers
•3.061- lO.lBl- 10.361- IQ.541-
0.18 urn1 0.36 nmj0,54 tun 1.49 urn
64 1 17 ! 6
56 j 19 | 2
67
37
54
82
28 ' 0
26 | 9
8
0
6
20
32 | 3 | 3
9 ! 5 j 5
Samples were  collected on  20.3  cm x  25.4 cm  (8 in x 10 in) Millipore  filters.  The pore size was 0.8 iim and the effective filter area teas 425.4 cm .
[1]  Figure 14  is  a  location  plot  of the  sampler  locations at the sampling site.

[2]  Phase contrast  optics  and a 4 ma objective lens were used  for optical counting.  The total magnification was 500K.  The minimum fiber di«nneter
     included  in the counts was estimated at  0.5  i^ffi.

[3]  Electron  microscopy  counting  and sizing  were done at a magnification of  16.364X.  Fibers with  a diameter as small as 0,016 un were counted,

t4]  Particles having an  aspect ratio greater than 3:1 and approximately parallel sides were considered  fibers.

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                                Table 9.  SAMPLING DATA AND AMBIENT AIR CONCENTRATIONS OF FIBERS IB THE VICINITY OF THE
                                                       JOHNS-MANVILLE WASTE DUMP; DENISON, TEXAS

February 28, 1974
Weather Data during Sampling  Period:  Wind,  Steady  at  4.92 m/sec  (11  aph)  from the  South  to  South-Southeast  (150°-180°); Temperature, 1?,2"C (63°F)

Sampling Data 11]
Approximate Sampling
;
1 Sampling
Location with

Volume
Respect to the of Air
Fiber Concentration and Size Distribution by
Optical Microscopy [2,4]

Fiber Concentration and Size Distribution by :
Electron Microscopy T3,4] |
•Size Distribution of Fibers by Length as;
Size Distribution of Fibers by Length t a Percentage of the Total Number of i
Total No. as a Percentage of the Total Number
Site ' Elevation. Active Face of Waste! Sampled, \ of Fibers Fibers
Hunger- si ! Dump, m (ft)
1 2
1 7
2 2

2 7
i
3 2
3 7
858 (2815) upwind
m^
per ttt-3 1.5-9.9 y.m; 10-19.9 urn
25, 5 jl.75 x 104 69 ' 26
858 (2815) upwind 22.8
402 (1320) downwind
28.0

402 (1320) downwind 1 35.1
710 (2330) downwind
22.1
710 (2330) downwind j 22,4
4.45 x 104- 66 ': 23
/ i i
2.80 x 10 • 69 ' 21

1.30 x 104! 69 i 19
4.27 x 104' 77 j 18
2.93 x 104i 72 ; i?
ZO-Z9.9 um:>30
6 ; 0
9 '' 2
7 3

7 5
3 2
8 3
of Total No. ! Fibers
jof Fibers |0.04B- '0.061- 0.181- 0.361- 0.541- i
umi oer m^ ^0.06 u«,0.18 uoilO.36 iun.0,54 am, 1.49 unri
4.98 x 107; 4 62
22 ' 6 6 !
3.83 x 107: 13 65 17 ; 2 ', 2 1
9.51 x 10?i 13 56

23 : 4 ' 4 i

4.48 x 107: 15 61 1 17 6 ; 2 !
=3.04 x 107: 17 : 46
2.97 x ID7; 5 45
26 9 i 3 i
28 : 10 13 '
Samples were collected on 20.3 cm x  25.4  cm (8 in x 10 in)  Millipore filters.   The pore size was 0.8 u-m and  the effective filter area «as 425.4 CDD ,
[1]  Figure 14 is a  location  plot  of  the  sampler locations at the sampling site.

[2]  Phase contrast  optics  and  a ^ mm objective lens were used for optical counting.   The total magnification was  500K.  The minitaum fiber diameter
     included  in the counts was estimated at  0.5 \IM,

[3]  Electron  microscopy counting  and sizing  were done at a magnification of 16,364X,   Fibers with a  diameter as small as 0.016 ^LED were counted.

[4]  Particles having an aspect ratio greater than 3:1 and approximately parallel sides were considered  fibers.

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     The confidence level of the results is difficult to
ascertain.  The statistical distribution for the microscopy
counting is ± 20%.  The error associated with the measurement
of the amount of air sampled is a maximum of ± 20%.  This is
based on the field flow meters and their calibration.  Other
errors associated with sample preparation, etc., cannot be
accurately ascertained without a multiple regression
analysis.  Errors of this nature were assumed to be system-
atic and identical for all samples.
     Results from the optical microscope analysis followed
an anticipated trend.  The highest values were noted at the
Coalinga mill site where values in the order of 10  fibers
per cubic meter were recorded.  Denison gave values in the
           A
order of 10  fibers per cubic meter while Waukegan had the
                                 2
lowest values with an order of 10  fibers per cubic meter.
This trend was anticipated because Coalinga had the highest '
visible emission rate and Waukegan had had recent heavy
rain and frost.
     The electron microscope analysis data did not show the
same trend as for the optical microscope data.  The highest
ambient air concentrations were again found at the mill site
                                                        8
in Coalinga, California, where values in the order of 10
fibers per cubic meter were noted.  Wattkegan gave values in
the order of 10  fibers per cubic meter, while Denison gave
            ft       "7
values of 10  and 10  fibers per cubic meter on separate
days.  This is in contrast to the optical microscope data,
where the Waukegan values were very much lower than Coalinga
or Denison.
     It is conjectured that the weather conditions would
explain this apparent anomaly between the trends of the
electron microscope and otpical microscope data.  It is noted
that Waukegan had experienced very heavy rain and then
freezing conditions.   The rain would scavenge the atmosphere,
                             83

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removing the suspended particles.  The efficiency of the
scavenging reduces dramatically with reduction in particle
size of the particulates.  For submicron particles, the
efficiency is very low indeed.  Again, once the particles
had been removed from the general atmosphere, they would be
bound to the earth trapped by the frozen water, which would
prevent their redispersion.  Thus, the larger fibers would
be preferentially removed and would be prevented from being
redispersed.  In these terms, an increase in the ratio of
smaller fibers is to be anticipated.
     The fiber size distribution obtained by optical micro-
scope analysis was similar for all the sites.  The majority
of the fibers, 65 to 75%, were in the size range of 1.5-
10.0' ym, while 10 to 257e were in the size range of 10.0-
20.0 ym.  Some variance from these observations is to be
found in the Waukegan data as a result of the very low
fiber count (less than seven fibers per one hundred fields
counted), which reduced the significance of the data.
     The size distributions obtained from the electron
microscope was not as consistent as the optical data.  The
most consistent size group was the 0.06 to 0.18 ym, where
results varied between 45 to 6070 in all of the samples.  It
was also observed that the number of fibers greater than
0.36 ym was a low percentage in all samples.
     There are a number of factors which contribute to the
size distribution of an ambient air aerosol size distribu-
tion.  They include: 1) the weather conditions; 2) the nature
of the source; 3) the proximity of other sources; and 4) the
distance from the source to the monitoring station.  These
factors will combine in a complex manner to give rise to
the resultant size distribution.  In the light of the number
of controlling factors, there is a high level of agreement
                             84

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in the data given, particularly at the hroad level electron
versus optical microscope observations.
AMBIENT AIR SAMPLES FROM AMBLER, PENNSYLVANIA
     The objective of the EPA ambient air sampling program
performed at Ambler, Pennsylvania was to determine whether
asbestos waste disposal sites for manufacturing plants that
use commercial asbestos are a major source of asbestos emis-
sions.  The method used was to isolate these sources from
other sources of asbestos emissions and compare the isolated
ambient concentrations that are generated by the waste dispo-
sal site to background ambient levels.
     Ten sampler sites were chosen for the Ambler study.  A
map of the sampler sites described in the ESED, EPA report
is reproduced in Figure 15,
     Site No. 1 Sewage Disposal Plant -- Sampler site located
approximately 305 m (1,000 ft) southeast of Nicolet's lagoon.
With a northwest wind, emissions from Nicolet's and Certain-
Teed 's active pile can be measured.  This site can also be
used as a background during a southeasterly wind.
     Site No. 2 Certain-Teed Active Pile Site -- Sampler
site located on the northwest side of Certain-Teed active
pile.   With a southwesterly wind, the emissions from Certain-
Teed active pile can be measured.  With a northwesterly wind,
the emission from the slope of the Nicolet pile can be mea-
sured.  This site in conjunction with Sites No. 1 and No. 3
with a northwesterly wind can identify the emission from the
Certain-Teed active pile.
     Site No, 3 South Sector of NicoletPile -- Sampler and
meteorological station site located on top of Nicolet active
pile on the south sector.   The site will measure the emissions
from the lagoon on the top of the active pile  with a north
wind.   With a south wind,  emissions from the Certain-Teed
                             85

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                                                                            O Sife 10
oo
er.
                                 O.8
                                 Kilometers
                     NORTH

  O Site of a Sampler

  ^ Site of Weather Station



NOTE' Map  Not  to Scale
                 Figure  15.   Sampler locations for ESED, EPA study. Ambler, Pennsylvania

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Compan3r can be further identified.  The meteorological sta-
tion will identify the wind speed and direction during this
s tudy.
     Site No. 4 West .Sector; of; Micolet; Pile -- Sampler site
located on west sector of Nicolet active pile.  With an east
wind, emissions from lagoon on top of active pile can be
measure-.d,
     Site No. 5 North Sector of Nicolet^Pi-le -- Sampler site
is located on north sector of Nicolet active pile.  With a
south wind, emissions from lagoon on top of active pile can
be measured.
     Site No_. 6 East Sector of Nicolet Pile -- Sampler site
is located on the east sector of Nicolet active pile.  With
a west wind, emissions from lagoon on top of active pile can
be measured.
     SJLte_No. 7 Nicolet Settling Pond -- Sampler site is
located at Nicolet settling ponds and will be operated down-
wind of emissions during dumping operation.  This occurs at
approximately 6:15 a.m. each day.
     Site No. 8 Lorcus_t Avenue.Site -- Sampler and meteorolo-
gical station site is located at the foot of the north side
of the Nicolet inactive pile in a playground on Locust Avenue,
This site will measure emissions from the inactive pile in
a residential area.  Met station will identify directions of
emissions.
     Site No. 9 South Chestnut Street Site -- Sampler site
is located in front yard of residence at 216 South Chestnut
Street.  With a southeast wind, the asbestos emissions can
be measured at this site.
     SiteNo. 10 Far EastSite -- Sampler site is located
at the corner of Main and Church Streets in ,a public park
                             87

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adjacent to an apartment complex.  With a westerly wind,
emissions from both plants can be measured in this residen-
tial area.
RESULTS FROM AMBLER PENNSYLVANIA
     Ambient air samples were collected by the EPA on mem-
brane filters with high-volume air samplers.  The sampling
periods varied from 30 minutes to 24 hours.  Most of the
samples, however, were collected for 12 hours.  The filters
were analyzed by Battelle Laboratories of Columbus, Ohio,
using the method developed by Henry, et al72 .   This TEM
analysis technique is described by Thompson73  of the EPA
as a semiquantitative determination of the mass of asbestos
collected from a measured volume of ambient air.  The
method estimates the mass from the measured fiber length
and breadth.  A fiber of cylindrical form and an average
density are assumed.  The results of the analyses are
                3
reported in ng/m .
     Typical results from the study are given in Table 10.
Results cover the periods of 6:00 a.m. to 6:00 p.m on
October 17, 1973, and October 18, 1973.
                             88

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Table 10.  AMBIENT AIR CONCENTRATIONS OF ASBESTOS
           FROM EPA STUDY AT AMBLER,  PENNSYLVANIA
Sampling
Site No.
1
2
3
4
5
6
7
8
9
10
Ambient Air Asbestos Concentrations
(ng/m3)
Samples Collected
6:00 am- 6: 00 pm
October 17, 1973
22
210
29
16
97
48
2 , 600*
7.2
23*
210*
Samples Collected
6:00 am-6:00 pm
October 18, 1973
11
19
53
5.5
130
160
1,200
12
13*
49*
   * 24 hour sampling period ending at 6:00 pm
                          89

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                          SECTION 7
        TOPOGRAPHIC, DEMOGRAPHIC, AND METEOROLOGICAL
                            DATA

TOPOGRAPHIC MAPS
     Topographic maps In the 1:250,000 scale were obtained
from the United States Geological Survey.  The topography
for a radius of 30 km is presented for the field sampling
sites.  Figure 16 shows the region near the Johns-Manvilie
Asbestos Mine and Mill at Coalinga, California; Figure 17
shows the region near the Johns-Manville Asbestos Products
Plant at Waukegan, Illinois; and Figure 18 shows the region
surrounding the Johns-Manvilie Asbestos-Cement Pipe Plant
at Denison, Texas.  Although no outdoor sampling was done
at the GAF Asbestos Mine and Mill at Eden Mills, Vermont,
the topography of this area is included in Figure 19.
     The topography of each of the field sampling sites is
different.  The Coalinga Asbestos Mine and Mill in California
is in mountains which rise sharply above the nearby valley,.
The mountains are very rocky with steep slopes and sharp
bends.  The valleys are quite narrow.
     The region surrounding the Johns-Manvilie Asbestos
Products Plant at Waukegan, Illinois, is flat.  Lake Michigan,
on the east, presents a level surface.  The land itself rises
very slowly above the elevation of the lake.
     Denison, Texas, the location of the Johns-Manville
Asbestos Cement Pipe Plant, is in a region of low rolling
                             90

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                     SAB BENITO COUMTT
                                                                                                                       FRESNO COUHTY
                                                                                                                               N
Scale
                                                           Contour interval 304,8 m (1,000 ft).
                               Figure 16.   Topographic map of the vicinity of the Johns-Manville asbestos
                                                  mine and mill at Coallnga,  California

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ISJ
                                                                                                        [KENOSHA
                                  KENOSHA COUHTY WISCONSIN!
                                     LAKE  COUNTY ILLINOIS
                                                                                                                        LAKE MICHIGAN
                                                                                                                      (ELEVATION  580 FT)
                                                                                                         iJOHNS-nANVILLE PLANT SITE
                                                                                                              :GHLAND  FARK
                                                                                                                                                              Nl
                                      o        5
                                      Scale
                                                              15
20      25 kilometers       COOK COUNTY ILLINOIS
                       Contour Interval 30,5 m (100 ft) .
                                                                       Figure 17.  Topographic map of the vicinity of Che Johns-Manville
                                                                                 asbestos products plant at Vlaukegan, Illinois

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MARSHALL COUNTY OKLAHOMA
                                                                  BSYAS COUNT? OKLAHOMA
                                                                           GRAYSOR COUNTY TEXAS
                                                                                                   N
                              Contour interval 76.2 m (250 ft).
     Fig-are  18,  Topographic map  of  the  vicinity  of  the Johns-Manville
               asbestos  cement pipe  plant at  Denison, Tejcas

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                                                                  ORLEANS COUNTY
                                                                                      N
                                                                     CALEDONIA C00NCT
                                                   WASHINGTON COUNTY
25 kilometers
                   Contour interval 152 n (500 ft).
Figure  19.  Topographic map  of  the vicinity of the OAF
     asbestos mine and mill at Eden Mills,  Vermont

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hills.  The Red River runs through a valley among the hills.
This valley is not very depressed in elevation nor adjoined
by steep slopes.  This topography is a "middleground" between
the mountains near Coalinga, California, and the flatlands
at Waufcegan, Illinois,
      Topographic data was not supplied with the EPA, Ambler
data; however, it was found that the area is substantially
flat.
DEMOGRAPHIC MAPS
      Population data on cities, towns, and counties was ob-
 tained from the United States Census Bureau.  This data was
 compiled and is presented for a radius of 30 km surrounding
 the field sampling sites.  The maps were prepared in the
 1:250,000 scale and are shown; 1) in Figure 20 for the region
 around Coalinga, California; 20 in Figure 21 for the vicinity
 of Waukegan, Illinois; 3) in Figure 22 for the locale of
 Denison, Texas; and in Figure 23 for Ambler, Pennsylvania.
      The four  maps show the extreme remoteness of the mine
 at Coalinga, California, as contrasted to the asbestos pro-
 cessing plants.  Both Waukegan, Illinois, and Denison, Texas,
 are urban; but, show extreme population density differences.
 Waukegan, Illinois, is part of a major center of population
 in contrast to the low population density at Denison, Texas.
 METEOROLOGICAL DATA
      Data for the Surface Wind Roses was obtained from the
 National Climatic Center at Ashville, North Carolina.  The
 data requested was for the nearest weather station for which
 records are maintained.  Table 11 lists the location of in-
 terest, i.e., the site of the asbestos plants, and the actual
 site where the weather readings were taken.
                              95

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                                                                    CENSUS DIVISION
                                                              6.0 persons/sq.  mile
                                                              2.3 persons/sq,  km
                           SAN BENITO-BITTESWATER
                               CENSUS DIVISION
                            0.7 persons/sq,  mile
                            0.3 persons/sp,  km
                                              UNION CARBIDE
                                                  MINE
                                                   o
                                                                                              SAN JOAOUIN-TRAUOUILITY
                                                                                                  CENSUS DIVISION
                                                                                                9.9 persons/sq. mile
                                                                                                3.9 oersotis/sa. km
KIMG CITY CEHSUS  DIVISION
  5,0 perstms/sq. mtle
  2.0 persotts/aq. km
                       SAN ARJ>0 CEHSOS
                         2,8 perstras/sq.  mile
                         1,1 persons/s.  km
  QCOALMCA PIT


O COALINGA ASBESTOS CD, MILL




 COALINGA CENSUS DIVISION)

   0.7 persQM/sq.  tan
                         CENSUS DIVISION
                    5,7 parsons/sq* mile
                    2.2 pftTBon
                                                                                                                                       km
OALINGA                   K i
 2(054 ?etsons/sq.  mile   IN
   302 persotis/sq.  km
               10       15      20       25  kilometers

KOTE:  Tienslcy of Census Division  is  rural density.
                                 Figure  20.   Demographic reap of the vicinity of the Johns-HanvIlie
                                           asbestos mine and mill at Goaltnga, California

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            KENOSHA COUNTY WISCONSIN
 LAKE CODNTY ILLMOIS
   URBAN POPULATION DENSITY

persons I si tan   persons/sq mile

over 1,562   glover 4,000

781-1,562    ra2,000-4,000


390-781      gI,000-2,000


under 390    Bunder 1,000


             UNSHADED AREAS AM NOH-ORBAH
       Scale
           0            5           10

           I	I	L
I
        I
       10
                                                                                 LAKE  MICHIGAN
                                                               JOHHS-KA.NVILLE  PLAHI  SITE
                                                                                                                            t\
                                                                                                                            N
                          Figure 21,  Demographic map of the vicinity of the Johns-Manville
                                        asbestos products plant at Waukegan, Illinois

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                       MARSHALL COUNTY OKLAHOMA
                          21,0  perscms/sq*  ma.o-e
                           8,2  persons/sq.  Km
                                       fortsBORO
                                         2,992 persons/sq. mile
                                         1,169 pfsrsQns/sq. km
                                                     &RYAS COUNTr OKLAHOMA
                                                     l^.l persons/sq. mile
                                                      5.5 persons/sq, km
                                                                                                   CDURANT
                                                                                                     2,779 persons/aa  „
                                                                                                     1  A6i"      "•*/ a
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                                                                                       20
                                                                                           miles
                                                                     10
20
                                        30
                                               Bucks County, PC.
Legend


Unmarked   <350 per./sq. mi.

A    1,000 - 5.OOO

B    5.OOO - IO.OOO

C   10,000 - 15,000

D       715,000
                                                                        Burlington County,
                                                                               N. J.
                  Camden County,
                        N. J.
Gloucester
County, N, J.
            Figure 23,  Demographic map of the vicinity of Nicolet,  Certain-Teed
                        asbestos products  plant at Ambler,  Pennsylvania

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          Table 11.  WIND ROSE SOURCES
Location of Interest
Location of Weather Station
Coalinga, California



Waukegan, Illinois



Denison, Texas



Eden Mills, Vermont



Gila County, Arizona



Ambler, Pennsylvania
 Stockton, California



 Waukegan, Illinois



 Sherman,  Texas



 Burlington, Vermont



 Phoenix,  Arizona



 Philadelphia, Pennsylvania
                       100

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     The surface wind roses are presented In Appendix D.
For each site, three wind roses are drawn; 1) January, 2) July,
and 3) Annual.  The January and July wind roses indicate
semi-annual differences in the wind parameters.  The most
noticeable example is Stockton, California.  The January
wind rose shows that the winds were calm 13.1% of the time
and blew from the east to southeast a total of about 30% of
the time.  In July, the winds were calm only 4.7% of the
time and less than 1% of the time were winds blowing from
the east to southeast.
     Meteorological data is usually gathered at airports and
cannot always be assumed to be representative of the local
region of interest.  This is especially true of the mountain-
ous region near Coalinga, California.  Stockton, California,
is situated in the valley.  The local topography surrounding
the mine and mill has a domineering effect on meteorological
parameters.  The deep valleys will channel winds, cause
turbulence, and create thermal gradients; hence, a descrip-
tion of the local winds at Coalinga should be measured at
the site.
                             101

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                          SECTION 8
           THE SIGNIFICANCE OF ASBESTOS EMISSIONS
       '   '            FROM OPEN SOURCES

INTRODUCTION
     The preliminary asbestos emission data obtained at the
Coalinga, Waukegan, and Denison sites, and the data from
Ambler supplied by the EPA, gave information on the concen-
tration of fibers to be found in the ambient air at or near
to these sites,  To assess the ambient air concentration of
fibers in a general area extending outward from these sites,
the EPA's Climatological Dispersion Model (COM) was used.
This model is described in the ensuing text.
     The model enabled a series of isopleths to be drawn
which give the predicted fiber concentration as a function
of distance from the source.  Super-imposed on to geographi-
cal maps, the area exposed to a given concentration is seen.
Demographic data, also on the map, indicate the exposure
levels of the local population.
     There are as yet no ambient air exposure levels accepted
by either federal, state, or local authorities because of
a lack of medical data.  During the course of this study, a
safe ambient air exposure level was suggested at the request
of the EPA.  This level is presented, along with other pro-
posed standards which were subsequently published in the
literature.
                             102

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SUGGESTED AMBIENT AIR ASBESTOS EXPOSURE STANDARDS
     Concentration isopleths as such are of little value
unless they can be related to a medical health standard.
Unfortunately, no such health standard has been agreed upon
by the scientific and medical communities.  For the purposes
of this study only, and at the specific request of the EPA,
                       3
a value of 500 fibers/m  was taken as a level above which
non-occupational exposure could be considered harmful to
health.  There is no medical evidence to support this level.
It was derived from OSHA occupational exposure limits in the
following manner.
     Ihe Occupational Health and Safety Act (OSHA) lists a
time weighted average (TWA) limit of 2 fibers per cubic
centimeter (a fiber is defined as having an aspect ratio of
3 to 1 and a length greater than 5 microns).  This limit was
effective July 1974.  A peak limit of 10 fibers/cc for any
15 minute period is also listed.  This occupational index
is based on medical evidence related to the development of
asbestosis during a 50 year working lifetime.  The  limit
also assumes the standard 40 hour working week.  For the
general populace, the ambient exposure consists of 168 hours
per week.  In addition,  the risk factor should be reduced by
                       3
a factor of at least 10 .   Thus,
(2 fibers/cc)  x         x 10~   x "" 3'|  *  50°
                                        C° *
                                      m
     The use of this numerical standard is cautioned.  The
OSHA regulation is based on incidences of asbestosis not
cancer.  Many uncertainties and anomalies are found in the
literature on the exposure to asbestos and the incidences
of cancer.  It is possible that for the development of
cancer, a degree of susceptability is requisite.  Some
                             103

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people appear to be affected by even the lowest exposure
levels, while others are unaffected by high exposure.
     Two recommendations for ambient air standards have been
proposed in recent publications.  The Illinois Institute for
Environmental Quality7* has proposed a maximum level of
              2
1,000 fibers/m  based on a 24-hour average; they also recom-
mend that a maximum 2-hour average concentration of 1,500 fi-
      3
bers/m  should not be exceeded more than once in a 24-hour
period or more than 30 times per year.
     The Connecticut Department of Environmental Protection
has also proposed an ambient air standard75 .  Their standard
of 30 nanograms per cubic meter can be approximated to a
1/1000 of the OSHA standard for occupational exposure of
2 fibers/cc when time weighted for a 24-hour, 7-day per week
exposure.
     The Illinois and Connecticut proposed standards are both
based on mortality rates projected from available medical
data.  It is stressed than these exposure levels are
proposed -- not accepted.
CLIMATOLOGICAL DISPERSION MODEL
     The EPA's Climatological Dispersion Model (CDM) deter-
mines the long-term (seasonal or annual) quasi-stable pollu-
tant concentration at a ground level receptor.  It uses
average emission rates from point or area sources, and a
joint frequency distribution of the wind direction, wind
speed, and stability for the same period.  This model is
available in computer program form on a time-sharing basis
from the Computer Sciences Corporation.  The user's guide
to this model was written by A.D. Busse and J.R.  Zimmerman76 .
An introduction to the theory of the model is given in
Appendix C.
                             104

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     The determination of the quasi-stable pollutant concen-
tration at any ground level receptor is obtained by calcula-
ting explicit values for the transport and decay of the
pollutant during its time aloft.  Transport is determined
by a complex interaction of wind direction and velocity
variables  as well as others; all are continuous variables.
For calculational simplicity, it is better to consider only
a small number of discrete ranges for each of the variables.
Thus, windspeed, for instance, is divided into the intervals
0 to 3, 4 to 6, 7 to 10, 11 to 16, 17 to 21, and > 21 knots
per hour.  Similarly, there are 16 wind direction classes
(22.5 degrees each) and 6 stability classes as well as 6
windspeed classes for a total of 576 combinations -- and
no further detail.  This class structure allows for the
definition of a simple correlation function, $, between the
three sets of variable classes.  That is, $ relates the fre-
quencies with which the various combinations occur (i.e.,
wind NNE at 3.05 to 6.10 m/seG with stability class 4, etc.).
     The calculation of the transport itself is accomplished
via a Gaussian plume model which can accommodate an exponen-
tial decay rate of the pollutant with time.  The spread of
the plume is internally parameterized in terms of the sta-
bility class.  An initial value for the standard deviation
for the vertical dispersion can be specified.  This parameter
reflects the topography of the source area.
     Some other degrees of freedom (inputs) are:  the height
of the mixing layer, the height of the smokestack (if any),
and the geographical distribution of the emitters.
     A cartesian coordinate block map is superimposed on the
physical map of the region.   Sources (point and/or area) are
identified by their coordinates and are assigned their emis-
sion rates.  Calculation proceeds additively, with the emis-
sion rates and weather conditions assumed stable for about
                             105

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one hour periods.  Fluctuations are not included.  The points
at which the pollutant output are desired are specified via
separate input and are available either printed as a table
or on cards, in a format suitable for calcomp interfacing.
     Some program modifications were required.  Specifically,
a modification was required to accommodate input windspeed
ranges in units of miles per hour rather than knots (conver-
sion to m/sec is done internally).   An additional change al-
tered the printout to eliminate scaling problems.
     It should be noted that the model does not allow for
pollutant interactions (i.e., fiber agglomeration or break-
down) and that no effects due to the size distribution of
the fibers can be calculated.  Finally, experience with the
model has shown that its predictions are generally high,
often by as much as 200%.  However, there is a provision in
the model for calibrating it by making simultaneous emission
and sampling measurements and obtaining a regression relation
between the model predictions and the sampling results.
The technique has had good results, and the calibration
measurements need not be performed on the same pollutant as
the one to be modelled, i.e., SO^ dispersion data can be
used to calibrate the asbestos dispersion model.
CLIMATOLOGICAL DISPERSION MODEL INPUT DATA
     The information required for the dispersion model input
is the area source size,  the number of areas, the class wind
speed, the stability class, and the source term.  The values
taken for each source are given in Table 12.  Since this
study was only a preliminary study to evaluate the signifi-
cance of emissions from waste dumps, no attempt was made to
subject every ambient air measurement to dispersion model
analysis.  Instead, one set of data was utilized from each
of the four sites.
                             106

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                     Table 12.  STABILITY CLASSES
                            (From Ref. 77)
Surface Wind
Speed (at 10 ra)
n/ sec
<2
2-3
3-5
5-6
> 6
Day
Incomin
Strong
A
A-B
B
C
C
K Solar Radiation
Moderate
A-B
B
B-C
C-D
D
Slight
B
C
C
D
D
Night
Thinly Overcast
or > 4/8 Low Cloud

E
D
D
D
<3/8
Cloud
	
F
E
D
D
The neutral class, D, should be assumed for overcast conditions during
day or night,
                                   107

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     The source size and the number of areas were determined
from the site survey.  The class wind speed is related to
the measured wind speed, and is found from the appropriate
table  (see Table C2, Appendix C) .  The stability class is a
function of the wind speed, the solar radiation conditions,
and the amount of cloud cover.  It is determined by observing
the meteorological conditions and then referring to a
reference chart (see Table 13) .
     The source term is derived from the ambient air measure-
ment taken at the site in terms of fibers per cubic meter.
Two conditions were established for the selection of the
ambient air value used: one was that it was a downwind sam-
ple, and two was that it represented the worst case of the
samples taken.  In this manner, the maximum extent of
population exposure could be estimated.  The ambient air con-
centration at the downwind sampling station is then related
back to the source emission in terms of fibers emitted per
second.  The method used is described by Turner77 .  In this
method, square area sources are considered as line sources
with a Gaussian distribution.  The method of computation is
outlined briefly below:
          Determine the stability class from the wind speed
          and incoming solar radiation conditions observed
          at the time that the sample was taken.
          Calculate the initial standard deviation in the
          horizontal direction, 0
                                 •^o
                       a   = side/4.3
          Use ffy  and the graphs in Turner's handbook to get
          x ,  tn8 distance to a pseudo point source.
           o
          Add x, the sample- source distance, to x  and use
          the appropriate graph to obtain a .     °
          Use x and the graphs to get a .
                                       2,
                             108

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      Table 13.  INPUT DATA FOR THE CLIMATOLOGICAL DISPERSION MODEL

Measured ambient OM
air asbestos
concentration EM
(f ibers/nr*)
Area source size
No. of area sources
Class
wind velocity*
(m/sec)
Stability class
Calculated source OM
term emission rate
(fibers/sec) EM
Coalinga
9,51 x IQ5
5.93 x 108
100 m x 100 m
4
6.93
D
1.65 x 1010
1.03 x 1013
Waukegan
2.48 x 102
6.07 x 107
150 m x 150 m
3
6.93
D
7.64 x 106
1.87 x 1012
Denison
2.80 x 104
9.51 x 107
210 m x 210 m
1
4.92
B
1.29 x 109
4.37 x 1012
Ambler
5.2 x 104
2.6 x 10?
167 m x 167 m
1
4.92
C
3.02 x 108
1.51 x 104
OM = measured by optical microscope
EM = measured by electron microscope
* class wind velocity obtained from measured velocity and reference to
  Table C2 in Appendix C.

-------
     •    The source term is then calculated from
                         Q = XTTCT a U
                         x      y 2
          where       Q = source term emission rate, fibers/sec
                      X = measured ambient air asbestos con-
                          centrations, fiber s/rrH
                 0v» a  = the standard deviation in the y and
                  ^       z directions, respectively
                      U = wind velocity, m/sec
     The assumption is made that the entire area source emits
fibers homogeneously at a constant rate.
     The computer program also requires that the area source
be described as squares on an emission grid map with each
square having its own emission source term.
     For the Ambler data, taken by the EPA, the worst case
data, taken at site number 7, gave an ambient concentration
             3
of 2,600 ng/m .  This value was converted to give the approxi-
mate numbers of fibers equivalent to the mass.  For conversion
to fibers of optical microscope size, the factor suggested
by the Engineering Equipment Users Association (EEUA)70  was
used, where 1 fiber =  0.05 ng.  This gave a total of 5.2 x 10
        3
fibers/m  greater than 5 \im.  Conversion to electron micro-
scope sized fibers can be approximated by using the factor
suggested by Thompson77 , where 104 fibers =  1 ng.  This gives
                   7         3
a total of 2.6 x 10  fibers/m  for fibers below 5 ym.
     (The above figures are only approximate because the
conversion factors are only approximate.  Further, the size
distribution of the collected sample is not known and, there-
fore, that part of the total mass which should be assigned
to a given conversion factor is not known.  However, the
largest error would result from the selection of a conversion
factor which can vary with the fiber size from 1 fiber =  10~  n
                             110

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Nicholson17 , to 1 fiber = 0.5 x 10"1 ng, EEUA70 .   For this
reason, the comparatively small error introduced by using the
total mass as representing each size fraction has been
ignore d,)
CLIMATOLOGICAL DISPERSION MODEL RESULTS
     The ambient air concentrations of asbestos were calcula-
ted at every kilometer on a 60 km by 60 km grid with the
source at its center.  The tabular computer output was
transferred to a grid and isopleths were drawn.  These iso-
pleths were superimposed onto demographic maps to show the
extent of the general population exposure.
     These maps with  the isopleths are shown for Coalinga,
California; Waukegan, Illinois; Denison, Texas; and Ambler,
Pennsylvania, in Figures 24, 25, 26, and 27, respectively.
The ambient air concentrations of asbestos fibers which are
1.5 ym and above are low in comparison to those fibers below
1.5 ym.  The difference is usually three or four orders of
magnitude.
     At a distance of approximately 1 kilometer from the
source, the proposed standard of 500 fibers per cubic meter
greater than 5 ym is only exceeded at two locations, Denison
and Coalinga.  However, the number of fibers less than 1.5
is very high, and, in all instances, is of the order of a
million fibers per cubic meter.
     The CDM model was unreliable beyond about 10 km.  At
10 km from the source, the 500 fibers per cubic meter was
exceeded in only one location, Coalinga.  The numbers of
fibers less than 1.5 ym at a distance of 10 km from the
source were found to be 1.6 x 10 , 4.5 x 10 , 2.4 x 10 ,
            2
and 4.S x 10 , respectively, for the Coalinga, Waukegan,
Denison, and Ambler locations.
                             Ill

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                          M*ndoto  C«ntui Oiv.

                          €.0 perions/sq. mil*
                          2.3 per§ans/»q. Km.
                                                             San Jooquln-Tranquillty
                                                             Ciniu* Division

                                                             9.9 p«noni/»q. mile
                                                             3,9 p»rion«/«q km.
                                        .8 par«ont/tq. mile
                                       0,7 psrtoni/tQ. km.
2,8 persons /tq, mile
I.I  pertons/sq  km.
Scale
        _L
          5
                    10 Kllamttirt
A  Johns - Manvlllg Mill Sit*

•  AsbMtcs  M!n» Stl*
                                                                     N
                                                                     Coallnga, California
                                                                     2,034 perion»/»q. mile
                                                                     802   p*r»on»/»a. km.
                                                Nat*t Population Dantlty Of C*n*ut Dlvltlon
                                                      I* Rural  D«n»lty.
                                                      Icoplalht  Havi Uniti Of Fib*rc/cu. m
                                                      Of  Air.
                                                      Optical  Data - Bald
                                                      EM  Data  -  Par*nth**If
Figure 24.  Asbestos fiber  concentration isopleths
                 for Coalinga,  California
                                112

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Kenotha County,WI»con»on
                                                              0,3 (4.9xl04)
                                                              0.5 (1.21108}
                                                              0.8 ( 2 i (O5)
                                                              1.6 ( 4 xlO9)
                                                              9  (IJiKJ6)
                                                              8  (Ex I06)
                                                       John«-Monvlll» Plont
                                                             Ldk* Michigan
                               Seal*
                               I	
          Cook County, llllnoli

Urban Population Dtmity
    Mr»on«/«o aOf    otnont /ta tun
  3 ov*r 4,000       (ov*r 1,562)


  S  2,000-4,000    (781-1,562)
  3

  I  \JOOO- Z.OOO    (390-781)


[T]|  undtr 1,000      (und«r390)

Unshaded Ar*a*  ar* Rural

         Figure  25.   Asbestos  fiber concentration  Isopleths
                            for Waukegan, Illinois
                                                    10 Kitom*t*ri
                           Note i liopltlln  hove units of fib«r«/cu m of air
                                Optical Data - Bold
                                EM  Data- Par«nth««i»
                           113

-------
 Marshal  County, OWonomc
 21.0  persons/sq mils
 32. parsons/so Km
         Byron County, Oklahoma
         14.1  perionj/sq mile
         5,5 pars one/sq Km
                                                                       Colbert,Oklahoma
                                                                       814 persons/sq miie
                                                                       314 psrtons/sq Km
                                                                           1,340 - (4.5*IO° 3
                                                                           670 - C2.27* I06)
                                                                           135  -  (4,58 «I05)
                                                                           70   -  <2.37x IO5)
                                                                           40  -  (1.35 x I05)
            potrsboro, Texas
            2,992 persons/Mi mile
            1,169 persons /sq km
           Petrin AFB, Texas
           3,418 persons/sq mi
                 person /sq km
                 Danison ,Texas
                    2 persons /tq mile
                 825 persons /sq Km
Scale
 I	
Note:
 0          5          IO kilometers

• Johns-Manville Plant Site
         Population density of counties is  rural  density.
         Isopleths  have  units of fiber* /cu m of air.
         Optical data - Bold.
         E M data -
              Figure  26.   Asbestos  fiber  concentration  isopleths
                                    for Denison,  Texas
                                            114

-------
  ' iBOplaHis have units off fibers/ou m of air
   Optical Data - Bold
   E M Data • Par«nM«»li
IO Kltom*t*r>
 Unmarked  >3SO Per/Sq Ml
  A   lOOO-SOOOPir./Sq.MI,
E B  SOOO -IO.QOO Par./ Sq. Mi.
  C 10,000-B,OQOP«r./Sq. Ml.
y D      >l5,CK3QP»r./S<(.MI.
          Figure  27.   Asbestos fiber  concentration isopleths
                          for Ambler,  Pennsylvania

                                        115
                                                                        Norm

-------
     It is concluded, therefore, that exposure to fibers of
greater than 1.5 ym is at a low level, while exposure to
fibers of less than 1.5 ym is high.  Until the vital issue
of the medical significance of small fiber exposure is
resolved, it would be premature to suggest that these
conditions are safe or constitute a non-occupational health
hazard.  The resolution of the medical question will undoubt-
edly be some years away.  Until such time, it would be
prudent to study the practicality of abating these emissions.
DISCUSSION OF THE USE OF THE CLIMATOLOGICAL DISPERSION MODEL
     The CDM was designed primarily for large area sources
and multiple point sources.  It was the design of the
model that the receptor points be at distances near the
sources, i.e., the radial distance to the receptor be the
same order of magnitude as the area source size.   The present
use of the CDM was completely opposite.  The receptor was
at a minimum distance of a kilometer from the source, while
the largest source term dimension was 210 meters  square.
The problems of the CDM for this type of use are  inherent
in the model itself.
     The major difficulty with the model is the way it cal-
culates emissions from an area source.  An angular segment
of 22%  centered at the receptor point is divided in 20
equal parts.  Along each radial line of these segments,  the
program queries at set radial distances (defined  in Table C4
of the manual) to search for the area source.  Once found,
the concentration is calculated.   This search technique is
the major source of error.  As radial distances increase,
the arc lengths increase, hence the area source could lie
entirely between the radial lines and never be found, resul-
ting in a zero output.  Where only part of the area source
is located,  an underestimate of the concentration value
results.
                              116

-------
     For point sources, a direct calculation between the
receptor and source is made.  This would eliminate zero
output.  An equivalent "point source" for each area source
was calculated and used as input to obtain better isopleths.
A division by zero occurred in the subroutine which calculates
the effective source height.  This type of error halts cal-
culation of the concentration at the receptor point.  Elimina-
tion of this division by zero requires a study of the CDM
computer program itself.  Such a task was beyond the scope
of this project.
     The resulting isopleths at the larger radial distances
were extrapolated through zero output where possible.  The
outermost isopleth is probably an underestimate of the am-
bient air concentration of asbestos fiber because of this
extrapolation.
                             117

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                           SECTION 9

                          REFERENCES
 1.   Hidy, G. M.  The Dynamics of Aerosols in the Lower
      Troposphere,  In:  Assessment of Airborne Particles,
      Mercer, Morrow, and Stober (ed.).  Springfield, 111.,
      C, C. Thomas, 1972. p. 81.

 2,   Selikoff, I. J.,  R. A. Bader, M. E. Bader, Churg, J.,
      and E. C. Hammond.  Am. J. Med. 42 (4):487, 1967, .

 3.   Maroudas, N. G.,  et al. Lancet. 1:804, 1973.

 4.   Stanton, M. F.  Proc.  of the Conf. on Biological Effects
      of Asbestos, Lyon, 1973 (in press),

 5.   Wagner, J. C., and G.  Berry.   IBID.

 6.   Timbrell, V., and R. E. G. Kendall.  Powder Technology.
      5:279, 1972.

 7.   Gross, P.  Private communication, Sept. 1973,

 8.   Smith, W. E., L.  Miller, R. E. Elaasser, and D. C. Hubert.
      Ann. N.Y. Acad. Sci.  1J2:456, 1965.

 9.   Hilscher, W. , et al.  Naturwissenschaften.  5_7_;356,  1970.

10.   Occella, E., and G. Maddalon. Med. d.Lavoro.  54:628,
      1963.                              .           ~~

11.   Laamanen, L. A.  Annal of the N.Y. Acad. of Sci.
      132:246, 1965.

12.   Schepers, G. W. H.  Ann. N.Y. Acad. Sci.  132:246, 1965.

13.   Sluis-Cremer, G.  K.  Ann.  N.Y. Acad.  Sci.  132:215,  1965.

14.   Bobyleva, A. T.  Lit.  on Air Pollution and Rel. Occ.
      Diseases.  4:251, 1960.
                              118

-------
15.   Lumley, K. P. S.  Annals of Occ. Hyg. 14:255, 1971.

16.   Byrun, J. C.  Annals of Occ. Hyg.  12_:64, 1969.

17.   Nicholson, W. J.  Proc. 2nd Intnl. Clean Air Cong.
      New York, 1970.  p. 136.

18.   Sellkoff, I. J.  Proc. 2nd Intnl. Clean Air Cong.
      New York, 1970.  p. 160.

19.   Simecek, J.  Staub-Reinhalt der Luft.  31(12):26, 1971.

20.   Bohlig, H., A. F. Dabbert, P. Dalquen, E. Main, and
      I. Hinz.  Environ. Res.  3_:365, 1970.

21.   Newhouse, M. L. and H. Thompson. Brit. Jnl. Indust. Med.
      22:261, 1965.

22.   Liebem, J. and H. Pistawka.  Arch. Environ. Health.
      14:559, 1967.

23.   Wagner, J. C., et al. Brit. Jnl. Indust. Med.  17:260,
      1960.                                          ~~~

24.   Sargent, H. E.  Paper presented at New England Water
      Works Association Meeting, Vermont, May 17, 1973.

25.   Jo'ins-Manville Research and Engineering Center.  Report
      No. E404-79, June 4, 1971.

26.   Johns-Manvilie Research and Engineering Center.  Report
      No. 425-T-1360, September 29, 1971.

27.   Hendry, N. W.  The Geology, Occurrences, and Major
      Uses of Asbestos.  Ann. N.Y. Acad. Sci.  132, 1965.

28.   Battelle Memorial Institute.  Identification and Asses-
      ment of Asbestos Emissions from Incidental Sources of
      Asbestos.  EPA program in progress.  Contract No.  68-02-0230,

29.   Herod, S. Pit and Quarry.  63_:62, 1971.

30.   Externbrink, ¥.  Gluckauf.  106_: 1020, October 1970.

31.   Reusch, J.  Gluckauf.  101:797, June 1965.

32.   Morse, K.  Am. Industrial Hyg. Assn. J.  31(2):160, 1970.

33.   MacLeod, D. A.  Can. Mining and Metallurgical Bui.
      53(1):40, 1960.
                              119

-------
34.   MacFadeen, D.  Can. Mining and Metallurgical Bui.
      53(6):431, 1960.
35.   Fife, W. E.  Mining Congress Jnl.  Sept. 1973, p. 44.
36.   McClung, J. D.  Coal Age.  75(1):76, 1970.
37.   Chironis, N.  Coal Age.  77.: 67, March 1972.
38.   Horsley, T. L.  Can. Mining and Metallurgical Bui.
      58:625, 1965.
39.   Shore, D. V.  Australian Mining.  64(10);20, 1972.
40.   Bauer, A.  Mining Annual Review.  June 1971, p. 155.
41,   Grossmueck, G.  Air Engineering.  1th 21, July 1968.
42.   Lewis, G. V.  Can Mining Jnl.  94(9):42, 1973.
43.   Chironis, N.  Coal Age.  77_:105» April 1972.
44.   Hutcheson, J. R. M.  Can. Mining Bui.  ,64:83, 1971.
45.   Lang, L. C. Can. Mining and Metallurgical Bui.  65:37,
      June 1972.
46.   Filatov, S. S.  Mining Magazine.  12£(2):163, 1973.
47.   Harmon, J. P.  Bureau of Mines Info. Circ. No, 7806,
      Oct. 1957.
48.   Anderson, F. G. and R. L. Beatty.  Bureau of Mines Info.
      Circ. No. 8407, March 1969.
49.   Bagnold, R. A.  The Physics of Blown Sand and Desert
      Dunes.  New York, William Morrow and Company, 1943.
50.   Fry, C. L.  Oklahoma:  Goodwell, Oklahoma, Panhandle
      Expt. Sta. Bull.  57, 1935.
51.   Daniel, H. A.  Am. Soc. Agronomy Jour.  2_8:570, 1936.
52.   Chepil, W. S. Soil Sci.  61:331, 1946.
53.   Chepil, W. S.  Am. Jnl. of Sci.  255_:12, 1957.
54.   Woodruff, N. P. and F. H. Siddoway.  Soil Sci. Proceedings
      P.  602, 1965.
                              120

-------
55.   Woodruff, N. P. and A. W. Zingg.  USDA, SCS-TP-112,
      1952.

56.   Ziingg, A. W.  Proc. 5th Hydraul. Conf, Iowa State
      University, Bull. No, 34, p. Ill, 1953.

57.   Zingg, A. W. and N. P. Woodruff.  Agron. Jnl.  43:191,
      1951.                                          ~~

58.   Skidmore, E. L.  Soil Sci. Soc. Am. Proceedings,
      p. ,587, 1965.

59.   Skidmore, E. L.,  P. S. Fisher, and N. P. Woodruff.
      Soil Sci. Soc. Am. Proceedings.  34:931, 1970.

60.   Beasley, R. P.  Erosion and Sediment Pollution Control.
      Iowa State University, 1962.

61.   Mining Magazine.   ^19:333, Oct. 1968.

62.   Mining Magazine.   123_:296, Oct. 1970.

63.   James, A. L.  Endeavor.  2_5_:154, 1966.

64.   Ludeke, K.  Mining Congress Jnl.  p. 32, Jan. 1973.

65.   Dean, K. C., R. Havens, and   T. H. Kimball.  USBM
      Report No. 7261,  1969.

66.   Dean, K. C., R. Havens, and E. G. Valdez.  Soc. Mining
      Engineering, p. 61, Dec.  1971.

67.   Dean, K. C. and R. Havens.  Am. Mining Congress, Denver,
      Colorado, Sept. 1973.

68.   Dean, K. C., R. Havens, K. T. Harper, and J. B. Rosen-
      baum.  Penn State Univ. Symp., University Park, Pa.,
      Aug. 1969.

69.   Cummins, D. G.  Coal Age.  71:82, Nov. 1966.

70.   Recommendations for Handling Asbestos.  Engineering
      Equipment Users Association, Handbook 33, 1969, London.

71.   Roy, S. L.  EPA-ESED, Durham N. C., personal communica-
      tion via Project Officer, David Oestreich.

72.   Henry, W. M., R.  E. Heffelfinger, C. W. Melton, and
      D. L. Kiefer.  Final report, EPA Contract No. CPA-22-69-110
      (February 29, 1972).
                              121

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73.    Thompson, R.  J.  and G.  B.  Morgan,   (Paper presented at
      the International Symposium on Identification and
      Measurement of Environmental Pollutants,   Ottawa, Ontario,
      Canada.   June 14-17, 1971.).

74,    Health Effects and Recommendations for Atmospheric Lead,
      Cadmium,  Mercury, and Asbestos.   Report No.  IIEQ 73-2,
      Illinois  Institute of Environmental Quality,  March 1973.

75.    Bruckman, L.  and R. A.  Rubino.   Paper No. 72-222.
      (Presented at the 67th Annual APCO Meeting.   Denver,
      Colorado.  June 1974.).

76.    Busse, A. D.  and J. R.  Zimmerman.   EPA Document No,
      EPA-R4-73-024, 1973.

77.    Turner, D. B. Workbook of  Atmospheric Dispersion Esti-
      mates. U.S.  Public Health Service Publication No.
      999-AP-26, 1970.
                              122

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                         SECTION 10

                         APPENDICES


                                                        Page

A.   Selected Bibliography and Abstracts                124

B.   Abstracts of Current, Related Research Programs
     Under Sponsorship of the Department of the
     Interior, Bureau of Mines, Washington, B.C.        157

C.   Pollutant Concentration Formulae for the
     Climatological Dispersion Model                    168

D.   Surface Wind Roses for Waukegan, Illinois;
     Stockton, California; Burlington, Vermont;
     Sherman, Texas; Phoenix, Arizona; and
     Philadelphia, Pennsylvania                         177
                             123

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            Appendix A
SELECTED BIBLIOGRAPHY AND ABSTRACTS
                 124

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             SELECTED BIBLIOGRAPHY AND ABSTRACTS
Anderson, Floyd G., and Beatty, Robert L.

Dust Control in Mining, Tunneling, and Quarrying in the
United States,1961 Through 1967.
Bureau of Mines, No. 8407, Washington, D, C. (1969).

     This report reviews and summarizes information on pre-
     vention and suppression of dust in mining, tunneling,
     amd quarrying published in the United States from 1961
     tlirough 1967.  Unpublished pertinent data developed
     or assembled by the Bureau of Mines during this period
     also are included.
Anonymous

Putting a Wet Blanket on Dust.
Minerals Processing, May, pp. 4-8 (1972).

     A combination of water and surfactant is sprayed at
     points of dust generation to suppress dust.  The
     Chem-Jet spray system is described.  The compound sur-
     factant should be miscible with water at all tempera-
     tures, free-flowing, of uniform viscosity, non-corrosive,
     non-toxic, and non-inflammable when used with the
     mineral being processed.

     A spraying system is described along with its costs.
Anonymous

Spray System Solves Dust Problems at Arundel Quarry.
Pit and Quarry, 65, No. 7, pp. 82-84 (1973).

     The installation of the Chem-Jet spray system is des-
     cribed.  This system sprays water with a surfactant,
     compound MR at points of dust generation.  The results
     shows satisfactory dust suppression.
Anonymous

Stabilizing Mine Dumps.
Mining Magazine, 119, No. 4, pp. 296-299 (1968).

     Up to the end of 1967, a total of R2,631,000 had been
     spent by mines of the South African Chamber on covering
     dumps with vegetation, rock or other material to pre-
     vent the emission of dust.  Of this Rl,408,000 was

      Preceding pap blank

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     spent on vegetation, Rl million of it being through the
     Vegetation Unit which has so far covered 3,000 acres.
     The present average cost, taking into account the wide
     variety of conditions --no two dumps or dams are
     completely alike -- works out at R250 per acre.  The
     eventual cost of treating all gold mine dumps and dams
     will be plus R7 million at present prices,
Anonymous

Surface Mining and Reclamation; A Boost with Bigger, Better
lyLstcli jLn.c?. s
Coal Age,' 77, No. 3, pp. 96-97 (1972).

     A conscientious effort to do a better reclamation job
     than that required by law characterizes the surface
     mining program of a progressive Ohio coal producer.
     Not resting on past achievements in reclamation,
     Anthony Mining has intensified efforts.  The addition
     o£ a 524-fwhp Allis-Chalmers HD-41 crawler tractor will
     boost current and future mining and reclamation efforts
Anonymous

Ventilating Open Pit Mines During Blasting.
Mining Magazine, August, p. 163 (1973).

     Description of Type NK-12KV Ventilator-Sprinkler.
     This turbo-propeller device is useful in suppressing
     dust.  Tests show that at a water consumption of
     180 m^/hr the solid content of the air during and
     shortly after a blast is reduced from 8.4 mg/m^ to
     2,4 mg/m^ in 28 minutes.  After 15 minutes, the solid
     content had dropped to 3.5 rag/m .
Asbestosis Research Council

Recommended Code of Practice for the Handling and Disposal
of Asbestos Waste Materials.
Thomas Jenkins, Ltd.,  London (1973).

     Procedures which satisfy the Asbestos Regulations of
     1969 for the disposal of asbestos containing waste are
     listed.  These recommended practices will protect both
     the worker and the general populace from ambient air
     exposure of asbestos.
                             126

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Asbestosls Research Council

Code of Practice for Handling Consignments of Asbestos
Fibre in British Ports.
Thomas Jenkins, Ltd., London (1969). Revised 1973.

     Procedures which satisfy the Asbestos Regulations of
     1969 during stevedore operations at dockside are des-
     cribed.  These practices consider not only the safety
     of the workers but also minimize the exposure of the
     general populace to asbestos in the ambient air.
Asbestosis Research Council

Technical Note No. 1:  The Measurement of Airborne Asbestos
Dust by the Membrane Filter Method.
Thomas Jenkins, Ltd., London (1970).

     The membrane filter method for determining the concen-
     tration of asbestos in the air is described.  Method
     of sample collection and typical types of equipment are
     detailed.  Lab mounting of the collected sample and
     counting by optical microscopy is described.  Finally,
     evaluation of the sample relating the fiber count to
     the ambient air concentration is illustrated.  The
     asbestos regulations are presented for comparison of
     field results.
Asbestosis Research Council

Technical Note No. 2:  Dust Sampling Procedures for use with
the Asbestos Regulations 1969.
Thomas Jenkins, Ltd., London (1971).

     This step by step guide describes the instruments and
     procedures for taking 10 minute and 4 hour samples
     for determining the time-weighted-average asbestos
     exposure in the working environment.


Asbestosis Research Council

Control and Safety Guide No. 1:  Protective Equipment in
the Asbestos Industry (Respiratory Equipment and Protective
Clothing).
Thomas Jenkins, Ltd., London (1973).

     The Asbestos Regulations 1969 require respirators and
     protective clothing for employees working with asbestos.
     The conditions which require respirators are described.
                             127

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     The  types of respiratory equipment, their cleaning and
     maintenance, and sources of suppliers are listed.  The
     types of protective clothing, the methods of cleaning,
     and  suppliers of such clothing are listed,  Ac e onto da t ions
     for  changing from protective clothing to street clothes
     without contaminating the workers personal garments are
     described.
Asbestosis Research Council

Control and Safety Guide No. 2:   The Application of Sprayed
Asbestos Coatings,
Thomas Jenkins, Ltd., London (1972).

     This guide describes procedures for minimizing asbestos
     dust emissions from the following operations:  the
     application of sprayed asbestos coatings by a process
     which includes a predampening system; the application
     of sprayed asbestos coatings by a process which does
     not include a predampening system; the application of
     asbestos-based coatings which are first prepared into
     a slurry form before spraying or applying by hand tools;
     the stripping of old asbestos-based coatings; and the
     cleaning of work areas, the bagging and disposal of
     waste, and the cleaning of equipment after completion
     of the aforementioned operations.


Asbestosis Research Council

Control and Safety Guide No. 3:  Stripping and Fitting
of Asbestos-Containing Thermal Insulation Materials.
Thomas Jenkins, Ltd., London (1973).

     This guide describes the regulations which cover the
     thermal insulation industry when using asbestos-contain-
     ing materials,  Procedures for minimizing asbestos
     dust emissions from the following operations:  the
     stripping of old insulation, the installation of new
     insulation, the handling and storage of materials,
     and site hygiene are outlined.


Asbestosis Research Council

Control and Safety Guide No. 4:  Asbestos Textile Products,
CAF/Asbestos Beater Jointings and Asbestos Millboard.
Thomas Jenkins, Ltd., London (1971).

     This guide covers general regulations and practices
     such as good housekeeping, proper handling and storage
     of materials and waste disposal.  Specific operations
                            128

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     for which procedures are recommended to abate asbestos
     diist emissions are:  the use of asbestos cloth in the
     manufacture of protective clothing and fire protection
     materials; the use of asbestos cloth in mattress making;
     the use of asbestos cloth in thermal insulation; the
     use of asbestos rope lagging for thermal insulation;
     and the use and fabrication of asbestos millboard.
Asbestosis Research Council

Control and Safety Guide No. 5:  Asbestos-Based Materials
for the Building and Shipbuilding Industries and Electrical
and Engineering Insulation.
Thomas Jenkins, Ltd., London (1973).

     This guide contains recommended procedures for working
     with the following asbestos-based materials; corrugated
     and flat sheets, and all ancillary asbestos cement
     building materials; rainwater, soil, flue pipes, and
     cisterns; moulded and extruded building products;
     asbestos insulating board and asbestos wallboards;
     high density asbestos cement and resinated laminates
     used in electrical engineering; water and sewer pipes;
     and asbestos felt and paper.  The recommended practices
     cover the following operations:  cutting and machining
     using both power and hand tools; sanding; drilling;
     punching; filing; and cleaning.  Hoods for power tools
     are illustrated and some suppliers are listed.


Asbestosis Research Council

Control and Safety Guide No. 6:  Handling, Storage,
Transportation, and Discharging of Asbestos Fibre into
Manu fac turing Proc e s s.
Thomas Jenkins, Ltd., London (1971).

     The guide presents recommended practices covering the
     operations of handling, storage, transport, and dis-
     charge of the asbestos fiber into the manufacturing
     process that will reduce asbestos emissions.  Exhaust
     ventilation,  use of respirators, use of protective
     clothing, waste disposal,  and general hygiene and good
     housekeeping are among the practices recommended.
                             129

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Asbestosis Research Council

Control and Safety Guide No. 7:  The Control of Dust by
Exhaust Ventilation when Working with Asbestos.
Thomas Jenkins, Ltd., London (1973).

     Typical dust control system for control of asbestos
     dust emissions are described.  Dust control systems
     normally consist of (1) hooding, (2) ducting, (3) dust
     collector; and (4) fans.  Each component of the system
     is described with several examples illustrated.  Costs
     of systems are given.
Asbestosis Research Council

Control and Safety Guide No. 8:  Asbestos Based Friction
Materials and Asbestos Reinforced Resinous Moulded Materials
Thomas Jenkins, Ltd., London (1970).

     This guide cites practices which would minimize asbes-
     tos dust emissions when working with the following
     materials:  asbestos based friction materials both
     moulded and woven which are available in (a) roll,
     sheet, or pad form, (b) liners or facings, drilled and
     undrilled, and (c) the above materials bonded or
     rivetted to components; and asbestos reinforced resin-
     ous moulded materials which are available in (a) sheet,
     rod, or tube form, (b) machined components to specifi-
     cations of customer, and (c) moulded components to
     customer's requirements.  Operations to which these
     products are subjected to are:  cutting, grinding,
     linishing, drilling, milling, sanding, turning, and
     routing.
Asbestosis Research Council

Control and Safety Guide No. 9:  The Cleaning of Premises
and Plant in Accordance with the Asbestos Regulations.
Thomas Jenkins, Ltd., London (1973).

     The Asbestos Regulations require cleanliness of premises
     and plants using asbestos and asbestos-containing
     materials.  Recommended procedures for satisfying this
     law are presented for the cleaning of floors, walls,
     machinery and equipment, overhead structures, and waste
     disposal.  Types of vacuum cleaning equipment are
     described and some suppliers are listed.
                             130

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Atkinson, T.

Open-Pit Mining.
Mining Annual Review, June, pp. 155-173 (1971).

     Review of the open-pit mining industry.  The economics
     of the scale of mining are tremendous with many fac-
     tors to be considered.  New equipment, financing
     trends, and mine planning are discussed.  The impact
     of environmental pressures on the open pit mining
     industry, both present and future, are reviewed.
Bauer, Alan

Current Drilling and Blasting Practices in Open Pit Mines.
Mining Congress Journal, 58, No. 3, pp. 20-27 (1972).

     The trend in the mining industry to large rotary drills
     ha.s continued and percussive drills have largely been
     replaced.  The latest innovations on rotary drills
     include features for automatic drilling.

     AN-FO and slurries are still the predominant explosives
     used in open-pits.  The two explosives are compared.
     The production levels of shovels are compared with
     explosive consumption.
Beasley, R. P.

Erosion and Sediment Pollution Control.
Iowa State University Press, Ames (1972).

     This book treats the movement of soil by nature's
     forces.  The effects of man's disturbance of the en-
     vironment is discussed.

     Movement of soil by wind and water is described.  A
     semi-empirical soil-loss prediction equation is devel-
     oped.  The control and diversion of excess water to
     prevent erosion by such means as spillways, channels,
     basins, ponds, etc., are discussed and evaluated.  The
     planning of agricultural systems and urban development
     with respect to erosion and sediment control are
     presented.

     A basic introduction to field surveying and the use of
     topographic maps and aerial photographs is given.
                             131

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Berlyand, M. E.

Investigations of Atmospheric Diffusion Providing a
Meteorological Basis for Air Pollution Control.
Atmospheric Environment, 6, No. 6, pp. 379-388 (1972).

     A summary of the principal lines of inquiry into the
     problem of atmospheric diffusion, including practical
     applications, in the U.S.S.R.  Topics summarized are
     Guassian and k-theory diffusion models, plume rise and
     point-source diffusion methods, multiple sources, and
     abnormal meteorological conditions,
Chepil, W. S.

Sedimentary Characteristics of Dust Storms:  I.  Sorting of
Wind-Eroded Soil Material.
American Journal of Science, 255, No, ls pp. 12-22 (1957).

     Sorting of soil materials by the wind is an intricate
     phenomenon,,  The most distinct feature in the whole
     sorting process was found to be the peak diameter of
     the saltating grains.  Fractions larger than the peak
     diameter tend to remain In the wind-eroded fields, and
     particles smaller than this diameter tend to be de-
     flated and carried far through the atmosphere.  Depend-
     ing on soil class, from 31 to 78 percent of particles
     smaller than 0,1 mm in diameter contained in the wind-
     transported soil fraction are deflated by a single
     windstorm.  Silt generally is more readily deflated than
     sand or clay.  Wind erosion has caused little change in
     texture of loess soils but has tended to remove the
     fine constituents from the coarser-textured soils,
     leaving the sand behind.  This sorting process if con-
     tinued even for a day or two adds considerably to the
     general sandlness of the affected areas and to conse-
     quent irreparable depletion of soil productivity,


Chepil, W, S., and Woodruff, N. P.

Sedimentary Characteristics of Dust Storms:  II.   Visibility
and Dust Concentration,
American Journal of Science, 255, No, 2, pp. 104-114 (1957).

     Analysis of some dust storms in Kansas and Colorado
     during 1954 and 1955 Indicates a relationship between
     visibility and atmospheric dust concentration when rules
     of Houghton are followed.   Visibility varies inversely
     as some power of concentration, and concentration varies
     inversely as a certain power of height.  The quantity of
     soil removed from any region for any storm or period of
     time can be estimated.


                             132

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 Chepil,  ¥.  S.

 Sedimentary Characteristics  of Dust  Storms:   III.  Composition
 of Suspended Dust,
 American Journal of Science,  255, No.  3,  pp.  206-213  (1957).

      Wind-blown dust varied  widely in  its composition depend-
      ing on the composition  of eroded  soil, the year of mea-
      surement,  and  the  distance and  height of transport,
      The composition of the  dust was like the composition of
      many samples of loess.   The size  distribution of dust
      and of coarser materials transported at  any height or
      deposited  anywhere after any single windstorm was
      characterized  by a single peak  diameter  of the discrete
      particles  and  by arms on each side of the peak falling
      off Independently  of each other at some  constant rate.
      The peak diameter  varied from one graded material to an-
      other,  depending on the  physical nature  of the soil,
      distance and height of  transport, and possibly the
      velocity of the wind.


 Cralley,  Lewis  J.

 Identification  and  Control of Asbestos Exposure.
 American Industrial Hygiene Association Journal, 32, No. 2,
 pp.  82-85  (1971).

      Asbestos can be used safely in  modern industrial tech-
      nology  if  adequate  precautions  are taken to prevent
      excessive  and  unsuspended exposures.  To distinguish
      between asbestos and other fibers, new techniques must
      be  applied to  electron microscopy and diffraction, emis-
      sion and atomic  absorption spectrophotometry, electron
      microprobe,  and neutron  activation analytical procedures.
      Standards  and  evaluation techniques should be based on
      airborne fibers  and the  use of  the membrane filter and
      phase contrast  microscopy  for sampling and counting.
      Controls should  include  procedures for the safe trans-
      port of asbestos; exhaust ventilation and personal pro-
      tection at work sites;  the safe disposal of waste
      dusts; and the  prevention  of community contamination.


Cummins,  David G., Plass, William T., and Gentry,  Claude E.

Properties and Plantability of East Kentucky Spoil Banks.
Coal Age, 71, No. 11, pp. 82-85  (1966).

     The spoil bank resulting from strip or open-pit mining
     is a heterogeneous  mass  of earth that has physical and
     chemical properties determined by the rock strata over-
     lying the coal.  The material is unique,  bearing little
                              133

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     resemblance of the original soil mantle and it may pose
     difficulties to those attempting revegetation.  These
     difficulties have given rise to our present study of
     spoils from the eastern Kentucky coalfields.  In this
     study we will identify the chemical and physical char-
     acteristics of spoil-bank material and evaluate their
     influence on plant establishment and growth.


Davis, W. E., and Associates

National Inventory of Sources and Emissions:  Cadmium,
Nickel, and Asbestos; Section III Asbestos.
National Air Pollution Control Administration, No. CPA 22-69-131,
Washington, D.C. (1970).

     The flow of asbestos in the United States has been
     traced and charted for the year 1968.  The apparent
     consumption for the year was 817,363 tons and the domes-
     tic production was only 120,690 tons.  Imports,  mostly
     from Canada, totaled 737,909 short tons.  There was no
     recovery from scrap.

     Emissions to the atmosphere during the year was 6,579 tons.
     About 85 percent of the emissions were due to mining
     and milling operations.  Estimates of emissions are
     based for the greatest part on observations made during
     field trips, and on the limited information provided
     by mining, milling, and reprocessing companies.   Infor-
     mation was not available regarding the magnitude of
     the emissions or the particulate size.

     There were no emission records at any of the locations
     visited.


Dean, Karl C., Havens,  Richard,  and Harper, K. T.

Chemical and Vegetative Stabilization of a Nevada Copper
Porphyry Mill Tailing.
Bureau of Mines, No.  7261 (1969).

     The Bureau of Mines stabilized 10 acres of windblown
     copper mill tailings at McGill, Nevada, by a combination
     chemical-vegetative procedure.  Legumes, winter  wheat,
     wheatgrasses,  and wild rye were seeded, and the  area
     was subsequently sprayed with a resinous adhesive chemi-
     cal to stabilize the sands  until the vegetation could
     grow.   During the year since treatment, the area has
     been well stabilized against wind erosion.  The  estab-
     lished vegetation appears to be capable of self-perpetuation
     and renewal without irrigation.  The cost of stabilizing
     the area was $135.50 per acre.
                             134

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Dean, Karl C., Havens, Richard, and Valdez, Espiridion G.

USBM Finds Many Routes to Stabilizing Mineral Wastes.
Mining Engineering, 23, No, 12, pp. 61-63 (1971).

     In gauging the seriousness of mineral waste problems,
     cognizance should be taken of the surroundings.
     Choice of method to alleviate a specific waste problem
     will depend upon the circumstances of individual waste
     accumulations.  Physical, chemical, vegetative,  and
     combination methods are practical stabilization proce-
     dures.  Preplanning of waste disposal, often ignored in
     times past, is now a usual practice.


Denton, George H., Hassel, R. E., and Scott, B.  E.

Minimising In-Transit Windage Losses.
Mining Congress Journal, 58, No. 9, pp. 49-53 (1972).

     Low volatile coal utilized by the Youngstown Sheet and
     Tube Co. is produced by Olga Coal Co. at Coalwood, W.Va.

     This coal is used at coke plants at Youngstown,  Ohio,
     and Indiana Harbor, Indiana.  Loss of coal  in transit
     has averaged 2,700 Ibs.  A latex spray has  been used
     to bind the top layer of coal in the railroad hoppers.
     Loss of coal in transit now averages 600 Ibs.


Engineering Equipment Users Association

Recommendations for Handling Asbestos.
Handbook No. 33, London (1969).

     Medical hazards in industry have been known from antiquity
     and new ones are constantly being discovered.   It is
     the duty of management, sometimes legally and always
     morally, to take every possible step to protect their
     workmen.

     This booklet relates to asbestos, a substance which
     makes an interesting study in the evolution of occupa-
     tional hygiene.  The ill-effects of inhalation of the
     dust were known to the Romans:  Pliny in the 1st
     Century A.D. describes the use of respirators  by asbes-
     tos miners.  Nineteen centuries later, in 1931,  the
     Asbestos Regulations were formulated in this country
     and now, in view of much recent research, they have
     been revised in order to give protection to whole
     groups of workers who were not previously recognized
     as being at risk.
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     Naturally, the ideal solution is to use a safe substitute,
     which is the policy being progressively implemented by
     members of E.E.U.A.  However, for cases where substitu-
     tion is not practicable, and to deal with existing
     installations, the nature of the hazards and the ways
     of overcoming them in accordance with the proposed new
     legislation is described.  It is not an unattainable
     counsel of perfection; precautions along these lines are
     already in use in many factories all over the country.


Gibbs, Graham W., and Lachance, Maurice

Dust Exposure in the Chrysotile Asbestos Mines and Mills
in Quebec.
Archives of Environmental Health, 24, No, 3, pp. 189-197
(1972).

     Past and present features of the Quebec chrysotile
     mining and milling environment and methods used to
     establish indices of exposure for epidemiological
     studies are described,  Environmental dust concentra-
     tions used for calculation of dust exposure indices
     were derived mainly from systematic midget-impinger
     samples taken since 1948, using impinger and a variety
     of other techniques.  Though dust levels within the
     industry fluctuated widely, there was a steady fall
     from an average of approximately 75 million particles
     per cubic foot (MPCF) in 1948 to less than 10 MPCF in
     1968,  Considerable variation in the fiber content of
     airborne dust in this industry suggests that any safety
     standard should probably take account of fibrous and
     nonfibrous components.


Gifford, Franklin A.,  Jr.

Atmospheric Dispersion.
Nuclear Safety, 1, No. 3, pp. 56-68 (1960).

     One of the chief sources of uncertainty in estimating
     the hazard associated with accidental or planned re-
     lease to the atmosphere of fission-product activity
     has been the lack of reliably measured values of atmos-
     pheric dispersion coefficients.   In the absence of any
     obvious alternative, Button's well-known mathematical
     dispersion model has been used in many reactor hazards
     analyses for evaluating effects  far beyond the limits
     for which the model can confidently be expected to be
     reliable, e.g., distances of the order of 1 km and near
     adiabatic (neutral) conditions of atmospheric stability.
     Consequently, the appearance, in several recent papers,
     of a sizable quantity of new atmospheric dispersion
                             136

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     observations is of considerable interest in connection
     with the meteorology of nuclear safety problems.  Fur-
     thermore, the calculation of atmospheric dispersion by
     the method of moving averages, as has been proposed
     recently, seems to provide an improved means of calcu-
     lating dispersion, not only because the technique has
     less restrictive boundary conditions but also because
     it: is well adapted to the interpretation of continuously
     monitored atmospheric data.


Gifford, Franklin A., Jr.

The Area Within Ground-Level Dosage Isopleths.
Nuclear Safety, 4, No. 2, pp. 91-92, 97 (1962),

     The total radioactive dosage to a population has fre-
     quently been identified as an important aspect of the
     potential hazard associated with reactor accidents.

     The total population dosage is equal to the product of
     people times radioactive dosage, summed over the popu-
     lation, with appropriate high- and low-dosage cutoffs
     taken into account.  To expedite computation of this
     quantity, it is evidently necessary to be able to cal-
     culate the area inside ground-level isodose contours,
     i.e., the intersection between the surface formed by
     a given air concentration or dosage value and the
     ground.

     Based on ground-level air-concentration isopleths com-
     pxited by means of the generalized Gaussian dispersion
     model) calculation of these contours is described.


Gifford, Franklin A., Jr.

Use of Routine Meteorological Observations for Estimating
Atmospheric Dispersion.
Nuclear Safety, 2, No. 4, pp. 47-51 (1961).

     Estimates of atmospheric dispersion are essential infor-
     mation in the selection of a reactor site and in the
     evaluation of the hazards of reactor operation.  In
     selecting a site, the dispersion characteristics of
     the atmosphere at the various sites under consideration
     are important because most reactors, if not all, gen-
     erate or induce some atmospheric radioactivity during
     routine operation and because there is the possibility
     of accidental release of radioactivity to the atmos-
     phere.  Only a few forecasters are familiar with low-level
     dispersion problems, and consequently it is desirable
                             137

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     that simple, easily applied methods of estimating
     atmospheric dispersion, preferably those employing
     routine meteorological observations


Gifford, Franklin A., Jr.

Atmospheric Dispersion Calculations Using the Generalized
Gaussian Plume Model.
Nuclear Safety, 2, No. 2, pp. 56-59, 67-68 (1960).

     A number of formulas for dealing with various practical
     dispersion problems that arise in reactor hazard
     analyses are based on the widely used dispersion model
     formulated by Button.  However, results of recent dis-
     persion experiments have more and more often been pre-
     sented in terms of the simple Gaussian interpolation
     formula.
Grossmueck, Gerard

Dust Control in Open Pit Mining and Quarrying.
Air Engineering, 10, July, pp. 21-22, 25 (1968).

     More attention is being paid at present to the problems
     presented by dust in pits and quarries and in ancillary
     plants.  Dust can not only be as much of a nuisance
     and safety or health hazard as it is underground but
     it can also become a public liability when the pit or
     quarry is located in populated areas.

     Dust is usually more difficult to control in open pits
     than underground because clouds or flows of dust-laden
     air often are not and cannot be confined; huge tonnages
     of ore or waste are being blasted or broken,  handled,
     and conveyed in wide open spaces; and the influence of
     uncontrollable atmospheric and climatic conditions may
     be great.

     Also,  the mechanical equipment to be used may not have
     been designed for the particular dust and climatic con-
     ditions; or it may not have built-in dust 'control
     so that the mine itself may have to introduce original
     ideas and designs.
                             138

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Herod, Sandy

Carson Leads Way in Air Quality Control.
Pit and Quarry, 63, No. 11, pp. 62-68 (1971).

     Lime, mined with open pit mining and its subsequent
     crushing, is a very dusty industry.  Methods of dust
     control in the pit, at the crusher, and on storage
     piles are described.  An environmental conscious staff
     is necessary to minimize dust.


Holt, P. F., and Young, D. K.

Asbestos Fibers in the Air of Towns.
Atmospheric Environment, 7, No. 5, pp. 481-483 (1973).

     Many observers have reported that asbestos bodies are
     present in the lungs of town dwellers who have had no
     industrial exposure to asbestos, suggesting that asbes-
     tos may be a normal contaminant of the urban atmosphere.
     The air of several cities — London, Reading, Rochdale,
     Bochum, Dussoldorf, Prague, Pitsen, Johannesburg!!, and
     Reykjavik -- has been sampled using tnillipore filters.
     The samples were transferred to carbon film on a grid
     and they were examined by electron microscopy.  Asbestos
     fibers were found in samples from every town.  They
     ware mostly present as single fibrils but some were in
     agglomerates that contained many fibers.


Horsley, T. L.

Drilling and Blasting at the Cassiar Mine.
The Canadian Mining and Metallurgical Bulletin,  58, No. 6,
pp. 625-628 (1965).

     This paper deals with the drilling and blasting methods
     employed at the Cassiar mine, which is located just
     south of the B.C.-Yukon border.  It covers both the
     "pit" and "peak" mining operations.  Specific problems,
     such as working in frozen ground, are discussed, and
     the breaking characteristics of the various rock for-
     mations are outlined.  The paper concludes with a brief
     mention of the equipment used in the operation, as well
     a« an outline of the breaking costs.
                            139

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Hutcheson, J. R. M.

Environmental Control in the Asbestos Industry of Quebec.
The Canadian Mining Bulletin, 64, No. 712, pp. 83-89 (1971).

     The asbestos mining industry in the Eastern Townships
     of Quebec has early recognized the undesirable side-
     effects associated with mineral production, such as air
     pollution, noise and unsightly waste dumps.  In order
     to efficiently achieve the industry's aim of eliminating
     or minimizing these objectionable features of mining,
     all of the asbestos producers In Quebec interchange in-
     formation, knowledge, and design dealing with the en-
     vironmental control measures through the Environmental
     Committee of the Quebec Asbestos Mining Association.

     The paper describes what has been done and what is
     planned for the future in the various problem areas,
     such as control of dust emitted during the open-pit
     drilling operation, control of dryer stack emissions,
     control of the environment in ore,  fiber and tailings
     handling operations, rehabilitation of the countryside
     covered by waste dumps, and many others.


James, A, L.

Stabilizing Mine Dumps with Vegetation.
Endeavor, 96, pp. 154-157 (1966).

     The waste materials from the gold mines of the Witwatersrand
     in South Africa have accumulated over the years until
     they have formed large dumps, dangerously liable to
     erosion by air and water.  It was not possible to sta-
     bilize these dumps by physical means, and this article
     describes experiments using vegetation for this purpose.
     It also describes the methods used to alter the chemical
     nature of the dumps so that the vegetation would form a
     permanent establishment.


Laamanen, Arvo, Noro, Leo, and Raunio, V.

Observations on Atmospheric Air Pollution Caused by Asbestos.
Annals of the New York Academy of Sciences,  132, pp. 240-254
(1965).

     The mining (quarrying) of asbestos  in Finland has been
     carried out for approximately fifty years.  Current
     production is about 15,000 tons of anthophyllite asbes-
     tos per year.  In his work on nonoccupational endemic
     asbestosis, published in 1960,  R. Kiviluoto found cal-
     cifications of pleura on x-ray examination in approximately
                             140

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     500 people living around the mines.  V. Raunio, who at
     present is continuing the study of the incidence of
     pleural calcifications in the population around the
     mines, has mentioned that 1,300 more cases have been
     found.  Kiviluoto, however, estimates that about ten
     per cent of the population living around the mines
     might have pleural plaques.  At the request of V. Raunio
     and the Finnish Asbestos Company, Suomen Mineraali,
     the Institute of Occupational Health has performed some
     air pollution studies around the mines, to investigate
     the presence of asbestos in the air.  Some preliminary
     observations have been made.
Lang, L. C., and Favreau, R. F.

A Modern Approach to Open-Pit Blast Design and Analysis.
The Canadian Mining and Metallurgical Bulletin, 65, No. 722,
pp. 37-45 (1972).

     In modern bias ting technology blasts are designed and
     analyzed on an energy-mass-time relationship.  The
     energy of the explosive is derived by computer analysis
     and the work potential of the available energy is ex-
     pressed in numerical values.  The mass involved in the
     blast is determined by the geometry of the blast and
     by the rock density.  Time is also a relevant parameter,
     because time is required to complete the three basic
     stages of the breakage process.

     For successful application of the blasting parameters,
     the basic mechanism of the breakage process must be
     understood.
Lewis, Gordon V.

Foam Drilling-Settling the Dust.
Canadian Mining Journal, 94, No. 9, pp. 42, 48 (1973).

     Wot drilling underground has limitations.  Foam drilling
     is an approach to overcome these limitations.   Labora-
     tory tests were conducted using foam drilling.  Results
     of the tests are presented and economics of foams dis-
     cussed.
                             141

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Li, Ta M.

Dramatic Modernization Program Improves Overall Production
at Jeffrey Mine.
Engineering and Mining Journal, 174, No, 10, pp. 78-82 (1973)

     To remain  competitive in the world market in the face
     of rapidly rising mining and processing costs, techni-
     cal innovation, and larger trucks are necessary.
     Operations techniques, use, and economics of larger
     equipment are discussed.  History of the Jeffrey mine
     and future plans are summarized.


Ludeke, K. L,

Soil Properties of Materials in Copper Mine Tailing Dikes.
Mining Congress Journal, 59, No. 8, pp. 30-37 (1973).

     Environmental pollution is a major problem currently
     £acing people everywhere.  Federal and state agencies
     have both enacted legislation and are considering
     added laws for more effective pollution control.

     Present interest in pollution control has directed
     attention to the accumulation of mine, mill,and smelter
     wastes that present potential air, water, and environ-
     mental pollution hazards.  Pollution hazards associated
     with copper milling may possibly be reduced or elimin-
     ated by effective stabilization and revegetation of
     tailing disposal berms.  Pima Mining Co., as an example,
     has sought to achieve effective control of pollution
     resulting from its mining and milling operations.  In
     this connection, the company has adopted the foresighted
     policy of improving the environment, from both a physi-
     cal and public point of view, and has made financial
     resources available for the study reported on here.
     The primary objectives were to (a) make tailing dis-
     posal berms esthetically acceptable, (b) facilitate
     revegetation of such berms, (c) study the problems of
     soil structure and the chemical composition of the soil
     materials in mining wastes that may affect revegetation,
     and (d) eliminate possible environmental pollution
     problems.
                             142

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Ludeke,, Kenneth L.

Vegetative Stabilization of Tailings Disposal Berms.
Mining Congress Journal, 59, No. 1, pp. 32-39 (1973),

     The objectives of maintaining the natural desert beauty
     and of minimizing erosion and wind blown dust are being
     successfully achieved In stabilization program of
     Pima Mining Co.

     Vegetative stabilization has been successful due to
     proper planning and follow-up.  Techniques of stabiliza-
     tion are discussed,  A list of trees, shrubs, and
     grasses which have been successfully used is given.
     Costs are discussed.
Lumley, K. P. S.f Harries, P. G., and OfKelly,  F. J.

Buildings Insulated with Sprayed Asbestos:  A Potential
Hazard.
Annals of Occupational Hygiene, 14, pp. 255-257 (1971).

     In a survey of storehouses insulated with sprayed cro-
     cidolite and amosite asbestos the insulation was found
     to be damaged because it was unprotected.   Dust sampling
     tests showed that the occupants of these storehouses
     could be exposed to harmful levels of asbestos dust if
     the insulation or fallen asbestos debris was disturbed.
     It is suggested that this hazard may be controlled by
     sealing the insulation and providing means of protect-
     ing the sealed insulation against damage.


Mangold, C, A., Beckett, R. R., and. Bessmer,, D. J.

Asbestos Exposure and Control at Puget Sound Naval Shipyard.
Puget Sound Naval Shipyard, Industrial Hygiene Division,
Bremerton, Washington, (1970).

     A two and one-half year comparison of chest x-ray find-
     ings in the total work force of Puget Sound Naval Ship-
     yard shows that 21% of the Pipe Coverers and Insulators
     handling asbestos have pulmonary abnormalities compared
     to 3»570 of the Boilermakers who have some exposure to
     asbestos and silica, and less than 1% of the Clerical
     workers with no known exposure to industrial dusts.
     Pulmonary abnormalities have remained high although
     evaluation of the asbestos dust exposure of Pipe
     Coverers and Insulators shows their time weighted ex-
     posures are below the current Threshold Limit Value
     of 5 million particles per cubic foot of air.  The

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     Threshold Limit Value may be too high and intermittent
     peak exposures may play a greater role than suspected.
     A number of engineering control methods and changes in
     work practices are suggested to reduce asbestos
     exposure.


Minnick, L. John

Control of Particulate Emissions from Lime Plants -- A Survey.
Journal of the Air Pollution Control Association, 21, No. 4,
pp. 195-200 (1971).

     This paper describes the achievements of the lime indus-
     try in developing methods of handling and controlling
     the various finely divided products which they produce.
     An extensive survey provides useful data on the avail-
     ability and performance of many of the control devices
     that are currently in use, and an analysis is made of
     the operating efficiencies and costs of this equipment.
     The environmental control programs which are currently
     underway in this industry are described and an evalua-
     tion is made of these programs.  The ultimate goals
     that are believed to be attainable are presented from
     the standpoint of emission control from individual
     processes as well as from operating plant complexes.
     While the paper deals primarily with practical operating
     and engineering aspects of the subject, some information
     is also included on methods of tests and the monitoring
     systems that are in use.


Morrison,  Joseph N., Jr.

Controlling Dust Emissions at Belt Conveyor Transfer Points.
Transactions of the Society of Mining Engineers,  250, No. 1,
pp. 47-53 (1971).

     A comprehensive solution is offered to the problem of
     dust emissions at belt conveyor transfer points.  De-
     tails of enclosure design are discussed and a straight-
     forward procedure for calculating required dust control
     exhaust volume is presented.  Many design variables are
     taken into account which heretofore have been commonly
     ignored or inadequately considered.  These include belt
     widths, belt speeds,  enclosure openings,  material flow
     rate, material bulk densities,  material lump sizes,
     height of material fall, material temperature,  and am-
     bient air temperature.  All of these questions  are handled
     by means  of a "fill-in-the-blanks" type of calculation
     form, permitting quick,  reliable solutions by relative
     "non-experts".
                             144

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Newhouse, Muriel L.

Asbestos in the Work Place and the Community„
Annals of Occupational Hygiene, 16, pp. 97-107 (1973).

     The fibrogenic properties of asbestos dust were detected
     early, later knowledge accumulated about the carcinogenic
     properties of the mineral and a hazard of bronchial
     carcinoma and mesothelial tumours was recognized.

     Mortality studies have measured the effect of exposure
     on working populations.  Recent analysis of data from
     a cohort of asbestos factory workers shows that even
     with low to moderate exposure there is excess mortality
     from cancer of the lung and pleura and other cancers,
     after more than 25 years' observation.  The mesothelioma
     rate increases both with severity and length of exposure.
     Occurrence of these and other tumours appears to be
     dose-related.  The markers of a community effect of
     asbestos dust in the environment ar<-,: the occurrence of
     mesothelial tumours in neighbourhoods of a source of
     asbestos dust, and the presence of asbestos bodies or
     c&lcified asbestos pleural plaques in the general popu-
     lation „  Conditions giving rise to neighbourhood
     me:sothelial tumours may not now occur, but the impor-
     tance of adequate control in all countries where asbes-
     tos is mined or manufactured is stressed.
Nicholson, William, J., and Rohl, Arthur N.

Asbestos Air Pollution in New York City.
Proceedings of the Second International Clean Air Congress,
pp. 136-139 (1970).

     Sampling for asbestos in the ambient air of New York
     City was performed.  Preliminary results show concen-
     trations ranging from 11 to 60 x 10~" grams/nP.  In the
     vicinity of the spraying of fireproofing containing2
     asbestos materials, concentrations of 20 x 10"" g/m  were
     found upwind and concentrations of 45 to 180 x 10°*° g/ttH
     were found downwind.
Noro, Leo

Occupational and Non-Occupational Asbestosis in Finland,
American Industrial Hygiene Association Journal, 29, No, 3
pp. 195-201 (1968).

     The history of asbestos and asbestosis in Finland is
     presented.  In addition to the occupational-related
                             145

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     incidences of asbestosis, residents especially farmers
     in regions near asbestos deposits show an increased
     incidence of asbestos bodies in lung studies.


Pasquill, F.

The Estimation of the Dispersion of Windborne Material.
The Meteorological Magazine, 90, No. 1063, pp. 33-49 (1961).

     The theoretical estimation of the concentrations arising
     from sources of gaseous or finely divided particulate
     material has for long been based on treatments of atmos-
     pheric diffusion developed by Sir Graham Button.  These
     formulae are reliable for specifying the average distri-
     bution, over a few minutes on level unobstructed terrain,
     with a steady wind direction and neutral conditions of
     atmospheric stability.  Extension to other circum-
     stances has depended on empirical and often speculative
     adjustments of the diffusion parameters.

     During the last few years, investigations have shown
     that a fairly rational allowance can now be made for
     the effects of much of the wide variation in atmos-
     pheric turbulence which occurs in reality.  This progress
     includes some extension to longer distances of travel.

     The purpose of this article is to review the recent
     background of theoretical and experimental results, and
     to give details of the proposed system of calculating
     the distribution of concentration downwind of a source.
     These details are set out in two appendices, the first
     giving complete instructions for carrying out the calcu-
     lations, the second presenting an example.


Popa, Bazil, and lancau, Vasile

The Probability of Certain Concentrations in the Dispersion
of Solid Dust Particles in Industrial Regions.
Staub-Reinhaltung, der Luft, 33, No. 1, pp. 20-24 (1973).

     The measurement of particulate components in the air is
     necessary to the health of a community.  The prediction
     of concentrations of particulates is necessary for the
     planning of controls on present sources and the intro-
     duction of new industry,  i.e., new sources in the region.

     The influence of the wind is of prime importance,  not
     only its speed but its direction, is discussed.  Wind
     is a random variable and mathematical presentation
     using statistics are given.  Various distribution curves
                             146

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      (exponential, logistic, Fisher-Tippett type II (Freehent)
      and type I  (Gumbel), Cauchy, normal Laplace-Gauss) are
      compared.   The town of Cluj, Romania, is used as an
      example.


Porter, I). D.

Use of Rock Fragmentation to Evaluate Explosives for Blasting.
Mining Congress  Journal, January, pp. 41-43 (1974).

      A quantitative study of the performance of explosives
      under model shooting conditions has led to derivation
      of a mathematical relationship between fragmentation
      effectiveness of explosives and such measurable parameters
      as detonation velocity, explosive energy, density, and
      rock sonic  velocity.  Through this relationship,  one
      is accounting for parameters long known to affect the
      performance of explosives.

      Significantly, the potential now exists for dealing
      with these  parameters on the basis of their interrela-
      tionship with field loading conditions and rock pro-
      perties.  Initial field tests to develop practical ap-
      plications  of this relationship as a predictive tool
      have revealed several problematic considerations, but
      they also have demonstrated the potential for develop-
      ing a useful tool for evaluating the fragmentation ef-
      fectiveness of different explosives on a theoretical
      basis as an aid to selecting specific formulations for
      individual  jobs.


Powlesland, J. W.

Air Curtains.
Canadian Mining  Journal, 92, No, 10, pp. 84-85 (1971).

     Airflow regulators, thermal barriers, dust, and fume
     control are all accomplished with jet streams without
      the use of hoods and ducts.
Rajhans, Cyan S.

Fibrous Dust - Its Measurements and Control.
The Canadian Mining and Metallurgical Bulletin, 63, No. 8,
pp. 900-910 (1970).

     The strategy of fibrous dust sampling is discussed,
     va.rious sampling methods are critically reviewed and
     their application to coal dust is demonstrated.  Fiber
                             147

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     counting is described in detail.  An attempt is made to
     explain the basis of determining the threshold limit
     value of asbestos and other dusts.

     The paper also discusses such dust control methods as
     enclosure of the process, effective local exhaust ven-
     tilation, segregation, substitution, wet processing, and
     continuous monitoring of the return air for recirculation.


Randveer, Elmar

Tangential Blowers in Dust Control.
Canadian Mining Journal, 92, No. 10, p. 29 (1972),

     Dumping of ore into the crusher pocket is a major source
     of dust.  Tangential blowers were installed at Ecstall
     Mining, Ltd., to solve this problem.  The air curtain
     system together with the dust collection equipment is
     described.  Tests on the actual installation show an
     efficiency of 85 to 907= suppression of dust.


Reltze, William B», Nicholson, William J., Holaday, Duncan A.,
and Selikoff, Irving J.

Application of Sprayed Inorganic Fiber Containing Asbestos;
Occupation Health Hazards.
American Industrial Hygiene Association Journal, 33, No. 3,
pp. 178-191 (1972).

     Over 40,000 tons of inorganic fibrous insulation con-
     taining asbestos were used in 1970 by the construction
     industry as a fireproofing material in the erection of
     multistoried buildings..  The application of this material
     by a spraying technique produces serious contamination
     of the working environment.  Asbestos fiber concentra-
     tions may range from 30 f/cc to more than 100 f/cc.
     Some early observations of the exposures and health of
     the workmen in this comparatively new occupation are
     given with photographs of the working areas.  Nearby-
     workers may be indirectly exposed.  Such concentrations
     were found to be 70 f/cc ten feet from the spraying
     and 46 f/cc seventy-five feet away.  Control measures
     are discussed.
                            148

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ReitzeSl William B., Holaday, D. A., Romer, Harold, and
Fenner, E. M.

Control of Asbestos Fiber Emissions from Industrial and
Commercial Sources,
Proceedings of the Second International Clean Air Congress,
pp. 100-103 (1970).

     There are five major sources from which asbestos fiber
     enters the air --  (1) mining, (2) milling  (3) manufac-
     turing,  (4) certain segments of the construction indus-
     try, and (5) naturally occurring sources.  The first
     four are created by modern man's technology and the last
     by normally occurring changes in our environment.

     The operations of  each source with controls that are
     now in use are listed.


Roach, S. A,

Hygiene Standards for Asbestos.
Annals of Occupational  Hygiene, 13, pp. 7-15 (1970).

     Criteria for establishing the standards for asbestos
     is discussed.  The dose response of individuals and
     population is presented in general and the response to
     ehrysotile asbestos exposure is plotted.  The accumu-
     lated exposure of  100 fibers years/cm^ is the threshold
     to limit early clinical signs to 1% of the population.
     This exposure-response, as it is related to the present
     exposure limits,  is discussed.
Scharf,  Allan

Preliminary Report on Reduction of Airborne Dust Produced
by Pneumatic Jackhammers.
American Industrial Hygiene Association Journal, 28, No. 5,
pp. 479-481 (1967).

     j-ii preliminary findings, the use of a new continuous
     flow water attachment for jackharnmers has shown en-
     couraging results in its dust suppression capabilities.
     This attachment reduces airborne sandstone dust concen-
     trations rather than precipitate the dust once airborne,
     Using Student's "t" test the difference between the
     means for wet conditions were compared with dry jack-
     hammering.  These differences were highly significant
     in 8 trenches, significant in 2 trenches, and no signi-
     ficant in 1 trench.  It is concluded that further de-
     velopment of the water attachment is in order.
                             149

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Seharf, Allan

Control of Airborne Dust Produced by Pneumatic Jackpicks:
Report Number II.
American Industrial Hygiene Association Journal, 30, No. 5,
pp. 519-522 (1969).

     This report concerns analyses of data collected from
     48 excavation sites at which a cone-shaped continuous
     flow water attachment for jackpicks was in use.  The
     attachment reduces airborne sandstone dust concentra-
     tions rather than precipitate the dust once airborne.
     This testing of the attachment supported original
     findings concerning its favorable dust suppression
     capabilities.  The superiority of placing the cone
     near the pickpoint at commencement of picking over
     placing the cone a remote distance from the pick point
     is demonstrated.  No correlation between dust concen-
     trations and trench depth was found during dry picking,
     Under wet picking conditions,  a correlation was found.


Scharf, Allan

Control of Airborne Dust Produced by Pneumatic Jackpicks
with Water Attachments:  Report III.
American Industrial Hygiene Association Journal, 33, No. 1,
pp. 48-53 (1972).

     The dust suppression capabilities of a cone-shaped
     water attachment for pneumatic jackpicks (Mark 3) was
     compared with similar capabilities of a coil-shaped
     attachment (Mark 4).  The Mark 4 design, in the field,
     significantly reduced hazardous sandstone dust concen-
     trations when compared with the Mark 3 (Student's "t"
     test, P < 0.02).  The Mark 4 used significantly less
     water (Student's "t" test, P < 0.01).  There is a ten-
     dency for the percentage of decrease in dust to be'
     associated with the percentage of the water reaching
     the impact point of the jackpick steel.
Scharf, Allan

Control of Airborne Dust Produced by Pneumatic Jackpicks:
Report IV.  Calibration of Water Attachments,
American Industrial Hygiene Association Journal, 34,  No.  4,
pp. 171-175 (1973).

     The rates of water flow were measured from the impact
     point of a jackpick steel fitted with a cone-shaped
     Mark 3 and a coil-shaped Mark 4 water attachment.   The
                             150

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     Mark 4 more consistently distributed water to the pick
     point with the coil in an up and down position than the
     Mark 3.  In addition, the percent of water reaching the
     impact point of the jackpick steel (at different set
     ra.tes of water flow, from different water attachments)
     could be expected to demonstrate the optimum rate of
     flow for each attachment tested.
Schutz, L. A., Bank,, Walter, and Weems, George

Airborne Asbestos Fiber Concentrations in Asbestos Mines
and Mills in the United States.
Bureau of Mines Health and Safety Program, No, 72, Washington,
D. C. (1973).

     Personnel of the Bureau of Mines have conducted inves-
     tigations in the principal asbestos mines and mills in
     the United States, to determine the concentration of
     airborne asbestos fibers in the workplace, and to estab-
     lish the exposure of workers to such fibers.  The sur- .
     veys were conducted using the sampling and evaluation
     method recommended by the National Institute for Occu-
     pational Safety and Health.  The method consists of
     collecting the airborne sample on filters and, after
     appropriate sample preparation, counting the fibers
     utilizing phase contrast microscopy.  The results of
     the investigation show that fiber concentrations are
     low in the asbestos mines but high in the asbestos
     mills, ranging well above 5 fibers/ml of air based on
     a count of fibers greater than 5 M-m in length.


Selikoff, I. J., Hammonds E, C., and Heimann, H,

Critical Evaluation of Disease Hazards Associated with
Community Asbestos Air Pollution,
Proceedings of the Second International Clean Air Congress,
pp. 165-171 (1970).

     The results of 3,000 consecutive autopsies in New York
     City is correlated with asbestos bodies.  The results
     of sampling the ambient air of New York City show an
     asbestos air level of 11 to 60 x 10~° g/m-^.   Types of
     exposure as well as sources and control methods are
     discussed.
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Shore, D. V.

Current Blasting Trends in Open-Pit Mining and Quarrying.
Australian Mining, 64, No. 10, pp. 20-21, 25 (1972),

     The dominant trend in open-pit mining and quarrying in
     Australia is the increased outputs from individual
     locations.  This article outlines the importance of
     new explosives technology in the trend and the kinds
     of blasting found suitable for the various locations.
Simecek, Jaroslar

Dust Investigations in an Asbestos-Processing Plant and
Its Surroundings„
Staub-Reinhalt der Luft, 31, No. 12, pp. 26-31 (1971).

     In an asbestos processing plant dust concentrations
     were determined at working places and also in the plant
     surroundings.  The individual working places can be
     assessed on the basis of results obtained by measure-
     ments carried out from 1965 to 1969.  The measurements
     effected outside the plant buildings have shown that
     the maximum value of 0.15 mg/m^ was exceeded in the
     summer months in 20% of the cases, and in the winter
     months in 50% of the cases.  The asbestos particles
     present in samples are detected under the electron
     microscope.  The particle size distribution and concen-
     tration (1.7 particles/cm3), and also the asbestos
     content (<1 weight %),  were determined.


Skidmore, E. L.

Assessing Wind Erosion Forces:  Direction and Relative
Magnitudes,
Soil Science Society of America Proceedings, 29,  No. 5,
pp. 587-590 (1965).
                                                     *
     Wind erosion force vectors were computed from data of
     frequency of occurrence of directions by windspeed
     groups based on wind erosion being proportional to
     windspeed cubed times the duration of the wind.  The
     vectors were obtained by evaluating S_JJj_  ^1 ^or eac^-
     of the 16 principal directions where Uj*^ is  the cubed
     mean windspeed within the ith speed group and f^ is
     percentage of total observations that occur  in the
     speed group and direction under consideration.

     The wind erosion force vectors were used to  compute
     monthly magnitudes of the total wind erosion forces and
     direction where the ratio of the wind erosion forces
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     parallel and perpendicular to that direction is a maxi-
     mum.  The computed direction indicates proper orienta-
     tion of a wind barrier for maximum barrier protection,
     The magnitude of the ratio gives the preponderance of
     wind erosion forces in the direction of maximum wind
     erosion forces.  The magnitude of the total wind erosion
     forces indicates the potential need for protection
     against the erosion forces.


Skidmore,, E. L., Fisher, P. S., and Woodruff, N. P.

Wind Erosion Equation:  Computer Solution and Application.
Soil Science Society of America Proceedings, 34, No. 6,
pp. 931-935 (1970).

     A wind-erosion equation was programmed for computer
     solution.  The relationships among variables are
     evaluated by the computer and the general functional
     relationship between soil loss and independent  vari-
     ables, E - f(I', C', K', L', V), is solved stepwise to
     give potential average annual soil loss, E, in tons
     p€:r acre per annum for specified conditions of credi-
     bility, I'; roughness, K'; climatic factor, C';
     equivalent field length, L'; and equivalent vegetative
     cover, V.  The computer also can solve the equation to
     determine field conditions necessary to reduce potential
     erosion to a tolerable amount and can compare the effec-
     tiveness of various combinations of erosion-control
     treatments.
Sullivan,, Ralph J., and Athanassiadis, Yonis C.

Air Pollution Aspects of Asbestos.
National Air Pollution Control Administration, No. PH-22-68-25,
Washington, D.C, (1969).

     Inhalation of asbestos may cause asbestosis, pleural or
     peritoneal mesothelioma, or lung cancer,  Mesothelioma
     is a rare form of cancer which occurs frequently in
     asbestos workers.  All three of these diseases are
     fa.tal once they become established.  The dose neces-
     sary to produce asbestosis has been estimated to be
     50 to 60 million particles per cubic foot-years.  No
     information is available on the dose necessary to in-
     duce cancer.  Random autopsies of lungs have shown
     "asbestos bodies" in the lungs of one-fourth to one-half
     of samples from urban populations.  Thus, the apparent
     air pollution by asbestos reaches a large number of
     people.
                             153

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     Animals have been shown to develop asbestosis and can-
     cer after exposure to asbestos.

     No Information has been found on the effects of asbestos
     air pollution on plants or materials.

     The likely sources of asbestos air pollution are uses
     of the asbestos products in the construction industry
     and asbestos mines and factories.  Observations in
     Finland and Russia indicate that asbestos does pollute
     air near mines and factories.  However, no measurements
     were reported of the concentration of asbestos near
     likely sources in the United States.  A concentration
     in urban air of 600 to 6,000 particles per cubic meter
     has been estimated.

     Bag filters have been used in factories to control
     asbestos emissions; the cost of this type of control in
     a British factory was approximately 27.5 percent of the
     total capital cost and about 7 percent of the operating
     cost.  No information has been found on the costs of
     damage resulting from asbestos air pollution.

     No satisfactory analytical method is available to
     determine asbestos in the atmosphere.
Turner, D. Bruc e

Workbook of Atmospheric Dispersion Estimates.
National Air Pollution Control Administration, Cincinnati
(1970).

     This workbook presents methods of practical application
     of the binormal continuous plume dispersion model to
     estimate concentrations of air pollutants.  Estimates
     of dispersion are those of Pasquill as restated by
     Gifford.  Emphasis is on the estimation of concentra-
     tions from continuous sources for sampling times up to
     one hour.  Some of the topics discussed are determina-
     tion of effective height of emission, extension of
     concentration estimates to longer sampling intervals,
     inversion break-up fumigation concentrations, and con-
     centrations from area, line, and multiple sources.
     Twenty-six example problems and their solutions are
     given.  Some graphical aids to computation are included.
                             154

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Wood, C. H,, and Roach, S. A.

Dust in Card Rooms:  A Continuing Problem in the Cotton-
Spinning Industry.
British Journal of Industrial Medicine, 21, No, 3, pp. 180-186
(1964).

     The results are given of environmental and clinical
     investigations in four card rooms where one of the
     latest systems of exhaust ventilation to control dust
     has been installed.  The concentration of airborne
     coarse dust particles, larger than 2 mm, was reduced
     by between 80% and 90% around the carding engines.
     The card rooms consequently looked less dusty.  However,
     the concentrations of medium and fine sized dust par-
     ticles were not always reduced and were actually in-
     creased in some places.  In one mill, when the new con-
     trol system had been running for three years, there
     was found to be no reduction in the prevalence of non-
     specific chest symptoms, and there was an increase in
     the number of those with chest tightness on Mondays, a
     symptom characteristic  of byssinosis.  Evidence is
     given of a similar failure to reduce the dust suffi-
     ciently in three other mills where the same exhaust
     system is installed.

     There is an urgent need to extend the limited investi-
     gations reported here to a larger number of mills.
     Meanwhile there is a continuing morbidity and mortality
     from byssinosis.  Until work in card rooms has been
     made safe and proved to be so, it is necessary to have
     regular measurement of dust conditions and for the
     workers to have periodical medical examinations to
     enable managements to be advised about the hazards in
     their mills and advice to be given to the individuals
     affected by the dust.


Woodruff, N. P., and Siddoway, F. H.

A Wind Erosion Equation.
Soil Science Society of America Proceedings, 29, No. 5,
pp. 602-608 (1965).

     The amount of erosion, E, expressed in tons per acre
     per annum, that will occur from a given agricultural
     field can be expressed in terms of equivalent variables
     as:  E = f(I', K', C', I/, V) where I' is a soil credi-
     bility index, K' is a soil ridge roughness factor, C'
     is a climatic factor, L' is field length along the pre-
     vailing wind erosion direction, and ¥ is equivalent
     quantity of vegetative cover.  The 5 equivalent variables
                             155

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are obtained by grouping some and converting others of
the 11 primary variables now known to govern wind
credibility.  Relations among variables are extremely
complex.  Charts and tables have been developed to
permit graphical solutions of the equation.  The equa-
tion is designed to serve the twofold purpose of pro-
viding a tool to (i) determine the potential erosion
from a particular field, and (ii) determine what field
conditions of soil cloddiness,  roughness,  vegetative
cover, sheltering by barriers,  or width and orientation
of field are necessary to reduce potential erosion to
a tolerable amount.  Examples of these applications of
the equation are presented.  Weaknesses in the equation
and areas needing further research are discussed.
                        156

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                     Appendix B
ABSTRACTS OF CURRENT, RELATED RESEARCH PROGRAMS UNDER
   SPONSORSHIP OF THE DEPARTMENT OF THE INTERIOR,
         BUREAU OF MINES, WASHINGTON, B.C.
                        157

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    ABSTRACTS OF CURRENT, RELATED RESEARCH PROGRAMS UNDER
       SPONSORSHIP OF THE DEPARTMENT OF THE INTERIOR,
             BUREAU OF MINES, WASHINGTON, B.C.


Troy Achenback
"A Feasibility Study on the Use of Foam to Reduce Respirable
Coal Dust on a Joy 10 CM Continuous Miner"
Agency No. 03388
Peabody Coal Company, Pawnee, Illinois

                          Abstract

     The contractor shall conduct a program to ascertain the
effectiveness of a foam system in reducing the amount of
respirable coal dust generated during an actual mining
operation.  Nozzles will be mounted on a Joy 10 CM continuous
miner and tests will be conducted in Peabody's No. 10 mine,
Pawnee, Illinois.  Peabody Coal Company will test underground
for 40 shifts, preferably at a rate of two shifts per day,
alternating daily between foam and water so that the sampling
results of 20 shifts with foam can be compared with an
equivalent 20 shifts of water.
L. Cheng
"Dust Control at and Outby the Face"
Agency No. 03159
Pittsburgh Mining and Safety Research Center
  4800 Forbes Avenue, Pittsburgh, Pa. 15213

                          Abstract

     A theoretical model for the capture of airborne dust
was developed and verified in the laboratory.  The theory
can be used to select a spray nozzle which gives spray drops
having a higher collection efficiency of airborne dust at a
specific spray-nozzle location in a mine for the water flow
rate, line pressure, and geometry at that location.  In
practice, of course, the water spray drops can also impact
and moisten the surface of the coal and prevent dust from
becoming airborne.  The development of a theoretical impac-
tion model is being studied,  and combination of the impaction
and airborne models will then be attempted.

     In the interim, the usefulness of the above airborne
theory for improved dust suppression at the front end of a
continuous mining machine was tested underground.  In one
test series,  "good" sprays gave one-third less dust than
other water sprays and also used one-third less water.  In a
second test series, dust suppression was about equal with all
spray nozzles, although the good sprays still used about
one-third less water.


                             158

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J. B. Cheung
"Surface Hard Rock Excavator to Reduce Environmental Impact
of Drilling and Blasting"
Agency No. 9500 - 1.2
Twin Cities Mining Research Center, P.O. Box 1660,
  Twin Cities, Minn. 55111

                          Abstract

     Develop and test a new surface hard rock excavation
system as an alternative to the conventional quarrying prac-
tice.  Field testing of the thermal-mechanical breaking
method both for in-situ breaking and secondary crushing of
hard rocks will be carried out.  The effect of geology and
rock property variations on the method will be determined.
The environmental impact and economic assessments of both
the thermal and conventional (drilling and blasting) methods
will be made to establish the relative advantages and cost
effectiveness of the thermal excavator.  The results will
provide engineering data for the design of a thermal exca-
vator system for full-scale experimental demonstrations.
John B. Cheung
"Thermal Fragmentation Methods for In-Situ and Secondary
Crushing of Hard Rocks"
Agency No. 9500 -1.9
Twin Cities Mining Research Center, P.O. Box 1660,
  Twin Cities, Minn. 55111

                          Abstract

     This project will evaluate the process efficiency of
different surface heating methods to achieve thermal frag-
mentation and size reduction of hard rocks.  A mechanically
assisted process of fracture completion and fragment removal
will be examined and the process efficiency of a thermo-
mechanical combination method of rock fragmentation will be
evaluated during FY 1972,  An experimental study will be
made to evaluate the thermal shock concept for size reduc-
tion of rocks.  The energy coupling efficiency for surface
heating and fragmentation of hard rocks will be examined.
                              159

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W. G. Courtney
"Dust Control Technology"
Agency No. 03406
Pittsburgh Mining and Safety Research Center,
  4800 Forbes Avenue, Pittsburgh, Pa. 15213

                          Abstract

     The objective is to obtain background information for
improving the Bureau's dust enforcement program for the non-
coal mining industry.  Exploratory field information on dust
concentrations using an assortment of dust samplers will be
obtained.  In addition, the time variation in dust levels
and the validity of the present Bureau sampling system will
be investigated.
Walter W. Fowkes
"Reclamation of Spoil Banks"
Agency No. 8751-4140
Grand Forks Energy Research Laboratory, Box 8213,
  University Station, Grand Forks, N.D, 58201

                          Abstract

     A survey will be conducted of current efforts on spoil
bank reclamation from strip mining by major mining companies
in areas of North Dakota, eastern Montana, and eastern Wyoming,
Based on this information, examine further the soil charac-
teristics and types of indigenous vegetation so as to identify
opportune sites for field studies.  At selected sites, in-
corporate combustion products and/or coal into the soil after
a minimum of topographic preparation; then, seed or plant
and observe along with control plots.

     Growth response and self-sustaining character of the
revegetation efforts will be examined in relation to age of
spoils, micronutrient availability, and changes in physical
properties of the soil effected by various amendments.
                             160

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 J.  N.  Frank
 "Augmentation  of  Mechanical Coal Miner with Fluid Jets"
 Agency No. 8931 - 1.2
 Twin Cities Mining Research Center, P.O. Box 1660,
  Twin Cities, Minn. 55111

                          Abstract

     Fluid jets will be  installed on a mechanical coal miner
 to  determine if the amount of respirable dust generated by a
 mining machine can be reduced or suppressed and if the coal
 extraction rate can be improved.  The testing program will
 utilize the microminer,  built by Battelle Columbus Laboratories
 under  a H&S contract, and a fluid jet system capable of pres-
 sures  up to 30,000 psi.  Measurements will be made of the
 amount of respirable dust generated and the extraction rate
 during coal cutting tests in the Center's large-scale testing
 laboratory.  Field tests at an opencast coal mine will be
 started late in FY 1974  and continued in FY 1975 to assess
 this method under field  operating conditions.
R. A. Friedel
"Air Pollution from Mining and Processing (NASA)"
Project; Nos. 5556 and 5557
Pittsburgh Energy Research Center, 4800 Forbes Avenue,
  Pittsburgh, Pa. 15213

                          Abstract

     Photographic and instrumentation methods are used to
ascertain ecological damage -- destruction of foliage, strip
mining scars, pollution of rivers and lakes, air pollution
from mineral processing, etc.
D. W. Gillmore
"Reclamation of Coal Mining Waste Areas"
Agency No. 4-1161
Morgantown Energy Research Center, Morgantown, W.V. 26505

                          Abstract

     Purpose:  To demonstrate the physical and chemical
benefits of using power-plant fly ash in the reclamation and
revegetation of surface mine spoil and coal mine disposal
areas.

     Consulting and some machine services will be provided
on a variety of cooperative projects, particularly those on
                             161

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refuse bank reclamation and in reclaiming anthracite culm
banks.

     Newer fly ash application and mixing techniques, such
as hydraulic injection for high walls and out slopes, rock
crushing and pulvimixing will be investigated.
Ralph Hiltz
"Underground Application of Foam for Suppression of
Respirable Dust"
Agency No. 03349
MSA Research Corporation, Evans City, Pa.

                          Abstract

     Dust suppression is still a problem in some continuous
mining applications, but especially so in low coal auger
mining and long wall systems.  Previous tests have offered
sufficient encouragement to warrant further investigation
into the suppression of respirable dust at the face by means
of high expansion surfactant foam.  This contract will test
foam application on two continuous miners in high coal in
two different coal seams, one of which contains rock partings,
a low coal auger miner, and a long wall shearer section.
Also, the effect of the surfactant foam on the dust generated
by secondary handling will be evaluated simultaneously.
Dennis H. Irby
"Respirable Dust Abatement"
Agency No. 4088 - 2.1
Twin Cities Mining Research Center, P.O. Box 1660,
  Twin Cities, Minn. 55111

                          Abstract

     This project deals with two of the health hazards in
metal and nonmetal mining associated with rock drills, res-
pirable dust and drilling noise.  The objective is to devise
means of measuring respirable dust and noise generated by
rock drills and to determine the relationship of rock and
drill parameters to these hazards.  Significant parameters
that would minimize these hazards will be sought.
                             162

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C. D, Kealy
"Design Theory - Coal Waste Dumps"
Agency No. 8783-1
Spokane Mining Research Center, N. 1430 Washington St.,
  Spokane, Wash. 99201

                          Abstract

     Purpose:  Develop new design criteria and theory for
surface;-waste disposal (coal and metal-nonmetal) including
investigations into disposition of tailings and coal sludge,
slope stability, fill stabilization, air/water pollution, and
land reclamation.  Both static and dynamic analysis will be
pursued as well as nonsaturated flow.  Define, analyze, and
develop solutions for disposal of waste products from all
types of mining operations.
J. M. Link
"Feasibility of Hydraulic Transportation in Underground
Coal Mines"
Agency No. 03348
Colorado School of Mines Research Institute, P.O. Box 112,
  Golden, Colorado 80401

                          Abstract

     The purpose of this research is to design a total mine
hydraulic pipeline system that is fail-safe and design each
of the hydraulic pipeline subsystems for conveying run-of-
mine coal (including normal refuse content) from continuous
mining machines to a surface loading point or preparation
plant.  It is to determine the economic potential and cal-
culate capital, operating, and depreciation cost estimates
for this system and each subsystem.  The subsystems are face
haulage, multiple feed secondary haulage, and vertical
hoisting.  In addition, costs will be calculated for conven-
tional haulage subsystems such as shuttle car, conveyor
belt, rail, and skip hoisting.
                              163

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F. E, McCall
"Investigate the Effectiveness of Water Stemming as a Means
of Suppressing Respirable Dust Resulting from Explosive
Fragmentation of Coal"
Agency No. 03160
Pittsburgh Mining and Safety Research Center,
  4800 Forbes Avenue, Pittsburgh, Pa. 15213

                          Abstract

     A Bureau study showed that coal mine personnel involved
in conventional mining are exposed to about the same amount
of respirable dust as similar personnel involved in continu-
ous mining.  Dust control techniques therefore must be
developed for conventional mining operations.

     One source of respirable dust during conventional mining
is the blasting operation.  The objective of this program
was to investigate the effectiveness of water and Trabant
gel compared to dry clay as stemming materials for controlling
the formation of respirable dust.

     The investigation shows (1) no significant difference
between the amount of airborne respirable dust generated
using water or gel as the stemming material, (2) both the
gel and water give about 70 percent less respirable dust
than was obtained with dry clay as a stemming material, and
(3) reentry time with gel or water was immediate while
smoke lingered for several minutes with dry clay.  Most of
the airborne dry-clay-stemmed respirable dust was dry-clay
dust.  Negligible amounts of CO and NOn were observed with
all stemming materials.
S. J. Rodgers
"Experience Survey of Dust Control Methods in Noncoal Mines"
Agency No. 03281
MSA Research Corporation, Evans City, Pa.

                          Abstract

     The contractor will conduct a detailed survey of past
and present engineering methods used to control respirable
dust in the noncoal mining industries and also will identify
dust control problem areas.  Dust control methods in asbestos,
bentonite, copper, talc, uranium, lead, iron, gold, molybdenum
and crushed-stone mines, quarries, and ore processing mills
will be included.  The program will include a search of exist-
ing literature and personal contacts with the major mining
companies and companies specializing in dust control equip-
ment.  The survey will include established procedures that
                             164

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are in widespread use throughout the mining industry but also
will include any unique methods which may be found.  The
findings will be assembled in a systematic manner as a final
report which is to include a manual of dust control techniques
which can be used by mine operators.
R, L. Soderberg
"Design Criteria for Mine and Mill Waste Disposal Systems"
Agency No. 8783 - 6.1
Spokane Mining Research Center, N. 1430 Washington St.,
  Spokane, Wash. 99201

                          Abstract

     Purpose:  Study, define, analyze, and develop solutions
for disposing of waste products from the mining of large,
low-grade ore deposits.

     Problems with surface disposal of tailings will be
materifitl segregation, water movement, stabilization, effect
of topographic conditions, and effect of surface or under-
ground water.  The mining of large, low-grade ore deposits
will only be possible through the handling of large amounts
of material, and the resultant large quantities of waste
products must be adequately disposed of.
R. F, Stewart
"The Pneumatic Transportation of Coal"
Agency No, 07023
Morgantown Energy Research Center, P.O. Box 880,
  Morgantown, W.V. 26505

                          Abstract:

     The objective is to determine the technical and economical
feasibility of pneumatically transporting mine-run coal from
the working face to the surface.

     Horizontal vacuum tests were completed; and empirical
equations that correlate minimum air and power requirements
with coal throughput rate, pipe diameter, and specific gravity
of the coal were derived.  The highest haulage rate achieved
experimentally was 18 tons per hour of 1-inch coal of 1.4
specific gravity through 370 feet of 6-inch-diameter pipeline.
The minimum air rate at pickup was 814 actual cfm and the
total pressure drop 7 inches of mercury.  Extrapolation of
the equations indicates that 155 tons per hour of 4- by 0-inch
coal of 1.4 specific gravity can be vacuum transported
                            165

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through 200 feet of straight 12-inch-diameter pipeline with
a pressure drop of 10 inches Hg and a minimum air rate of
5,470 actual cfm or a theoretical horse-power requirement
of 154,

     Horizontal pressure and vertical pressure tests were
completed, and the data are being evaluated.  Cost analyses
for installation and use of pneumatic transport systems in
underground coal mines are being performed.
K. Thirumalai
"Fragmentation and Fusion Cutting of Hard Rocks Using a
Combination Thermohydraulic Process"
Agency No, 9500 -,3.1
Twin Cities Mining Research Center, P.O. Box 1660,
  Twin Cities, Minn. 55111

                          Abstract

     The purpose of this study is to examine a new concept of
continuous hard rock excavation by combining the advantages
of the thermal and hydraulic processes of rock disintegra-
tion and to conduct laboratory and in-situ tests to examine
the potential of the concept for hard rock excavation.
During FY 1972, a basic understanding of the combination
method of rock disintegration will be developed and its
application for hard rock mining will be examined.
R. P. Vinson
"Control of Respirable Dust by Water Infusion"
Agency No. ICIS 03007
Pittsburgh Mining and Safety Research Center,
  4800 Forbes Avenue, Pittsburgh, Pa, 15213

                          Abstract

     The objective of this program is to evaluate the dust
suppressing ability of water infusion.  Closely associated
with this is the development of safe and efficient infusion
procedures that are applicable to mines and mining methods
of the United States.  To fulfill these goals, water infusion
studies are being conducted in the active sections of mines
working different coalbeds.  Water flooding experiments have
been conducted in both the Pittsburgh and Pocahontas No. 3
coalbeds.  Future plans are to experiment with water infusion
in the Lower Freeport and Upper Kittanning coalbeds,
                             166

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H. W. Zeller
"Airborne Dust Control"
Agency No. 8931 - 4.1
Twin Cities Mining Research Center, P.O. Box 1660,
  Twin Cities, Minn. 55111

                          Abstract

     Research on the effects of the use of foam or mist to
capture: airborne dust generated by a percussive rock drill
will be completed during FY 1974.

     The main effort in FY 1974 will be the assessment of
dust hazards in surface and underground metal and nonmetal
mines.  The objective of this research is to quantitatively
identify dust hazards associated with mining operations with
particular emphasis on underground mining.  Extensive onsite
dust assessments will be performed to identify and classify
airborne dust hazards.

     The information obtained will be used to identify points
of dust generation or liberation where the state-of-the-art
dust control technology is not adequate to maintain air
quality at the levels specified by law.  These results will
then be input for the FY 1975-1976 effort to provide industry-
wide solutions to metal and nonmetal dust hazards.
                            167

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               Appendix C
POLLUTANT CONCENTRATION FORMULAE FOR THE
     CLIMATOLOGICAL DISPERSION MODEL
                   168

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          POLLUTANT CONCENTRATION FORMULAE FOR THE
               CLIMATOLOGICAL DISPERSION MODEL
1.   POLLUTANT CONCENTRATION FORMULAS

     The pollutant concentration formulas used in the

Climatological Dispersion Model are based on the Gaussian
plume formula.

     The average concentration CA due to area sources at a

particular receptor is given by
          JT  _
          CA ~
               16
 16         6   6
 2  qk(p)  2   S  §(kJl,m)S(p,z;U  P
k-1  k    1=1 m=l                *  m
        dp
    ,n


(Cl)
where

                k = index identifying wind direction sector

                  =   Q(p,6) d8 for the k sector
           Q(p»6) *= emission rate of the area source per unit
                    area and unit time

                p » distance from the receptor to an infinitesi-
                    mal area source

                6 — angle relative to polar coordinates cen-
                    tered on the receptor

                JL - index identifying the wind speed class

                m = index identifying the class of the Pasquill
                    stability category

         $(kf£,in) ™ joint frequency function

     S('o,z;U.,P ) = dispersion function defined in Equations
            *  m    C3 and C4

                z «= height of receptor above ground level

               U  = representative wind speed
                Mt

               P  = Pasquill stability category
                            169

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     For point sources, the average concentration C  due to
n point sources is given by


          C  -
           P

where
                   5   r   I
                   i,   4>   fc
                      j|-l o-l
                                      (C2)
                n
wind sector appropriate to the n
point source

                      th
                                                    th
               G  = emission rate of the n   point source
               p  - distance from the receptor to the n
                                                       th
                n
                    point source

     If the receptor is presumed to be at ground level,

that is, z - 0, then the functional form of S(p,0;U ,P ) will
                                                   Mi  "*
be
                                     exp
                        f
               exp
                     vT/2 /
                                   (C3)
if ff-(p) < 0.8 L and
                                                       (C4)
if G"z(p) > 0.8 L,  New terms in Equations C3 and C4 are
defined as follows:

                  = vertical dispersion function,  i.e., the
                    standard deviation of the pollution con-
                    centration in the vertical plane

                  - effective stack height of source distri-
                    bution,  i.e., the average height of area
                    source emissions in the k"1 wind direction
                    sector at radial distance p from the
                    receptor
                             170

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                L = the afternoon mixing height
             I-, /« = assumed half life of pollutant, hours
     The possibility of pollutant removal by physical or
chemical processes is included in the program by the decay
expression exp  (-0.692p/U T, i^},
     The total  concentration for the averaging period is the
sum of concentrations of the point and area sources for that
averaging period.

2.   METEOROLOGICAL PARAMETERS
     2.1  Joint Frequency Function
     It is necessary to have information on the joint fre-
quency function f(k,i,m) as input for the model.  This func-
tion gives the joint frequency of occurrence of a wind direc-
tion sector k,  a wind speed class A, and a stability category
index m.  There are 576 entries in the table for the joint
frequency function.  This number of values results from the
16 different wind vectors, 6 wind speed classes, and 6 sta-
bility classes used in determining the frequency function,
     Weather observations are taken hourly by meteorologists
of the National Weather Service at airports serving major
urban areas.  In most circumstances, this weather data will
be representative of the meteorological conditions of adja-
cent urban areas.  This weather information for localities
throughout the United States can be obtained from the National
Climatic Center (NCC) located in Asheville, North Carolina.
The revised version of the NCC program called STAR gives the
proper form of the joint frequency function.  The relation
between the Pasquill-Gifford Stability classes and those
used in the Climatological Dispersion Model are shown in
Table CL.
                            171

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                          Table Cl
             PASQUILL-GIFFORD AND CLIMATOLOGICAL
             DISPERSION MODEL STABILITY CLASSES
          Pasquill-Gifford                   Pm
                                             1
                                             2
                                             3
                                             4
                                             5
     The wind speed U for the various weather bureau classes
(Table C2) is taken as the central wind speed of the class.
It should be noted that the central wind speed of the lowest
wind speed class was arbitrarily taken as 1.5 meters per
second.  (1.30 m/sec when wind speeds are reported in miles/
hour rather than in knots.)  This means that light winds
reported in the first wind speed class were rounded up to
this value, since most operational wind instruments are de-
signed for durability and also to windstand exposure to
strong, gusty airflow.  For these reasons,  most wind sensors
have a high starting speed, which can lead to the erroneous
reporting of light winds as calms.
     2.2  Wind Profile
     To account for an increase of wind with height above a
height of 10 meters (anemometer height) to the level of
emission, a power law relation of the form
          U(z) = Uj (z/Z())p                            
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         Table C2
    CENTRAL WIND SPEEDS
Wind Standard
Speed Weather Bureau
Class Class (knots)
1 0-3
2 4-6
3 7-10
4 11-16
5 17-21
6 >21
Class
Wind Standard
Speed Weather Bureau
(m/sec) Class (mph)
1,50
2.46
4,47
6,93
9.61
12,52
0-3
4-6
7-10
11-16
17-21
v21
Class
Wind
Speed
(m/sec)
1.30
2.14
3.88
6.02
8.35
10.90
         Table C3
EXPONENTS FOR WIND PROFILE
                 t Exponent
 Stability class i     P
        1
        2
        3
        4
        5
0,1
0.15
0.20
0.25
0.25
6
i
0.30
             173

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     2,3  Mixing Height
     The magnitude of the mixing height undergoes considerable
diurnal, seasonal, and annual variation.  It is Impractical
to account for all such variations in detail.  Nevertheless,
some recognition is given to changes in the magnitude of the
mixing height by assigning values to different stabilities
according to Table C4.  In Table C4, HT is the climatological
mean value of the mixing height and HMIN is the nocturnal
mixing height.


                          Table C4
                        MIXING HEIGHT
           Stability class'Mixing heightT meters
               1
               2
               3
               4 day
                 night
               5
               6
  1.5 x HT
     HT
     HT
     HT
(HT + HMIN)/2
    HMIN
    HMIN
     2.4  Stability Classes
     The lower layer of the urban atmosphere is generally
more unstable than is the corresponding adjacent rural at-
mosphere.  To account for this, modifications have been made
to the stability class applied in the calculation of concen-
tration from area sources.  This modification consists of
decreasing the stability class by one class with the exception
                             174

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of P., which is unaltered.  This correction is not applied to
point sources.
     During the night, with a surface inversion condition and
a rural class stability of PC, the neutral stability class P,
is assumed for both point and area sources.  Otherwise, there
is no modification of the stability classes applied to point
source calculations.
     2.5  Dispersion Functions
     An analytical approximation to the curves of Pasquill
                                                  jJU
and Gifford (these curves are reproduced by Turner ) for the
vertical dispersion function a (p) is made by using an em-
                              £j
pirical power law in the form

          erz(p> - apb                                  (C6)

The parameters a and b for various stabilities and ranges of
distance p are given in Table C5.
     An initial value of the dispersion function cr_(Q) is
                                                  Z
used in the program to represent the vertical dispersion
created, by the roughness of urban topography (buildings).
For area sources, it is possible to input a different value
of initial a  for each stability class, that is six different
            2            ,
values.  Normally, the same value (30 meters) is used for all
stability classes.
*  Workbook of Atmospheric Dispersion Estimates, HEW, 1970,
   Document No. PB 191482.
                             175

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         Table 05
PARAMETRIC VALUES FOR a (p)
                       2
Stability class
1
2
3
4
5
6
"Distance, 'meters 	
100 to 5t)0
a
0.0383
0.1393
1.0020
0.0856
0.0818
0.0545
b
1.2812
0.9467
0.9100
0.8650
0.8155
0.8124
500 to 5,000
a
0.2539 x 10~3
0.4936 x 10"1
0.1014
0.2591
0.2527
0.2017
b
2.0886
1.1137
0.9260
0.6869
0.6341
0.6020
5,000 to 50,000
a
—
__
0.1154
0.7368
1.2969
1.5763
b
—
--
0.9109
0.5642
0.4421
0.3606

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                Appendix D

SURFACE WIND ROSES FOR WAUKEGAN, ILLINOIS;
STOCKTON,  CALIFORNIA;  BURLINGTON,  VERMONT;
     SHERMAN, TEXAS;  PHOENIX,  ARIZONA;
      AND PHILADELPHIA, PENNSYLVANIA
                    177

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                 SURFACE WIND ROSE, JANUARY
                     WAUKEGAN, ILLINOIS
                            N
                                  Legend
Based on four observations
per day for period
January 1938 - December 1939.
                                               5    10   15%

                                  Windroses show percentage
                                  of time wind blew from the
                                  16 compass points or was
                                  calm.
                             178

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                   SURFACE WIND ROSE, JULY
                     WAUKEGAN, ILLINOIS
                             N
                            2.1
Based on four observations
per day for period
January 1938 - December 1939.
                                  Legend
                                  r	
                                   Calm
                                    "-""-"       5    10  15%
                                  Windroses show percentage
                                  of time wind blew from the
                                  16 compass points or was
                                  calm.
                              179

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                  SURFACE WIND ROSE, ANNUAL
                     WAUKEOAN, ILLINOIS
                             N
                                    Legend
Based on four observations
per d,-iy for period
-January 1938 - December 1939.
Calm  }•••- ......... ....... -

                                                     10   151
                                   Windroses  show percentage
                                   of  time wind blew  from the
                                   16 compass  points  or  was
                                   calm,
                              180

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                SURFACE WIND ROSE,  JANUARY
                   STOCKTON, CALIFORNIA
                           N
Based on hourly observations
for period February 1941 -
June 1946.
                                                   10
15%
                                   Wlndroses show percentage
                                   of time wind blew from the
                                   16 compass points or was
                                   calm.
                            181

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                   SURFACE WIND ROSE, JULY
                    STOCKTON, CALIFORNIA
                            N
                            4.7
Based on hourly observations
for period February 1941 -
June 1946.
                                   Legend
I  Calm I
 V,,,,-'
      J	I.
7     I     I	I
                                                    10   15%
                                   Windroses show percentage
                                   of time wtnd blew from the
                                   16 compass points or was
                                   calm.
                            182

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                   SURFACE WIND ROSE,  ANNUAL
                     STOCKTON,  CALIFORNIA
                             N
Based on hourly observations
for period February 1941 -
June 1946.
 Legend



f Calm |-	1
                                               5    10   15%
                                   Windroses show percentage
                                   of time wind blew from the
                                   J-fe compass points or was
                                   calm.
                               183

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                SURFACE WIND ROSE,  JANUARY
                    BURLINGTON,  VERMONT
                           N
                                   Legend
Based on hourly observations
for period January 1948 -
March 1968.
Cairn
                                                    10
                     15%
                                   Windroses show percentage of
                                   time wind blew from the 16
                                   compass points or was calm.
                              184

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                 SURFACE WIND ROSE, JULY

                  BURLINGTON, VERMONT
                          N
Based on hourly observations

for period January  1948 -

March 1968.
Legend




       H	H-
           5    10   15%

Windroses show percentage
of time wind blew from the
16 compass points or was
calm.
                          185

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                SURFACE WIND ROSE, ANNUAL
                   BURLINGTON, VERMONT
                           N
Based on hourly observations
for period January 1948 -
March 1968.
                                    Legend

VT
                                                5   10   15%

                                    Windroses show percentage
                                    of time wind blew from the
                                    16 compass points or was
                                    calm.
                              186

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                SURFACE WIND  ROSE, JANUARY
                      SHERMAN, TEXAS
Based on hourly observations
for periods January 1942 -
January 1946, May 1946 -
November 1946, and July 1948 -
November 1968.
Legend



 Calm |—~

    ,.,f
I.    J     I.
I	I	i"
5   10   15%
                                   Wtndroses show percentage
                                   of time wind blew from the
                                   16 compass points or was
                                   calm.
                             187

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                  SURFACE WIND ROSE, JULY
                      SHERMAN, TEXAS
                            N
Based on hourly observations
for periods January 1942 -
January 1946, May 1946 -
November 1946, and July 1948 -
November 1968.
Legend

X"-""X

 Calm J.	

     /
                 10
                                    Windroses show percentage
                                    of time wind blew from the
                                    16 compass points or was
                                    calm.
                              188

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                SURFACE WIND ROSE, ANNUAL
                     SHERMAN, TEXAS
Based on hourly observations
for periods January 1942 -
January 1946, May 1946 -
November 1946, and July 1948 -
November 1968.
                                                ill
            5   10   15%

Wlndroses show percentage
of time wind blew from the
16 compass points or was
calm.
                               189

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                  SURFACE WIND ROSE, JANUARY
                       PHEONIX, ARIZONA
                              N
Based on hourly observations
tor period January 195] -
December I960,
                                    Legend
( Calm

 V

                                                    10   15%
                                    Windroses show percentage
                                    of time wind blew from the
                                    It. compass points or was
                                    clam.
                              190

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                   SURFACE WIND ROSE, JULY
                      PHEONIX, ARIZONA
Based on hourly observations
for period January 1951 -
December I960,
                                   Legend
                                               5    10  15%

                                   Windroses show percentage
                                   of time wind blew from the
                                   16 compass points or was
                                   c lam.
                             191

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                SURFACE WIND ROSE, ANNUAL
                    PHEONIX, ARIZONA
                                    Legend
                                      —-**
Based on hourly observations
for period January 1951 -
December I960.
I Calm I•-•	-

V    J     \
                                                    10   15%
                                    Windroses show percentage
                                    of time wind blew from the
                                    16 compass points or was
                                    calm.
                             192

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              SURFACE WIND ROSE, JANUARY
               PHILADELPHIA, PENNSYLVANIA

                           N
                                    Legend
Based on hourly observations
for period January 1951 -
December 1960.
                                                5    10   15%

                                    Windroses show percentage
                                    of time wind blow from the
                                    16 compass points or was
                                    calm.
                                    193

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                 SURFACE WIND ROSE, JULY
               PHILADELPHIA, PENNSYLVANIA
                          N
                                   Legend
Based on hourly observations
for period January 1951 -
December 1960.
                                               5    10   15%

                                   Windroses show percentage
                                   of time wind blew from the
                                   16 compass points or was
                                   calm.
                                 194

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                SURFACE WIND  ROSE  ANNUAL
               PHILADELPHIA,  PENNSYLVANIA
                          N
                                  Legend
Based an hourly observations
for period January 1951 -
December 1960.
                                                   10
15%
                                  Windroses show percentage
                                  of time wind blew from the
                                  16 compass points or was
                                  calm.
                               195

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                                  TECHNICAL REPORT DATA
                               "*sdtmauctians on tfurtvcne btfon com»f—"—'
   EPA-6SO''2-74-090
   "nrut A.^Q s
   L-oiB Cuen Sources
              cion ar.d Control of Asbestos Emissions
                                                      September 1974
                                                       8, acRFOHMlC)G ORGANIZATION BfcPOHT NO.
  Colin F.  Harwood and Thomas P. Blaszak
                                                      nTRI-C8290-0
  0 -r«fCHM:.SG CBS \NI2ATION NAME AND AOOBiSS
  IIT Research Institute
  10 VA?st 35th Street
  Chicago,  Illinois  60616
                                                         PB   238   925
                                                       5, HEPOHTOATi
                                                       5. PEceOHMIWG OflGAI»iZJlTlQ*..CO3e
                                                       10. PBOC.fUM ELEMENT NO,
                                                     IABOI5; ROAP 21AFA-004
                                                      11, cbNT«ACT/£RANT'f«O?

                                                     ^8-02-1348
 2. SPONSOR; HO AGINCY NAME A.ND ADDRESS
SPA, Office of Research and Development
NERC-RTP, Control Systems 'Laboratory
Research  Triangle Park, NC 27711
                                                       13. TYP6 Of KfcfORT A,«B
                                                       Final;  6/73-5/71
                                                       1*. SPONSORING AGENCY COOS
                                            by
                                       NATIONAL TECHNICAL
                                       INFORMATION SERVICE
                                           Spri»8!i«M, '*. J315I
              report reviews control technology applicable to asbestos emissions from
  '.c-in sources including asbestos mines, mills,  and manufacturing waste piles.  It
 {combined a literature review with visits to asbestos mining and manufacturing oper-
 Jations, and considered climatology, location, and topography. The study, which
  included preliminary field sampling, produced a comprehensive bibliography on emis-
  sions control.  The health effects 'of asbestos exposure were reviewed from two as-
  pects: the significance of fiber size, and the effect of non-occupational exposure.
  Fiber size considered to be most harmful is still not established and, while non-
  occupational exposure probably does not lead to asbestosis, evidence relates it to
  increased incidence of cancer.  The U.S. asbestos industry has been reluctant to
  adopt control technology for its mining and waste dumping operations which is al-
  ready available for other industries; probable reasons include the relatively small,
  low profit nature of the industry and the relatively recent recognition of the hazardous
  nature of asbestos. All eight U.S.  mine sites were contacted; three others are no
  longer operational. Data, analyses indicated that asbestos can be detected at consid-
  erable distances from a given source. It was concluded that, because of their proxi-
  mity to populations, asbestos manufacturing waste piles are a threat to public health
 more serious than asbestos
                                    DS AND DOCUMENT ANALYSIS I
                 DESCRIPTORS
                                           b.lMNTIFteRS/OPEN ENDED TERMS
                                                                 c.  COSATI Field/Group
 Air Pollution
 Asbestos
 Mining
 Mills
 Disposal
 Field Tesls
                    Analyzing
                    Bibliographies
                    Asbestosis
                    Malignant Neoplasms
Air Pollution Control
Stationary Sources
Open Sources
Storage Areas
Fiber Size
Non-occupational Expo-
  sure	:	
13B
08G, HE, 05B
081, 06E
Of A

14B
 8, OISTR&QUTION STATEMENT
                                           19. SECURITY CLASS (ThitR*portj
                                           Unclassified
                                                                   71. NO. OF PAGES
 Unlimited
                                         20. SECURITY CLASS fThi- pogtj
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£»A form 2229-1

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