18425.007
AIR QUALITY
IMPLEMENTATION PLAN
FOR THE
STATE OF ALASKA
VOLUME I: CONTROL STRATEGY
DECEMBER 1971
Prepared for the
STATE OF ALASKA
DEPARTMENT OF ENVIRONMENTAL CONSERVATION
TRW
SYSTCMS GROUP
ONE SPACE PARK • REDONDO BEACH, CALIFORNIA S0278
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18425.007
AIR QUALITY
IMPLEMENTATION PLAN
FOR THE
STATE OF ALASKA
VOLUME I: CONTROL STRATEGY
DECEMBER 1971
Prepared for the
STATE OF ALASKA
DEPARTMENT OF ENVIRONMENTAL CONSERVA TION
TRW
SYSTEMS GROUP
ONE SPACE PARK. REDONDO BEACH, CALIFORNIA ~027B
-------
The work upon which this publication is based
was performed by TRW Systems Group pursuant
to Contract #68-02-0048 with the Office of Air
Programs, Environmental Protection Agency.
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TABLE OF CONTENTS
NOMENC LA TURE
PREF ACE
1. OVERVIEW OF THE CONTROL STRA TEGY
1. 1 Introduction
1. 2 Alaskan Air Q\Ality Control Regions
1. 3 Control Strategies Development
1.4 General Features of Control Strategies
1. 5 Summary and Conclusions
THE COOK INLET INTRASTA TE AIR QUA LITY
CONTROL REGION
2. 1 Regional Description
2.2 Present Air Quality
2.3 Projected Regional Growth
2.4 Existing Sources of Air Pollutants
2. 5 Impact of Emissions on Air Quality
2.6 Proposed Control Strategy
2. 7 Economic Aspects of the Control Measures
.THE NORTHERN ALASKA INTRASTATE AIR
QUA LITY CONTROL REGION
3. 1 Regional Description
3.2 Present Air Quality
3.3 Projected Regional Growth
3.4 Existing Sources of Air Pollutants
3.5 Impact of Emissions on Air Quality
3.6 Proposed Control Strategy
THE SOUTH CENTRAL ALASKA INTRASTATE Am
QUALITY CONTROL REGION
4. 1 Region Description
4.2 Present Air Quality
4.3 Existing Sources of Air Pollutants
4.4 Potential New Sources
4.5 Proposed Control Strategy
THE SOUTHEASTERN ALASKA INTRASTATE Am
QUALITY CONTROL REGION
5. 1 Region Description
5.2 Present Air Quality
5. 3 Existing Sources of Air Pollution
5.4 Potential New Sources
5.5 Proposed Control Strategy
REFERENCES
v
vii
1-1
1-1
1-1
1-4
1-9
1-13
2.
2-1
2. 1
2-3
2-5
2-7
2-11
2-20
2-22
3.
3-1
3-1
3-5
3-9
3-10
3-19
3-23
4.
4-1
4-1
4-1
4-1
4-4
4-5
5.
5-1
5-1
5-1
5-1
5-6
5-6
6-1
6.
ii
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Figure Title
1-1 Air Quality Regions of Alaska
2-1 Air Quality Regions of A1aska-<;ook Inlet Intrastate
Air Quality Control Region No. 008
Cook Inlet Area - Major Particulate Point Sources
Major Point Sour ces of the Anchorage Area
Area of City of Anchorage (129.5 km2) and Area of
Greater Anchorage (184 km2)
Existing Land Use, Anchorage Metropolitan Area
Average Daily Traffic Volumes - 1968, Study Area
Traffic Volume Flow - 1968, Central Area
Air Quality Regions of Alaska - Northern Alaska Air
Quality Control Region No. 009
Fairbanks and Vicinity - Major Point Sources
Paved and Unpaved Streets in Fairbanks
1969 Traffic Volume Flow Map Topics Study Routes
1969 Traffic Volume Flow Map Central Area
Fairbanks "Urban Area" and "Air-shed Area"
2-2
2-3
2-4
2-5
2-6
2-7
3-1
3-2
3-3
3-4
3-5
3-6
4-1
5-1
LIST OF ILLUSTRA TIONS
Air Quality Regions of Alaska - South Central
Alaska Air Quality Control Region No. 010
Air Quality Regions of Alaska - Southeastern Alaska
Air Quality Region No. 011
iii
Page
1-2
2-2
2-6
2-12
2-13
.2-17
2-18
2-19
3-2
3-6
3-16
3-17
3-18
3-20
4-2
5-2
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Table
2 -1
2-2
2-3
2-4
2-5
3-1
3-2
3-3
3-4
4-1
4-2
5-1
5-2
5-3
5-4
5-5
5-6
LIST OF TABLES
Title
Air Qtality Summary, Cook Inlet Intrastate
Air Quality Region
Potential New Source Summary
Potential New Source Summary
Characteristics of Major Point Source Particulate
Emis s ions
Road and Street Maintenance Costs
Air Quality Summary Fairbanks North Star Borough
Potential New Source
Potential New Source
Characteristics of Major Emission Sources, Northern
Alaska Air Quality Control Region
Major Emission Sources ('>100 Tons/Year) Region 010 -
South Central Alaska Intrastate
Potential New Source
Major Stationary Point Source Emissions - Southeastern
Ala s ka
Maximum Downstream Concentrations for
Sources, SOX, CO, and Particulates
Potential New Source
Potential New Source
Maj or Point
Potential New Source
SOX Rollback Requirements for Sulfite Pulp Mill
iv
Page
2-4
2-8
2-8
2-22
3-7
3-11
3-11
3-13
4-3
4-6
5-4
5-5
5-7
5-7
5-8
5-9
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Symbol
C
co
co
d
d
d
c
dh
D
D
P
D
r
Dt
h
H
mt
m2
m3
m4
M
s
n
p
Q
Q
T
a
T
act
NOMENCLATURE
Definition
Urban size
CO concentration at incipient black smoke
winter idle emis sion efficiency
Distance attributed to a vehicle
Stack inside diameter
Average car length
Headway distance
Total delay (D = T t - Tf )
ac ree
Delay reduction time per peak period
Delay reduction time
Total delay reduction time per peak period
Stack height
Height of the plume centerline when it
becomes es sentially level
Dollars saved per peak period
Dollars saved per peak two periods
Total dollars saved per day
Total dollars saved per year
Miles saved
Number of samples
Barometric pres sure
Emission density
Source emission rate
Absolute ambient temperature
Average actual trip time
v
Units
L
M/L3
M/T
L
L
L
L
T
T
T
T (Dt = 2DpP
L
L (h + ~h = H)
(m2 =
(m3 =
2mt)
2m2)
L
F/L2
M/L2T
(us ed in area model)
M/T
(us ed in point model)
OK
T
-------
.--
T Free flow trip time T
free
T Absolute temperature of stack effluents oK
s
u Wind speed LIT
V Stack effluent exit velocity LIT
V Volumetric flow rate at idle L3 IT (10 ft3/min)
Vi Vehicle volume Vehicles/L
Vz Vehicle volume - i direction Vehicles I T
V3 Vehicle volume Vehicles IT
V4 Vehicle volume - Z directions Vehicles/T
Vs Peak quantity Vehicles
W Weight rate of effluents generated M/T
x Downwind displacement from source L
x Maximum ground-level concentration M/L3
max
x Geometric mean M/L3
g
Y Crosswind displacement from source L
z Vertical displacement from source L
~CO CO reduction M/L3
~h Plume ris e L
PL Effluent density M/L3
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PREFACE
This document presents a control strategy designed to achieve
and maintain air quality in Alaska that is within the National Ambient
Air Quality Standards. The control strategy consists of a set of
control measures and procedures to be carried out and enforced by
the State and Regional A ir Quality ControlAgencies. This document
is divided into two books. This book presents a technical
summary of the Strategy. A second volume of appendices presents
the technical details, including all calculations.
This book is divided into six major sections.
Section 1.
OVERVIEW OF THE CONTROL STRA TEGY, presents an executive
summary of the Strategy. It describes briefly the air quality problem
in Alaska, it discusses the background for the problem solution
and presents the control strategy. The subsequent four sections treat
details of control Strategies for each of the four Alaska Air Quality
Control Regions. These sections present, for each region, the region
description, the existing regional air quality, the sources of pollutants,
the proposed control strategy and finally the economic aspects of
the control Strategy. The last Section 6. REFERENCES, gives a list
of the documents and other sources of data from which the strategy
was developed.
vii
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1.
OVERVIEW OF THE CONTROL STRA TEGY
1. 1 INTRODUCTION
A control strategy is a time phased combination of specific
control measures designed to achieve the total reduction of air
pollutant emissions necessary for attainment and maintenance of
national ambient air quality standards. The individual control measures
that make up the control strategy are of many types, as deliniated in
Reference 7. A few examples of measures considered for Alaska
are: process and boiler emission limitations, a permit system to
regulate construction and modification of new facilities, traffic control,
fuel changes a.nd street sweeping.
Alaska is a very large State with a relatively small population of
only 300,0(10. Its population density is about 0.5 persons/square mile
which is smaller than the United States average density by two orders
of magnitude. Industrially, Alaska is in a developing stage and the
industrial density is also relatively small.
The State population and industry is concentrated in the two areas
around Anchorage and Fairbanks. About one third the population is
located at Anchorage and about one sixth at Fairbanks. Likewise,
industrial activities are cent~red around these cities.
1.2 A LASKAN AIR QUA LIT Y CONTROL REGIONS
Alaska is divided into four Air Quality Control Regions, as
designated by the Administrator of the Environmental Protection
Agency and the Constitution of the State of Alaska. The boundaries
of these control Regions are shown on Figure 1-1. The South Central
and the Southeastern region are very sparsely populated. The
Northern region is also sparsely populated, except for Fairbanks.
The Cook Inlet region contains more than a third of the State population
and about the same percentage of the industry.
As one would expect, the air quality for the most part of Alaska
is relatively high. However, certain natural peculiarities of the area
create air quality problems in Anchorage and Fairbanks. These
peculiarities involve the facts that much of Alaska is a bed of glacial
silt which is easily airborne when uncovered and very extreme temper-
ature inversions that frequently exist in Fairbanks.
1 -1
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-'
I
N
~.
."
NORTHERN ALASKA INTRASTATE
AIR QUALITY CONTROL REGION
No. 009
"'~
'---- -
FAIRBANK S
\.
SOUTHEASTERN ALASKA INTRASTATE
AIR QUALITY CONTROL REGION
No. 011
COOK INLET INTRASTATE AIR
QUALITY CONTROL REGION No. 008
.
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Measurements and visual observations of air quality outside the
immediate area of Anchorage and Fairbanks show that its quality is
well within the limits set by the National Ambient Air Quality Standards.
Thus, these areas are classified as priority III for all pollutants.
Measurements of air quality in the Anchorage area have shown
24 hour average particulate concentrations of 711 flg/m3. This is
to be compared with the secondard standard of l50,M.g/m3. These data
are to some extent questioned because the samplers were at only
five feet elevation and therefore sampled both suspended and settleable
particulate matter. Still, they show that a definite particulate problem
exists. Anchorage is thus classified as priority I for particulates and
priority III for all other pollutants.
Measurements of air quality in Fairbanks give very similar results.
The annual geometric mean particulate concentration of 175 Jf.g/m3 is to
be compared with the secondary standard of 60 )Ag/m3.
. The carbon monoxide measurements show one hour maximum
concentrations of 81 mg/m3 compared to the primary standard of 40
mg/in3. These high carbon monoxide concentrations result when a steep
temperature inversion exist and the ambient temperature is very low.
Under such conditions shoppers and workers allow their cars to run
continuously to keep them warm.
Thus Fairbanks is clas sified as priority I for particulate matter
and for carbon monoxide. It is priority III for other pollutants.
The point sources of air pollutants in Alaska are located on the
maps submitted in the attached folder. The location of proposed air
quality surveillance sites are also shown. The legends explain the
significance of the v~rious symbols used.
Map I shows locations for all those sources outside the greater
Anchorage and Fairbanks area. The boundary lines of the four Air
Quality Control Regions are also shown on this map.
1-3
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1-"'-
Map II is an expanded view of the Cook Inlet, and shows the
locations of all sources independent of pollutant type. Companion
Maps ITa through IIe show the location of sources by type. Map IIa shows
particulate matter sources, IIb shows sulfur dioxide sources, lic
carbon monoxide sources, lid shows hydrocarbon sources and lIe
nitrogen oxide sources.
shows
shows
Map III is an expanded view of Anchorage and shows the location
of all sources independent of pollutant type. The companion Maps Ina
through IIIe show the location of sources by type, in the same order as
listed above.
Map IV is an expanded view of Fairbanks and shows the locations
of all sources. Maps IV a through IVe show, again, the location of
sources by type in the order listed above.
1. 3 CONTROL STRA TEGIES DEVELOPMENT
The development of the implementation plan and specifically the
control strategies sections were carried out within the guidelines of
the Federal Register of 14 August 1971. This section describes how
these guidelines were used in the development and selection of
appropriate control measures for the State of Alaska.
1.3. 1 Sulfur Oxide, Nitrogen Oxide and Oxidant Control Strategies
The guidelines covering the development of the control strategies
for these pollutants are described in sections 420. 13 and 420. 14 of the
above cited Federal Register. Neither ambient air quality measure-
ments nor source emission inventories indicate that a problem
existed with respect to any of these pollutants. Therefore, the control
strategy proposed basically consists of an expanded air quality surveil-
lance network and a permit system for the evaluation and control of
construction of new sources of these pollutants.
The sole exception to this strategy type is in the area of sulfur
oxide emissions from two power plants located in the Southeast Alaska
AQCR. The sulfur oxide emissions from these plants cause localized
ambient air concentrations in excess of the National Ambient Air Quality
Standards (NAAQS). Specific control regulations requiring application of
reasonably available control technology are proposed to limit these
emissions and a program for developing and enforcing compliance
schedule is presented as a part of the control strategy for this AQCR.
1-4
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1.3.2 Particulate Control Strategy
In most areas of the State suspended particulate measurements
and estimates are well below the secondary NAAQS. For these regions
a preventive control strategy based on air quality surveillance and
the control of construction of new pollution emission sources is
proposed.
In two areas of the State, the greater Anchorage portion of the
Cook inlet and the Fairbanks North Star Borough of the Northern Alaska
AQCR, particulate concentrations above the primary national standards
have been measured. A detailed procedure of control strategy develop-
ment, as outlined in section 420. 13 of the Federal Register, was applied
to these cases.
In the greater Anchorage area, only a relatively small fraction
of the suspended particulate loading can be identified with industrial/
commercial type sources of emission. Atmospheric diffusion estimates
indicate that a majority of the particulate matter is caused by either
natural sources of wind-blown dust or traffic generated dust from road
ways. However, it was neither possible to quantify the contributions
from these sources nor to assign a specific particulate matter background
level to the region with the available data because the air quality data
were made such that both suspended and settleable particulate matter
were collected. The analysis indicated further that application of
reasonably available control technology to stationary sources would
not reduce ambient concentrations below the primary NAAQS.
The control strategy proposed consists of three basic sets of
actions. First, regulations will require all stationary particulate
emission sources to control to the extent of reasonably available
control technology. This step is required in light of the measured
ambient concentrations but, as stated above, will not be sufficient
to reduce concentrations to acceptable levels. Second, a sequenced
program of applying control measures to reduce traffic generated dust
will be instituted. These measures are of the type listed for the control
of fugitive dust in Reference 7 , Appendix B. Third, a detailed
program of air quality surveillance and special studies to determine
the effectiveness of controlling fugitive dust are proposed.
1-5
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This air quality surveillance program will allow the control agency
to refine the control strategy application periodically during the course
of the implementation plan, and will allow maximum effort to be placed
on the attainment of NAAQS by 1975.
In the Fairbanks North Star Borough the situation with regard
to suspended particulate concentrations was roughly similar to that
in Greater Anchorage area. However, the winter particulate levels
in Fairbanks appeared, on the basis of atmospheric diffusion calculations,
to be caused mostly by stationary sources. These sources will be con-
trolled by regulations dealing with fuel combustion. stion.
The summer particulate levels and the annual average concentrations
observed in Fairbanks appear to be significantly influenced by fugitive
dust and! or smoke from forest fires. A phased application of fugitive
dust control measures concurrantly with increas ed air quality
sampling and special studies, to further define the problem, is prc-
posed for this region.
1.3.3 Carbon Monoxide Control Strategy
In most areas of the state no carbon monoxide problem can be
envisioned based upon either ambient measurements or source con-
centrations. However, in the Fairbanks North Star Borough extremely
high levels of carbon monoxide have been measured. A detailed analysis
of the problems, was applied based upon the guidelines supplied in
Section 420. 14 of the Federal Register.
The high ambient carbon monoxide levels appear to be caused
by a combination of cold weather driving habits and limited diffusion
potential of the atmosphere during prolonged inver sion conditions.
Thus, the problem seems to be specifically related to the unusual
climatic conditions occurring in the Fairbanks area.
Development of a control strategies to this problem were affected
by the pecularities of the area. The influence of the Federal Motor
Vehicle Standards on the reduction of automotive pollution emis sions
were difficult to quantify since the best available estimates were
based on urban driving conditions in moderate climates.
The fact
that Fairbanks is a relatively small urbanized area limited, to some
extent
the type of control measures, such as traffic rerouting
1-6
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in conjunction with mass transit, that could be considered in the problem'
solution. The ice fog problem, occurring at low temperatures,
complicated the task of finding solutions since certain proposed control
measures, such as switching motor vehicles to alternate fuels, aggravate
the ice fog problem. The lack of a true measure of the temporal and
spatial extent of the CO concentrations hampered the control strategy
development.
The recommended strategy to control carbon monoxide in this
area followed from the consideration of a number of possible control
measures. The basic strategy called for a time sequenced set of control
actions. These actions are designed to improve traffic flow in the down
town area, reduce unattended idling time by regulation, by installation
of electrical plug-ins for car heating and to switch to a Propane fuel
if ambient levels do not improve within a two year period.
. A keystone of the proposed control strategy is the continuation
and extension of air quality monitoring for carbon monoxide in the
Fairbanks North Star Borough. The monitoring data will be periodically
reviewed to indicate progress made towards the solution of the problem
and optimum control of alternatives to be implemented at any particular
point in time.
1.3.4 Schedule for Compliance
The entire control strategy was designed on the basis that
National Ambient Air Quality Standards will be achieved within three
years following approval of the implementation plan. All,
identifiable stationary sources will be in compliance with the proposed
emission limitations by the end of this time. The initiation of control
measures, as described above for particulates and carbon monoxide,
will allow considerable reduction in the pollutants emissions to be
achieved within the three year period. The proposed control
strategy provides sufficient checkpoints in terms of air monitoring
quality and control strategy applications that a maximum possible
result in terms of ambient air concentrations should be achieved.
1-7
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1.3. 5 Intra and Interstate Influences of Emissions Sources
Section 420. 10 of the Federal Register requires that consideration
be given to the impact of emission sources. located in one region
on ambient air quality in other areas. The air quality control regions
are very large in Alaska and populated areas are separated by several
hundred miles. There are no known or suspected instances where
pollutant emissions in one region affect the air quality in another.
Alaska I s location makes interstate effects unlikely and the location
of sources within Alaska makes international air quality degrad-
ation very improbable.
1-8
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1.4 GENERAL FEA TURES OF CONTROL STRA TEGIES
1. 4. 1
Preventive Aspects
The control strategy for the State of A laska as presented in the
implementation plan will be evaluated as a strong preventive program
with the exception of three areas where corrective programs are required.
Most areas in the State now enjoy almost perfectly clean air. In only
three specific cases are national primary or secondary ambient air
quality standards thought to be exceeded. The desire to maintain this
environmental quality will be achieved by rules and regulations of the
State of Alaska proposed as part of this implementation plan. A set
of strong emission limitations, are required to provide the basis for
an environmentally sound development of the State's resources. The
registraHun and permitting system gives the State and local air
polluti.un control agencies the tools required to effectively protect the
ambient air quality.
1.4.2 Use of Air Monitoring Studies
In addition to the general air quality surveillance system, each of
the proposed special studies will supply information vital to the design
or implementation of effective control measures. The detailed
descriptions of these studies are presented in the Air Quality Sur-
veillance Volume of this Imp1emental Plan; the specific application of
these studies to the control strategy is discussed below.
The determination of the amount of automobile traffic-generated
particulate material will significantly affect the particulate control
strategy for both Anchorage and Fairbanks. If particulate road
conditions and/ or modes of vehicle operation are shown to be pre-
dominant in the generation of airborne particulate material, then a
revision or realignment of the control strategy would be carried out.
Conversely, if vehicle operations are not shown to be significant
contributors to the regional suspended particulate problem, then
other types of special air quality monitoring studies would be indicated.
The determination and evaluation relationship between sampler
elevation and measured suspended particulate concentration will assist
further control strategy development and implementation in two ways,
1-9
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First, these data will allow a more informed appraisal of the results
of previously collected air quality data. Secondly, sampler elevation
data should indicate to what extent particular sampling locations are
influenced by nearby or distant pollution sources. In both of the above
ways, the study defining the relationship between sampler elevation
and suspended particulate measurement can assist agencies in
evaluating the selected control strategy and may provide the basis
for strategy revisions.
Measurement of the size distribution of suspended particulate
material will further define the nature of the suspended particulate prob-
lem in Anchorage. The true health significance, in terms of amount of
respirable dust, can be ascertained with these measurements. Also, the
effectiveness of various control measures, both on a local scale and region-
wide, can be judged on the basis of the particle size data. For instance,
if a significant fraction of the total particulate loading is caused by parti-
cles 10 microns or larger in diameter, then sources in the immediate
vicinity of the sampler (such as traffic) probably predominate since large
particles are not generally transported over great distances in the atmo-
sphere. A correlation of high dustfall measurements with high suspended
particulate readings provides a similar indication, although in a more
qualitative sense.
Each of the special studies will be an aid to the more explicit defini-
tion of the particulate problem in Anchorage and Fairbanks in particular
and in Alaska in general. As each study is completed, it will be possible
for the control agencies to more specifically plan appropriate control
activities and to concentrate on thos e control strategies which are indicated
to be most effective in terms of the actual suspended particulate problem.
The measurement of certain hazardous air contaminants (e. g. ,
mercury, beryllium, lead, asbestos, etc.) as special monitoring studies
will assist the control agencies in protecting the health of State residents.
Although these pollutants are not specifically addressed in this Implemen-
tation Plan, control measures for them will be required in the near future.
The background information gained from this study will be invaluable in
assisting in the development of effective agency plans at that time.
1-10
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Air quality sampling at remote locations will provide the operating
control agencies with two direct benefits in terms of control strategies.
First, background measurements obtained at locations relatively remote
from existing sources or population concentrations provide excellent back-
ground information on naturally occurring pollutant levels. Agency per-
sonnel will also become familar with the topographic and meteorological,
peculiarities of the areas studied. Second, the impact of any proposed
industrial developments in the regions sampled could be effectively
evaluated. Each source's contribution to the existing ambient pollution
levels could be estimated and the appropriate pollution control measures
specified before an air quality degradation results. The necessity for
measurements at selected remote locations is, therefore, obvious in
terms of a comprehensive preventive control strategy.
1. 4.3 Use of the Permit System
, The proposed permit system described in the Permit System Volume,
of the Implementation Plan forms an integral part of the overall air pol-
lution control strategy. The most carefully designed control strategy is
of no value in achieving and maintaining National Ambient Air Quality
Standards unles s it is completely and universally enforced. This is the
function of the permit system. The three basic areas in which the permit
system facilitates the implementation of the control strategy are'discussed
in the following paragraphs.
First, the permitting of sources of atmospheric pollutant emissions
provides the cognizant control agencies with a formalized mechanism for
securing compliance of existing air pollution sources with air pollution
control regulations. All sources affected by the control regulations must
submit a registration application to the appropriate control agency. If
the source has emi~sion rates greater than those allowed by the regulation,
the permit system provides for the negotiation and enforcement of a time
schedule by which the source will reduce its emissions to the prescribed
level. The use of the permit system in this context is more full des cribed
in the Permit System Volume dealing with com~liance sc~edules.
The permit system, through its permit to construct provisions,
provides an explicit method by which new sources (or modifications of
existing sources) can be integrated into the overall control strategy.
1-11
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The appropriate control agency must be informed prior to construction
not only of the existence and location of the proposed source but also
of those operational characteristics which affect air pollutant emissions.
Detailed review procedures carried out both before construction and
prior to operation will insure that all new sources comply with applicable
emission limitations. The control agency will be able to determine,
by means of the information supplied by the source operator for review,
whether the construction and subsequent operation of the source is
likely to degrade the air quality in the region to below secondary
NAAQS.
After a permit is granted, it must be reviewed periodically, and
this allows the agency to regulate operating sources in the same way.
Thus, with proper administr~tion of the permit system described in
this plan, attainment of the NAAQS will be facilitated, and AQCR's
which are presently clas sified Priority III will be prevented from
exceeding the secondary standards.
.. -. ..,.. . -~ '" '. -'.'......
1.4.4 Projections of Growth and Air Quality
Population growth projections were made for the greater
Anchorage area and for the Fairbanks North Star Borough on the basis
of projections of the Labor Department. The projected growth rate
is 3% per year for both areas.
Air quality projections are based on projected emissions from
stationary and mobile sources. The ground rule in determining
emission reductions required to meet the NAAQS is to assume that
all stationary source emissions increase at the rate of 3l/:! per year
as do mobile source emissions with the exception of gasoline powered
motor vehicles. While the car populatio~ growth, is projected
to match population growth; the carbon monoxide reduction, due to
Federal Regulations on car emissions, is calculated for normal
driving. However, the emissions inherent due to cold weather driving
and idling are assumed to grow as the car population growth. This is
a very conservative assumption, necessary because the Federal
Regulation addresses driving conditions in a far more temperate
climate and has an undefined impact on either extreme cold weather
idling or driving.
1-12
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1.5 SUMMARY AND CONCLUSIONS
1. 5. 1 Cook Inlet Intrastate AQCR
A 40% reduction in the concentration of particular matter in the
Cook Inlet AQCR is required for meeting the secondary NAAQS. The
air quality reduction cannot be re lated to a percentage roll back of point
source emissions, since the major portion of the existing particulate con-
centrations result from natural causes and road traffic. Applications of
reasonably available control technology are a recommended control meas-
ure. Road and street paving, road oiling, and wet street-sweeping are
also recommended control measures, although accurate predictions of their
effects cannot be made.
Control strategies for other pollutant species consist of preventive
measures, such as fuel regulations and will be monitored by the permit
system.
1.5. Z Northern Alaska Intrastate Air Quality Control Region
A 60% reduction in particulate concentrations is required to meet
NAAQS. The causes and control measures discussed in Section 1.5. 1
apply in Fairbanks.
reasonably available
mended.
A 50% reduction in CO concentration is required in this AQCR. The
high CO concentration in this region results mostly from cold weather
driving and idling of automobiles. The Federal motor vehicle regulations
for CO emission reduction will provide a 12% net reduction in emissions by
1975, and a Z 7% net reduction by 1977. Regulations will be adopted which
prohibit unattended car idling which will result in a 15% reduction. Further
a city by-pass highway to be complete in 1973 will reduce traffic and CO
emissions by about 100/('.
Control strategies for other pollutant species consist of preventive
In addition, power plants are contributors, and
technology controls on stack emissions are recom-
measures only.
1.5.3 Southwest Alaska Intrastate AQCR
The existing air quality in this region satisfies the NAAQS, and
only preventive control measures are necessary.
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1-13
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1. 5.4 Southeast Alaska Intrastate AQCR
High ambient levels of 502 occur in two localized areas, due to
the presence of pulp mills. Emission limitations by regulations requiring
reasonably available control technology will result in the attainment of
secondary standards in these areas within the scheduled period for attain-
ment of primary standards. This represents a 300/(' reduction (to secondary
standards) in the ambient concentration of 502 in these areas.
Control measures for other pollutants in this region are preventive
in nature.
1-14
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2.
THE COOK INLET INTRASTATE AIR QUALITY CONTROL REGION
2.1 REGIONAL DESCRIPTION
2.1.1
Topography and Climatology
This Air Quality Control Region is located in and around the Cook
Inlet Basin. It consists of the Greater Anchorage Area Borough, the
Kenai Peninsular Borough and the Matanuska-Susitna Borough. The basin
is surrounded on three sides by high mountain ranges: the Alaska Range
to the west and north, the Talkeetna Mountains to the northeast, the
Chugach Mountains to the east, and the Kenai Mountains to the south.
The basin opens into the Gulf of Alaska and the Pacific Ocean through the
Cook Inlet. The Inlet which runs southwest from Anchorage, is 20 to 30
miles wide and about 100 miles long. The map in Figure 2 -1 shows the
boundaries of the AQCR. Three more maps showing the region in increas-
ing detail can be found in the folder.
The city of Anchorage lies ln a broad valley with adjacent narrow
bodies of water. The Chugach Mountains to the east form an effective
barrier to the influx of warm moist air from the Gulf of Alaska. The
Alaska Mountain Range to the northwest and northeast acts as a barrier
to the influx of very cold air from the north. Cold air entrapment in some
suburban areas tends to offset this sheltering effect, resulting in occa-
sional extremes of l5° with temperatures 150 to 200F colder in the suburbs.
Seasons are well defined in Anchorage with winter exte'nding from
mid-October to mid-April. Winter is characterized by cloudy, mild
weather alternating with clear, cold weather. The clear, cold days are
frequently accompanied by significant ground fog caused by moisture from
the arms of Cook Inlet. Snowfall occurs from mid-October to mid-April.
Normally, the depth of snow cover on the ground does not exceed 15 inches.
Strong, gusty winds occur infrequently during the winter months. Spring
is the period following the "breakup." This season is characterized by
warm days and chilly nights. Precipitation is negligible. Summer com-
prises the period from June through early September. The latter half of
the season accounts for about 40 percent of the annual precipitation.
Autumn is brief, beginning shortly after mid-September and lasting until
2-1
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N
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NORTHERN ALASKA I NTRAST A TE
AIR QUALITY CO NTROL REGION
No, 009
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FAIRBANKS
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SOUTHEASTERN ALASKA INTRASTATE
AIR QUALITY CONTROL REGION
No, 011
COOK INLET INTRASTATE AIR
QUALITY CONTROL REGION No. 008
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SOUTH CENTRAL ALASKA INTRASTATE
AIR QUALITY CONTROL REGION No. 010
(CONSISTS OF FOUR NO NCONTINGUOUS AREAS)
Figure 2-1.
Air Quality Regions of Alaska-Cook Inlet Intrastate Air
Quality Control Region No. 008
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mid-October. Precipitation is limited and may occur as rain or snow.
Some of the stronger southerly winds occur in late summer or fall.
2.1.2 Soil Characteristics
The soils in the Anchorage area are podzol soils found especially
in regions having hum.'d, cool clima.te (ReferencelS, p. 7). Podzolation
to form soil of this type involves leaching of the upper layers with accu-
millation of heavier material in lower layers. The podzol soils have an
organic mat and a thin organic -mineral layer above a gray leached layer
resting on clay enriched alluvial horizon. * Thus, the upper layers of soil
of the area tend to be sandy, grainy and loosely packed, characterized by
a thin cover of loess and by sandy dunes (ReferencelS' p. 6). The well-
developed podzol soils are ashy in appearance because of the extreme
leaching 01 soluble salts and organic matter. Loess is small sized
particulate material deposited by the wind; thus, like sand, it is readily
blown by the wind whenever the ground cover is disturbed or rernoved.
2.2 PRESENT AIR QUALITY
The air quality control region is classified Priority I only for
particulates. It is classified as Priority III for all other pollutants.
The air quality data available for this region are discussed and
evaluated in the Air Quality Surveillance System Volume. Two maps
included in that volume show the locations of the point sources in the
air quality control region. The location of the major point sources are
shown on the enclosed maps I, II, and III. The results of the air quality
data evaluation are summarized and compared to the National Ambient
Air Quality Standards in Table 2-1.
Air quality data relating to SO and NO are considerably below the
x x
primary national standard. No data are available for CO, hydrocarbons
or photochemical oxidants.
The highest particulate concentrations were measured in the central
part of Anchorage. The available air quality data are not sufficient to
permit identification of all sources of suspended particles of dust, as
discussed below, and the air quality surveillance system proposed in the
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