\l'
 United States
 Environmental Protection
 Agency
Atmospheric Sciences
Research Laboratory
Research Triangle Park, NC 27711
 Research and Development
EPA/600/S3-88/010  May 1988
 Project Summary

 National Ambient Volatile
 Organic Compounds (VOCs)
 Data Base  Update
 Jitendra J. Shah and Emily K. Heyerdahl
  The  National Ambient Volatile
Organic Compounds (VOCs) Data
Base update is the result of an
ongoing effort to gather, evaluate.and
compile  the  measured  con-
centrations of  a  large  number of
VOCs.  Data  on  the  observed
concentrations of three  hundred
twenty  (320)  volatile  organic
compounds (VOCs) were compiled,
critically evaluated, and assembled
Into a relational data base. Ambient
(outdoor)  measurements, indoor
data,  and  data  collected with
personal monitors are included. The
data are primarily from the  period
1970-1987 and for locations within
the United States.  In  order to
compare data from many different
sources, each concentration record
in the data base represents the daily
average for a single chemical,
wherever feasible. The total data
base contains  more than  175,000
concentration records.
  Summaries   of   the   data
distributions are  tabulated  in the
report.  The average, median and
quartile values  are given for each
chemical measured  in  both the
ambient and indoor site categories.
Median values  are also listed for
each chemical for the eight specific
site types included in the data report.
The ambient site types are: remote,
rural, suburban, urban, and source
dominated. The indoor category of
site types include  residential indoor,
workplace  (non-industrial),  and
personal monitors.
  The data have  been  assembled
into a relational  data base using
dBASE III Plus,  a commercially
available data base management
program. The data  base is available
on  IBM PC-compatible  diskettes.
The report contains  a  complete
description of the data base files and
a guide describing the use  of a
prepared program for searching and
maintaining the data base.
  This  Project   Summary  was
developed by EPA's Atmospheric
Sciences  Research  Laboratory,
Research  Triangle Park, NC,  to
announce key findings of the research
project that is  fully  documented in a
separate report of the same title (see
Project Report ordering information at
back).

Introduction
  Over the last decade, concerns about
exposure to potentially toxic chemicals in
the  atmosphere have contributed  to a
growing  body  of literature on
concentrations of  Volatile  Organic
Compounds (VOCs) in the environment.
Knowledge of the ambient concentrations
of  VOCs is   very  useful to the
Environmental Protection Agency (EPA),
and, therefore, the first national ambient
VOC data base was  prepared for EPA
and published  in 1983.1 That original
data base  critically evaluated and
consolidated published data on ambient
(i.e., outdoor)  concentrations of 151
VOCs  measured in the United States
during the years 1970 to 1980.
  The concerns about air toxics  have
persisted, and, as a result, the knowledge
about  environmental  concentrations  of
VOCs  has increased considerably in the
intervening years. Much more information

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is  now available on VOCs in  the
environment. The  1983  national  data
base on  VOCs has  been updated to
include both ambient  and indoor  VOC
data for the years 1980  to 1987. The
updated data base includes information
on 320 VOCs.   The chemicals included
in  the data base are listed in Table 1.
The data  were evaluated for quality by a
rating and ranking scheme. The updated
data base is  available  on  IBM PC-
compatible diskettes for use with dBASE
III  Plus,  a commercially-available
relational  data base  management
system.
    The objectives of the task to update
the data base were:
 1. Review  EPA's existing VOC  data
    base and correct any discrepancies
    found;
 2. Identify newly-published  and
    unpublished VOC data,  critically
    evaluate the data, combine them
    with the previous data, analyze the
    resulting data base; and,
 3. Provide the  resulting VOC data base
    in  a  dBASE  III  Plus  format(s)
    designed to facilitate  searching,
    sorting,  editing,  analysis  and other
    manipulations.

Procedures
    Each of the major tasks involved in
updating  the data base  are  discussed
briefly below. The principal elements are:
 • Perform quality  assurance  (QA)
    checks of the original data set and
    convert  it to a relational  data  base
    format;
 • Conduct a literature search to obtain
    new  data,  including contacting
    individuals  and  organizations
    measuring VOCs  to  request
    additional or unpublished data;
 • Develop criteria for  critically
    evaluating  (ranking and rating) the
    data base;
 • Review reports, extract and critically
    evaluate data;
 • Select an appropriate relational data
    base format and enter all the data;
 • Assure the  quality of  the data base
    entries;
 • Statistically  analyze the data base.

Original  Data  Base:  QA  and
Conversion
    The  original 1983 VOC  data  base
contained comprehensive  information on
ambient levels of VOCs in the U.S. from
1970 to   1980.  This data base  was
checked   for erroneous  entries,  and
converted to dBASE III Plus format to be
included in the updated data base.
Literature Search/Obtain Data

    A major  on-line literature search
was  performed  using the  Chemical
Abstracts data base of the DIALOG on-
line system. The data base was searched
for each  of the  151 chemicals  in  the
original data base by Chemical Abstract
Service registry number combined with
key  words to limit  retrievals to  the
ambient and indoor  atmospheres in the
U.S.  during the years of interest (1980 to
present).
    The search yielded a list of 2769
references of  which  600 were reviewed
for useful data.
    In addition, unpublished or additional
data which may have been too extensive
for a journal article were sought from the
scientific community. A survey form was
developed and an Office of Management
and  Budget  clearance obtained.  The
survey  form  was distributed  to
researchers who might have additional
data. Data   gathered through  EPA
sponsored programs were  also obtained.
A telephone  follow-up of researchers
was  necessary to  obtain  adequate
response.

Develop Data Assessment
Criteria
    To facilitate data evaluation, the data
quality was judged and reported in the
form of ranking and rating. Ranking,  a
multi-digit number  gives a  numerical
value to each of three factors affecting
data quality: (1) the  appropriateness of
the  methodology,  (2) the  probable
accuracy of the quantification, and (3) the
available  documentation. Ranking  would
be most useful for  data  evaluation by
researchers  familiar   with  VOC
measurements.  Rating, a single letter
code, on the other  hand,.is  an  overall
measure  of  data  quality.  Rating is
determined  from  the three ranking
factors and their relative importance.

Extract and Critically Evaluate
Data
    All reports and papers received from
researchers  or  obtained  from  the
literature  search  were reviewed  and
evaluated  for  measurements  of
environmental  concentrations of  VOCs.
The  information was extracted from the
useful reports and coded for data entry.
Much  of  the information  from  EPA
projects was  already  available  on
diskettes,  which  helped  minimize data
entry errors.  Information relevant  to the
ranking and  rating  process was  noted,
and the critical evaluation of the data was
accomplished with input from an advisof
panel of experts.                    ™

Create Relational Data Base
and Enter Values
    A relational data base format was
established,  as  shown  in Table 2. The
coded  data from  reports  and  EP^
diskettes were entered into  dBASE  II
Plus files. dBASE III Plus permits  the
specification of  ranges of acceptable
input values, which allows for immediate
error checking  and  correction.  The
original   data   base  containec
approximately  18,000 concentratior
records. The updated data base include;
more than 175,000.

Assure Quality of Data Base
Entries
    To  assure the quality of the  dat<
entries,  the  following procedures  were
employed.
 •  Only  experienced  data  entn
    personnel were used.
 •  Many  of the data were obtained 01
    diskettes and transferred directly inti
    dBASE III Plus format.
 •  Simple  error-checking technique;
    available in dBASE III+  were use<
    as appropriate.
 •  All  software  was user-friendly aft
    tested thoroughly before use.      "
 •  Scatterplots and other techniques fc
    identifying "outliers"  as  potential!
    erroneous data were performed.
 •  More than 10% of  the reports wen
    independently  reviewed  by  tw
    analysts.
 •  The data were thoroughly  reviewe
    by a panel of prominent researcher
    in this field.

Statistically Analyze the Data
Base
    The authors  performed  summar
statistics on the  master data file. Th
results  are tabulated in the  full proje<
report.

Summary
   Data on  the measurement  of  thre
hundred twenty volatile organic chemic
air  pollutants  has been assemble*
critically evaluated, and organized  into
versatile, relational data base. The projei
report and the data base are available f<
public  distribution. The complete  da
base contains  information on   bol
outdoor and indoor measurements,  bi
for  convenience in manipulating the dat
the indoor and ambient data have  be«
separated into  two concentration  file
The concentration  file of  ambie

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 leasurements  contains more than
.22,000 records on the listed chemicals.
The indoor concentration file contains
more  than 52,000 records involving
seventy-one chemicals.
  The original  VOC data  base was
widely  used, and the new data base is
expected to  have  even  wider
applications. Potential applications of the
data base include screening  level
exposure  assessments, pattern or trend
analysis,   input  values  for modeling
studies,  determination  of available
analysis methods, etc.

References
 1.  Brodzinsky,  R. and  H.B.  Singh
    "Volatile Organic Chemicals in  the
    Atmosphere:  An Assessment  of
    Available  Data,"   (1988)  En-
    vironmental  Sciences  Research
    Laboratory,  U.S. EPA,  Research
    Triangle  Park,  NC,  EPA-600/3-
    83-O27(A) (1983).

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Table 1
Data
Base
Chem-
ical
A/o.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

. Chemicals Included in the Data Base A
Chemical
Abstracts
System
Number Chemical Name
??
??
??
??
50-00-0
55-18-5
56-23-5
59-89-2
62-53-3
62-75-9
64-18-6
64-67-5
67-64-1
67-66-3
67-72-1
71-43-2
71-55-6
74-82-8
74-83-9
74-84-0
74-85-1
74-86-2
74-87-3
74-88-4
74-95-3
74-97-5
74-98-6
74-99-7
75-00-3
75-01-4
75-05-8
75-07-0
75-09-2
75-15-0
75-18-3
75-21-8
75-25-2
75-27-4
75-28-5
75-34-3
75-35-4
75-44-5
75-45-6
75-56-9
75-69-4

7-METHYL-3-METHYLENE- 1 , 6-OCTADIENE
OIPHENYL ETHER
CUMENE
8UTYNE
FORMALDEHYDE
N-ETHYL-N-NITROSOETHANAMINE
CARBON TETRACHLORIDE
4-NITROSOMORPHOLINE
ANIUNE
01 METHYL NITROSAMINE
FORMIC ACID
DIETHYL ESTER SULFURIC ACID
ACETONE
CHLOROFORM
HEXACHLOROETHANE
BENZENE
1, 1, 1-TRICHLOROETHANE
METHANE
BROMOMETHANE
ETHANE
ETHENE
ACETYLENE
CHLOROMETHANE ,
IODOMETHANE
DIBROMOMETHANE
BROMOCHLOROMETHANE
PROPANE
1-PROPYNE
CHLOROETHANE
VINYL CHLORIDE
ACETONITRILE
ACETALDEHYDE
METHYLENE CHLORIDE
CARBON DISULFIDE
THIOBISMETHANE
ETHYLENE OXIDE
TRIBROMOMETHANE
BROMODICHLOROMETHANE
2-METHYLPROPANE
1,1-DICHLOROETHANE
1,1-DICHLOROETHENE
PHOSGENE
CHLORODIFLUOROMETHANE
PROPYLENE OXIDE
TRICHLOROFLUOROMETHANE
(continued)

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Table 1. (Continued)
Data
Base Chemical
Chem- Abstracts
ical System
No. Number
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
6T
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90

75-71-8
75-73-0
75-74-1
75-83-2
75-93-4
75-97-8
76-01-7
76-13-1
76-14-2
77-47-4
77-78-1
78-00-2
78-75-1
78-78-4
78-79-5
78-87-5
78-93-3
79-00-5
79-01-6
79-29-8
79-34-5
79-46-9
79-92-5
80-56-8
87-61-6
87-68-3
90-12-0
91-20-3
91-22-5
91-57-6
93-55-0
95-47-6
95-48-7
95-49-8
95-50-1
95-63-6
95-93-2
96-12-8
96-14-0
96-22-0
96-37-7
98-82-8
98-83-9
98-86-2
98-95-3

Chemical Name
DICHLORODIFLUOROMETHANE
TETRAFLUOROMETHANE
TETRAMETHYLPLUMBANE
2,2-DIMETHYLBUTANE
MONOMETHYLESTER SULFURIC ACID
3,3-DIMETHYL-2-8UTANONE
PENTACHLOROETHANE
1,1,2-TRICHLORO-1,2,2,-TRIFLUOROETHANE
1,2-DICHLORO-1,1,2,2-TETRAFLUOROETHANE
1,2,3,4,5,5-HEXACHLOROCYCLOPENTADIENE
DIMETHYL SULFATE
TETRAETHYLPLUMBANE
1 ,2-DIBROMOPROPANE
2-METHYLBUTANE
2-METHYL-1 ,3-BUTADIENE
1,2-DICHLOROPROPANE
2-BUTANONE
T , 1 ,2-TRICHLOROETHANE
TRICHLOROETHENE
2, 3-DIMETHYL8UTANE
1,1,2,2-TETRACHLOROETHANE
2-NITROPROPANE
2,2-DIMETHYL-3-METHYLENE-BICYCLOf2.2.1l-HEPTANE
2,6,6-TRIMETHYL-BICYCLO{3. 1. 1 ]-HEPT-2-ENE
1,2,3-TRICHLOROBENZENE
1,1,2,3,4,4-HEXACHLORO-1,3-BUTADIENE
1 -METHYLNAPHTHALENE
NAPHTHALENE
QUINOLINE
2-METHYLNAPHTHALENE
1 -PHENYL- 1 -PROPANONE
1 ,2-DIMETHYLBENZENE
2-METHYL PHENOL
1 -CHLORO-2-METHYLBENZENE
1,2-DICHLOROBENZENE
1,2,4-TRIMETHYLBENZENE
1,2,4,5-TETRAMETHYLBENZENE
1,2-DIBRQMO-3-CHLORQPROPANE
3-METHYLPENTANE
3-PENTANONE
METHYLCYCLOPENTANE
(1 -METHYLETHYL)-BENZENE
1 -(METHYLETHENYL)-BENZENE
1 -PHENYLETHANONE
NITROBENZENE
(continued)

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Table 1.
Data
Base
Chem-
ical
No.
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135

(Continued)
Chemical
Abstracts
System
Number
99-87-6
100-41-4
100-42-5
100-44-7
100-47-0
100-52-7
103-65-1
104-51-8
105-05-5
105-67-9
106-42-3
106-43-4
106-44-5
106-46-7
106-89-8
106-93-4
106-95-6
106-97-8
106-98-9
106-99-0
107-02-8
107-04-0
107-05-1
107-06-2
107-10-1
107-12-0
107-13-1
107-50-6
107-83-5
107-87-9
108-08-7
108-31-6
108-38-3
108-39-4
108-47-4
108-48-5
108-67-8
108-68-9
108-70-3
108-75-8
108-86-1
108-87-2
108-88-3
108-89-4
108-90-7

(
Chemical Name
1 -METHYL-4-(1 -METHYLETHYLhBENZENE
ETHYLBENZENE
ETHENYLBENZENE
(CHLOROMETHYD-BENZENE
BENZONITRILE
BENZALDEHYDE
PROPYLBENZENE
BUTYLBENZENE
1, 4-DIETHYLBENZENE
2. 4-DIMETHYLPHENOL
1.4-DIMETHYLBENZENE
1 -CHLORO-4-METHYLBENZENE
4-METHYLPHENOL
1,4-DICHLOROBENZENE
(CHLOROMETHYL)OXIRANE
1,2-DIBROMOETHANE
3-BROMO- 1 -PROPENE
BUTANE
1-8UTENE
1,3-BUTADIENE
2-PROPENAL
1 -BROMO-2-CHLOROETHANE
3-CHLORQ-1 -PROPENE
1,2-DICHLOROETHANE
4-METHYL-2-PENTANONE
PROPANENITRILE
2-PROPENENITRILE
TETRADECAMETHYLCYCLOHEPTASILOXANE
2-METHYLPENTANE
2-PENTANONE
2,4-DIMETHYLPENTANE
2,5-FURANDIONE
1,3-DIMETHYLBENZENE
3-METHYLPHENOL
2,4-DIMETHYLPYRlDINE
2, 6-DIMETHYLPYRIDINE
1,3,5-TRIMETHYLBENZENE
3,5-DIMETHYLPHENOL
1,3,5-TRlCHLOROBENZENE
2,4,6-TRIMETHYLPYRIDINE
BROMOBENZENE
METHYLCYCLOHEXANE
TOLUENE
4-METHYLPYRIDINE
CHLOROBENZENE
continued)

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Table 1. (Continued)
Data
Base
Chem-
ical
No.
136
137
138
739
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180

Chemical
Abstracts
System
Number
108-94-1
108-95-2
108-99-6
109-06-8
109-66-0
109-67-1
109-70-6
109-97-7
109-99-9
110-02-1
110-54-3
110-56-5
110-82-7
110-83-8
110-86-1
111-44-4
111-65-9
111-66-0
111-76-2
111-84-2
1 12-40-3
115-07-1
115-11-7
115-11-7
119-61-9
119-65-3
120-82-1
123-01-3
123-38-6
123-72-8
123-86-4
123-91-1
124-11-8
124-13-0
124-18-5
124-48-1
126-99-8
127-18-4
127-91-3
135-01-3
135-98-8
141-78-6
141-93-5
142-29-0
142-82-5

Chemical Name
CYCLOHEXANONE
PHENOL
3-METHYLPYRIDINE
2-METHYLPYRIDINE
PENTANE
1-PENTENE
1 -BROMO-3-CHLOROPROPANE
lH-PYRROLEt
TETRAHYDRO'pURAN
THIOPHENE
HEXANE
1,4-DICHLOROBUTANE
CYCLOHEXANE
CYLCOHEXENE
PYRIDINE
1, 1 '-OXYBIS(2-CHLOROETHANE)
OCTANE
1-OCTENE
2-BUTOXYETHANOL
NONANE
DODECANE
PROPENE
2-METHYL-1-PENTENE
2-METHYL-1 -PROPENE
DIPHENYLMETHANONE
ISOQUINOLINE
1,2,4-TRICHLOROBENZENE
DODECYLBENZENE
PROPANAL
BUTANAL
BUTYL ACETATE
1,4-(DIOXANE)
1-NONENE
OCTANAL
DECANE
DIBROMOCHLOROMETHANE
2-CHLORO-1.3-BUTADIENE
TETRACHLOROETHENE
6,6-DIMETHYL-2-METHYLENE-BICYCLOl3. 1. 1J-HEPTANE
1,2-DIETHYLBENZENE
(1 -METHYLPROPYQ-BENZENE
ACETIC ACID ETHYL ESTER
1,3-DIETHYLBENZENE
CYCLOPENTENE
HEPTANE
(continued)

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Table 1.
Data
Base
Chem-
ical
No.
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
19?
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225

(Continued)
Chemical
Abstracts
System
Number
144-19-4
156-59-2
156-60-5
287-92-3
291-64-5
463-49-0
463-58-1
464-06-2
488-23-3
496-78-6
513-35-9
527-53-7
527-60-6
538-68-1
540-84-1
540-97-6
541-02-6
541-05-9
541-73-1
544-76-3
554-14-3
556-67-2
556-68-3
562-49-2
563-45-1
563-46-2
564-02-3
565-59-3
565-75-3
576-26-1
576-73-8
583-61-9
584-94-1
587-04-2
589-34-4
589-43-5
589-81-1
590-18-1
591-76-4
592-13-2
592-27-8
592-41-6
593-45-3
594-18-3
608-93-5

<
Chemical Name
2,2,4-TRIMETHYL-1,3-PENTANEDIOL
(Z)-1,2-DICHLOROETHENE
(E)-1.2-DICHLOROETHENE
CYCLOPENTANE
CYCLOHEPTANE
1,2-PROPADIENE
CARBON OXIDE SULFIDE
2,2.3-TRIMETHYLBUTANE
1,2,3,4-TETRAMETHYLBENZENE
2,4,5-TRIMETHYLPHENOL
2-METHYL-2-BUTENE
1,2,3,5-TETRAMETHYLBENZENE
2,4,6-TRIMETHYLPHENOL
PENTYLBENZENE
2,2,4-TRIMETHYLPENTANE
DODECAMETHYLCYCLOHEXASILOXANE
DECAMETHYLCYCLOPENTASILOXANE
HEXAMETHYLCYCLOTRISILOXANE
1,3-DICHLOROBENZENE
HEXADECANE
2-METHYLTHIOPHENE
OCTAMETHYLCYCLOTETRASILOXANE
HEXADECAMETHYLCYCLOOCTASILOXANE
3,3-DIMETHYLPENTANE
3-METHYL-1-BUTENE
2-METHYL-1 -BUTENE
2,2,3-TRIMETHYLPENTANE
2,3-DIMETHYLPENTANE
2,3,4-TRIMETHYLPENTANE
2, 6-DIMETHYLPHENOL
1,2,3-TRIMETHYLBENZENE
2,3-DIMETHYLPYRIDINE
2,3-DIMETHYLHEXANE
3-CHLOROBENZALDEHYDE
3-METHYLHEXANE
2,4-DIMETHYLHEXANE
3-METHYLHEPTANE
(Z)-2-BUTENE
2-METHYLHEXANE
2,5-DIMETHYLHEXANE
2-METHYLHEPTANE
1-HEXENE
OCTADECANE
DIBROMODICHLOROMETHANE
PENTACHLOROBENZENE
(continued)

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Table 1.
Data
Base
Chem-
ical
No.
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270

(Continued)
Chemical
Abstracts
System
Number
611-14-3
616-12-6
616-43-3
616-44-4
619-99-8
620-14-4
622-96-8
624-64-6
624-92-0
625-27-4
627-20-3
627-42-9
629-50-5
629-59-4
629-62-9
629-78-7
630-20-6
636-41-9
646-04-8
674-76-0
691-38-3
693-89-0
763-29-1
871-83-0
931-54-4
933-98-2
934-80-5
1068-87-7
1077-16-3
1120-21-4
1320-37-2
1333-41-1
1334-78-7
1502-38-1
1640-89-7
1678-91-7
1759-58-6
1762-26-1
1762-27-2
1762-28-3
1795-27-3
2049-94-7
2213-23-2
2216-30-0
2216-33-3

Chemical Name
1 -ETHYL-2-METHYLBENZENE
(E)-3-METHYL-2-PENTENE
3-METHYL- 1 H-PYRROLE
3-METHYLTHIOPHENE
3-ETHYLHEXANE
1-ETHYL-3-METHYLBENZENE
1 -ETHYL-4-METHYLBENZENE
(E)-2-BUTENE
DIMETHYLDISULFIDE
2-METHYL-2-PENTENE
(Z)-2-PENTENE
1 -CHLORO-2-METHOXYETHANE
TRIDECANE
TETRADECANE
PENTADECANE
HEPTADECANE
1, 1,1,2-TETRACHLOROETHANE
2-METHYL- 1 H-PYRROLE
(E)-2-PENTENE
(E)-4-METHYL-2-PENTENE
(Z)-4-METHYL-2-PENTENE
1 -METHYLCYCLOPENTENE
2-METHYL-1-PENTENE
2-METHYLNONANE
ISOCYANOBENZENE
1 -ETHYL-2,3-DIMETHYLBENZENE
4-ETHYL-1 ',2-DIMETHYLBENZENE
3-ETHYL-2,4-DIMETHYL PENTANE
HEXYLBENZENE
UNDECANE
DICHLOROTETRAFLUOROETHANE
METHYLPYRIDINE
METHYLBENZALDEHYDE
METHYLCYCLOOCTANE
ETHYLCYCLOPENTANE
ETHYLCYCLOHEXANE
TRANS-1,3-DIMETHYL CYCLOPENTANE
ETHYLTRIMETHYLPLUMBANE
DIETHYLDIMETHYLPLUMBNANE
TRIETHYLMETHYLPLUMBANE
1A,3A,5A-TRIMETHYLCYCLOHEXANE
(3-METHYLBUTYL)-BENZENE
2,4-DIMETHYLHEPTANE
2,5-DIMETHYLHEPTANE
3-METHYLOCTANE
(continued)

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Tablo 1.
Data
Base
Chem-
ical
Wo.
271
272
273
274
275
276
277
270
279
280
281
282
283
284
285
286
287
288
289
290
29 1
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315

(Continued)
Chemical
Abstracts
System
Number
2216-34-4
2278-22-0
2532-58-3
2807-30-9
3522-94-9
3737-00-6
4050-45-7
4461-48-7
4885-02-3
5796-89-4
5989-27-5
5989-54-8
6443-92-1
7642-04-8
7642-09-3
7688-21-3
10061-01-5
10061-02-6
12002-48-1
13269-52-8
13466-78-9
14686-13-6
17301-94-9
17700-09-3
25167-67-3
25167-93-5
25321-22-6
25323-30-2
25619-60-7
26446-77-5
26952-23-8
27134-26-5
27195-67-1
27900-75-0
28699-88-9
28729-52-4
28807-97-8
29224-55-3
29733-70-8
29797-40-8
30025-33-3
30498-63-6
30583-33-6
30677-34-0
32368-69-7

4
Chemical Name
4-METHYLOCTANE
ACETYL NITRO PEROXIDE
CIS-1.3-OIMETHYL CYCLOPENTANE
2-PROPOXY ETHANOL
2,2,5-TRIMETHYLHEXANE
3-BROMO- 1 -CHLORO- 1 -PROPENE
(E)-2-HEXENE
4-METHYL-2-PENTENE
DICHLOROMETHOXYMETHANE
NITRO-1-OXOPROPYLPEROXIDE
(R)-1-METHYL-4-(1-METHYLETHENYL)-CYCLOHEXENE
(S)-1-METHYL-4-(1-METHYLETHENYL)-CYCLOHEXENE
(Z)-2-HEPTENE
(Z)-2-QCTENE
(Z)-3-HEXENE
(Z)-2-HEXENE
(Z)-1,3-DICHLORO-1 -PROPENE
(E)-1 ,3-DlCHLORO-l -PROPENE
TRtCHLOROBENZENE
(E)-3-HEXENE
3J,7-TRIMETHYLBICYCLO[4.1.0}HEPT-3-ENE
(E)-2-HEPTENE
4-METHYLNONANE
TETRACHLOROBENZENE
BUTENE
CHLORONITROBENZENE
DICHLOROBENZENE
DICHLOROETHENE
TETRAMETHYL BENZENE
BROMOPROPANE
DICHLORO-1 -PROPENE
CHLOROBENZENEAMINE
DIMETHYLCYCLOHEXANE
DICHLORONITROBENZENE
DICHLORONAPHTHALENE
DIMETHYLCYCLOPENTANE
BROMOMETHYLBENZENE
ETHYL DIMETHYL BENZENE
TETRACHLOROMETHYLBENZENE
DICHLOROMETHYLBENZENE
BENZENEDICARBOXALDEHYDE
TRIMETHYLCYCLOHEXANE
TRICHLOROMETHYLBENZENE
ETHYLMETHYLCYCLOHEXANE
BENZOYL NITRO PEROXIDE
(continued)
10

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Table 1. (Continued)
Data
Base
Chem-
ical
No.
316
317
318
319
320
Chemical
Abstracts
System
Number
34652-54-5
55162-35-1
55880-77-8
67708-83-2
79504-02-2
Chemical Name
BROMOCHLOROPROPANE
1, 1 -DIBROMO-2-CHLOROPROPANE
PENTACHLORO- 1 ,3-BUTADIENE
DIBROMOCHLOROPROPANE
BROMOPENTACHLOROETHANE
   Table 2. dBASE III Plus File Structure
    CONCENTRATION FILE
    Reference Number
    Site Number
    Chemical Number
    Concentration (in parts per billion)
    Relative Standard Deviation
    Number of Samples
    Sampling Duration
    Maximum Concentration
    Minimum Concentration
    Start Date
    Start Time
    Stop Date
    Stop rime
    Hours Between Sampling and Analysis
    Number of Samples Less Than The Minimum
     Quantifiable Level
    Comments
    Ranking
    Rating
METHODS FILE
Reference Number
Site Number
Chemical Number
Sampling Method
Analysis Method
Minimum Quantifiable Level

SITE FILE
Reference Number
Site Number
Site Type
Latitude
Longitude
Site Address
C/ly
State
SAROAD Number
                                                     REFERENCE FILE
                                                     Reference Number
                                                     Chemicals Measured
                                                     Principal Investigator
                                                     Authors
                                                     Title
                                                     Citation
                                                     Year
                                                     Number of Data Records
                                                     Objective	
                                                              * U.S.  Govtrnnunt Printing Office:  IBM—505-007/67127  2-1
                                               11

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  The complete report consists of paper copy and diskettes, entitled  "National
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