Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 742 - TIERED APPROACH TO CORRECTIVE ACTION OBJECTIVES › Subpart L - BUILDING CONTROL TECHNOLOGIES › Appendix B - Tier 1 Illustrations and Tables › Table G - Tier 1 Soil Gas Remediation Objectives for the Outdoor Inhalation

Current through Register Vol. 48, No. 28, July 12, 2024
Exposure
					 Routea
CAS No.
Chemical Name
Residential
								(mg/m3)
Industrial/Commercial
								(mg/m3)
Construction Worker
								(mg/m3)
67-64-1
Acetone
750,000e
750,000e
750,000e
71-43-2
Benzene
420c
800c
1,100c
111-44-4
Bis(2-chloroethyl)ether
1.3c
2.4c
3.4c
75-27-4
Bromodichloromethane
450,000e
450,000e
450,000e
75-25-2
Bromoform
1,800c
3,500c
4,900c
71-36-3
Butanol
29,000e
29,000e
29,000e
78-93-3
2-Butanone (MEK)
380,000e
380,000e
15,000b
75-15-0
Carbon disulfide
1,500,000e
1,500,000e
48,000b
56-23-5
Carbon tetrachloride
290c
550c
770c
108-90-7
Chlorobenzene
36,000b
57,000b
3,700b
124-48-1
Chlorodibromomethane
57,000e
57,000e
150b
67-66-3
Chloroform
110c
200c
290c
95-57-8
2-Chlorophenol
17,000e
17,000e
17,000e
75-99-0
Dalapon
1,500e
1,500e
1,500e
96-12-8
1,2-Dibromo-3-chloropropane
0.14c
0.27c
0.38c
106-93-4
1,2-Dibromoethane
2.9c
5.6c
7.9c
95-50-1
1,2-Dichlorobenzene
11,000e
11,000e
6,700b
106-46-7
1,4-Dichlorobenzene
8,400e
8,400e
6,400b
75-71-8
Dichlorodifluoromethane
890,000b
1,400,000b
92,000b
75-34-3
1,1-Dichloroethane
870,000b
1,300,000e
90,000b
107-06-2
1,2-Dichloroethane
67c
130c
180c
75-35-4
1,1-Dichloroethylene
520,000b
820,000b
5,300b
156-59-2
cis-1,2-Dichloroethylene
1,100,000e
1,100,000e
1,100,000e
156-60-5
trans-1,2-Dichloroethylene
120,000b
190,000b
12,000b
78-87-5
1,2-Dichloropropane
240c
470c
110c
542-75-6
1,3-Dichloropropylene (cis + trans)
1,900c
3,700c
1,400c
123-91-1
p-Dioxane
16c
30c
42c
100-41-4
Ethylbenzene
59,000e
59,000e
8,500b
76-44-8
Heptachlor
0.40c
0.76c
1.1c
118-74-1
Hexachlorobenzene
0.26c
0.28e
0.28e
77-47-4
Hexachlorocyclopentadiene
85b
140b
440b
67-72-1
Hexachloroethane
2,800e
2,800e
2,800e
78-59-1
Isophorone
3,400e
3,400e
1,500b
98-82-8
Isopropylbenzene (Cumene)
30,000e
30,000e
30,000e
7439-97-6
Mercuryf
22e
22e
0.62b
74-83-9
Methyl bromide
12,000b
19,000b
2,400b
1634-04-4
Methyl tertiary-butyl ether
1,200,000e
1,200,000e
23,000b
75-09-2
Methylene chloride
6,100c
12,000c
5,100b
91-57-6
2-Methylnaphthalene
530e
530e
530e
95-48-7
2-Methylphenol (o-cresol)
1,800e
1,800e
410b
91-20-3
Naphthalene
560b
620e
5.8b
98-95-3
Nitrobenzene
6.5c
12c
10b
621-64-7
n-Nitrosodi-n-propylamine
0.056c
0.11c
0.15c
108-95-2
Phenol
1,500e
1,500e
79b
1336-36-3
Polychlorinated biphenyls (PCBs)
---d
---d
---d
100-42-5
Styrene
34,000e
34,000e
16,000b
127-18-4
Tetrachloroethylene
360c
690c
970c
108-88-3
Toluene
140,000e
140,000e
50,000b
120-82-1
1,2,4-Trichlorobenzene
1,000b
1,600b
110b
71-55-6
1,1,1-Trichloroethane
870,000e
870,000e
89,000b
79-00-5
1,1,2-Trichloroethane
170,000e
170,000e
170,000e
79-01-6
Trichloroethylene
1,700c
3,300c
1,500b
75-69-4
Trichlorofluoromethane
2,100,000b
3,400,000b
220,000b
108-05-4
Vinyl acetate
160,000b
250,000b
1,600b
75-01-4
Vinyl chloride
780c
3,000c
3,000b
108-38-3
m-Xylene
52,000e
52,000e
3,100b
95-47-6
o-Xylene
41,000e
41,000e
2,600b
106-42-3
p-Xylene
55,000e
55,000e
3,300b
1330-20-7
Xylenes (total)
49,000e
49,000e
2,900b
Chemical Name and Remediation Objective Notations
a For the outdoor inhalation
					 exposure route, it is acceptable to determine compliance by meeting either the
					 soil or soil gas remediation objectives. The soil remediation objectives for
					 the outdoor inhalation route are located in Appendix B, Tables A and B.
b Calculated values correspond
					 to a target hazard quotient of 1.
c Calculated values correspond
					 to a cancer risk level of 1 in 1,000,000.
d PCBs are a mixture of
					 different congeners. The appropriate values to use for the physical/chemical
					 and toxicity parameters depend on the congeners present at the site. Persons
					 remediating sites should consult with IEPA Bureau of Land (BOL) if calculation
					 of Tier 2 or 3 remediation objectives is desired.
e The value shown is the
					 Cvsat value of the chemical
					 in soil gas. The Cvsat of the
					 chemical becomes the remediation objective if the calculated value exceeds the
					 Cvsat value or if there are
					 no toxicity criteria available for the inhalation route of exposure.
f Value for the inhalation exposure
					 route is based on Reference Concentration for elemental Mercury (CAS No.
					 7439-97-6). Inhalation remediation objectives only apply at sites where
					 elemental Mercury is a contaminant of concern.