Ill. Admin. Code tit. 35, pt. 742, subpt. L, app B, tbl. G

Current through Register Vol. 48, No. 49, December 6, 2024

Table G - Tier 1 Soil Gas Remediation Objectives for the Outdoor Inhalation

Exposure Route^a

CAS No.	Chemical Name	Residential (mg/m³)	Industrial/Commercial (mg/m³)	Construction Worker (mg/m³)
67-64-1	Acetone	750,000e	750,000^e	750,000^e
71-43-2	Benzene	420^c	800^c	1,100^c
111-44-4	Bis(2-chloroethyl)ether	1.3^c	2.4^c	3.4^c
75-27-4	Bromodichloromethane	450,000^e	450,000^e	450,000^e
75-25-2	Bromoform	1,800^c	3,500^c	4,900^c
71-36-3	Butanol	29,000^e	29,000^e	29,000^e
78-93-3	2-Butanone (MEK)	380,000^e	380,000^e	15,000^b
75-15-0	Carbon disulfide	1,500,000^e	1,500,000^e	48,000^b
56-23-5	Carbon tetrachloride	290^c	550^c	770^c
108-90-7	Chlorobenzene	36,000^b	57,000^b	3,700^b
124-48-1	Chlorodibromomethane	57,000^e	57,000^e	150^b
67-66-3	Chloroform	110^c	200^c	290^c
95-57-8	2-Chlorophenol	17,000^e	17,000^e	17,000^e
75-99-0	Dalapon	1,500^e	1,500^e	1,500^e
96-12-8	1,2-Dibromo-3-chloropropane	0.14^c	0.27^c	0.38^c
106-93-4	1,2-Dibromoethane	2.9^c	5.6^c	7.9^c
95-50-1	1,2-Dichlorobenzene	11,000^e	11,000^e	6,700^b
106-46-7	1,4-Dichlorobenzene	8,400^e	8,400^e	6,400^b
75-71-8	Dichlorodifluoromethane	890,000^b	1,400,000^b	92,000^b
75-34-3	1,1-Dichloroethane	870,000^b	1,300,000^e	90,000^b
107-06-2	1,2-Dichloroethane	67^c	130^c	180^c
75-35-4	1,1-Dichloroethylene	520,000^b	820,000^b	5,300^b
156-59-2	cis-1,2-Dichloroethylene	1,100,000^e	1,100,000^e	1,100,000^e
156-60-5	trans-1,2-Dichloroethylene	120,000^b	190,000^b	12,000^b
78-87-5	1,2-Dichloropropane	240^c	470^c	110^c
542-75-6	1,3-Dichloropropylene (cis + trans)	1,900^c	3,700^c	1,400^c
123-91-1	p-Dioxane	16^c	30^c	42^c
100-41-4	Ethylbenzene	59,000^e	59,000^e	8,500^b
76-44-8	Heptachlor	0.40^c	0.76^c	1.1^c
118-74-1	Hexachlorobenzene	0.26^c	0.28^e	0.28^e
77-47-4	Hexachlorocyclopentadiene	85^b	140^b	440^b
67-72-1	Hexachloroethane	2,800^e	2,800^e	2,800^e
78-59-1	Isophorone	3,400^e	3,400^e	1,500^b
98-82-8	Isopropylbenzene (Cumene)	30,000^e	30,000^e	30,000^e
7439-97-6	Mercury^f	22^e	22^e	0.62^b
74-83-9	Methyl bromide	12,000^b	19,000^b	2,400^b
1634-04-4	Methyl tertiary-butyl ether	1,200,000^e	1,200,000^e	23,000^b
75-09-2	Methylene chloride	6,100^c	12,000^c	5,100^b
91-57-6	2-Methylnaphthalene	530^e	530^e	530^e
95-48-7	2-Methylphenol (o-cresol)	1,800^e	1,800^e	410^b
91-20-3	Naphthalene	560^b	620^e	5.8^b
98-95-3	Nitrobenzene	6.5^c	12^c	10^b
621-64-7	n-Nitrosodi-n-propylamine	0.056^c	0.11^c	0.15^c
108-95-2	Phenol	1,500^e	1,500^e	79^b
1336-36-3	Polychlorinated biphenyls (PCBs)	---^d	---^d	---^d
100-42-5	Styrene	34,000^e	34,000^e	16,000^b
127-18-4	Tetrachloroethylene	360^c	690^c	970^c
108-88-3	Toluene	140,000^e	140,000^e	50,000^b
120-82-1	1,2,4-Trichlorobenzene	1,000^b	1,600^b	110^b
71-55-6	1,1,1-Trichloroethane	870,000^e	870,000^e	89,000^b
79-00-5	1,1,2-Trichloroethane	170,000^e	170,000^e	170,000^e
79-01-6	Trichloroethylene	1,700^c	3,300^c	1,500^b
75-69-4	Trichlorofluoromethane	2,100,000^b	3,400,000^b	220,000^b
108-05-4	Vinyl acetate	160,000^b	250,000^b	1,600^b
75-01-4	Vinyl chloride	780^c	3,000^c	3,000^b
108-38-3	m-Xylene	52,000^e	52,000^e	3,100^b
95-47-6	o-Xylene	41,000^e	41,000^e	2,600^b
106-42-3	p-Xylene	55,000^e	55,000^e	3,300^b
1330-20-7	Xylenes (total)	49,000^e	49,000^e	2,900^b

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 C_v^sat value of the chemical in soil gas. The C_v^sat of the chemical becomes the remediation objective if the calculated value exceeds the C_v^sat 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.

Ill. Admin. Code tit. 35, pt. 742, subpt. L, app B, tbl. G

Added at 37 Ill. Reg. 7506, effective May 15, 2013