Section 742.APPENDIX B Tier 1 Illustrations and Tables

Section 742.TABLE H Tier 1 Soil Gas and Groundwater Remediation Objectives for the Indoor Inhalation Exposure Route – Diffusion and Advection^j

Q_soil equals 83.33 cm³/sec^a

		Soil Gas		Groundwater
CAS No.	Chemical Name	Residential (mg/m³)	Industrial/ Commercial (mg/m³)	Residential (mg/L)	Industrial/ Commercial (mg/L)
67-64-1	Acetone	750,000^f	750,000^f	1,000,000^g	1,000,000^g
71-43-2	Benzene	0.37^c	2.8^c	0.11^c	0.41^c
111-44-4	Bis(2-chloroethyl)ether	0.014^c	0.087^c	0.083^c	0.43^c
75-27-4	Bromodichloromethane	450,000^f	450,000^f	6,700^g	6,700^g
75-25-2	Bromoform	11^c	52^c	3.1^c	12^c
71-36-3	Butanol	29,000^f	29,000^f	74,000^g	74,000^g
78-93-3	2-Butanone (MEK)	6,400^b	40,000^b	10,000^b	48,000^b
75-15-0	Carbon disulfide	780^b	5,300^b	67^b	210^b
56-23-5	Carbon tetrachloride	0.21^c	1.5^c	0.020^c	0.076^c
108-90-7	Chlorobenzene	69^b	420^b	26^b	82^b
124-48-1	Chlorodibromomethane	57,000^f	57,000^f	2,600^g	2,600^g
67-66-3	Chloroform	0.11^c	0.92^c	0.07ⁱ	0.15^c
95-57-8	2-Chlorophenol	17,000^f	17,000^f	22,000^g	22,000^g
75-99-0	Dalapon^e	1,500^f	1,500^f	900,000^g	900,000^g
96-12-8	1,2-Dibromo-3-chloropropane^e	0.0012^c	0.0062^c	0.00065^c	0.0027^c
106-93-4	1,2-Dibromoethane	0.0078^c	0.048^c	0.0035^c	0.014^c
95-50-1	1,2-Dichlorobenzene	290^b	1,700^b	140^b	160^g
106-46-7	1,4-Dichlorobenzene	1,200^b	6,800^b	79^g	79^g
75-71-8	Dichlorodifluoromethane	270^b	1,700^b	3.0^b	9.2^b
75-34-3	1,1-Dichloroethane	690^b	4,200^b	180^b	580^b
107-06-2	1,2-Dichloroethane	0.099^c	0.81^c	0.054^c	0.22^c
75-35-4	1,1-Dichloroethylene	240^b	1,600^b	24^b	74^b
156-59-2	cis-1,2-Dichloroethylene	1,100,000^f	1,100,000^f	3,500^g	3,500^g
156-60-5	trans-1,2-Dichloroethylene	85^b	510^b	16^b	51^b
78-87-5	1,2-Dichloropropane	0.31^c	2.3^c	0.12^c	0.48^c
542-75-6	1,3-Dichloropropylene (cis + trans)	0.90^c	6.2^c	0.14^c	0.52^c
123-91-1	p-Dioxane	0.22^c	2.3^c	2.9^c	25^c
100-41-4	Ethylbenzene	1,3^c	9.3^c	0.37^c	1.4^c
76-44-8	Heptachlor	0.0063^c	0.032^c	0.0025^c	0.0096^c
118-74-1	Hexachlorobenzene	0.0087^c	0.057^c	0.0059^c	0.0062^g
77-47-4	Hexachlorocyclopentadiene	0.58^b	2.6^b	0.084^b	0.26^b
67-72-1	Hexachloroethane	2,800^f	2,800^f	50^g	50^g
78-59-1	Isophorone	2,900^b	3,400^f	12,000^g	12,000^g
98-82-8	Isopropylbenzene (Cumene)	600^b	3,500^b	2.7^b	8.4^b
7439-97-6	Mercury^h	0.42^b	2.5^b	0.053^b	0.060^g
74-83-9	Methyl bromide	6.9^b	42^b	1.5^b	4.8^b
1634-04-4	Methyl tertiary-butyl ether	3,700^b	24,000^b	1,900^b	6,800^b
75-09-2	Methylene chloride	5.6^c	45^c	2.1^c	8.2^c
91-57-6	2-Methylnaphthalene	530^f	530^f	25^g	25^g
95-48-7	2-Methylphenol (o-cresol)	600^b	1,800^f	26,000^g	26,000^g
91-20-3	Naphthalene	0.11^c	0.75^c	0.075^c	0.32^c
98-95-3	Nitrobenzene	0.077^c	0.57^c	0.34^c	2.0^c
621-64-7	n-Nitrosodi-n-propylamine	0.0016^c	0.012^c	0.044^c	0.27^c
108-95-2	Phenol	140^b	1,300^b	28,000^b	83,000^g
1336-36-3	Polychlorinated biphenyls (PCBs)	---^d	---^d	---^d	---^d
100-42-5	Styrene	1,400^b	8,500^b	310^g	310^g
127-18-4	Tetrachloroethylene	0.55^c	4.0^c	0.091^c	0.34^c
108-88-3	Toluene	6,200^b	40,000^b	530^g	530^g
120-82-1	1,2,4-Trichlorobenzene	5.4^b	25^b	1.8^b	5.9^b
71-55-6	1,1,1-Trichloroethane	6,600^b	41,000^b	1,000^b	1,300^g
79-00-5	1,1,2-Trichloroethane	170,000^f	170,000^f	4,400^g	4,400^g
79-01-6	Trichloroethylene	1.5^c	12^c	0.34^c	1.3^c
75-69-4	Trichlorofluoromethane	860^b	5,600^b	26^b	82^b
108-05-4	Vinyl acetate	250^b	1,600^b	160^b	550^b
75-01-4	Vinyl chloride	0.29^c	4.8^c	0.028^c	0.21^c
108-38-3	m-Xylene	140^b	850^b	43^b	130^b
95-47-6	o-Xylene	120^b	790^b	40^b	130^b
106-42-3	p-Xylene	130^b	820^b	38^b	120^b
1330-20-7	Xylenes (total)^e	140^b	840^b	30^b	93^b

Chemical Name and Remediation Objective Notations

^a Compliance is determined by meeting either the soil gas remediation objectives or the groundwater remediation objectives. See Sections 742.505 and 742.515.

^bCalculated values correspond to a target hazard quotient of 1.

^cCalculated 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 BOL if calculation of Tier 2 or 3 remediation objectives is desired.

ILLINOIS REGISTER

POLLUTION CONTROL BOARD

NOTICE OF PROPOSED AMENDMENTS ^e Groundwater remediation objective calculated at 25°C. For Dalapon and 1,2-Dibromo-3-chloropropane, the critical temperature (T_c) and enthalpy of vaporization at the normal boiling point (H_v,b) are not available. For Xylenes (total), the enthalpy of vaporization at the normal boiling point (H_v,b) is not available.

^f 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.

^gThe value shown is the solubility of the chemical in water. The solubility of the chemical becomes the remediation objective if the calculated value exceeds the solubility or if there are no toxicity criteria available for the ingestion route of exposure.

^h 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.

ⁱ The value shown is the Groundwater Remediation Objective listed in Appendix B, Table E.

^j Calculated values for the remediation objectives in this table are based on the assumption that the existing or potential building has a full concrete slab-on-grade, though the remediation objectives in this table are also considered protective of occupants of buildings with full concrete basement floors and walls. This table applies only when the existing or potential building has a full concrete slab-on-grade or a full concrete basement floor and walls. Institutional controls under Subpart J are required to use remediation objectives in this table. This table does not apply when the existing or potential building has neither a full concrete slab-on-grade nor a full concrete basement floor and walls, such as a building with an earthen crawl space, an earthen floor, a stone foundation, a partial concrete floor, or a sump. In such cases, site evaluators have the option of excluding the indoor inhalation exposure route under Section 742.312, meeting the building control technology requirements under Subpart L, or proposing an alternative approach under Tier 3.

(Source: Added at 37 Ill. Reg. 7506, effective May 15, 2013)