B Tier 1 Illustrations and Tables

Section 742.APPENDIX B   Tier 1 Illustrations and Tables Section 742.TABLE G   Tier 1 Soil Gas Remediation Objectives for the Outdoor Inhalation Exposure Route a CAS No. Chemical Name Residential (mg/m 3 ) Industrial/Commercial (mg/m 3 ) Construction Worker (mg/m 3 ) 67-64-1 Acetone 750,000 e 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.