AttachmentC_ComparisonOfIMACsToProposedGWStandards

IMACs to GW Standards Summary
Pollutant CAS # Original IMAC µg/L Proposed GW Standard µg/L Basis for value
Acetic acid 64-19-7 5,000 5,000 Noncancer threshold concentration (literature RfD)
Acetochlor 34256-82-1 100 100 Noncancer threshold concentration
(EPA IRIS RfD)
Acetochlor ESA 187022-11-3 1,000 500 () Noncancer threshold concentration (literature RfD)
Acetochlor OXA 184992-44-4 1,000 500 () Noncancer threshold concentration
(literature RfD)
Acetophenone 98-86-2 700 700 Noncancer threshold concentration (EPA IRIS RfD)
Acrolein 107-02-8 4 4 Noncancer threshold concentration (EPA IRIS RfD)
Alachlor 15972-60-8 0.4 2 (↑) Federal MCL
Aldrin 309-00-2 0.002 0.002 10-6 cancer risk (EPA IRIS CSF)
Antimony and compounds** Various 1 1 Noncancer threshold concentration (EPA IRIS RfD) Benzaldehdye 100-52-7 700
Benzyl Alcohol 100-51-6 700 700 Noncancer threshold concentration (EPA PPRTV p-RfD)
Beryllium and compounds** Various 4 4 Federal MCL
Bromomethane (methylene bromide) 74-839-9 10 10 Noncancer threshold concentration
(EPA IRIS RfD)
Butanol-n 71-36-3 700 590 () Aqueous odor threshold (non-health based)
Butanol-sec 78-92-2 10,000 10,000 Noncancer threshold concentration (EPA PPRTV p-RfD)
Carbazole 86-74-8 2 Recommend withdrawal of IMAC (PQL= 10)
Chlorotoluene, 4- 106-43-4 24 24 Aqueous odor threshold (non-
health based)
Cobalt and compounds** Various 1 1 Noncancer threshold concentration (EPA PPRTV p-RfD)
Dalapon 75-99-0 200 200 Noncancer threshold concentration (EPA IRIS RfD)
Dibenzofuran 132-64-9 28 Recommend withdrawal of IMAC (PQL = 10)
Dibromobenzene, 1,4- 106-37-06 70 70 Noncancer threshold concentration (EPA IRIS RfD) Dibromomethane 74-95-3 70
Dichloroacetic acid 79-43-6 0.7 0.7 10-6 cancer risk (EPA IRIS CSF)
Dichlororothene, 1,2- (cis isomer) Dichloroethene, 1,2- (trans isomer)
156-59-2 156-60-5 60 (for mixture)
14 () 100 (↑)
Withdraw IMAC for
mixture

Noncancer threshold concentration (EPA IRIS RfD) Federal MCL
2,4-Dichlorophenol 120-83-2 0.98 0.98 Aqueous taste threshold (non-health based)
p,p'-DDE 72-55-9 0.1 0.1 10-6 cancer risk (EPA IRIS CSF)
Dinoseb 88-85-7 7 7
Noncancer threshold concentration
(EPA IRIS RfD) Federal MCL
2,4-Dinitrotoluene 121-14-2 0.1 0.05 () 10-6 cancer risk (EPA IRIS CSF) for technical grade mixture
IMACs to GW Standards Summary

2,6 Dinitrotoluene 606-20-2 NONE 0.05 10-6 cancer risk (EPA IRIS CSF) for technical grade mixture
Diphenyl ether 101-84-8 100 180 (↑) Aqueous odor threshold (non-health based)
Diquat 85-00-7 20 20

Noncancer threshold concentration (EPA IRIS RfD) Federal MCL
Endosulfan Sulfate 115-29-7 40 40 Noncancer threshold concentration
(EPA IRIS RfD)
Endothall 145-73-3 100 100 Noncancer threshold concentration
(EPA IRIS RfD)
Ethanol 64-17-5 4000 Requires further discussion
alpha-Hexachlorocyclohexane 319-84-6 0.006 0.006 10-6 cancer risk (EPA IRIS CSF)
beta-Hexachlorocyclohexane 319-85-7 0.02 0.02 10-6 cancer risk (EPA IRIS CSF)
Hexanone, 2- (methyl butyl ketone) 591-78-6 40 40 Noncancer threshold concentration
(EPA IRIS RfD)
Isopropyltoluene, 4- 99-87-6 25 25 Aqueous odor threshold (non-health based)
Methyl Isobutyl Ketone 108-10-1 100 100 Noncancer threshold concentration (California EPA corrected RfD)
Methyl methacrylate 80-62-6 25 25 Aqueous odor threshold (non-health based)
Methylnapthalene, 1- 90-12-0 1 1 10-6 cancer risk (EPA PPRTV p-
CSF)
Methylphenol, 2- 95-48-7 400 400 Noncancer threshold concentration
(EPA IRIS RfD)
Perflourooctane sulfonic acid 1763-23-1 NONE 0.07 EPA Health Advisory Level (noncancer endpoint)
Perfluorooctanoic acid 335-67-1 2 0.07 ( ) EPA Health Advisory Level (noncancer endpoint)
Picramic acid 96-91-3 0.7 Recommend withdrawal of IMAC (PQL not
identified)

Polychlorinated biphenyls 1336-36-3 0.09
Propylene Glycol 57-55-6 140,000
Strontium and compounds** Various NONE 2,000 Noncancer threshold concentration (EPA IRIS RfD)
tert-Amyl Methyl Ether 994-05-8 128
Tetrachlorobenzene, 1,2,4,5- 95-94-3 2
Tetrachloroethane,1,1,1,2- 630-20-6 1 1 10-6 cancer risk (EPA IRIS CSF)
Thallium and compounds** Various 0.2 2 (↑) Federal MCL
Tin (Inorganic forms)** Various 2,000 2,000 Noncancer threshold concentration (HEAST RfD)
Tin (Organic forms)** Various NONE Discussion pending with DWM and DHHS
p-Toluic acid 99-94-4 35 35 Noncancer threshold concentration (EPA PPRTV p-RfD) Trichloroethane, 1,1,2- 79-00-5 0.6 0.6 10-6 cancer risk (EPA IRIS CSF)
Trichlorophenol, 2,4,5- 95-95-4 63 63 Noncancer threshold concentration (EPA IRIS RfD)
Trichlorophenol, 2,4,6- 88-06-2 4 4 10-6 cancer risk (EPA IRIS CSF)
Vanadium and compounds Various 0.3 10 Non-cancer threshold(CalEPA)
Vinyl acetate 108-05-4