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Table 1. Designated Levels for Constituents in Soils and Cleanup Goals for Groundwater Western Farm Service, Vernalis Range of Highest Total Designated Range of Highest Water Quality Method Attenuation Leachability 9 Chemical Concentrations in Soil' Concentrations=In Limit'' �Detection Limit Basis for Limit Factor Factor Levels Groundwater Inorganic Compounds Ammonium(as nitrogen) 3,000-9,000 mg/kg 400-600 mg/I 1.5 mgA 0.1 mgA Taste and Odor Threshold250 mg/kg a California Primary MCL for Drinking Water (sum of Nitrate-N Nitrate(as nitrogen) 1,000-3,000 mg/kg 200-800 mgA 10 mgA 2 mgA (DHS) and Ammonium-N) Carbamate/Urea Compounds Bromacil <0.3 mg/kg 1.0-2.0 ugA 90 ugA 1 ugA USEPA Drinking Water Health Advisory 10 10 9,000 ug/kg Chlorpropham 0.37-2.9 mg/kg -5 ugA 350 ugA 5 ugA California Action Level for Toxicity(DHS) 10 10 35,000 ug/kg Diuron 0.22.0.40 mg/kg 35-49 ugA 14 ugA 1 ugA USEPA IRIS Reference Dose for Drinking 10 1 140 ug/kg Water Oryzalin NIS 1.3-1.4 ugA 35 ugA 1 ugA USEPA IRIS Reference Dose for Drinking 10 10 3,500 ug/kg Water Propham 0.59 mg/kg <5 ugA 140 ugA 5 ugA USEPA IRIS Reference Dose for Drinking 10 10 14,000 ug/kg Water Chlorinated Herbicides Dinoseb 0.0057-0.037 mg/kg <0.5 ugA 7 ugA 0.5 ugA (DHS)California Primary MCL for Drinking Water 10 10 700 ug/kg Fumigants Dibromochloropropane NIS 0.6-2.0 ugA 0.0017 ug/I 0.02 ugA OEHHA Public Health Gaal for Drinking Water 10 1 0.02 ug/kg Ethylene dibromide NIS 0.13-0.28 ugA 0.0097 ugA 0.02 ugA CaVEPA Cancer Potency Factor as a Drinking 10 1 0.10 ug/kg Water Level 1,2,3-Trichloropropane NIS 5.0-12.0 ugA 0.005 ugA 0.02 ugA California Action Level for Toxicity(DHS) 10 1 0.05 ug/kg Organochlorine pesticides DDD 0.016 mg/kg <0.05 ugA 0.15 ugA 0.05 ugA CaVEPA Cancer Potency Factor as a Drinking 100 100 1,500 ug/kg Water Level DDE 0.01 mg/kg <0.05 ugA 0.1 ugA 0.05 ugA CaVEPA Cancer Potency Factor as a Drinking 100 100 1,000 ug/kg Water Level DDT 0.069 mg/kg <0.05 ugA 0.1 ugA 0.05 ug/l Cal/EPA Cancer Potency Factor as a Drinking 100 100 1,000 ug/kg Water Level Volatile Organic Compounds Chlorobenzene <0.025 mg/kg 2-3.4 ug/I 20 ugA 0.5 ugA Taste and Odor Threshold 10 1 200 ug/kg Chloroform <0.010 mg/kg 1.3-3.5 ugA 1.1 ugA 0.5 ugA Cal/EPA Cancer Potency Factor as a Drinking 10 1 11 ug/kg Water Level Dibromochloromethane 0.02 mg/kg <0.5 ugA 0.37 ugA 0.5 ugA CaVEPA Cancer Potency Factor as a Drinking 10 1 4 ug/kg Water Level 1,2-Dichloropropane 0.016-3.2 mg/kg 30-70 ugA 0.5 ug/I 0.5 ugA OEHHA Public Health Goal for Drinking Water 10 1 5 ug/kg Methylene Chloride 0.11 mg/kg <5 ugA 4 ugA 5 ugA OEHHA Public Health Goal for Drinking Water 10 1 40 ug/kg Toluene 0.03-0.089 mg/kg NIS ug/I 42 ugA 5 ugA Taste and Odor Threshold 10 1 420 ug/kg Trichloro8ouromethane 0.17 mg/kg <0.5 ugA 150 ugA 0.5 ugA California Primary MCL for Drinking Water 10 1 1,500 ug/kg (DHS) 5 March 2003