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4 E� CLEANUP AND ABA' ..cNT�ORDER NO. 92-707 -$- <br /> AMENDING CLEANUP AND ABATEMENT ORDER NO. 91-720 <br /> I� FOR SOUTHERN PACIFIC TRANSPORTATION COMPANY, <br /> TRACY YARD, SAN JOAQUIN COUNTY <br /> c. extractable concentrations of carcinogenic pollutants such that the following <br /> sum is less than 1.0 for carcinogenic pollutants listed in.(b) above: <br /> j n (concentration of pollutant)! <br /> F <br /> i=1 (Cleanup Level for,pollutant)! <br /> E ., <br /> 2. ground waters in situ contain ! <br /> E, : f <br /> E; a. concentrations of total petroleum hydrocarbons (TPH) as diesel which are the <br /> f! lowest concentrations that are technologically and economically achievable and" <br /> !� which are less than1100 micrograms per liter (µg/l) at and downgradient of the <br /> u point of compliance, which is the hydraulically downgradient limit of the TPCA' <br /> impoundment and each additional on-site pollution source, andf <br /> b. concentrations-of'pollutants which are the lowest concentrations that are <br /> ctechnologically and economically achievable and which are' less than the <br /> following cleanup levels at, and downgradient of, the point of compliance, which <br /> 'i is the hydraulically downgradient limit of each on-site pollution source: <br /> E <br /> Cleanup <br /> Pollutant Level Units <br /> �I <br /> chromium 50 µg/l <br /> E <br /> lead 15 µg/l <br /> ' acenaphthene': 20 µg/l ; <br /> € acetone 700 µg/l <br /> benzene 1'.0.T' µg11 `. } <br /> I <br /> bromodichloromethane 1.4 µg11 <br /> 2-butanone (methyl ethyl ketone) 200 µg11 <br /> �I <br /> 1,3-dichlorobenzene 20 µg/l <br /> 1,1-dichloroethane 5 µg/1 <br /> I� 1 ,1-dichloroethylene 0.06 µg11 <br /> j <br />