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California Regional Water Quality Control Board <br /> Central Valley Region <br /> Steven T.Butler,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-81. t <br /> 20 November 2000 <br /> Ms. Margaret Russell <br /> c/o Mr. John Welch <br /> P.O. Box 690757 <br /> Stockton, CA 95269 <br /> WORK PLAN FOR ADDITIONAL INVESTIGATION, FORMER KARLSON TRUCKING, <br /> MANTECA, SAN JOAQUIN COUNTY <br /> We have reviewed the 25 October 2000 semiannual monitoring report submitted by Geo-Phase <br /> Environmental for the former Karlson Trucking (KT) site in Manteca. The report presents the results of <br /> groundwater sampling conducted in October and recommends additional grab groundwater sampling to <br /> define the lateral extent of groundwater pollution by total petroleum hydrocarbons as diesel (TPHd). The <br /> report also recommends onsite disposal of purge water and drill cuttings from well installation in <br /> March 2000. <br /> We concur with the recommendation to collect grab groundwater samples to define the lateral extent of <br /> TPHd pollution in groundwater. Therefore,by 29 December 2000,please submit a work plan for grab <br /> groundwater sampling. <br /> To evaluate the appropriateness of onsite disposal of purge water and drill cuttings, we used Dr. Jon <br /> Marshack's The Designated Level Methodology For Waste Classification And Cleanup Level <br /> Determination (DLM), which is available on our website shown on the letterhead above. The DLM <br /> states that Total Designated Levels (TDL) represent total concentrations of constituents in a solid waste <br /> or total or dissolved concentrations of constituents in a liquid waste which threaten to degrade water <br /> quality if equaled or exceeded. The DLM gives the TDL formulas as follows: <br /> Total Designated Level, Liquid(TDLL) for a constituent of a liquid waste, expressed in milligrams of <br /> total or dissolved constituent per liter of waste: <br /> TDLL (mg/l) = Water quality goal (mg/1)x Environmental Attenuation Factor (EAF) <br /> Total Designated Level, Solid(TDLS) for a constituent of a solid waste, expressed in milligrams of a <br /> constituent per kilogram of waste: <br /> TDLS(mg/kg) = Water quality goal (mg/1)x EAF x Leachability Factor (LF) <br /> LF= Total Concentration/Leachable Concentration <br /> California Environmental Protection Agency <br /> Ca Recycled Paper <br />