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0 TABLE 4 <br /> GEOMATRIX <br /> GROUNDWATER ANALYTICAL RESULTS"' <br /> 1805 Harbor Street <br /> Stockton, California <br /> Concentrations reported in micrograms per liter /L <br /> Monitoring ate t y- <br /> Well Sampled TPHd TPHg Benzene Toluene benzene Xylenes <br /> MW-7 Jun-02 n s n s n s ns ns n s <br /> Jun-04 520 <50 <0 5 063 <0 5 <0 5 <br /> Aug-04 <1001<100 <50 <0 5 <0 5 <0 5 <0 5 <br /> ESL' <br /> (groundwater to NA NA 530 500000 1400 150000 <br /> Indoor air) <br /> WQ06- 100 5 10 150 300 1750 <br /> roundwater <br /> f <br /> Notes <br /> i Samples collected from 1998 through 2002 by ATC Associates, Inc , samples collected June 2004 <br /> by Haley&Aldrich,Inc <br /> 2 Samples analyzed for total petroleum hydrocarbons quantified as diesel(TPHd),total petroleum <br /> hydrocarbons quantified as gasoline(TPHg),and fo benzene,toluene, ethylbenzene,and xylenes <br /> (BTEX)using EPA Method 8020(1998-2000) and 8260B(2004) <br /> 3 Detected analytes in bold <br /> ' 4 <100/<100-TPHd results both with and without a silica gel preparation procedure <br /> 5 ESL=Values from California Regional Water Quality Control Board, San Francisco Bay Region, 2003, Screening <br /> for Environmental Concerns at Sites with Contaminated Soil and Groundwater, Interim Final,July Groundwater <br /> screenmp-level for evaluation of indoor air Impacts Table F-la <br /> 6 WQO's=Water Quality Numerical Limits for Petroleum Fuel Mixtures,Constitutents,and Additives,Central Valley <br /> Regional Water Quality Control Board,April 1, 2004 TPHd and TPHg values are for taste and odor thresholds, <br /> ' benzene, toluene,ethylbenzene,and xylenes values are California primary maximum contaminant levels(MCLS) <br /> for drinking water <br /> Abbreviations <br /> NA=Not accessible <br /> n s =Not sampled <br /> 11Doc_Safe19000s199631CAKTbls 1-4 x1slTable 4 GW Page 3 of 3 <br />