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TABLE 4 GEOMATRix <br /> ' GROUNDWATER ANALYTICAL RESULTS 1,2 <br /> • <br /> 1805 Harbor Street <br /> ' Stockton, California <br /> Concentrations reported in micrograms per liter(µg/L) <br /> Monitoring Date Ethyl- <br /> Well Sampled TPHd TPHg Benzene Toluene benzene Xylenes <br /> MW-6 Jul-00 <50 <50 <0 5 _ <0 5 <0 5_ _<0 5 <br /> ' <br /> Sep-00 <50 <50 <0 5 _ <0 5 ---<0 5 _ _ <0-5 <br /> Dec-00 <50 _ <50 <0 5 _<0 5 <0_5 <0 5 <br /> Mar-O 1 <50 <50 <0 5 w <0 5 - - <05 --<0 5 <br /> ' Jun-01 <50 <50 <0 5 --<O 5 _ _-<0 5 T <O 5 <br /> - .Sep-01 <50 <50 <0 5 <0 5 _ <0 5_ <0 5 <br /> Dec-0l <50 <50 <0 5 _ <0 5_ _ _ _<0 5 _<1 0__ <br /> Apt-02 <50 <50 <0 5 <0 5 <0 5 W <1 0 <br /> ' Jun-02 <50 _ <50 <0 5 <0 5 — _<05- — _<1 0 <br /> Jun-04 170 <50 _<0 5 _ _ _<0 5 <0 5 <0 5_ <br /> Aug-04 <1001<1_00 _<50 <0 5 - <0 5 <05 - - --<05 <br /> ' Nov-04 <50 <50 - --<0 5 <0 5-` - <0 5 <0 5 <br /> MW-7 Jun-02 ns _ n s n s_ ns ns ns <br /> Jun-04 520 _ <50 <0 5�— - 0 63 -- 4_<0 5---- ---<0 5 <br /> ' <br /> Aug-04 <100/<100 _<50 T_ <0 5_ <p 5 _<0 5 _ _ <0 5 <br /> Nov-04 180 <50 <0 5 <0 5 — _ <0_5 _ _ <0 5 <br /> Dec-04 1401<100 <50 NA NA NA NA�� <br /> ' IIWQ05-Groundwater 100 5 10 150 300 1750 <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 for benzene, toluene, ethylbenzene,and xylenes <br /> (BTEX)using EPA Method 8020(1998-2000) and 8260B(2004) <br /> 3 Detected analytes in bold <br /> ' ° <1001<100-TPHd results both with and without a silica gel preparation procedure <br /> 5 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 /> ' dup=duplicate sample <br /> E <br /> ' I g <br /> IProJ ect19000s19963 00114th qtr 2004103 tbls x1s Page 6 of 6 <br /> 13 <br />