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! 14*SM <br /> • TABLE 4 ©EOMATRIX <br /> GROUNDWATER ANALYTICAL RESULTSt,z <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 /> Se -00 <50 <50 <0 5 ---_ <0 5 <0 5mm mm _<0 5- <br /> Dec-00 <50 <50 <0 5 _ <0 5 <0 5 _ <0 5 <br /> Mar-O 1 <50 <50 <0 5 <0 5 <0 5_ <0 5 <br /> Jun-01 <50 <50 <0 5 <0 5 _ _ <0 5 <0 5 _ <br /> ' <br /> Sep-0 I <50 _<50 <0 5 <0 5 —_<O 5 <0 5 <br /> Dec-01 <50 <50 <0 5 _ _ <0 5_ _ _<0 5 _<1 0__ <br /> Apt-02 <50 <50 <0 5 <0 5 _ <0 5_ <1 0 <br /> ' Jun-02 <50 <50 <0 5 —_ - -<0 5 _ <0 5_ <1 0 <br /> Jun-04 170 <50 <0 5 <0 5 <0 5_ <0 5 <br /> Au •04 <100/<100 <50 <0 5_ _<0 5 _ <0 5 1 0_5 <br /> ' Nov-04 <50 — _- <50 �<0 5 <0 5 _— —- <0 5 _--_—<0 5 -- <br /> MW-7 Jun-02 ns ns ns ns ns_ ns <br /> Jun-04 520 <50 <0 5 _ 063 <0 5 <0 5 <br /> Aug-04 <100/<100 <50 <0 5 <0 5 <0 5 <0 5 <br /> ' Nov-04 180 <50 <0 5- -- <0 5 -- -- <0 5 _ _ <0 5 <br /> Dec-04 140/<100 <50 NA NA NA NA <br /> W Os-Groundwater 100 5 10 150 300 1750 <br /> t Notes <br /> Samples collected from 1998 through 2002 by ATC Associates, Inc, samples collected June 2004 <br /> ' by Haley&Aldrich, Inc <br /> 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 /> a Detected analytes in bold <br /> <100/<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 /> ' 11Project19000s19963 00114th qtr 2004103 tbls xls Page 6 of 6 <br /> 13 <br /> 1 <br />