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TABLE 4 � GEOMATRIX <br /> GROUNDWATER ANALYTICAL RESULTS"" <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 <0.575 <br /> Sep-00' <50 <SQ <0.5 -- <0.5-_ _..<0.5 <0.5" <br /> Dec-00 <50 <50 - <0.5 <0.5 - <0.5-! <0.5 <br /> Mar-Ql <50 <50 <0-5 <0.5 <0.5 ¢©.5 <br /> Jun-01 <50 <50 <0.5 _ <0.5 _ <0.5 - -- <Q.5 <br /> Se -01 <50 -<50 <0.5 <0.5 <0.5 - <0.5 ..- <br /> c l <50 <50 <0.5 .. _ _.._Z0.5_-- ---^<0.5 . .._ <1.0 <br /> Apr-02 <50 <50 <0.5 <br /> Jun-02 <50 <50 <0.5 <0.5 <0.5 T <0.5 <1.0 <br /> Jun-04 170 <50 <0.5 <0.5 <0.5 <0.5 <br /> Aug-04 <100/<100 - <50 <0.5 <0.5 <0.5 <0.5 <br /> Nov-04 <50 <50 -<0.5 <0.5-- - <0.5- - <0.5 <br /> MW-7 Jun-02 n.s. _ n.s. S._ n.s. n.s._ n.s. <br /> Jun-04 520 <50 <0.5 _ 0.63 <br /> Aug-04 <100/<100 <S0 <0.5 <0.5 <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 /> W!205-Groundwater 100 5 1.0 150 300 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 /> 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 /> I:IProject19000s19963.00114th qtr 2004103 tbis.xis Page 6 of 6 <br /> 13 <br />