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I 11 ' CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333•Shuttle Drive,Atwater,CA 95301. Phone: (209)384-2930 ' Certificate#2480 Fax: (209)384-1507 Advanced GeoE nvi ron mental, Inc. Client Project ID:Grewals Market Method: EPA 503018015M,8020 ' of Northern California Reference Number:4868 Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Extracted: 07-18-02 ' Stockton,CA 95215 Analyst: Jim Phillips Analyzed:07-18-02 Attm Tim Cuellar Reported:07-23-02 1 , QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 Units: ug/L ug1L ug/L ug/L uglL ug/L LCS Batch M VW-7182A VW-7182A VW-7182A VW-7182A VW-7182A VW-7182A LCS%Recovery: 113% 133% 115% 100% 101% 101% Surrogate Recovery: 102% 100% 100% 100% 100% 100% Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch#: VW-7182A VVV-7182A VW-7182A VW-7182A VW-7182A VW-7182A Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 ' MS% Recovery: 125% NA* 109% 94.7% 82.1% 84.0% Surrogate Recovery: 117% 108% 108% 108% 108% 108% MSD% Recovery: 121% NA* 97.4% 89.2% 73.0% 76.4% ' Surrogate Recovery: 119% 110% 110% 110% 110% 110% Relative%Difference: 1.07% NA* 5.64% 5,76% 2.89% 4.69% ' Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 106% 113% 113% 113% 113% 113% Recoveries not calculated due to matrix interference. The LCS(Laboratory Check Sample)is a control sample of known,interferent free matrix that is fortified with representative analytes and ' analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS%recovery is used for validation of sample batch results. Due to matrix effects,the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or reject batch results. • ,.' ANALYST: APPROVED BY: Gla J. Cane J e hiilips aboratory Director