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1: t CASTLE ANALYTICAL LABORATORY Environmentai Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 ' Certificate#2480 Fax: (209)384-1507 S Advanced GeoEnviron mental, Inc. Client Project ID: Grewals Market Method: EPA 5030/8015M,8020 of Northern California Reference Number:4521 Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Prepared: 03-27-02 Stockton, CA 95215 Analyst: Jim Phillips Analyzed:03-27-02 Attn:Tim Cuellar Reported: 04-03-02 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 ug/L ug/L ug/L ug/L ug/L LCS Batch#: VW-3272 VW-3272 VW-3272 VW-3272 VW-3272 VW-3272 ' LCS%Recovery: 106%u 104% 109% 103% 111% 107% Surrogate Recovery: 107% 104% 104% 104% 104% 104% ' Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MSIMSD Batch#: VW-3272 VW-3272 VW-3272 VW-3272 VW-3272 VW-3272 Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 ' MS%Recovery: 106% 72.8% 98.1% 103% 112% 109% Surrogate Recovery: 109% 105%a 105% 105% 105% 105% MSD%Recovery: 108% 71.1% 107% 101% 108% 104% ' Surrogate Recovery: 108% 105% 105% 105% 105% 105% Relative%Difference: 2.08% 1.53% 8.58% 2.66% 3.09% 4.96% ' Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 97.4% 100% 100% 900% 100% 100% ' The LCS(Laboratory Check Sample)is a control sample of known,interferent free matrix that is fortified with representative analytes and p Yt 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: Clan J. Cone jyhft.C. Phillips aboratory Director