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lie CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: 209 384-2930 ' Certificate#2079 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project 10:Grewal's Market Method:EPA 5030/8015M,8020 of Northern California Reference Number:3848 Instrument ID:Var-GC1 837 Shaw Road Matrix:Water Prepared: 6-25-01 Stockton, CA 95215 Analyst: Jim Phillips Analyzed: 6-25-01 Attn:Tim Cuellar Reported: 7-5-01 1 ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.08 1.28 7.72 1.84 9.24 Units: ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch#: VW-6251 VW-6251 VW-6251 VW-6251 VW-6251 VW-6251 LCS %Recovery: 122% 107% 107% 111% 114% 115% Surrogate Recovery: 109% 105% 105% 105% 105% 105% ' .! Control Limits: 70-130% 70-130% 70-130% 70-130% 70--130% 70-130% 115/MSD Batch#: VW-6251 VW-6251 VW-6251 VW-6251 VW-6251 VW-6251 Spike Concentration: 110 2.08 1.28 7.72 1.84 9.24 MS% Recovery: 112% 98,1% 80.0% 112% 118% 118/0 Surrogate Recovery: 119% 114% 114% 114% 114% 114% MSD%Recovery: 119% 94.1% 83.5% 114% 119% 120% ' Surrogate Recovery: 117% 112% 112% 112% 112% 112% Relative%Difference: 5.61% 2.37% 2.21% 1.68% 1.07% 1.55% ' Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 101% 102% 102% 102% 102% 102% ' The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and P Y 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: Clari J. Cone Ja iilips 6oratory Director