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Ile CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)3842930 ' Certificate#2480 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project ID: Grewals Market Method:EPA 5030/8015M,8020 of Northern California Reference Number:4392 . ' 837 Shaw Road Instrument ID: Var GC1 Sample Description:Water Prepared:01-30-02 Stockton,CA 95215 Analyst: Jim Phillips Analyzed:01-30-02 Attn:Tim Cuellar Reported:02-08-02 ' 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-1302 VW-1302 VW-1302 VW-1302 VW-1302 VW-1302 90.6% 93.8% 110% 100% 106% 102% Surrogate Recovery: 104% 100% 100% 100% 100% 100% Ile Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch#: VW-1302 VW-1302 VW-1302 VW-1302 VW-1302 VW-1302 Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 ' MS%Recovery: 87.4% 78.7% 91.0% 97.6% 99.9% 98.6% Surrogate Recovery: 94.1% 95.4% 95.4% 95.4% 95.4% 95.4% MSD% Recovery: 92.1% 96.4% 107% 102% 106% 103% Surrogate Recovery: 99.1% 97.9% 97.9% 97.9% 97.9% 97.9% Relative%Difference: 5.30% 20.2% 16.0% 4.37% 5.92% 4.33% ' Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 96.7% 96.6% 96.6% 96.6% 96.6% 96.6% I 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. 1 ' ANALYST:--,(-Ae::1e� PPROVED BY: Clan J. Cone J C. Phillips aboratory Director i