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'I • 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 ID:Grewal's Market Method: EPA 5030/8015M,8020 of Northern California Reference Number: 3191 Instrument ID:Var-GC1 4005 North Wilson Way Matrix:Water Prepared: 9-7-00 Stockton,CA 95205 Analyst: Jim Phillips Analyzed: 9-7-00 Attn:Tim Cuellar Reported: 9-13-00 ' 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-9070 VW-9070 VW-9070 VW-9070 VW-9070 VW-9070 I LCS %Recovery: 101% 123% 98.2% 94.9% 96.7% 91.5% Surrogate Recovery: 100% 96.8% 96.8% 96.8% 96.8% 96.8% ' • Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% I ' MS/MSD Batch#: VW-9070 VW-9070 VW-9070 VW-9070 VW-9070 VW-9070 Spike Concentration: 110 2.08 1.28 7,72 1.84 9.24 MS%9 Recovery: 103% 112% 107% 97.3% 97.3% 92.2% Surrogate Recovery: 104% 101% 101% 101% 101% 101% ' MSD%Recovery: 109% 118% 99.5% 97.8% 98.6%a 94.4% Surrogate Recovery: 105% 102% 102% 102% 102% 102% Relative%Difference: 5.74% 5.17% 7.63% 0.512% 1.35% 2.37% ' Methanol Blank: ND ND NO ND ND NO Surrogate Recovery: 96.2% 96.9% 96.9% 96.9% 96.9% 96.9% ' 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 MSIMSD's are advisory only and are not used to accept or reject batch results. If ANALYST: APPROVED BY: Clan J. Cone Ja C.'Phillips nvironmental Lab Director 1