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1 CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 ' Certificate#2480 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project ID: Grewals Market Method: EPA 5030I8015M,8020 of Northern California Reference Number:6597 Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Extracted:02-05-04 Stockton, CA 95215 Analyst: Jim Phillips Analyzed:02-05-04 Attn:Tim Cuellar Reported:02-12-04 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: uglL uglL uglL ug1L uglL ugiL LCS Batch#: VW-2054 VW-2054 VW-2054 VW-2054 WV-2054 VW-2054 LCS %Recovery: 90.0% 77.3% 80.6% 87.8% 104% 104% Surrogate Recovery: 103% 102% 102% 102% 102% 102% ' Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch* VW-2054 VW-2054 VVV-2054 VW-2054 VW-2054 VW-2054 Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 ' M5%Recovery: 93.8% 74.5% 79.2% 93.3% 105% 104% Surrogate Recovery: 107% 105% 105% 105% 105% 105% MSD%Recovery: 82.7% 74.7% 72.1% 92.4% 105% 104% ' Surrogate Recovery: 105% 103% 103% 103% 103% 103% Relative% Difference: 12.4% 0.179% 9.47% 0.909% 0.0976% 0.462% ' Method Blank: ND ND ND ND ND ND Surrogate Recovery: 92.7% 94.6% 94.6% 94.6% 94.6% 94.6% 1 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. 1 ' ANALYST: APPROVED BY: Clary J. Cone J es C. Phillips aboratory Director � f