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CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 <br /> Certificate#2480 Fax: (209)384-1507 <br />' Advanced GeoEnvironmental, Inc. Client Project ID: Grewals Market Method: EPA 5030i8015M,8020 <br /> of Northern California Reference Number:6566 Instrument ID: Var-GC1 <br /> 837 Shaw Road Sample Description:Water Extracted:01-27-04 <br /> Stockton,CA 95215 Analyst: Jim Phillips Analyzed: 01-27-04 <br /> Attn: Tim Cuellar Reported: 02-03-04 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration: 110 2.10 1.32 7,94 1.84 9.22 <br /> Units: ug/L ug/L ug[L ug1L ug1L ug/L <br /> LCS Batch* VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 <br />' 83.7% 114% 106% 97.7% 108% 107% <br /> Surrogate Recovery: 88.9% 109% 109% 109% 109% 109% <br /> tControi Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130 <br /> MSIMSD Batch#: VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 <br /> Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 <br /> MS% Recovery: 89.7% 93.8% 95.5% 93.7% 97.8% 99.4% <br /> Surrogate Recovery: 102% 99.8% 99.8% 99.8% 99.8% 99.8% <br /> MSD% Recovery: 85.2% 93.5% 95.5% 93.6% 102% 100% <br />' Surrogate Recovery: 103% 100% 100% 100% 100% 100% <br /> Relative%Difference: 5.16% 0-3`15% 0.0316% 0.0993% 4.35% 0.662% <br />' Method Blank: ND ND ND ND ND ND <br /> Surrogate Recovery: 103% 105% 105% 105% 105% 105% <br /> The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and <br />' analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS% recovery is used for validation <br /> of sample patch results. Due to matrix_effects,the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br />' ANALYST: APPROVED BY: <br /> Ciac 4C, 0 ame phiRips <br /> Laboratory Director <br />