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I <br />' CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br />' Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Protect ID Pacific Pride-West Lane Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2464 Instrument ID Var-GC1 <br />' 4005 North Wilson Way Matrix Sod Prepared 9-2-99 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 9-3-99 <br /> Attn Tim Cuellar Reported 9-15-99 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 220 42 1 30 1 150 365 179 <br /> Units mg/kg ug/kg ug/kg uglkg ug/kg uglkg <br />' LCS Batch # VS-9029 VS-9029 VS-9029 VS-9029 VS 9029 VS-9029 <br />' LCS % Recovery 884% 833% 764% 95 0% 988% 933% <br /> Surrogate Recovery 107% 106% 106% 106% 106% 106% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VS 9029 VS 9029 VS-9029 VS-9029 VS-9029 VS-9029 <br />' MS % Recovery 526% 430% 589% 594% 644% 607% <br /> Surrogate Recovery 756% 748% 748% 748% 748% 748% <br /> MSD % Recovery 457% 463% 704% 623% 62 5% 59 3% <br />' Surrogate Recovery 71 5% 705% 705% 70 5% 705% 705% <br /> Relative % Difference 13 1% 510% 167% 4 71% 285% 2 17% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 100% 101% 101% 101% 101% 101% <br /> Please Note <br />' The LCS (Laboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative an <br /> 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 batch results Due to matrix effects, the OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ANALYST (tet APPROVED BY � f <br /> C! r J Cone Ja es-C Phillips <br /> . nvrronmental Lab Director <br /> 1 <br /> 1 <br />