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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 Project ID Pacific Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1798 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 10-14-98 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 10-16-98 <br /> Attn Tim Cuellar Reported 10-22-98 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 2011 2110 200 200 200 400 <br /> Units mg/kg uglkg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-0148 VB-0148 VS-0148 VB-0148 VB-0148 VB-0148 <br /> LCS % Recovery 882% 938% 978% 984% 960% 89 1% <br /> Surrogate Recovery 83 5% 827% 827% 82 7% 82 7% 82 7% <br /> IControl Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-0148 VB 0148 VB-0148 VB-0148 VB-0148 VB-0148 <br /> MS % Recovery 692% 129% 125% 104% 122% 106% <br /> Surrogate Recovery 747% 102% 102% 102% 102% 102% <br /> MSD % Recovery 768% 173% 137% 134% 138% 122% <br /> Surrogate Recovery 747% 113% 113% 113% 113% 113% <br /> Relative % Difference 947% 17 3% 9 41% 21 3% 12 1% 135% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 772% 76 5% 76 5% 765% 76 5% 76 5% <br /> I Please Note <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 batch results Due to matrix effects,the QC limits and recoveries for MSIMSD s are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED 5Ja <br /> / <br /> Clary J Cone C Phillips <br /> ronmental Lab Director <br />