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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Fax (209) 384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Pacific Car Wash Method EPA 503018015M,8020 <br /> of Northern California Reference Number 828 Instrument ID Var GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 82-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 8-2-96 <br /> Attn Tim Cuellar Reported 8-9-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 200 200 200 200 400 <br /> Units mg/kg uglkg ug/kg ug/kg ug/kg <br /> LCS Batch # VG 8026 VB 8026 VB-8026 VB-8026 VB 8026 <br /> LCS % Recovery 98 6% 107% 100% 99 0% 964% <br /> Surrogate Recovery 91 6% 106% 106% 106% 106% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % <br /> MSIMSD Batch # VG 8026 VB 8026 VB 8026 VB-8026 VB 8026 <br /> MS % Recovery 85 2% 81 9% 78 8% 81 4% 784% <br /> Surrogate Recovery 910% 92 7% 92 7% 927% 92 7% <br /> MSD % Recovery 72 2% 825% 77 7% 808% 78 1% <br /> Surrogate Recovery 88 8% 770% 770% 770% 770% <br /> Relative % Difference 156% 0 687% 1 32% 0637% 0 371% <br /> Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 104% 104% 104% 104% 104% <br /> 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY \ <br /> arr J Cone J e hrNrps <br /> nvrronmental Lab Director <br />