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1 <br /> CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384 2930 <br /> Fax 12091384-1507 <br /> Advanced Geo Environmental, Inc Client Project ID Pacific Car Wash Method EPA 503018015M,8020 <br />' of Northern California Reference Number 922 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 11-1-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 11-1-96 <br />' Attn Tim Cuellar Reported 11-7-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 200 200 200 200 400 <br /> Units mglkg ug/kg ug/kg ug/kg uglkg <br /> LCS Batch ## VG N016 VB N016 VB-N016 VB-N016 VS N016 <br />' LCS % Recovery 100% 107% 113% 109% 112% <br /> Surrogate Recovery 119% 115% 115% 115% 115% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70 130 % 70-130 % <br /> MS/MSD Batch ## VG-NO16 VB N016 VB-NO16 VB N016 VB N016 <br /> MS % Recovery 71 1% 85 1% 72 2% 80 7% 762% <br /> Surrogate Recovery 82 1% 84 1% 84 1% 841% 841% <br /> MSD % Recovery 702% 85 9% 746% 81 9% 740% <br /> Surrogate Recovery 77 8% 854% 854% 854% 85 4% <br /> Relative % Difference 1 08% 0 936% 2 03% 1 26% 1 62% <br /> I Methanol Blank NO NO ND ND ND <br /> Surrogate Recovery 110% 108% 108% 108% 108% <br /> Please Note <br /> The LCS (Laboratory Check Samplel 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 /> ul Sdn1F11C uaicn resuizs Due io mairix eTTecis, ine UL, mmas ana recoveries Tor rVIJ11v6D S die duvibvey Uniy dnu dre nut ubuu to dt.Gt!PL ur <br /> refect batch results <br /> 0�ANALYST "tlo / APPROVED BY <br /> Clary J Cone mes C Phillips <br /> Environmental Lab Director <br /> I <br /> I <br />