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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Fax 12091384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1346 Instrument ID Var-GC1 <br /> 4005 N Wilson Way Matrix Soil Prepared 11-26-97 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 11-28-97 <br />' Ann Tim Cuellar Reported 12-3-97 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 200 200 200 200 200 400 <br />' Units mglkg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-N267 VB-N267 VB-N267 VB-N267 VB-N267 VB-N267 <br />' LCS % Recovery 92 0% 106% 105% 107% 103% 107% <br /> Surrogate Recovery 112% 109% 109% 109% 109% 109% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> NIS/MSD Batch # VG-N267 VB-N267 VB-N267 VB-N267 VB-N267 VB-N267 <br />' MS % Recovery 73 2% 847% 82 5% 876% 814% 824% <br /> Surrogate Recovery 91 9% 88 1% 88 1% 88 1% 88 1% 88 1% <br />' MSD % Recovery 724% 86 5% 83 8% 82 9% 805% 78 1% <br /> Surrogate Recovery 91 0% 91 1% 91 1% 91 1% 91 1% 91 1% <br /> Relative % Difference 1 1 1% 2 10% 1 56% 537% 1 14% 505% <br /> tMethanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 113% 113% 113% 113% 113% 113% <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 ettects, the QC iimits ana recoveries for iviSoviSD 5 are advisoFy only and aro' iwt used tis accept Or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clan J Cone Jame dlrps <br /> En ronmental Lab Director <br />