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Ile CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Protect ID Pacific Car Wash Method EPA 503018015M,8020 <br /> I of Northern California Reference Number 6259 Instrument Its Var-GC1 <br /> 837 Shaw Road Matrix Soil Extracted 10-29-03 <br /> Stockton CA 95215 Analyst Clan Cone Analyzer! 10-29-03 <br /> Attn Tim Cuellar Reported 11-07-03 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 220 42 0 26 4 159 36 8 184 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> ILCS Batch# VS-0293 VS-0293 VS-0293 VS-0293 VS-0293 VS-0293 <br /> LCS % Recovery 979% 894% 109% 930% 997% 960% <br /> Surrogate Recovery 985% 967% 967% 967% 967% 967% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VS-0293 VS-0293 VS-0293 VS-0293 VS-0293 VS-0293 <br /> MS %Recovery 6620/a 641% 714% 692% 758% 734% <br /> Surrogate Recovery 746% 738% 738% 73 8% 738% 738% <br /> MSD% Recovery 693% 718% 81 8% 705% 739% 721% <br /> Surrogate Recovery 737% 728% 728% 728% 728% 728% <br /> Retative % Difference 460% 102% 134% 1 90% 248% 1 78% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 929% 963% 963% 963% 963% 963% <br /> Please Note <br /> The LCS (Laboratory Check Sample} is a control sample of known interferent free matrix that is fortifled with representative analytes and <br /> analyzed using the same reagents preparation and analytical methods employed forthe samples The LCS%recovery is used for validation <br /> of sample batch results Due to matrix effects the QC limits and recoveries for MS/MSD's are advisory only and are rant used to acrpnt or <br /> reject batch results <br /> ANALYST at APPROVED BY <br /> Clan J Cone Jame C P r!lips <br /> Fn nrriental Lab Director <br /> I <br /> I , <br />