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i <br /> I 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 Project ID Pacific Car Wash Method EPA 503018015M,8020 <br /> of Northern California Reference Number 5946 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Soil Extracted 08-01-03 <br /> Stockton, CA 95215 Analyst Clan Cone Analyzed 08-01-03 <br /> Attn Tim Cuellar Reported 08-11-03 <br /> QUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 220 42 0 264 159 368 184 <br /> Units mg/kg ug/kg ug/kg uglkg ug/kg ug/kg <br /> ILCS Batch# VS-8013 VS-8013 VS-8013 VS-8013 VS-8013 VS-8013 <br /> LCS % Recovery 955% 102% 106% 947% 100% 985% <br /> Surrogate Recovery 993% 980% 980% 980% 980% 980% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> • MS/MSI) Batch# VS-8013 VS-8013 VS-8013 VS-8013 VS-8013 VS-8013 <br /> MS% Recovery 737% 113% 908% 880% 930% 920% <br /> Surrogate Recovery 915% 904% 904% 904% 904% 904% <br /> MSD% Recovery 812% 119% 104% 912% 981% 958% <br /> Surrogate Recovery 973% 956% 956% 956% 956% 956% <br /> Relative% Difference 912% 533% 136% 353% 526% 408% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 939% 960% 960% 960% 960% 960% <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 QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> Clan Cone Ja e C Phrlhps <br /> vlronmental Lab Director <br />