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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 6258 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Sod Extracted 10-29-03 <br /> Stockton CA 95215 Analyst Clan Cone Analyzed 10-29-03 <br /> Attn Tim Cuellar Reported 11-07-03 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 220 42 0 264 159 368 184 <br /> Units mg/kg uglkg ug/kg ug/kg ug/kg ug/kg <br /> LCS 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 /> lie <br /> MSlMSD Batch# VS-0293 VS-0293 VS-0293 VS-0293 VS-0293 VS-0293 <br />' MS %Recovery 662% 641% 714% 692% 758% 734% <br /> Surrogate Recovery 746% 738% 738% 738% 738% 738% <br /> MSD%Recovery 693% 71 8% 81 8% 705% 739% 721% <br /> Surrogate Recovery 737% 728% 728% 728% 728% 728% <br /> Relative % 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 /> I <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 camnla hatrh racsiitc nnP to mntriY Pffarte tha OC' limits and rPrnvariac fnr MSlMSD's are advisory only and are not used to accent or <br /> refect batch results <br /> I <br /> ANALYST APPROVED BY <br /> Clan J Cone J es Phillips <br /> nvironmental Lab Director <br /> I <br /> 1 <br />