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i <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> I <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 6242 Instrument ID Vat-GC1 <br /> 837 Shaw Road Matrix Soil Extracted 10-23-03 <br /> Stockton CA 95215 Analyst Clan Cone Analyzed 10-23-03 <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 ug/kg ug/kg ug/kg ug/kg uglkg <br />' LCS Batch# VS-0233 VS-0233 VS-0233 VS-0233 VS-0233 VS-0233 <br />' LCS % Recovery 981% 102% 109% 929% 995% 957% <br /> Surrogate Recovery 996% 972% 972% 972% 972% 972% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VS-0233 VS-0233 VS-0233 VS-0233 VS-0233 VS-0233 <br />' MS% Recovery 631% 749% 757% 633% 670% 647% <br /> Surrogate Recovery 673% 670% 670% 670% 670% 670% <br /> MSD% Recovery 634% 79 1% 765% 653% 689% 662% <br />' Surrogate Recovery 696% 688% 688% 688% 688% 688% <br /> Relative% Difference 0427% 5 41% 0988% 310% 269% 228% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 111% 114% 114% 114% 114% 114% <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.",amnio by +,k ragi&i Diss to mntrty Pffa'`t-zthe Of limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> i <br /> ANALYST , APPROVED BY <br />' Clan J Cone Jam rllrps <br /> En ronmental Lab Director <br /> 1 <br />