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1 <br />' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br />' Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Protect ID Pacific Pride-West Lane Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 3041 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 6-13-00 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 6-14-00 <br /> Attn Tim Cuellar Reported 6-19-00 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 2 20 42 1 301 150 365 179 <br /> Units mg[kg ug/kg ug/kg ug/kg ug/kg ug/kg <br />' LCS Batch# VS-6130A VS-6130A VS-6130A VS-6130A VS-6130A VS-6130A <br />' LCS %Recovery 821% 995% 780% 870% 885% 875% <br /> Surrogate Recovery 822% 831% 831% 831% 831% 831% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> • MS/MSD Batch# VS-6130A VS-6130A VS-6130A VS-6130A V"I30A VS-6130A <br /> MS%Recovery 430% 81 0% 389% 531% 567% 536% <br /> Surrogate Recovery 693% 571% 571% 571% 571% 571% <br /> MSD% Recovery 597% 965% 522% 668% 709% 705% <br /> Surrogate Recovery 671% 666% 666% 666% 666% 666% <br /> Relative% Difference 300% 153% 259% 220% 219% 265% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 770% 802% 802% 802% 802% 802% <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 sample batch results Due to matrix effects,the OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYST —TA APPROVED BY <br /> Clan J Cone Jame C rips <br /> En ronmental Lab Director <br />