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i <br /> • CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209)384-2930 <br /> ICertificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnviron mental Inc Client Protect ID Pacific Pride-West Lane Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 6212 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Sod Extracted 10-15-03 <br /> Stockton, CA 95215 Analyst Clan Cone Analyzed 10-16-03 <br /> Attn Tim Cuellar Reported 10-30-03 <br /> I <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ISpike Concentration 2 20 42 0 25 4 159 368 184 <br /> Units mg/kg ug/kg uglkg ug/kg ug/kg uglkg <br /> LCS Batch# VS-0153A VS-0153A VS-0153A VS-0153A VS-0153A VS-0153A <br /> I LCS %Recovery 993% 113% 113% 957% 103% 990% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VS-0153A VS-0153A VS-0153A VS-0153A VS-0153A VS-0153A <br /> MS%Recovery 81 4% 1160,10 977% 838% 901% 878% <br /> Surrogate Recovery 91 0% 896% 896% 896% 896% 896% <br /> MSD%Recovery 792% 111% 984% 841% 900% 879% <br /> Surrogate Recovery 91 2% 89 7% 897% 897% 897% 897% <br /> Reiative%Difference 270% 426% 0772% 0282% 0119% 0147% <br /> Methanol Blank ND ND ND ND IIID ND <br /> Surrogate Recovery 100% 102% 102% 102% 102% 102% <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 /> i <br /> ANALYST APPROVED BY <br /> Claa one James r lips <br /> Eavt amental Lab Director <br />