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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 Project ID Pacific Pride/El Dorado Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 3360 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Soil Prepared 12-7-00 <br /> Stockton CA 95205 Analyst Clan Cone Analyzed 12-7-00 <br /> Attn Tim Cuellar Reported 12-18-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 220 41 6 256 154 368 185 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> ' LCS Batch# VS-D070 VS-D070 VS-0070 VS-0070 VS-0070 VS-D070 <br /> ' LCS %Recovery 101% 105% 105% 926% 926% 912% <br /> Surrogate Recovery 100% 968% 968% 968% 968% 968% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VS-D070 VS-D070 VS-D070 VS-D070 VS-D070 VS-D070 <br /> MS%Recovery NA" NA NA NA 1 NA NA <br /> Surrogate Recovery NA NA NA NA NA NA <br /> MSD%Recovery NA NA NA NA NA NA <br /> Surrogate Recovery NA NA NA NA NA NA <br /> Relative%Difference NA NA NA NA NA NA <br /> ' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 944% 949% 949% 949% 949% 949% <br /> 'Not calculated due to matnx interferences <br /> Please Note <br /> The LCS(Laboratory Check Sample}is a control sample of known, interferent free matrix that is fortified with representativeanalytes 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 /> a J Cone ;Eplwonmental <br /> aC hillips <br /> Lab Director <br />