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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 Top Filling Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 3790 Instrument ID Var-GC1 <br /> 837 Shaw Road Matrix Water Prepared 6-8-01 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 6-8-01 <br /> Attn Tim Cuellar Reported 6-13-01 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 208 128 772 1 84 924 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-6081 VW-6081 VW-6081 VW-6081 VW-6081 VW-6081 <br /> LCS %Recovery 927% 775% 993% 892% 894% 872% <br /> Surrogate Recovery 105% 100% 100% 100% 100% 100% <br /> • Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-6081 VW-6081 VW-6081 VW-6081 VW-6081 VW-6081 <br /> Spike Concentration 110 208 1 28 7 72 1 84 924 <br />' MS%Recovery 924% NA* 104% 102% 105% 106% <br /> Surrogate Recovery 117% 109% 109% 109% 109% 109% <br /> MSD% Recovery 114% 171% 924% 100% 103% 102% <br />' Surrogate Recovery 115% 107% 107% 107% 107% 107% <br /> Relative %Difference 934% 486% 2 81% 0974% 122% 199% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 100% 987% 987% 987% 987% 987% <br />' * <br /> Not calculated due to matnx interferences <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 /> 0 <br /> 12 <br /> `� l' <br /> ANALYST APPROVED BY <br /> Clan J Cone Tamest Phillips <br /> L oratory Director <br />