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t CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone 12091 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 2549 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 10-23-99 <br /> Stockton CA 95205 Analyst Jim Phillips Analyzed 10-23-99 <br /> Attn Tim Cuellar Reported 11-10-99 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 222 1 34 7 82 1 84 948 <br /> Units uglL ug/L uglL ug1L ug/L ug/L <br />' LCS Batch # VW 0239 VW 0239 VW-0239 VW-0239 VW-0239 VW-0239 <br /> LCS % Recovery 92 5% 109% 108% 95 3% 994% 887% <br />'ie Surrogate Recovery 102% 999% 999% 999% 99 9% 999% <br /> Control Limits 70 130 % 70-130 % 70 130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VW 0239 VW-0239 VW-0239 VW-0239 VW 0239 VW-0239 <br /> Spike Concentration 110 222 1 34 782 1 84 9 48 <br />' MS % Recovery 942% 155% 123% 964% 101% 91 2% <br /> Surrogate Recovery 105% 106% 106% 106% 106% 106% <br /> MSD % Recovery 962% 110% 129% 994% 102% 93 1% <br /> Surrogate Recovery 104% 107% 107% 107% 107% 107% <br /> Relative % Difference 1 86% 345% 4 10% 306% 0706% 2 00% <br />' Methanol Blank ND ND ND ND ND <br /> ND <br /> Surrogate Recovery 924% 990% 99 0% 990% 990% 990% <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 /> OZ Z��7 <br /> ANALYSTVv W APPROVED BY <br /> Clan d Cone Jame A46ps <br /> Fn onm <br /> ental Lab Director <br />