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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 Cal Fuels Method EPA 503018015M,8020 <br />' of Northern California Reference Number 2250 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 5-6-99 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 5-6-99 <br /> Attn Tim Cuellar Reported 5-18-99 <br /> 1 <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 9 48 <br /> Units ug/L uglL uglL ug/L uglL ug1L <br /> LCS Batch # VW 5069 VW 5069 VW 5069 VW-5069 VW-5069 VW-5069 <br /> ILCS % Recovery 110% 104% 109% 104% 109% 980% <br /> Surrogate Recovery 104% 102% 102% 102% 102% 102% <br />'OControl Limits 70 130 % 70130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VW-5069 VW-5069 VW 5069 VW-5069 VW 5069 VW-5069 <br /> Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> MS % Recovery 130% 884% 103% 105% 115% 102% <br /> Surrogate Recovery 110% 106% 106% 106% 106% 106% <br /> MSD % Recovery 109% 87 9% 101% 108% 115% 103% <br /> Surrogate Recovery 113% 109% 109% 109% 109% 109% <br /> Relative % Difference 147% 0 519% 1 71% 2 01% 0575% 1 13% <br /> Methanol Blank ND NO ND NO ND NO <br /> Surrogate Recovery 967% 96 1% 96 1% 96 1% 96 1% 96 1% <br /> T ntl LCS u-duurd[oIy CnecK Sample) IS a control sample of known, lnterterent tree matrix that IS tortified 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 /> reject batch results <br /> E ANALYST u APPROVED(BY'�,- <br /> Clart <br /> J Gonemes C Phillips <br /> Environmental Lab Director <br /> I <br />