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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333' Shuttle Drive, Atwater, CA 95301 Phone 1209) 384-2930 <br /> Certificate #2079 Fax 1209) 384-1507 <br /> L <br /> Analytical Laboratories Client Project 1D 9901/675 Method EPA 5030/8015M,8020 <br /> Stanislaus Street Reference Number 2034 Instrument ID Var-GC1 <br /> o, CA 93706 Matrix Water Prepared 2-6-99 <br /> Semple Receiving Analyst Jim Phillips Analyzed 2-6-99 <br />' Reported 2-15-99 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 2 22 1 34 7 82 1 84 948 <br /> Units uglL ug/L uglL uglL uglL ug/L <br />' LCS Batch # VW 2069 VW 2069 VW-2069 VW-2069 VW-2069 VW-2069 <br /> LCS % Recovery 110% 107% 107% 100% 107% 95 8% <br /> Surrogate Recovery 105°/0 102% 102% 102% 102% 102% <br /> IControl Limits 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % 70130 % <br />' MS/MSD Batch # VW-2069 VW-2069 VW-2069 VW-2069 VW-2069 VW-2069 <br /> MS % Recovery 128% 108% 101% 103% 112% 106% <br /> Surrogate Recovery 111% 108% 108% 106% 108% 108% <br /> MSD % Recovery 107% 130% 992% 103% 111% 98 1% <br /> Surrogate Recovery 105% 102% 102% 102% 102°/a 102% <br /> Relative % Difference 17 5% 18 8% 144% 0 587% 1 15% 764% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 95 9% 95 9% 95 9% 95 9% 95 9% 95 9% <br /> The LCS 11-aboratar Check <br /> y 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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 7 <br /> IANALYST APPROVED B5nvironmenral <br /> Clary J Cone s Phlllrps <br /> Lab Director <br /> I <br />