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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 <br /> Certificate 112079 Fax: (209) 384-1507 <br /> BSK Analytical Laboratories Client Project ID: 1999120721 Method: EPA 5030/8015M,8020 <br /> 1414 Stanislaus Street Client Project Name: Valley Wholesale Instrument ID; Var-GC1 <br /> Fresno, CA 93706 Reference Number: 2704 Prepared: 12-31-99 <br /> Attn: Client Services Matrix: Water Analyzed: 12-31-99 <br /> Analyst: Jim Phillips Reported: 1-4-00 <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 9.48 <br /> Units: ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch #: VW-D319 VW-D319 VW-D319 VW-D319 VW-D319 VW-D319 <br /> LCS % Recovery; 103% 79.0% 63.9% 92.2% 110% 99.2% <br /> Surrogate Recovery: 106% 101% 101% 101% 101% 101% <br /> • Control Limits: 70-130 % 70.130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch A': VW-D319 VW-D319 VW-0319 VW-D319 VW-D319 VW-D319 <br /> Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 <br /> MS % Recovery: 120% 88.3% 63.9% 91.2% 105% 9 5.1% <br /> Surrogate Recovery: 109% 97.3% 97.3% 97.3% 97.3% 97.3% <br /> MSD % Recovery: 175% 59.6% 68.9% 94.4% 105% 96.4% <br /> Surrogate Recovery: 104% 100% 100% 100% 100% 100% <br /> Relative % Difference: 36.8% 38.2% 7.23% 3.38% 0.471% 1.32% <br /> Methanol Blank ; ND ND ND ND ND ND <br /> Surrogate Recovery: 102% ' 8.2% 98.2% 98.2% 98.2% 98.2% <br /> The LCS {Laborato(y 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 /> ANALYST: APPROVED BY: <br /> Clari J. Cone J89,6 Phili <br /> . ps <br /> vironmental Lab Director <br />