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' CAST <br /> • LE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: 1209) 384-2930 <br /> Certificate #2079 Fax: 1209) 384-1507 <br />' BSK Analytical Laboratories Client Project ID: 1999120722 Method: EPA 5030/8015M,8020 <br /> 1414 Stanislaus Street Client Project Name: Valley Showcase Instrument ID: Var-GC1 <br /> Fresno, CA 93706 Reference Number: 2703 Prepared: 12-31-99 <br /> Attn: Client Services Matrix: Water Analyzed: 12-31-99 <br />' Analyst: Jim Phillips Reported: 1-4-00 <br />' aUALITY 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: uglL uglL uglL uglL ug/L ug1L <br /> LCS Batch #: VW-D319 VW-D319 VW-D319 VW-D319 VW-D319 VW-0319 <br /> 1 <br /> LCS % Recovery: 103% 79.0% 63.9% 92.2% 110% 99.2% <br />' Surrogate Recovery: 108% 101% 101% 101% 101% 101% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MSIMSD Batch #: VW-D319 VW-D319 VW-D319 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% 95.1% <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 /> 1 <br /> Methanol Blank : ND ND ND ND ND ND <br /> Surrogate Recovery: 102% 98.2% 98.2% 98.2% 98.2% 98.2% <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 /> 1 ' <br /> i - <br /> ANALYST: 116&4 APPROVED BY: <br /> Clari J. Cone James,C. Phillips <br /> Env onmental Lab Director <br />