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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (2091 384-2930 <br />' Certificate 42079 Fax: (209) 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 10: Var-GC1 <br /> Fresno, CA 93706 Reference Number: 2703 Prepared: 1-4-00 <br /> Attn: Client Services Matrix: Water Analyzed: 1-4-00 <br />' Analyst: Jim Phillips Reported: 1-5-00 <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 uglL ug1L ug/L ug1L uglL <br />' LCS Batch ry: VW-1040 VW-1040 VW-1040 VW-1040 VW-1040 VW-1040 <br /> LCS % Recovery: 85.3% 113% 78.0% 79.3% 86.5% 78.0% <br />' Surrogate Recovery: 106% 96.3% 96.3% 96.3% 96.3% 96.3% <br /> iControl Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br />' MS/MSD Batch rt: VW-1040 VW-1040 VW-1040 VW-1040 VW-1040 VW-1040 <br /> Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 <br />' MS % Recovery: 61.6% 95.4% 64.4% 66.5% 71.3% 64.5% <br /> Surrogate Recovery: 102% 96.0% 96.0% 96.0% 96.0% 96.0% <br />' MSD % Recovery: 77.2% 112% 77.2% 79.3% 86.3% 77.8% <br /> Surrogate Recovery: 99.8% 95.4% 95.4% 95.4% 95.4% 95.4% <br /> Relative % Difference: 21,1% 16.2% 17.5% 17.6% 18.6% 18.5% <br /> Methanol Blank : ND ND ND ND ND ND <br /> Surrogate Recovery: 94.3% 88.9% 88.9% 88.9% 88.9% 88.9% <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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results. <br />' ANALYST: APPROVED BY- L, <br /> Clan Cone J9&es C. P illips <br /> t .environmental Lab Director <br />