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' CASTLE ANALYTICAL • LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: {209) 384-2930 ' Certificate #2079 Fax: 1209) 384-1507 BSK Analytical Laboratories Client Project ID: 1999120722 Method: EPA 503018015M,8020 ' 1414 Stanislaus Street Client Project Name: Valley Showcase Instrument ID: Var-GC1 Fresno, CA 93706 Reference Number: 2703 Prepared: 12-29-99 Attn: Client Services Matrix: Water Analyzed: 12-29-99 ' Analyst: Jim Phillips Reported: 1-4-00 ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration: 110 2.22 1.34 7,82 1.84 9.48 Units: uglL ug1L uglL uglL uglL uglL ' LCS Batch #: VW-D299 VW-D299 VW-10299 VW-0299 VW-D299 VW-D299 LCS % Recovery: 90.6% 89.8% 6B.6% 94.4% 110% 98.5% Surrogate Recovery: 113% 110% 110% 110% 110% 110% ' • Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % ' MS/MSO Batch tx: VW-D299 VW-0299 VW-D299 VW-D299 VW-0299 VW-D299 Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 ' MS % Recovery: 86.0% 88.6% 67.4% 92.6% 105% 95.4% Surrogate Recovery: 107% 101% 101% 101% 101% 101% ' MSD % Recovery: 83.2% 86.1% 66.8% 95.3% 108% 99.1% Surrogate Recovery: 106% 101% 101% 101% 101% 101% Relative % Difference: 2.75% 2.48% 0.886% 2.84% 2.62% 3.68% ' Methanol Blank : NO ND ND ND ND ND Surrogate Recovery: 100% 96.6% 96.6% 96.6% 96.6% 96.6% The LCS ;Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and ' analyzed using the same reagents, preparation and analytical methods employed for the samples. The LCS % recovery is used for validation 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 reject batch results. 1 • \. ANALYST; APPROVED BY: CP.rro J. Cone es C. Phillips ' nvironmental Lab Director