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. CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (2091 384-2930 Certificate 1#2079 Fax: (209) 384-1507 BSK Analytical Laboratories Client Project ID: 1999120721 Method: EPA 5030/8015M,8020 1414 Stanislaus Street Client Project Name: Valley Wholesale Instrument ID: Var-GC1 Fresno, CA 93706 Reference Number: 2704 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: ug/L ug/L ug/L ug/L ug/L ug1L LCS Batch if: VW-0299 VW-D299 VW-D299 VW-D299 VW-D299 VW-D299 LCS % Recovery: 90.6% 89.8% 68.6% 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/MSD Batch #: VW-D299 VW-D299 VW-0299 VW-D299 VW-D299 VW-D299 Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 M5 % 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% 106% 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 : ND 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 MS/MSD's are advisory only and are not used to accept or reject batch results. U/ANALYST: / APPROVED BY: Clari J. Cone J e C. Phillips Environmental Lab Director I