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' CASTLE ANALYTICAL LABORATORY •Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 Certificate #2079 Fax (209) 384-1507 Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 6030/8015M,8020 ' of Northern California Reference Number 2391 Instrument ID Var-GC1 4005 North Wilson Way Matrix Water Prepared 7-29 99 Stockton, CA 95205 Analyst Jim Phillips Analyzed 7-29-99 Attn Tim Cuellar Reported 8-9-99 ' QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration 110 2 22 1 34 7 82 1 84 948 Units ug/L ug/L ug/L ug/L ug/L ug/L ' LCS Batch # VW-7299 VW-7299 VW-7299 VW-7299 VW-7299 VW-7299 LCS % Recovery 98 2% 90 1% 85 8% 104% 117% 104% Surrogate Recovery 103% 100% 100% 100% 100% 100% ' *Control Limas 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % 70 130 % MSIMSD Batch # VW-7299 VW 7299 VW 7299 VW-7299 VW-7299 VW-7299 Spike Concentration 110 222 1 34 7 82 1 84 948 MS % Recovery 91 5% 76 9% 97 6% 967% 107% 960% Surrogate Recovery 102% 98 1% 98 1% 98 1% 98 1% 98 1% MSD % Recovery 104% 748% 98 1% 101% 113% 102% Surrogate Recovery 112% 108% 108% 108% 108% 108% Relative % Difference 11 8% 2 67% 0 503% 3 90% 493% 6 13% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 99 2% 98 9% 98 9% 989% 98 9% 98 9% The LCS (Laboratory Check Sample) is a control sample of known interferer free P t 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 ANALYST APPROVED BY Clan J Cone J es Z Phrlhps Environmental Lab Director I