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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 Certificate#2480 Fax (209)384-1507 Advanced GeoEnvironmental Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M 8020 of Northern California Reference Number 5269 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 11-27-02 Stockton, CA 95215 Analyst Jim Phillips Analyzed 11-27-02 Attn Tim Cuellar Reported 12-06-02 IQUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ISpike Concentration 110 2 10 1 32 7 94 1 84 922 Units ug/L ug/L ug/L uglL ug/L ug/L LCS Batch# VW-N272 VW-N272 VW-N272 VW-N272 VW-N272 VW-N272 893% 101% 967% 114% 124% 119% Surrogate Recovery 111% 116% 116% 116% 116% 116% Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch# VW-N272 VW-N27 1 VW-N272 VW-N272 VW-N272 VW-N272 Spike Concentration 110 210 1 32 794 1 84 922 I MS %Recovery 768% 930% NA* 104% 996% 839% Surrogate Recovery 119% 101% 101% 101% 101% 101% MSD% Recovery 6511% 11711% NA* 103% 975% 723% Surrogate Recovery 187% 874% 874% 874% 874% 874% Relative% Difference 379% 582% NA* 0905% 0737% 335% Methanol Blank ND ND NO ND ND ND Surrogate Recovery 115% 117% 117% 117% 117% 117% Nat calculated due to matnx interference 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 hatch 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 !I r ANALYST Al MZ APPROVED BY Clan J Cone James hillfps Lab o tory Director