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i 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 Rainwater Car Wash Method EPA 5030/8015M 8020 ' of Northern California Reference Number 7093 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 06-28-04 Stockton CA 95215 Analyst Jim Phillips Analyzed 06-28-04 Attn Tim Cuellar Reported 07-07-04 1 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration 110 2 10 1 32 794 1 84 122 Units ug/L ug1L uglL ug/L uglL uglL LCS Batch# VW-6284 VW-6284 VW-6284 VW-6284 VW--6284 VW-6284 ' LCS %Recovery 102% 113% 111% 102% 111% 106% Surrogate Recovery 110% 101% 101% 101% 101% 101% Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MS/MSD Batch# VW-6284 VW-6284 VW-6284 VW-6284 VW-6284 VW-6284 Spike Concentration 110 2 10 1 32 7 94 1 84 922 MS %Recovery 957% 526% 779% 115% 112% 123% Surrogate Recovery 102% 126% 126% 126% 126% 126% MSD% Recovery 937% 755% 795% 102% 104% 107% ' Surrogate Recovery 104% 105% 105% 105% 105% 105% Relative%Difference 2 12% 356% 205% 11 6% 7 51% 135% ' Method Blank ND ND ND ND ND ND Surrogate Recovery 102% 973% 973% 973% 973% 973% I 1 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 (9/APPROVED BY APPROVED BY Clary J Cone Ja s hrllips Laboratory Maager L oratory Director