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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 Rainwater Car Wash Method EPA 5030/8015M 8020 ' of Northern California Reference Number 7092(21-24) 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 i ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration 110 210 1 32 7 94 1 84 921 Units ug/L ug/L ug/L ug/L ug/L ug/L 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 110 210 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% 2 05% 11 6% 7 51% 135% ' Method Blank ND ND ND ND ND ND Surrogate Recovery 102% 973% 973% 973% 973% 973% 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 i ' APPROVED BY010q� APPROVED BY Clan G e JamesA Phillips Laboratory Manag r Lab atory Director