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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 Pac Car Wash Method EPA 503018015M,8020 ' of Northern California Reference Number 6371 (41) Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 12-09-03 Stockton CA 95215 Analyst Jim Phillips Analyzed 12-09-03 Attn Tim Cuellar Reported 12-18-03 ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration 110 2 10 1 32 794 1 84 922 Units uglL ug/L uglL ug/L ugIL ug/L ' LCS Batch# VW-D093HP2 VW-D093HP2 VW-D093HP2 VW-0093HP2 VW-D093HP2 VW-D093HP2 LCS % Recovery 102% 130% 122% 106% 113% 108% Surrogate Recovery 123% 116% 116% 116% 115% 116% ' • Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch# VW-D093HP2 VW-D093HP2 VW-D093HP2 VW-D093HP2 VW-0093HP2 VW-D093HP2 Spike Concentration 110 2 10 1 32 794 1 84 922 ' MS %Recovery 101% 118% 116% 902% 108% 109% Surrogate Recovery 124% 119% 119% 119% 119% 119% MSD % Recovery 995% 113% 115% 102% 107% 1070/6 ' Surrogate Recovery 123% 117% 117% 117% 117% 117% Relative%Difference 1 59% 386% 0825% 0445% 0507% 1 71% ' Methanol Blank ND ND ND ND ND ND Surrogate Recovery 102% 102% 102% 102% 102% 102% 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 acceptor reject batch results ' ANALYST APPROVED BY Clary Cone James C Phillips Laboratory Director I � i