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1 ' CASTLE ANALYTICAL LABORATORY Envvonmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 ' Certificate#2480 Fax (209)384.1507 Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 503018015M 8020 ' of Northern California Reference Number 6853 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 04-13-04 Stockton CA 95215 Analyst Jim Phillips Analyzed 04-13-04 Attn Tim Cuellar Reported 04-20-04 ' 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 uglL uglL uglL ug/L ug1L ug/L ' LCS Batch# VW-4134 VW-4134 VW-4134 VW-4134 VW-4134 VW-4134 LCS %Recovery 974% 107% 103% 91 6% 969% 939% Surrogate Recovery 972% 946% 946% 946% 946% 946% ' Control Limits 70-130% 70-130% 70-1300/. 70-130% 70-130% 70-130% 1 MSIMSD Batch# VW-4134 VW-4134 VW-4134 VW-4134 VW-4134 VW-4134 Spike Concentration 110 210 1 32 794 1 84 922 ' MS % Recovery 938% 100% 102% 951% 100% 975% Surrogate Recovery 100% 996% 996% 996% 996% 996% MSD% Recovery 945% 989% 104% 951% 100% 956% ' Surrogate Recovery 103% 102% 102% 102% 102% 102% Relative %Difference 0 715% 1 29% 1 18% 00172% 00652% 1 97% ' Method Blank ND ND ND ND ND ND Surrogate Recovery 909% 925% 925% 925% 925% 925% 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%recoveryrs 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 ' APPROVED BY APPROVED BY Clan J Cone 5JJa shdllps Laboratory Manager oratory Director 1