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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 Cal-Fuels Method EPA 503018015M 8020 ' of Northern California Reference Number 5354 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 01-02-03 Stockton CA 95215 Analyst Jim Phillips Analyzed 01-02-03 Attn Tim Cuellar Reported 01-06-03 ' 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 ug/L ug/L ug/L ug1L ug/L ug/L LCS Batch# VW-1023 VW-1023 VW-1023 VW-1023 VW-1023 VW-1023 997% 912% 873% 101% 116% 111% Surrogate Recovery 112% 107% 107% 107% 107% 107% Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% MSIMSD Batch# VW-1023 VW-1023 VW-1023 VW-1023 VW-1023 VW-1023 Spike Concentration 110 210 1 32 794 1 84 922 ' MS% Recovery 92 1% NA` 844% 101% 109% 102% Surrogate Recovery 117% 113% 113% 113% 113% 113% MSD%Recovery 867% 912% 883% 104% 112% 105% Surrogate Recovery 118% 113% 113% 113% 113% 113% Relative%Difference 538% NA' 436% 288% 249% 243% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 998% 997% 997% 997% 997% 997% 'Not reported due to MTBE contamination in autosam ler spargp tube 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 �s ANALYST APPROVED BY Clan J Cone Jfillips aboratory Director