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I Ile CASTLE ANALYTICAL LABORATORY I Environmental Testing Services 2333 Shuttle Dnve,Atwater, CA 95301 Phone (209)384-2930 Certificate#2480 Fax (209)384-1507 Advanced GeoEnvironmental Inc Client Project ID Pacific Pride-West Lane Method EPA 503018015M 8020 I of Northern California Reference Number 6211 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 10-20-03 Stockton CA 95215 Analyst Jim Phillips Analyzed 10-20-03 Attn Tim Cuellar Reported 10-30-03 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 110 2 10 1 32 7 94 1 84 922 Units ug/L ug/L ug/L ug/L ug/L uglL LCS Batch# VW-0203 VW-0203 VW-0203 VW-0203 VW-0203 VW-0203 LCS % Recovery 102% 124% 106% 991% 100% 994% Surrogate Recovery 100% 979% 979% 979% 979% 979% Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% IMSIMSD Batch# VW-0203 VW-0203 VW-0203 VW-0203 VW-0203 VW-0203 Spike Concentration 110 2 10 1 32 794 1 84 9 22 I MS% Recovery 905% 989% 960% 942% 101% 997% Surrogate Recovery 101% 100% 100% 100% 100% 100% MSD%Recovery 890% 105% 979% 935% 101% 992% Surrogate Recovery 100% 99 1% 99 1% 991% 991% 99 1% Relative% Difference 1 71% 548% 195% 0732% 000535% 0457% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 951% 96 1% 961% 961% 961% 96 1% I 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 ANALYST APPROVED BYC� I Clan J Cone JaM96 C Phrl6ps L oratory Director I