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i i . CASTLE ANALYTICAL LABORATORY i 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 Pride West Lane Method EPA 5030/8015M 8020 of Northern California Reference Number 6565 Instrument ID Var-GC1 837 Shaw Road Sample Description Water Extracted 01-27-04 Stockton CA 95215 Analyst Jim Phillips Analyzed 01-27-04 ' Attn Tim Cuellar Reported 02-06-04 ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration 110 210 1 32 794 1 84 922 Units uglL ug/L ug/L ug/L uglL ug/L ' LCS Batch# VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 837% 114% 106% 977% 108% 107% Surrogate Recovery 889% 109% 109% 109% 109% 109% Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch# VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 VW-1274 Spike Concentration 110 210 1 32 7 94 1 84 922 ' MS % Recovery 897% 938% 955% 937% 978% 994% Surrogate Recovery 102% 998% 998% 998% 998% 998% MSD% Recovery 852% 935% 955% 936% 102% 100% ' Surrogate Recovery 103% 100% 100% 100% 100% 100% Relative% Difference 516% 0315% 00316% 00993% 435% 0662% ' Method Blank NO NO NO ND ND ND Surrogate Recovery 103% 105% 105% 105% 105% 105% 1 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 MSIMSD's are advisory only and are not used to accept or reject batch results ANALYST ! APPROVED BY Glary J ne /C4'/1'P s La story Director