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i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvtronmental Inc Client Project ID Top Filling Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 5290 instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 12-10-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 12-10-02 <br /> Attn Tim Cuellar Reported 12-23-02 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spoke Concentration 110 2 10 1 32 794 1 84 922 <br /> Units ug/L ug/L uglL ug/L ug/L ug/L <br />' LCS Batch# VW-D102 VW-D102 VW-0102 VW-D102 VW-0102 VW-0102 <br /> 111% 634% 912% 124% 120% 135% <br /> Surrogate Recovery 111% 133% 133% 133% 133% 133% <br />' . Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br />' <br /> MS/MSD Batch# VW-01102 VW-D102 VW-D102 VW-D102 VW-D102 VW-D102 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS%Recovery 105% 115% 112% 103% 109% 106% <br /> Surrogate Recovery 110% 106% 106% 106% 106% 106% <br /> MSD%Recovery 917% 119% 114% 103% 112% 107% <br />' Surrogate Recovery 109% 105% 105% 105% 105% 105% <br /> Relative%Difference 132% 339% 163% 0287% 322% 0494% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 984% 104% 104% 104% 104% 104% <br /> The LCS(Laboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents preparation and analytical methods employed for the samples The LCS %recovery is used for validation <br /> 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 <br /> reject batch results <br /> f <br /> ANALYST APPROVED BY <br /> n J Gone Jam Phillips <br /> t oratory Director <br />