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S 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 /> BSK Analytical Laboratories Client Project ID 2003030164 Method EPA 5030/8015M,8020 <br /> 1414 Stanislaus Street Client Project Name Sun West Instrument ID Var-GC1 <br /> Fresno CA 93706 Reference Number 5540 Extracted 03-11-03 <br /> Attn Miyuki Fujita Matrix Soil Analyzed 03-12-03 <br /> Analyst Clan Cone Reported 03-20-03 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 2 20 42 0 26 4 159 36 8 184 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg uglkg <br /> LCS Batch# VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 <br /> LCS % Recovery 107% 104% 973% 843% 103% 881% <br /> Surrogate Recovery 955% 898% 898% 898% 898% 898% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 VS-3113 <br /> MS %Recovery 546% 61 7% 598% 544% 590% 554% <br /> Surrogate Recovery 665% 63 1% 631% 63 1% 631% 631% <br /> MSD% Recovery 632% 643% 572% 560% 606% 565% <br /> Surrogate Recovery 665% 627% 627% 627% 627% 627% <br /> Relative%Difference 133% 385% 442% 279% 235% 190% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 858% 838% 838% 838% 838% 838% <br /> Please Note <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 /> -T r <br /> ANALYST / APPROVED BY <br /> Clan J Cone Jame hllllps <br /> En ronmental Lab Director <br />