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I <br /> 14WASTLE 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 GeoEnviron mental, Inc Client Protect ID Tap Filling Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 5521 instrument ID Var-GC1 <br /> 837 Shaw Road Sample Descnption Water Extracted 03-05-03 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 03-05-03 <br /> Attn Tim Cuellar Reported 03-18-03 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 110 210 1 32 794 1 84 922 <br /> Units uglL ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch# VW-3053 VW-3053 VW-3053 VW-3053 VW-3053 VW-3053 <br /> 972% 832% 874% 884% 100% 957% <br /> Surrogate Recovery 116% 111% 111% 111% 111% 111% <br /> lie ontrol Limits 70-130% 70-130 % 70-130% 70-130% 70-130% 70-130% <br />' MS/MSD Batch# VW-3053 VW-3053 VW-3053 VW-3053 VW-3053 VW-3053 <br /> Spike Concentration 110 210 1 32 794 1 84 922 <br />' MS%Recovery 944% 114% 820% 875% 104% 102% <br /> Surrogate Recovery 119% 114% 114% 114% 114% 114% <br /> MSD%Recovery 914% 1060/o 840% 869% 103% 100% <br />' Surrogate Recovery 120% 116% 116% 116% 116% 116% <br /> Relative% Difference 307% 727% 1 86% 0569% 108% 152% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 103% 103% 103% 103% 103% <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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> j <br /> r <br /> ANALYSTpaff-01-.'�PPROVED BY G/ <br /> Clan o Jam ips <br /> L oratory Director <br />