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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 GeoEnvironmental Inc Client Project ID Top Filling Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 5923 Instrument ID Var-GC1 <br />' 837 Shaw Road Matrix Sod Extracted 07-25-03 <br /> Stockton, CA 95215 Analyst Clan Cone Analyzed 07-25-03 <br /> Attn Tim Cuellar Reported 08-18-03 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 220 42 0 264 159 368 184 <br /> Units mglkg ug/kg ug/kg ug/kg ug/kg ug/kg <br />' LCS Batch# VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 <br /> LCS %Recovery 981% 109% 111% 961% 102% 100% <br />' Surrogate Recovery 103% 101% 101% 101% 101% 101% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MSIMSD Batch# VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 VS-7253 <br /> MS% Recovery 790% 110% 845% 863% 901% 905% <br />' Surrogate Recovery 922% 936% 936% 936% 936% 936% <br /> MSD%Recovery 794% 105% 939% 852% 891% 892% <br /> Surrogate Recovery 906% 91 0% 91 0% 91 0% 91 0% 910% <br />' Relative%Difference 0468% 520% 104% 1 18% 1 14% 1 48% <br /> Methanol Blank NO ND NO NO NO ND <br /> Surrogate Recovery 939% 963% 963% 963% 963% 963% <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 /> ANALYST APPROVED BY <br /> Cla Cane <br /> 5Erronmental <br /> rps <br /> Lab Director <br /> 1 <br />