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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384 2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> [[Atin <br /> dvanced GeoEnvironmental, Inc Client Project ID Comfort Air Method EPA 5030l8015M,8020 <br /> Northern California Reference Number 866 instrument ID Var-GC1 <br /> 03 West March Lane, Suite A Matrix Water Prepared 9-10-96 <br /> ockton, CA 95207 Analyst Jim Phillips Analyzed 9-10-96 <br /> Tim Cuellar Reported 9-1296 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 1 00 1 00 1 00 2 00 <br /> Units uglL uglL uglL uglL ugIL ug/L <br /> LCS Batch # VG-9106W VB-9106W VB-9106W VB 9106W VB-9106W VB-9106W <br /> LCS % Recovery 102% 113% 109% 113% ill% 120% <br /> Surrogate Recovery 101% 101% 101% 101% 101% 101% <br /> 0 Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG 9106W VB-9106W VB 9106W VB-9106W VB-9106W V8-9106W <br /> MS % Recovery 964% 972% 104% 107% 106% 112% <br /> Surrogate Recovery 100% 88 9% 88 9% 889% 889% 88 9% <br /> MSD % Recovery 96 7% 110% 104% 106% 106% 108% <br /> Surrogate Recovery 101% 995% 99 5% 99 5% 99 5% 99 5% <br /> Relative % Difference 0330% 12 5% 00193% 123% 0 189% 347% <br /> Methanol Blank ND NO ND ND NO ND <br /> Surrogate Recovery 85 3% 85 8% 85 8% 858% 85 B% 85 8% <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 MSlMSD's are advisory only and are not used to accept or <br /> refect batch results <br />. ANALYST G!/�,t •fJ/•� APPROVED BY <br /> C/a J Co J�►fes Phillips <br /> lEnwronmental Lab Director <br />