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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 503018015M,8020 <br /> of Northern California Reference Number 1677 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 7-24-98 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 7-24-98 <br />�} Attn Tim Cuellar Reported 7-29-98 <br /> I <br /> L-- <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 100 1 00 1 00 100 200 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VG-7248W VB-7248W VB-7248W V9-7248W VB-7248W VB-7248W <br /> LCS % Recovery 108% 149% 99 6% 110% 102% 104% <br /> Surrogate Recovery 963% 943% 943% 943% 943% 943% <br /> Control Limits 70-130 % 70-130 % 70130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-7248W VB-7248W VB-7248W VB-7248W VB-7248W VB-7248W <br /> MS % Recovery 121% 144% 987% 976% 992% 100% <br /> Surrogate Recovery 105% 980% 980% 980% 980% 980% <br /> MSD % Recovery 128% 115% 976% 96 1% 992% 992% <br /> Surrogate Recovery 105% 985% 985% 98 5% 98 5% 985% <br /> Relative % Difference 597% 222% 1 16% 1 49% 000% 0859% <br /> Methanol Blank ND ND ND ND ND NO <br /> Surrogate Recovery 962% 960% 960% 960% 960% 960% <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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> r <br /> f <br /> ANALYST / APPROVED BY <br /> Clan J Cone J es C Phillips <br /> nvrronmental Lab Director <br />