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I <br /> • 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 Fuel's Method EPA 503018015M 8020 <br /> of Northern California Reference Number 1326 Instrument ID Var GC1 <br /> 4005 North wilson Way Matrix Water Prepared 11-17-97 <br /> Stockton, CA 95205 Analyst Jim Phillips Analyzed 11-17-97 <br />' Attn Tim Cuellar Reported 11-20-97 <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 00 200 <br /> Units ug1L ug/L uglL ug/L ug/L ug/L. <br /> LCS Batch # VG N177W VB-N177W VB N177W VB-N177W VB-N177W VB-N177W <br /> LCS % Recovery 93 7% 101% 95 6% 96 1% 941% 942% <br /> . Surrogate Recovery 101% 100% 100% 100% 100% 100% <br /> IControl Limits 70130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch # VG-N177W VB N177W VB-N177W VB-N177W VB-N177W VB-N177W <br /> MS % Recovery 882% 107% 107% 104% 112% 111% <br /> Surrogate Recovery 105% 104% 104% 104% 104% 104% <br /> MSD % Recovery 905% 129% 127% 121% 124% 122% <br /> Surrogate Recovery 106% 108% 108% 108% 108% 108% <br /> Relative % Difference 1 27% 184% 2 57% 2 57% 598% 400% <br /> Methanol Blank ND NO ND ND ND ND <br /> Surrogate Recovery 101% 100% 100% 100% 100% 100% <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 /> reject batch results <br /> ANALYST APPROVED BY <br /> Clary J one mes 1CPh,111ps <br /> Environmental Lab Director <br />