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I <br /> CASTLE ANALYTICAL LABORATORY <br /> Envuonmental Testing Services P 0 Box 1360, Winton, CA 95388 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 956 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 12-3-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 12-3 96 <br /> Attn Tim Cuellar Reported 12-10-96 <br /> 1 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 1 00 1 00 100 200 <br /> Units uglL ug/L uglL uglL ug/L ug1L <br />' LCS Batch # VG-D036W VB-DO36W VB-D036W VB-0036W VB D036W VB-D036W <br /> LCS % Recovery 970% 118% 107% 112% 111% 112% <br /> Surrogate Recovery 102% 995% 99 5% 99 5% 99 5% 99 5% <br /> Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70-130 °k 70-130 % <br />' MSIMSD Batch # VG-0036W VB-0036W VS-DO36W VB-D036W VB-DO36W VB-D036W <br /> MS % Recovery 166% 100% -593% 601% 92 1% 98 2% <br /> Surrogate Recovery 108% 101% 101% 101% 101% 10'% <br />' MSD % Recovery 160% 105% -179% 263% 85 2% 847% <br /> Surrogate Recovery 109% 104% 104% 104% 104% 104% <br />' Relative % Difference 1 77% 460% 348% 2 14% 0952% 1 84% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 98 3% 974% 974% 974% 974% 974% <br /> Note The MS & MSD samples were spiked on sample Lab 1D # 952 9W <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 validat,on <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 /> refect batch results <br />' ANALYST APPROVED BY � <br /> rr J Cone <br /> �Jamst Phillips <br /> En rronmental Lab Director <br /> 1 <br />