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1 ' <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone {209} 384-2930 <br /> Certificate #2079 Fax 1209) 384 1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 1078 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 4-16-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 4-16-97 <br /> Attn Tim Cuellar Reported 4-21-97 <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 ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VG-4167W VB-4167W VB 4167W VB-4167W VS-4167W VB-4167W <br /> LCS % Recovery 998% 972% 940% 101% 102% 101% <br /> Surrogate Recovery 102% 99 1% 99 1% 99 1% 99 1% 99 1% <br /> Control Limits 70-130 % 70-130 % 70 130 % 70-130 % 70-130 % 70 130 % <br /> MS/MSD Batch # VG 4167W VB 4167W VB 4167W VS-4167W VB 4167W VB-4167W <br /> MS % Recovery 102% 981% 101 2% 99 9% 108% 110% <br /> Surrogate Recovery 106% 102% 102% 102% 102% 102% <br /> IMSD % Recovery 103% 95 8% 964% 97 9% 105% 103% <br /> Surrogate Recovery 105% 103% 103% 103% 103% 103% <br /> IRelative % Difference 1 18% 240% 492% 1 99% 3 01% 686% <br /> I Methanol Blank NO NO ND ND NO NO <br /> Surrogate Recovery 101% 102% 102% 102% 102% 102% <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 /> I 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 /> reject batch results <br /> t <br /> n <br /> ANALYST APPROVED BY <br /> Carr J Cone Jam C Phillips <br /> En rronmental Lab Director <br /> I <br />