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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 /> Advanced GeoEnvironmental, Inc. Client Project ID: Flag City Chevron Method: EPA 5030/8015M,8020 <br />' of Northern California Reference Number: 817 Instrument 1D: Var-GC1 <br /> 1803 West March Lane, Suite A Matrix: Water Prepared: 7-26-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 7-26-96 <br /> Attn: Tim Cuellar Reported: 7-31-96 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration: 100 1.00 1.00 1.00 2.00 <br /> Units: ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch #: VG-7266W VB-7266W VB-7266W VB-7266W VB-7266W <br /> LCS % Recovery: 99.3% 95.2% 108% 109% 112% <br /> Surrogate Recovery: 102% 96.0% 96.0% 96.0% 96.0% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #: VG-7266W VB-7266W VB-7266W VB-7266W VB-7266W <br /> MS % Recovery: 99.7% NA' NA NA NA <br /> Surrogate Recovery: 99.1% NA NA NA NA <br /> MSD % Recovery: 146% 89.2% 102% 107% 1090/0 <br /> Surrogate Recovery: 100% 100% 100% 100% 100% <br /> IRelative % Difference: 37.6% NA NA NA NA <br /> Methanol Blank : ND ND NO ND ND <br /> Surrogate Recovery: 102% 103% 103% 103% 103% <br /> Wore: VB-MS-7266 not injected due ro scheduling error <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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> 7 \ <br /> ANALYST: APPROVED 8Y: <br /> C/ari J. Cone J es . Phillips <br /> En vironmen rat Lab Director <br />