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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:.Marquardt Tr. Method: EPA 5030/8015M,8020 <br /> of Northern California Reference Number: 923 Instrument ID: Var-GC1 <br /> 1803 West March Lane, Suite A Matrix: Water Prepared: <br /> 11-2-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 11-2-96 <br /> Attn: Tim Cuellar Reported: <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration:' 100 1.00 1.G0 1.00 1.00 2.00 <br /> Units: ug/L ug/L ug/L ug/L- ug/L ug/L <br /> LCS Batch #: VG-N026W VB-N026W -VB-N026W . VB-N026W. VB-N026W - VB-N026W <br /> LCS % Recovery: 104% 128% 109% 120% ..112% 117% <br /> Surrogate Recovery: 106% 102% 102% - 102% 102% 102% <br /> Control Limits: 70-130 % 70-1-30 % 70-130 % '70-130 % 70-130 % 70-130, <br /> MS/MSD Batch.#r VG-N026W VB-N026W `VB-N026W V8-N026W VB-N026W VB-N026W <br /> MS % Recovery: 94.1% 34.6% 86.3% 87.4% 97.5% 95.2% <br /> Surrogate Recovery: 107% 101% 101% 101% 101% 101% <br /> MSD % Recovery: 94.0% 46.5% 85.9% 87.2% 101% 95.7% <br /> Surrogate Recovery: 107% 102% 102% 102% 102% 102% <br /> Relative % Difference: 0.00744% 12.2% 0.149% 0.174% 1.77% 0.439% <br /> Methanol Blank : ND ND ND -ND ND ND <br /> Surrogate Recovery: 105% 104% 104% 104% 104% 104% <br /> Please Note: <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 /> ANALYST:` C%�/�i APPROVED BY: ✓" <br /> Clari J. Cone Jofiles C. Phillips <br /> Environmental Lab Director <br /> ii . <br />