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I <br /> Ile CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services P 0 Box 1360 Winton, CA 95388 Phone (209) 384-2930 <br /> Fax (209} 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID 95-0125 Method EPA 5030/8015M 8020 <br />' of Northern California Reference Number 627 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Sod Prepared 12-28-95 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 12-2829-95 <br />' Attn Tim Cuellar Reported 1-2-95 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 200 200 200 200 400 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG D285 VB-D285 VB-D285 VB-D285 VB-D285 <br />' LCS % Recovery 107% 131% 129% 123% 128% <br /> Surrogate Recovery 984% 92 2% 92 2% 92 2% 92 2% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70 130 % 70 130 % <br /> MSIMSD Batch # VG 0285 VB D285 VB D285 VB D285 VB-D285 <br /> MS % Recovery 84 1% 85 0% 105% 83 5% 845% <br /> Surrogate Recovery 91 1% 78 9% 789% 789% 78 9% <br />' MSD % Recovery 81 4% 86 5% 880% 845% 86 0% <br /> Surrogate Recovery 908% 95 7% 95 7% 95 7% 95 7% <br /> Relative % Difference 328% 1 70% 163% 1 17% 1 69% <br />' Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 106% 105% 105% 105% 105% <br /> I <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 QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> J <br /> ANALYST /(� APPROVED BY <br /> • an J Cone J es C Phillips <br /> nvrronmental Lab Director <br /> I <br />