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�.. CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.O. Box 1360,Winton, CA 95388 Phone: (209) 384-2930 <br /> Fax: (209) 384-1507 <br /> V <br /> Advanced GeoEnvironmental, Inc. Client Project ID: Muller&Vail Method: EPA 503018015M,8020 <br /> of Northern California Reference Number: 943 Instrument ID:Var-GC1 <br /> 1803 West March Lane, Suite A Matrix: Soil Prepared: 11-21-96 <br /> La Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 11-21-96 <br /> Attn: Tim Cuellar Reported: 11-26-96 <br /> La <br /> QUALITY CONTROL DATA REPORT <br /> w,. ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration: 2.00 20.0 20.0 20.0 40.0 <br /> a4.r <br /> Units: mg/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch #: VG-N216 VB-N216 VB-N216 VB-N216 VB-N216 <br /> LCS % Recovery: 117% 129% 125% 123% 123% <br /> Surrogate Recovery: 110% 106% 106% 106% 106% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch #: VG-N216 VB-N216 VB-N216 VB-N216 VB-N216 <br /> MS % Recovery: 89.3% 112% 104% 108% 105% <br /> Lo Surrogate Recovery: 86.6% 89.0% 89.0% 89.0% 89.0% <br /> MSD % Recovery: 88.9% 104% 95.4% 99.3% 95.4% <br /> Surrogate Recovery; 85.1% 83.0% 83.0% 83.0% 83.0% <br /> 4 <br /> Relative % Difference: 0.398% 7.94% 8.64% 8.26% 9.24% <br /> Methanol Blank ; ND ND ND ND ND <br /> �+ Surrogate Recovery: 102% 103% 103% 103% 103% <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 /> reject batch results. <br /> ANALYST: APPROVED BY: <br /> Clari J. Cone mes C. Phillips <br /> Environmental Lab Director <br /> i.r <br /> 1.. <br />