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3-11-1997 3:23PM FROM AGE INC 209 956 0700 P. 3 <br /> f <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P.0 Box 1360,Winton, CA 95386 Phone: (2091364-2930 <br /> Fax: (209) 384-1597 <br /> Advanced GeoEnvironmental, Inc. Client Project ID:Muller&Vail Method: EPA 503016015M,8020 <br /> of Northern California Reference Numbor: 943 Inmtrument ID:Var-GCI <br /> 1803 West March Lane,Suite A Matrix:Soil Prepared: 11-21.96 <br /> Stockton,CA 95207 Analyst: Jim Phillips Analyzed: 11-21-96 <br /> Attn:Tim Cuellar Reported: 11-26-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration: 2.00 20.0 20.0 20.0 40.0 <br /> Units: mglkg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch VG-N216 VS-N216 VS-N216 VB-N216 Vs-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 /> MS/M50 Batch 0: VG-N216 V8-N216 V8-N216 VB-N216 VB-N216 <br /> MS% Recovery: 89.3% 112% 104% 108% 105% <br /> Surrogate Recovery: 86-6% 89.0% 89.0% 89.0% 69.0%, <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 /> Relative% Difference: 0.398% 7.94% 8.64% 8.26% 9.24% <br /> Methanol Blank: ND ND ND NO 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 anaiytas 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 off ets. the QC limits and recoveries for MS/MSD's bre advisory only and are net used to accept or <br /> reject batch results. <br /> ANALYST: APPROVED BY: <br /> Clare J. Con9 ares C.Phillipa <br /> Environrrnnta!lab Director <br />