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CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services P.O. Box 1360, Winton, CA 95388 Phone: 1209) 384-2930 <br /> Fax. (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: 95-0197 Method: EPA 503018015M,8020 <br /> of Northern California Reference Number: 658 Instrument 1D: Var-GC1 <br /> 1803 West March Lane, Suite A Matrix: Soil Prepared: 1.29-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 1.29-96 <br /> ' Attn:Tire Cuellar Reported: 2-1-96 <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 60.0 <br /> ' Units: mg/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch #: VG-1296 VB-1296 V8-1296 VB-1296 VB-1296 <br /> LCS % Recovery: 99.0% 91.5% 93.5% 89.0% 90.3% <br /> Surrogate Recovery: 110% 108°x6 108% 108% 108% <br /> MControl Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch #: VG-1296 VB-1296 VB-1296 VB-1296 VB-1296 <br /> ' MS % Recovery: 74.0% 90.5% 89.0% 91.3% 92.7% <br /> Surrogate Recovery: 94.9% 116% 115% 115% 115% <br /> ' MSD % Recovery: 72.8% 94.5% 94.5% 95.0% 96.7% <br /> Surrogate Recovery: 91.3% 118% 118% 118% 118% <br /> Relative % Difference: 1.60% 4.28% 5.79% 3.99% 4.16% <br /> ' Methanol Blank : ND ND ND ND ND <br /> Surrogate Recovery: 98.3% 97.5% 97.5% 97.5% 97.5% <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 /> J ' 7 <br /> ANALYST: u APPROVED BY: J� <br /> C ri J. ConeAmes C. Phillips <br /> . Environmental Lab Director <br />