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CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services Y P.O. Box 1360, Winton, CA 95388 Phone: 1209) 384-2930 <br /> Fax: 1209) 384-1507 <br /> Advanced GeoEnvironmental, Inc. Client Project ID: 95-0197 Method: EPA 5O3C'l8O15M,8020 <br /> ' of Northern California Reference Number: 658 Instrument ID: 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:Tim Cuellar Reported: 2-1-96 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' <br /> Spike Concentration: 2.00 20.0 20.0 20.0 60.0 <br /> ' Emits: mg/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch #: VG-1296 VB-1296 VB-1296 VB-1296 VB-1296 <br /> ' LCS % Recovery: 99.0% 91.5% 93.5% 89.0% 90.3% <br /> Surrogate Recovery: 110% 108% 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°k 115% 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: 98.30/1) 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results. <br /> JOaJANALYST: � APPROVED BY: <br /> C ri J. Cone ames C. Phillips <br /> • Environmental Lab Director <br /> 1 <br />