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1 <br /> CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services P.O. Box 1360, Winton, CA 95386 Phone: (209) 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: 663 Instrument ID: Var-GC1 <br /> 1803 West March Lane, Suite A Matrix: Soil Prepared: 2-6-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 2-6-96 <br /> ' Attn: Tim Cuellar Reported: 2-7-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' <br /> Spike Concentration: 2.00 20.0 20.0 20.0 20.0 60.0 <br /> ' Units: mg/kg mglkg mglkg mglkg mg/kg mg/kg <br /> LCS Batch #: VG-2066 VS-2066 VB-2066 VB-2066 VB-2066 VB-2066 <br /> ' LCS % Recovery: 108% 66.0% 95.0% 93.5% 99.0% 102% <br /> Surrogate Recovery: 104% 101% 101% 101% 101% 101% <br /> Control Limits: 70-130 % 60.130 % 70-130 % 70.130 % 70-130 % 70-130 % <br /> MSIMSD Batch #: VG-2066 VB-2066 VII-2066 VB-2066 VII-2066 VB-2066 <br /> ' MS % Recovery: 135% 81.5% 104% 87.5% 107% 106% <br /> Surrogate Recovery: 120% 123% 123% 123% 123% 123% <br /> ' MSD % Recovery: 103% 80.5% 108% 95.5% 115% 116% <br /> Surrogate Recovery. 91.7% 131% 131% 131% 131% 131% <br /> ' Relative % Difference: 25.4% 1.23% 4.16% 7.55% 6.56% 7.20% <br /> Methanol Blank : ND NO ND ND ND ND <br /> ' Surrogate Recovery: 101% 100% 100% 100% 100% 100% <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: ' n <br /> C /V APPROVED BY: <br /> . Clari J. Cone Ja es . Phillips <br /> 116 vironmenral Lab Director <br /> 1 <br />