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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 /> Advanced GeoEnvironmental, Inc. Client Project ID: St. Mary's High School Method: EPA 5030/8015M,8020 <br /> of Northern California Reference Number: 896 Instrument ID: Var-GC1 <br /> 1803 West %larch Lane, Suite A Matrix: Soil Prepared: 10-2-96 <br /> Stockton, CA 95207 Analyst: Jim Phillips Analyzed: 10-2-96 <br /> Attn: Tim Cuellar deported: 10.7-96 <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: mg.'ko Lg;kg ug.'k.g jg,'kg ug:kg <br /> LCS Batch ;: VG-0026 VB-0026 VB-0026 VB-0026 VB-0026 <br /> LCS % dBcow6ly: 91.$°0 121% 1080/10 1074'0 111110 <br /> Surrogate Recovery: 122910 110% 110% 1101/0 1105'0 <br /> Central Limits; 0-1367 ?< 70-130 55 70-130 % 70-130 "6 70 130 96 <br /> MS/MSG _atcli JG COLE VP0026VS-0026 VB-00267 V15-0026 <br /> AAS % Recovery: 75.6°'b 94.9% 88 6% 83.8% 86.5% <br /> Surrogate Recave.y: 101511, 89.2% 89.2% 39.2% 89.2% <br /> MSD % Recovery: 78.795 37.70/c 89.5°u 85.7% 88.7% <br /> Surrogate Recovery: 10340 89.2% 89.2% 89.2°0 89.2', <br /> Relative 910 Difference: 2,62% 2.74°;, 0.955% 2.215- 2 25911, <br /> Methanoi Blank : ND ND ND ND ND <br /> Surrogate Recovery: 115/6 115% 115% 115% 1150/0 <br /> Please Note: <br /> The LCS tLaboratory 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 N1S/MSD's are advisory only and are not used to accept Or <br /> reject batch results. 1 <br /> ANALYST: e t ' r1 L ''/ APPROVED BY: L L <br /> Clari J. Cone J es C. prveps <br /> Environmental Lab Director <br />