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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton CA 95388 Phone (209) 384-2930 <br /> 1 Certificate #2079 Fax (209) 384-1507 <br /> Krazan & Associates, Inc Client Project ID 014-95262 Method EPA 5030/8015M,8020 <br /> 215 W Dakota Avenue Reference Number 534 instrument iD Var-GC1 <br /> Clovis, CA 93612 Matrix Soil Prepared 9-25-95 <br /> Ann Bruce Myers Analyst Linda Phillips Analyzed 9-26-95 <br /> 1 Reported 9-27-95 <br />' QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> kSpike Concentration 200 200 200 200 400 <br /> Units mg/kg µg/kg pg/kg gglkg µg/kg <br /> LCS Batch # VG-9255 VB-9255 VB-9255 VB-9255 VB-9255 <br /> LCS % Recovery 107% 105% 107% 102% 105% <br /> Surrogate Recovery 114% 114% 114% 114% 114% <br /> 3 <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-9255 VB-9255 VB-9255 VB-9255 VB-9255 <br /> ' MS % Recovery 799% 850% 860% 840% 865% <br /> Surrogate Recovery 83 1% 822% 822% 822% 822% <br /> MSD % Recovery 694% 835% 850% 81 5% 838% <br /> Surrogate Recovery 78 1% 81 3% 81 3% 81 3% 81 3% <br /> Relative % Difference 140% 173% 1 14% 300% 3 17% <br /> Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 105% 106% 106% 106% 106% <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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST ,`4�4zv,,o" APPROVED BY11 <br /> L-tln—da P llrps J es C Phillips or <br /> Environmental Lab Director <br />