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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wigg Lane Walnut Creek CA 94598 (510) 988 %00 FAX(5 to)988 9673 <br /> SII Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 %00 FAX(416)921 0100 <br /> 46rown &Caldwell Client Project ID Arco 5450, Stockton, CA <br /> 9616 Micron Ave , Suite 600 Matrix Soil <br /> Sacramento, CA 95827 <br /> Attention Steve Misner QC Sample Group 6071366-68, 70 Reported Aug 12, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene X enes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 6020 <br /> Analyst V Owens V Owens V Owens V Owens <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 50 mg/kg <br /> LCS Batch# LCS080596 LCS080596 LCS080596 LCS080596 <br /> Date Prepared 08/05/96 08/05/96 08/05/96 08/05/96 <br /> Date Analyzed 08/05/96 08/05/96 08/05/96 08/05/96 <br /> Instrument I D # GCHP-2 GCHP-2 GCHP 2 GCHP 2 <br /> • LCS <br /> Recovery. 100 102 102 102 <br /> Control Limits 70.130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 6081481 6081481 6081481 6081481 <br /> Date Prepared 08/05/96 08/05/96 08/05/96 08/05/96 <br /> Date Analyzed, 08/05/96 08/05/96 08/05/96 08/05/95 <br /> Instrument I D # GCHP 2 GCHP-2 GCHP 2 GCHP-2 <br /> Matrix Spike <br /> % Recovery 94 94 96 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 97 96 98 94 <br /> Relative% <br /> Difference 31 21 21 22 <br /> SEQUOIA ANALYTICAL Please Note <br /> //77 / The LCS is a control sample of known,lnterferent free matrix that Is analyzed using the same reagents, <br /> � � / ` 6 rC preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> L validation of sample batch results Due to matrix effects,the OC limits for MS/MSD s are advisory only <br /> Schneider and are not used to accept or refect batch results <br /> 1pirndacC <br /> Olet Manager/Sacraments Laboratory <br /> 6071366 SRS <6> <br /> I `-5 <br />