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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (650) 364 9600 FAX(650)364 9233 <br /> 404 N Wrget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 9673 <br /> Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Pacific Environmental Group Client Project ID 920-119 119/Chevron 9-6171, Stockton, CA <br /> 11315 Sunrise Gold Circle, Ste M Matrix Soil <br /> Rancho Cordova, CA 95742 <br /> Attention Tim Anenson QC Sample Group 80 10315-0335, 0337-0345 Reported Jan 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene Benzene Xylenes <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst C Lee C Lee C Lee C Lee <br /> Concentration <br /> Spiked 0 20 mg/kg 0 20 mg/kg 0 20 mg/kg 0 60 mg/kg <br /> LCS Batch# LCS011398 LCS011398 LCS011398 LCS011398 <br /> Date Prepared 01/13/98 01/13/98 01/13/98 01/13/98 <br /> Date Analyzed 01/13/98 01/13/98 01/13/98 01/13/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP 1 <br /> LCS % <br /> Recovery- 95 93 96 96 <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> MS/MSD <br /> Batch # 8010315 8010315 8010315 8010315 <br /> Date Prepared 01/13/98 01/13/98 01/13/98 01/13/98 <br /> Date Analyzed 01/13/98 01/13/98 01/13/98 01/13/98 <br /> Instrument I D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Matrix Spike <br /> % Recovery 87 85 92 91 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 86 86 91 91 <br /> Relative % <br /> Difference 1 2 1 2 1 1 00 <br />&EQUOIA ANAL AL Please Note <br /> The LCS is a control sample of known, interferent free matrix that is analyzed using the same reagents, <br /> 1/Y] preparation and analytical methods employed for the samples The LCS%recovery data is used for <br /> /!K CCC validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> Linda C Schneider and are not used to accept or reject batch results <br /> Project Manager/Sacramento Labors ory <br /> 8010315 PES t13> <br /> .99� <br />