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- ' Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> VftV Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> 116' <br /> roundwater Technology Client project 1D Chevron#9-1918, Stockton, CA <br /> 1401 Halyard Drive, Suite 140 Matrix Soil <br /> West Sacramento, CA 95691 <br /> Attention Jason Fedota QC Sample Group 5060371-379 Reported Jun 15, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> TOG ' <br /> EPA Method EPA 9060 Mod <br /> Date Analyzed 6/15/95 <br /> ACCURACY ASSESSMENT <br /> LCS Spike <br /> Conc Added 2,500 <br /> LCS Spike <br /> Result 2,500 <br /> LCS Spike <br /> *Upper <br /> % Recovery 100 <br /> Control <br /> Limit 112 <br /> Lower Control <br /> Limit 89 <br /> PRECISION ASSESSMENT <br /> Sample# B506254-01 <br /> Original 260 <br /> Duplicate 310 <br /> Relative% <br /> Difference 18 <br /> Maximum <br /> RPD 34 <br /> SEQUOIA ANALYTICAL Lab Control Sample Conc of L C S x 100 <br /> %Recovery L C S Spike Conc Added <br /> i — Relative%Difference Original Result-Duplicate Result X100 <br /> Lind C Schneider �� (Original Resutt + Duplicate Result) / 2 <br /> Project Manager <br /> 5060371 G RW c 6> <br />