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t Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 444 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 01 DO <br /> 4broundwater Technology Client Project ID 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 5060445-47 Deported Jun 15, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TOC <br /> EPA Method EPA 9060 Mod <br /> Date Anr'yzed 6/14/95 <br /> ACCURACY ASSESSMENT <br /> LCS Spike <br /> Conc Added 2,500 <br /> LCS Spike <br /> Result 2,400 <br /> LCS Spike <br /> i <br /> % Recovery 96 <br /> Aper Control <br /> Limit 112 <br /> Lower Control <br /> Limit 89 <br /> PRECISION ASSESSMENT <br /> Sample# B506236 01 <br /> Original 4,100 <br /> Duplicate 4,200 <br /> Relative % <br /> Difference 24 <br /> Maximum <br /> RPD 34 <br /> SEQUOIA ANALYTICAL Lab Control Sample Conc of L C S x 100 <br /> AW <br /> I ) !} %Recovery L C 5 Spike Conc Added <br /> ��{ j,,1 j ~ Relative %Difference Original Result Duplicate Result x 100 <br /> Lmda Schneider s (Ongina3 Result + Duplicate Result) / 2 <br /> Project Manager v <br /> 5060445 GRW <4> <br />