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Sequoia * 680 Chesapeake Drive Redwood City, CA 9363 (415) 364 9600 FAX(415) 364 9233 <br /> 1i �1 (D 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(5 10)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> pgradient Client Project 1D Apache <br /> 369 Kimberly Rd Matrix Water <br /> Cameron Park, CA 95682 <br /> Attention Clyde Hebbrom GC Sample Goup 503-0257 Reported Mar 21, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloroethene Trichloroethene Chloro <br /> benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst D Nelson D Nelson D Nelson <br /> Concentration <br /> Spiked 25 ug/L 25 ug/L 25 ug/L <br /> LCS Batch# LCS030795 LCS030795 LCS030795 <br /> Date Prepared 3/8/95 3/8/95 3/8/95 <br /> Date Analyzed 3/8/95 3/8/95 3/8/95 <br /> Instrument I D # GCHP-08 GCHP-08 GCHP-08 <br /> LCS % <br /> Recovery 104 104 100 <br /> Control Limits 28-167 35-146 38-150 <br /> MS/MSD <br /> Batch # 9503210-09 9503210-09 9503210-09 <br /> Date Prepared 3/8/95 3/8/95 3/8/95 <br /> Date Analyzed 3/8/95 3/8/95 3/8/95 <br /> Instrument l D # GCHP-08 GCHP-08 GCHP-08 <br /> Matrix Spike <br /> % Recovery 112 112 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 112 112 112 <br /> Relative% <br /> Difference 00 00 00 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples The LCS%recovery data 1s used for <br /> validation of sample batch results Due to matrix effects,the QC limits for MS/MSD s are advisory only <br /> and are not used to accept or reject batch results <br /> Jen ie Higgins - <br /> Project Manager <br /> 5030257 UPG <2> <br />