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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 404 11 Wiget Lane Walnut Creels, CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> ,!D— Analytical 819 Striker Avenue,Suite a Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> 40 <br /> Sherwood Labs Corporation Client Pro'ect 7b A8C Pum <br /> P J p <br /> 8071 N Lander Ave Matrix Water <br /> Hilmar, CA 95324 <br /> Attention Tim McDonald OC Sample Group 7090397-99 Reported Sep 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE <br /> MTBE <br /> Method EPA 8260 <br /> Analyst M Williams <br /> Concentration <br /> Spiked 50ug/L <br /> LCS Batch# LCS091597 <br /> Date Prepared 09/15/97 <br /> Date Analyzed 09/15/97 <br /> Instrument I D # H6 <br /> LCS % <br /> Recovery 80 <br /> Control Limits 70130 <br /> MS/MSD <br /> Batch # 9708G3010 <br /> Date Prepared 09/11/97 <br /> Date Analyzed 09/11/97 <br /> Instrument I D # H6 <br /> Matrix Spike <br /> % Recovery 84 <br /> 3 1 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 84 <br /> Relative % <br /> Difference 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 ANALYTI AL preparation and analytical methods employed for the samples The LCS%recovery data is 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 net used to accept or reject batch results <br /> !da"C Sch eider <br /> Prct Manager/Sacramento Laboratory <br /> 7090397 SLC <4> <br /> ti <br />