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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suuc L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Touchstone Development Client Project ID 8632-2, Chevron 9-8632 <br /> P O Box 2554 Matrix Solid <br /> Santa Rosa, CA 95405 <br /> Attention Jeff Monroe QC Sample Group 9408E43 01-03 Reported Aug 29, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst E Cunanan E Cunanan E Cunanan E Cunanan <br /> MS/MSD <br /> Batch# 9408C7602 94MC7602 9408C7602 940807602 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 9/25/94 <br /> Date Analyzed. 8/25/x4 8/25/94 8/25/94 8/25/94 <br /> Instrument I.D # GCHP-1 GCHP-1 GCHP-1 GCHP-1 <br /> Conc Spiked 0 20 ppm 0 20 ppm 0 20 ppm 0 60 ppm <br /> Matrix Spike <br />• % Recovery 95 100 100 98 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 95 95 95 93 <br /> Relative % <br /> Difference 00 51 51 52 <br /> LCS Batch#. <br /> Date Prepared - - - <br /> Date Analyzed - <br /> Instrument I D # - <br /> LCS % <br /> Recovery - - - <br /> % Recovery <br /> Control Limits 55-145 47149 47-155 56-140 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that 1s analyzed using the same reagents, <br /> ,SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The main,spike Is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> �L the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9408E43 TTT <1> <br />