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4D Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue Suite 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 940-8829 -01-4 Reported Aug 29, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE TOG Diesel <br /> Method SM 5520 EF EPA 8015 Mod <br /> Analyst A Pina A.Nag ra. <br /> MS/MSD <br /> Batch# 940895301 940859601 <br /> Date Prepared 8/17/94 8/11/94 <br /> Date Analyzed 8/17/94 8/11/94 <br /> Instrument I.D # NA GCHP5A <br /> Cone Spiked 1000 mg/Kg 15 mg/Kg <br /> Matrix Spike <br /> % Recovery 46* 87 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 110* 88 <br /> Relative % <br /> Difference 82* 11 <br /> *MS/MSD affected by analytes in sample Batch accepted based on LCS results <br /> LCS Batch# BLK081794 <br /> Date Prepared 8/17/94 <br /> Date Analyzed 8/17/94 <br /> Instrument I.D # N A. <br /> LCS % <br /> Recovery 85 - <br /> ecovery <br /> Control Limits 70-110 38-122 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents <br /> 0SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> J (VA <br /> � interference,the LCS recovery is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 9408829 TTT <1 a <br />