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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (4t5) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue Suae L Concord CA 94520 (510) 686 9600 FAX (510) 686 9689 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (9t6) 921 9600 FAX (916) 921 0100 <br /> Touchstone Developments 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 94081387 -01-3 Reported Sep 1, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Total Oil&Grease Diesel <br /> Method EPA 5520EF EPA 8015 <br /> Analyst A Pina A Nagra <br /> MS/MSD <br /> Batch# 940BB7601 9408C3203 <br /> Date Prepared- 8/22/94 8/23/94 <br /> Date Analyzed 8/22/94 8/23/94 <br /> Instrument I D # N/A GCHP-5 <br /> Conc Spiked. 1000 mg/kg 15 mg/kg <br /> Matrix Spike <br /> % Recovery* 110 93 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 93 <br /> Relative% <br /> Difference 00 00 <br /> LCS Batch# BLK082294 <br /> Date Prepared 8/22/94 <br /> Date Analyzed 8/22/94 <br /> Instrument I D # N/A <br /> LCS % <br /> Recovery 94 <br /> % Recovery <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 /> �EQUOIA 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 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 9408887TTT <1> <br /> t� <br />