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Sequoia 680 Chesapeake Drive Redwood City C4 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 Smte 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br />*PD$ Services Client Project 11) Unocal #6015, 601 East Kettleman Lane, Lodi <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4031457-65 Reported Apr 14, 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# BLK040694 BLK040694 BLK040694 BLK040694 <br /> Date Prepared 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Date Analyzed 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Instrument I D # HP-4 HP 4 HP-4 HP-4 <br /> Conc Spiked 20pg/L 20 ug/L 20 ug/L 60 jug/L <br /> Matrix Spike <br /> % Recovery 95 90 90 60 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 95 95 90 60 <br /> Relative % <br /> Difference 00 54 00 00 <br /> LCS Batch# 41-C8040694 4LCSO40694 4LCSO40694 4LCSO40694 <br /> Date Prepared 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Date Analyzed 4/6/94 4/6/94 4/6/94 4/6/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 106 104 103 111 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <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, #1271 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 1-133 recovery1s to be used to validate the batch <br /> Keri <br /> Project Mana er <br /> 4031457 MPD <4> <br />