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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 /> O <br /> MPDS Services Client Project 1b Unocal # 2859, 1665 I'Iacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4080913-919 Reported Aug 30, 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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4080919 4080919 4080919 4080919 <br /> Date Prepared 8/23/94 8/23/94 8/23/94 8/23/94 <br /> Date Analyzed 8/23/94 8/23/94 8/23/94 8/23/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP-5 <br /> Conc Spiked 20ug/L 20pg/L 20pg/L 60.tg/L <br /> Matrix Spike <br /> % Recovery 100 105 120 118 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery 105 115 120 120 <br /> Relative% <br /> Difference 4 9 91 0 0 1 7 <br /> LCS Batch# 3LCS082394 3LCS082394 3LC8082394 3LCS082394 <br /> Date Prepared 8/23/94 8/23/94 8/23/94 8/23/94 <br /> Date Analyzed 8/23/94 8/23/94 8/23/94 8/23/94 <br /> Instrument I D # HP-5 HP-5 HP-5 HP 5 <br /> LCS% <br /> Recovery 102 112 116 114 <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 /> OSignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LGS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4080913 MPD a3> <br />