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E - <br /> Sequoia <br /> ° 680 Chesapeake Drive Redwood City,CA'94063 (415) 364-9600 FAX(415) 364-9233 <br /> Analytical 1900 Bates Avenue;Suite L Concord,CA 94520 (510) "686-9600 FAX(510)686-9689 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA. 95834 (916) '921-9600, FAX(916)921.0100 <br /> MPDS Services Client Project ID: Unocal #0788, 8203 East 1-1th S#, Tracy <br /> 2401 Stanwell Dr., Ste. 400 Matrix. Liquid <br /> ,..'Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group: 4050628-37 Reported: May 27, 1994 <br /> { <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes,. Diesel <br /> Benzene, . <br /> IEPA <br /> Method: - EPA 8020 EPA'8020 EPA 8020 EPA 8020 8015 Mod <br /> Analyst: J.Fontecha J.Foritecha J.Fontecha J.Fontecha K.Wimer . <br /> MS/MSD <br /> ,Batch#: BLK052694 .BLK052694 BLK052694 BLK052694 BLK051994 <br /> Date Prepared: 5/26/94 5/26/94 5/26/94-` 5/26/94 5/19/94 <br />{ Date Analyzed: 5/26/94 5/26/94 5/26/94 5/26/94 5/26/94- <br /> Instrument <br /> /26/94Instrument I.D.#: ML#2 ML-,#2 ML#2 ML#2 ' HP-313 <br /> Cone. Spiked: 20pg/L 20Ng/L 20Ng/L 60Ng/L.. 300µg/La <br /> Matrix Spike Y <br /> %Recovery: •.120 . 125 125 : 123 88 .. <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 100 :100. 95 98' 94 <br /> Relative <br /> Difference: 18 22. 24 23 6.2 <br /> i .................................... <br /> zf'.': <br /> ::; :::: <br /> ................. <br /> LCS Batch#: LCS052694 LCS052694. CCS052694 4CS052694 13LK051994. <br /> Date Prepared: 5/26/94 5/26/94 5/26/94 5/26/94 5/19/94 <br /> Date Analyzed: 5/26/94 5/26/94 5/26/94 5/26/94 5/26/94 <br /> Instrument 1,D.#: MIL#2 ML#2 ML#2 ML#2 HP 36 <br /> LCS% <br /> Recovery: 95 95 95 .102 88 = <br /> % Recovery <br /> - <br /> Control Limits: 71-133 72-128 72-130 71-120 i 28-122. a <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 LCS recovery is to be used to validate the batch. <br /> e p <br /> Project nager <br /> 4050628.MPD <5> <br /> I <br />