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o <br />' 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 /> APDS Services icllerlt Protect ID Unocal #0788, 8203 E 11th St., Tracy <br /> 2401 Stanwell Dr., Ste.400 Matrix: Liquid <br /> Concord,.CA 94520. . <br /> Attention Avo Avedessian QC Sample Group: 4080560-69 Reported Aug 23, 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.Fonteoha J.Fontecha J. Fontecha J.Fontech.a <br /> MS/MSD <br /> Batch#: 4080530 4080530 .4080530 4080530 <br /> Date Prepared: 8/17/94 8/17/94 8/17/94 8/17/94 <br /> Date Analyzed: 8/17/94 8/17/94 8/17/94 8/17/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Cone.Spiked: 20µg/L 20,ug/L 20µg/L 60Ng/L <br /> Matrix Spike . , <br /> Recovery: 103 106 110 11.2 <br /> 'Matrix Spike. - <br /> Duplicate% <br /> Recovery: 1os 105 110 112 <br /> Relative% <br /> Difference: 1.9 .0.95 0.0 0.0 <br /> ...... <br /> :::::::.:::::::::::.::....::.:......:::: : :::::. <br /> :::::::::.:::::::::::::::::::::::.::::.:::::::::::::::::.::::::::::::: ,:.... .::.:::::.. <br /> nf::. <br /> LCS Batch#: 1 LCS081794 1 LCS081794 1 LCS081794 1 LCS081794 <br /> Date Prepared: 8/17/94 8/17/94 8/17/94 8/17/94 <br /> Date Analyzed: 8/17/94 8/17/94 . 8/17/94 8/17/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LIDS <br /> Recovery: 99 100 101 103 <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 /> ignature on File the recovery of analytes from the matrix spike.does not fall within specified control limits due to matrix <br /> interference,the LCS reoovery.is to be used to validate the batch. <br /> Alan B. Kemp <br /> Project Manager <br /> 4080560.MPD <6> <br />