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i <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 /> Y <br /> ....... <br /> /IPDS Services Client Project 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.Fontecha J. Fontecha J.Fontecha J:Fontecha <br /> MS/MSD <br /> Batch#: 4080616- 4080616 4080616 4080616 <br /> Date Prepared: 8/19/94 8/19/94 8/19/94 8/19/94 <br /> Date Analyzed: 8/19/94 8/19/94 8/19/94 8/19/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked- 20Ng/L 20µg/L 20Ng/L 60µg/L <br /> 1 Matrix Spike <br /> %,Recovery: too 105 110 110 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 105 107 <br /> Relative <br /> Difference: 0.0 4.9 4.7 2.8 <br /> f <br /> LCS Batch#: 1 LCS081994 1 LCS081994 1 LCS081994 1 LCS081994 <br /> Date Prepared: 8/19/94 8/19/94 8/19/94 8/19/94 <br /> Date Analyzed: 8/19/94 8/19/94 8/19/94 8/19/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 104 104 108 109 <br /> ecovery <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 /> _ r'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 recovery is to be used to-validate the batch. <br /> i Alan B. Kemp <br /> Project Manager <br /> 4080560.MPD <7> <br />