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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 /> DS ervices.v ,... Client project ID. Unocal #0788, 8203 . 11th St., Tracy <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian GSC Sample Group: 5020798-807 Reported: Mar 2, 1995" <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#: 5021006 5021006 5021006 5021006 <br /> Date prepared: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Date Analyzed: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> Conc. Spiked: 20ug/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> %Recovery: 85 85 90 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 85 85 90 90 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0. <br /> :.0:::::.............:........... .....,:.:::::::::....:..........:... <br /> XXXX <br /> LCS Batch#: 3LCS022295 3LCS022295 3LCS022295 3LCS022295 <br /> Date Prepared: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Date Analyzed: 2/22/95 2/22/95 2/22/95 2/22/95 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 <br /> LCS% <br /> Recovery: 88 88 89 90 <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. H <br /> signature on He 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 /> Alan B. Kemp <br /> Project Manager <br /> 5020798.MP D .45> <br />