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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 <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916) 921-0100 <br /> W6 'Services Client Prosect Ib:'�.Unocal #0788, 8203 .i it�i St; 1=racy <br /> :Z> 2401 Stanwell Dr., Ste. 400 Matrix: Liquid <br /> Concord, CA 94520 <br /> ? Attention: Avo Avedissian QC Sample Group: 4110512-21 Reported: Nov 23, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> EPA <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 8015 Mod. <br /> Analyst: J.Fontecha J. Fontecha J. Fontecha J.Fontecha K.V.S. <br /> MS/MSD <br /> Batch#: 4110552 4110552 4110552 4110552 BLK111494 <br /> Date Prepared: 11/14/94 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Date Analyzed: 11/14/94 11/14/94 11/14/94 11/14/94 11/18/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> Cone. Spiked: 2opg/L 20ftg/L 20ug/L 60pg/L 300 Erg/L <br /> Matrix Spike <br /> % Recovery: 80 90 95 95 80 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 80 90 95 97 70 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 2.1 13 <br /> LCS Batch#: 2LCS111494 2LC5111494 2LCS111494 2LCS111494 BLK111494 <br /> Date Prepared: 11/14/94 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Date Analyzed: 11/14/94 11/14/94 11/14/94 11/14/94 11/18/94 <br /> instrument I.D.#: HP-4 HP-4 HP-4 HP-4 HP-3A <br /> LCS% <br /> Recovery: 76 84 86 86 80 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 28-122 <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 /> Oignature 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 /> Alan B. Kemp <br /> Project Manager <br /> 4110512.MPD <5> <br />