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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (41.5) 364-9600 FAX(415) 364-9233 <br /> y� <br /> a1 + 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 /> i <br /> c:.;:.;:.;:.::.: c:.;;;:.:: <br /> S Se Ices Client Protect ID: Unocal #0788,8203....................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 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 KV.S. <br /> MS/MSD <br /> Batch#: 4080556 4080556 4080556 4080556 BLK081294 <br /> Date Prepared: 8/17/94 8/17/94 8/17/94 8/17/94 8/12/94 <br /> Date Analyzed 8/17/94 8/17/94 8/17/94 8/17/94 8/18/94 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-313 <br /> Conc. Spiked: 20Ng/L 20µg/L 20Ng/L 60Ng/L 300µg/L <br /> Matrix Spike <br /> %.Recovery: 95 105 105 103 89 <br /> Matrix Spike <br /> Duplicate,% <br /> Recovery: 90 100 100 100 88 <br /> Relative% <br /> Difference: 5.4 4.9 4.9 2.9 1.1 <br /> LCS Batch#: 3LCS081794 3LCS081794 3LCS081794 3LCS081794 BLK081294 <br /> Date Prepared: 8/17/94 8/17/94 8/17/94 8/17/94 8/12/94 <br /> Date Analyzed:. 8/17/94 8/17/94 8/17/94 8/17/94 8/1$/94 <br /> Instrument I.D.#: HP-5 HP-5 HP-5 HP-5 HP-36 <br /> LCS% <br /> Recovery: 101 109 108 105 89 <br /> /o ecovery <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 />' signature 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 /> 4080560.MPD <5> <br />