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4DD404 <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415)364-9233 <br /> N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0 100 <br /> i�DS Services Client Project ID: Unocal #0788, 8203 E. 11th'St., Tracy <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5100832-841 Reported: Oct 27, 1995; <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst: M.Creusere M.Creusere M.Creusere M.Creusere J.Dinsay <br /> MS/MSD <br /> Batch#: 5101492 5101492 5101492 5101492 BLK101295 <br /> Date Prepared: 10/24/95 10/24/95 10/24/95 10/24/95 10/12/95 <br /> Date Analyzed: 10/24/95 10/24/95 10/24/95 10/24/95 10/13/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 GCHP-3B <br /> Conc. Spiked: 20ug/L 20ug/L 20ug/L 60ug/L 300ug/L <br /> Matrix Spike <br /> % Recovery: 100 100 100 110 70 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 108 86 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 1.5 17 <br /> LCS Batch#: 4LCS102495 4LCS102495 4LC8102495 4LC8102495 LCS101295 <br /> Date Prepared: 10/24/95 10/24/95 10/24/95 10/24/95 10/12/95 <br /> Date Analyzed: 10/24/95 10/24/95 10/24/95 10/24/95 10/13/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 GCHP-3B <br /> LCS% <br /> Recovery: 91 93 93 100 90 <br /> Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 38-122 <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 /> gnature 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 S. Kemp <br /> Project Manager <br /> 5100832.MPD <6> <br />