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• �a <br /> ' ~ Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415)364.9233 <br /> 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> X1,1 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 92.1-9600 FAX(916)921-0 100 <br /> MPDS Services " 'Cllent Project ID' Unocal #8015, 601 E. Kettlelnan Lane,Lodi <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 5091208-19 Reported: Oct 5, 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: K.Nill K. Nill K. Nill K.Nill <br /> MS/MSD <br /> Batch#: 5091208 5091208 5091208 5091208 <br /> Date Prepared: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 20ug/L 20pg/L 20Yg/L 60yg/L <br /> Matrix Spike <br /> % Recovery: 90 95 95 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 95 95 97 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0 <br /> LCS Batch#: 2LC8100295 2LCS100295 2LCS100295 2LCS100295 <br /> Date Prepared: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Date Analyzed: 10/2/95 10/2/95 10/2/95 10/2/95 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery: 92 96 98 97 <br /> Recovery <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 /> 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 /> 5091208.MPD <8> <br />