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• <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> ta�— 404 N.Wiget Lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> Analytical <br /> 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> ................ -..... ......... e..........'". . .... ...... <br /> MPlJS'Servlces lent ProjectID. Unocal #6015, 66tt. 6ftlman Lane, Lodi <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian OC Sample Group: 5031277-285 Reported: Apr 12, 1995.,.,.' <br /> .... ...... ......... .... . <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#: 5031194 5031194 5031194 5031194 <br /> Date Prepared: 4/6/95 4/6/95 4/6/95 4/6/95 <br /> Date Analyzed: 4/6/195 4/6/96 4/6/95 4/6/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20 pg/L 20 pg/L 20 pg/L 60 jug/L <br /> Matrix Spike . <br /> % Recovery: 100 105 110 110 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 110 115 125 123 <br /> Relative% <br /> Difference: 9.5 9.1 13 11 <br /> ............ . ...... <br /> ............ <br /> -K .. ............. <br /> IX <br /> .................... ......... <br /> LCS Batch#.* L=40695 LCS040695 LCS040695 LCS040695 <br /> Date Prepared: 4/6/95 4/6/95 4/6/95 4/6/95 <br /> Date Analyzed: 4/6/95 4/6/95 4/6/95 4/6/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS% <br /> Recovery: 113 115 125 125 <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 /> 019nature on File the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> 1 interference,the LCS reocivea is to be used to validate the batch, <br /> Alan B. Kemp ll <br /> Project Manager <br /> 5031277.MPD <3> <br />