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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) 9889600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921.96600 FAX(916)921-0100 <br /> MADS Services ;. ... _. ..... .... . <br /> CfferitF�roject li]: Unocal #0788, 8203 E. 11th St., Bracy <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarlan QC Sample Group 5100832-841 Reported: Oct 27, 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.Niil <br /> MS/MSD <br /> Batch#: 5100971 5100971 5100971 5100971 <br /> Date Prepared: 10/23/95 10/23/95 10/23/95 10/23/95 <br /> Date Analyzed: 10/23/95 10/23/95 10/23/95 10/23/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> Conc. Spiked: 20Ng/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery: 95 95 90 100 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 95 95 95 103 <br /> (Relative % <br /> Difference: 0.0 0.0 5.1 3.3 <br /> LCS Batch#: 4LCS102395 4LCS102395 4LCS102395 4LCS102395 <br /> Date Prepared: 10/23/95 10/23/95 10/23/95 10/23/95 <br /> Date Analyzed: 10/23/95 10/23/95 10/23/95 10/23/95 <br /> Instrument I.D.#: HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery: 84 85 83 91 <br /> LRecovery <br /> ontrol 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 /> EQUOIA 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 /> Alan B. Kemp interference,the LCS recovery is to be used to validate the batch. <br /> Project Manager <br /> 5100832.MPD <5> <br />