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15) <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 /> Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921-0100 <br /> .....::.: . ....:. <br /> DS Services Client Project[D. Unocal46015, 601 E. Kettleman 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#: 5091211 5091211 5091211 5091211 <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-5 HP-5 HP-5 HP-5 <br /> Conc. Spiked: 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> Matrix Spike <br /> % Recovery: 90 95 95 97 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery: 85 90 95 95 <br /> Relative % <br /> Difference: 5.7 5.4 0.0 1.7 <br /> LCS Batch#: 3LCS100295 3LCS100295 3LCS100295 3LCS100295 <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-5 HP-5 HP-5 HP-5 <br /> LCS % <br /> Recovery: 93 92 94 96 <br /> % ecovery <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 /> �jnature 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 /> 5091208.MPD <7> <br />