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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) 988-9600 FAX(510)988.9673 <br /> Analytical 819 Striker Avcnue,Swtc 8 Sacramento,CA 95834 (916) 921.9600 FAX(916)921-0100 <br /> qp' $Services CI'ient Project ID: Unocal #0788 8203 E '11th St. Trac <br /> 1 � y <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group: Reported: <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: 0 0 0 <br /> MS/MSD <br /> Batch#: 0 0 0 <br /> Date Prepared: 1/0/00 1/0/00 1/0/00 <br /> Date Analyzed: 1/0/00 1/0/00 1/0/00 1/0/00 <br /> Instrument I.D.#: 0 o a <br /> Conc.Spiked: 20ug/L 20ug/L 20ug/L 6opg/L <br /> Matrix Spike <br /> % Recovery: <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: <br /> Relative% <br /> Difference: <br /> LCS Batch#: 0 a 0 <br /> Date Prepared: 1/0/00 1/0/00 1/0/00 1/0/00 <br /> Date Analyzed: 1/0/00 1/0/00 1/0/00 1/0/00 <br /> Instrument I.D.#: 0 a o 0 <br /> LCS % <br /> Recovery: <br /> ecovery <br /> Control Limits: 60-140 60-140 60-140 60-140 <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 /> Onature 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 /> 6110476.MPD <6> <br />