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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364-9233 <br /> 4D— 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 /> ............. <br /> ...................... i" ...... .... .... <br /> fvlPj <br /> e e roject Ib: "Unoca #6015, 601 E. ett em nLihe, <br /> L <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention. Sarkis Karkarian QC Sample Group: 5021277-285 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#: 5031568 5031568 5031568 5031668 <br /> Date Prepared: 4/7/95 4/7/95 4/7/95 4/7/95 <br /> Date Analyzed: 4/7/95 4/7/95 4/7/95 4/7/95 <br /> Instrument LID.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20pg/L 20 pg/L 20 jug/L 60 jig/L <br /> Matrix Spike <br /> % Recovery: 110 115 125 123 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 105 110 120 118 <br /> Relative% <br /> Difference: 4.7 4.4 4.1 4.1 <br /> 41. <br /> LCS Batch#., 1 LCS040795 1 LCS040795 1 LCS040795 1 LC8040795 <br /> Date Prepared: 4/7/95 4/7/95 4/7/95 4/7/95 <br /> Date Analyzed; 4/7/95 4/7/95 4/7/95 4/7/95 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 106 111 120 120 <br /> 0 ec very <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 /> eignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B. Kemp 1 interference,the LCS recovery is to be used to validate the batch. - <br /> Project Manager <br /> 5031277.MPD <5> <br />