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Y <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364.9233 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686-9689 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921-9600 FAX(916)92 1-0 100 <br /> Pi�SServices Client i�roject I15: •Unocal #0788, 8203�.i 1tli St,' racy <> <br /> 2401 Stanwell Dr., Ste. 400 Matrix: Liquid <br /> Concord, CA 94520 <br /> Avo Avedlssian QC Sample Group: 4110512-21 Reported: Nov 23, <br /> Attention: ..... ... <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#: 4110521 4110521 4110521 4110521 <br /> Date Prepared: 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Date Analyzed: 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Conc. Spiked: 20ug/L 20ug/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery: 100 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 100 100 100 103 <br /> Relative% <br /> Difference: 0.0 0.0 0.0 0.0 <br /> LCS Batch#: 1 LCS111494 1 LCS111494 1 LCS111494 1 LCS111494 <br /> Date Prepared: 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Date Analyzed: 11/14/94 11/14/94 11/14/94 11/14/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS% <br /> Recovery: 95 96 100 102 <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 /> ignature 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 /> 4110512.MPO <6> <br />