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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue e Suite LM a Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> QPOS Services Client Project I'D: Unocal 0788, 8203 East 11th Streef,Tracy <br /> : e"4-01 Stanwell Dr., Ste. 400 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Avo Avedessian QC Sample Group: 3120109-18 Reported: Dec 16, 1993 : <br /> ... <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br />` ANALYTE Benzene Toluene Ethyl Xylenes Diesel <br /> i <br /> j Benzene <br />'t <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 EPA 8015 <br /> Analyst: J.Dinsay J.Dinsay J. Dinsay J. Dinsay K.Wimer <br /> MS/MSD <br /> Batch#: 3120109 3120109 3120109 3120109 BLK120793 <br /> Date Prepared: 12/10/93 12/10/93 12/10/93 12/10/93 12/7/93 <br /> Date Analyzed: 12/10/93 . 12/10/93 12/10/93, 12/10/93 12/9/93 <br /> Instrument I.D.#: ML#2 ML#2 ML#2 ML#2 HP-3A <br /> I Conc. Spiked: 20Ng/L 20Ng/L 20g/L 60Ng/L 300 Ng/L <br /> i <br /> Matrix Spike <br /> % Recovery: 104 113 130 127 93 <br /> 1 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 115 108 113 113 97 <br /> r <br /> Relative <br /> Difference: 10 4.5' 14 12 4.2 <br /> ...........:.....:........::.:::.:::::::.....:......::.. <br /> i :;:>:::;:.::::;:.::: :: <br /> .. ....::.. :.....::.;.:::.>:.:... <br /> LCS Batch#: LCS121093 LCS121093 LCS121093 LCS121093 BLK120793 <br /> Date Prepared: 12/10/93 12/10/93 12/10/93 12/10/93 12/7/93 <br /> Date Analyzed: 12/10/93 12/10/93 12/10/93 12/10/93 12/9/93 <br /> Instrument I.D.#: ML#2 ML#2 ML#2 ML#2 HP-3A <br /> i <br /> i <br /> LCS <br /> j Recovery: 85 93 104 104 93 <br /> I: % Recovery <br /> Control Limits: 71-133 72-128 72-130 71-120 80-120 <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 preparation,and analytical methods employed for the samples. The matrix spike is an aliquot of sample <br />�+ J fortified with known quantities of specific compounds and subjected to the entire analytical procedure. If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> \ interference,the LCS recovery is to be used to validate the batch. <br /> I Alar�B'Kemp� <br /> Project Manager <br /> 3120109.MPD <5> <br /> i <br /> i <br />