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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord,.California 94520 <br /> ' 11I (510) 686-9600 FAX (510) 686-9689 <br /> i :::.::.>:.::.:: .......... <br /> MPDS services, Inc. Clienhf"Project ID: Unocal 0788, 8203 E. 11th St.,Tracy <br /> 2401 Stanwell Dr., Ste. 400 Matrix: Liquid <br /> x. <br /> Concord, CA 94520 <br /> Attention: Avo Avedissian QC Sample Group: 4021110-19 Reported: Mar 7, 1994::; <br /> QUALITY CONTROL DATA REPORT <br /> I ANALYTE Benzene Toluene Ethyl Xylenes <br /> -Benzene <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> r' Analyst: A.Tuzon A.Tuzon A.Tuzon A.Tuzon <br /> MS/MSD <br /> Batch#: 4021248 4021248 4021248 4021248 <br /> Date Prepared: 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Date Analyzed: 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> Conc. Spiked: 20 Ng/L 20µg/L 20µg/L. 60 Ng/L <br /> s _ <br /> Matrix Spike <br /> % Recovery: 100 100 100 100 <br /> Matrix Spike <br /> Duplicate <br /> Recovery: 100 100 100 100 <br /> Relative <br /> Difference: 0.0 0.0 0.0 0.0 <br /> Xxxx <br /> LCS Batch#: 2LCS030194 2LCS030194 2LCS030194 2LCS030194 _ <br /> Date Prepared: 3/1/94 3/1/94 3/1/94 3/1/94 <br /> I- Date Analyzed: 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Instrument I.D.#: HP-4 HP-4 HP-4 HP-4 <br /> LCS <br /> Recovery: 95 94 94 95 <br /> i <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 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 /> 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 /> n B. Kem <br /> Project Manager - <br /> i 4021110.MPD <6> <br />