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. 7 <br /> •f680 Chesapeake Drive Redwood City,CA 94063 (415) 364.9600 FAX(415) 364.9233 <br /> Sequoia <br /> 404 N.Wiget lane Walnut Creek,CA 94598 (510) 988-9600 FAX(510)988-9673 <br /> ill Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX(916)921.0100 <br /> M15i7S Services - + Client-Project its: Unocal#5421, 7303.Pacific Aye., Stockton <br /> 2401 Stanwell Dr., Ste. 300 Matrix: Liquid <br /> Concord, CA 94520 <br /> Attention: Sarkis Karkarian QC Sample Group: 506-0592 Reported: Jun 23, 1995:", <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethene benzene <br /> Method: EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: K.Nill K.Nill K.Nill <br /> MS/MSD <br /> Batch#: 5060592 5060592 5060592 <br /> Date Prepared: 6116195 6116195 6/16/95 <br /> Date Analyzed: 6116195 6116195 6/16/95 <br /> Instrument I.D.#: 5809!7 5809!1 5809f7 <br /> Conc. Spiked: 10 pg/L 10 NgIL 10 NgIL <br /> Matrix Spike <br /> %Recovery: 67 69 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 83 76 79 <br /> Relative % <br /> Difference: 21 11 7.3 <br /> LCS Batch#: LCS061695 LCS061695 LCS061695 <br /> Date Prepared: 6116/95 6116195 6116195 <br /> Date Analyzed: 6116195 6116195 6116/95 <br /> Instrument I.D.#: 5809f7 5809f7 5809f7 <br /> LCS % <br /> Recovery: 79 85 70 <br /> o Recovery <br /> Control Limits: 28-167 35-146 38-150 <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 /> Signature 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 j <br /> 5060592.MPD <6> <br />