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i <br /> (D— 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 /> qW Analytical 8 t 9 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ITS Services Client Project ID Unocal #5421, 7303 Pacdic Ave, Stockton <br /> 2401 Stanwell Dr , Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedesslan QC Sample Group 406-0357 Reported Jun 21, 1994 <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# 4060357 4060357 4060357 <br /> Date Prepared 6/16/94 6/16/94 6/16/94 <br /> Date Analyzed 6/16/94 6/16/94 6/16/94 <br /> Instrument I D # HP5890/7 HP5890/7 HP5890/7 <br /> Conc Spiked lapg/L 10pg/L 10pg/L <br /> Matrix Spike <br /> % Recovery 67 59 89 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 75 71 92 <br /> Relative% <br /> Difference 11 18 33 <br /> LCS Batch# LCS061694 LCS061694 LCS061694 <br /> Date Prepared 6/16/94 6/16/94 6/16/94 <br /> Date Analyzed 6/16/94 6/16/94 6/16/94 <br /> Instrument I D # HP5890/7 HP5890/7 HP5890/7 <br /> LCS % <br /> Recovery 90 84 94 <br /> 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 /> t1fortified 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 /> A Ke <br /> Project Man er <br /> 4060357 MPD <6> <br />