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4D 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 /> %07 Analytical 819 Sinker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> WPDS Services Client Project Ib Unocal #5421, 7303 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 412-0414 Reported Dec 19, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethane benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst K Nill K Nill K Nill <br /> MS/MSD <br /> Batch# 4120414 4120414 4120414 <br /> Date Prepared 1219194 1219194 1219194 <br /> Date Analyzed 1219/94 1219194 12/9/94 <br /> Instrument I D # HP5890/6 HP5890/6 HP5890/6 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L <br /> Matrix Spike <br /> % Recovery 94 105 100 <br /> ORMatrix Spike <br /> Duplicate % <br /> Recovery 99 109 102 <br /> Relative% <br /> Difference 52 37 20 <br /> LCS Batch# LCS120994 LCS120994 LCS120994 <br /> Date Prepared 1219194 1219194 1219194 <br /> Date Analyzed 1219/94 1219194 1219194 <br /> Instrument i D # HP589016 HP5890/6 HP5890/6 <br /> LCS % <br /> Recovery 127 107 94 <br /> ecovery <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 <br /> 4120414 MPD <6> <br />