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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900$ates Avenue Suite L Concord, CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> A4DW Analytical 819 Straker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> IDS <br /> Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 1 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4091286-291 Reported Oct 5, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichlorc- 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# 4091286 4091286 4091286 <br /> Date Prepared 9128/94 9/28194 9128194 <br /> Date Analyzed 9/28/94 9/28194 9/28/94 <br /> Instrument I D # HP5890116 HP5890116 HP5890116 <br /> Conc Spiked 10 pg/l- 10 pg/L 10 pg/L <br /> Matrix Spike <br /> Recovery 105 115 97 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 122 99 <br /> Relative % <br /> Difference 47 59 20 <br /> LCS Batch# LCS092894 LCS092894 LCS092894 <br /> Date Prepared 9128194 9128/94 9/28194 <br /> Date Analyzed 9128194 9128/94 9128194 <br /> Instrument I D # HP5890116 HP5890116 HP5890/16 <br /> LCS % <br /> Recovery 94 96 98 <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 /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> ignature on Pile 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 /> 4091286 MPD <11> <br />