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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510)988-9673 <br />" <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> � <br /> OMPDS Services Client Project ID Unocal #0123, 1034 Central Ave , 7racy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider OC Sample Group 7120369-73 Reported Dec 23, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Tnchloro- Chloro- <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst M McLachlan M McLachlan M McLachlan <br /> MS/MSD <br /> Batch# 9712401-01 9712401-01 9712401-01 <br /> Date Prepared 12/15/97 12/15/97 12/15/97 <br /> Date Analyzed 12/16/97 12/16/97 1211(3/97 <br /> Instrument l D # HP-24 HP-24 HP-24 <br /> Conc Spiked 25 Ng/L 25 pg/L 25 pg/L <br /> Matrix Spike <br /> % Recovery 112 40 120 <br />• Matrix Spike <br /> Duplicate% <br /> Recovery 132 124 128 <br /> Relative% <br /> Difference 15 70 65 <br /> LCS Batch# LCS121697 LCS121697 LCS121697 <br /> Date Prepared 12/16/97 12/15/97 12/15/97 <br /> Date Analyzed 12/16/97 12/16/97 12/16/97 <br /> Instrument I D # HP-24 HP-24 HP-24 <br /> LCS % <br /> Recovery 120 108 116 <br /> Recovery <br /> Control Limits 65-135 70-130 70-130 <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, #1210 preparation,and analytical methods employed for the samples The matrix spike 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and sub)ected 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 /> 7120369 MPD <10> <br />