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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> -• �„� Analytical 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> 10PDS Services Client Project ID Unocal #5421, 7303 Pacific Ave , Stockton <br /> ,401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 5120248-254 Reported Dec 19, 1995, <br /> t <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichioro- Tnchloro- Chloro- Diesel <br /> ethane ethene benzene <br /> Method- EPA 8010 EPA 8010 EPA 8010 EPA 8015 <br /> Analyst I Z I Z I Z J Dinsay <br /> MS/MSD <br /> Batch#. 5112167 5112167 5112167 BLK120595 <br /> Date Prepared- 12/6/95 12/6/95 12/6/95 12/5/95 <br /> Date Analyzed 12/6/95 12/6/95 12/6/95 12/6/95 <br /> Instrument 1.13 #- HP-7 HP-7 HP-7 GCHP-313 <br /> Conc Spiked 10,vg/L 10pg/L 10ftg/L 300 Ng/L <br /> Matrix Spike <br /> % Recovery 92 95 75 123 <br /> 40 Matrix Spike <br /> Duplicate% <br /> Recovery 97 100 81 117 <br /> Relative% <br /> Difference 53 51 77 5 6 <br /> LCS Batch# LCS120695 LCS120695 LCS120695 LCS120595 <br /> Date Prepared: 12/6/95 12/6/95 12/6/95 12/5/95 <br /> Date Analyzed 12/6/95 12/6/95 12/6/95 12/6/95 <br /> Instrument I D.# HP-7 HP-7 HP-7 GCHP-313 <br /> LCS % <br /> Recovery: 86 92 74 117 <br /> % ecovery <br /> Control Limits- 28-167 35-146 38-150 38-122 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br />�EQUOIA 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 5120248 MPD <77 <br />