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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364-9600 FAX(415) 364 9233 <br /> r' 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> a- ) <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento, CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> IOMPOS Services Client Project ID Unocal #0123, 1034 Central Ave , Tracy <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrell Crider QC Sample Group 6090769-774 Reported Oct 7, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Tnchloro- Chloro- 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethane benzene ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 EPA 8010 <br /> Analyst I Dalvand I Dalvand I Dalvand i Dalvand I Dalvand I Dalvand <br /> MS/MSD <br /> Batch# 6091395 6091395 6091395 6090788 6090788 6090788 <br /> Date Prepared 9125196 9/25196 9125/96 9/25196 9125196 9125/96 <br /> Date Analyzed 9125196 9125/96 9/25/96 9125196 9125/96 9/25/96 <br /> Instrument I D # HP-7 HP-7 HP-7 HP-6 HP-6 HP-6 <br /> Conc Spiked 10 pg/L 10 pg/L 10 fig/L 10 NgIL 10 pg/L 10 pgIL <br /> Matrix Spike <br /> % Recovery 128 111 96 105 85 90 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 97 98 97 111 86 90 <br /> Relative % <br /> Difference 28 12 10 56 12 00 <br /> LCS Batch# LCS092596 LCS092596 LCS092596 LCS092595 LCS092596 LCS092596 <br /> Date Prepared 9125196 9125196 9125/96 9/25/96 9/25196 9125/96 <br /> Date Analyzed 9125/96 9/25196 9125/96 9/25196 9125/96 9125/96 <br /> Instrument I D # HP-7 HP-7 HP-7 HP-6 HP-6 HP-6 <br /> LCS % <br /> Recovery 97 102 96 104 87 94 <br /> % Recovery <br /> Control Limits 60-140 60-140 60-140 60-140 60-140 60-140 <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 File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recove is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 6090769 MPD <8> <br />