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■ { Sequoia 680 Chesapeake Dnve Redwood City, CA 94063 (4t5) 364 9600 FAX(415)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 %00 FAX(510)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento,CA 95834 {916) 921 9600 FAX{916)921 0100 <br /> V60 AnalytYea1* l <br /> MPDS Services Client Project ID Unocal #5098 <br /> 1 , 5606 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Solid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5091615-20 Reported Oct 5, 1995 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Trichloro- Chloro- <br /> ethene ethene benzene <br /> Method EPA 8010 EPA 8010 EPA 8010 <br /> Analyst I z I z I z <br /> MS/MSD <br /> Batch# 5091362 5091362 5091362 <br /> Date Prepared 9/28195 9/28/95 9/28195 <br /> Date Analyzed 9/28/95 9128195 9/28195 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> Conc Spiked 10 pg/L 10 pg/L 10 pg/L <br /> Matrix Spike <br /> % Recovery 88 111 77 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 77 92 77 <br /> Relative % <br /> Difference 13 19 00 <br /> LCS Batch# LCS092895 LCS092895 LCS092895 <br /> Date Prepared 9/28195 9/28195 9128/95 <br /> Date Analyzed 9128195 9128195 9/28/95 <br /> Instrument I D # HP-7 HP-7 HP-7 <br /> LCS % <br /> Recovery 85 97 79 <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 /> 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 /> 5091615 MPD <7> <br />