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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415)364 9233 <br /> ID 404 N Wiget Lane Walnut Creek,CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> qW Analytical 819 Striker Avenue,Suite a Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OMPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave Stockton <br /> 2401 Stanwell Dr , Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6080666-674 Reported Aug 26, 1996 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst Z T Z T Z T Z T <br /> MS/MSD <br /> Batch# 6080686 6080686 6080686 6080686 <br /> Date Prepared 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Date Analyzed 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Instrument I D # HP-3 HP-3 HP-3 HP-3 <br /> Conc Spiked 1opg/L 10frg/L 10ug/L 30,ug/L <br /> Matrix Spike <br /> % Recovery 109 101 100 96 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 104 98 97 93 <br /> Relative% <br /> Difference 47 30 30 3 2 <br /> LCS Batch# LCS081696 LCS081696 LCS081696 LCS081696 <br /> Date Prepared 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Date Analyzed 8/16/96 8/16/96 8/16/96 8/16/96 <br /> Instrument I D # HP-3 HP-3 HP-3 HP 3 <br /> LCS % <br /> Recovery 109 110 111 106 <br /> Recovery <br /> Control Limits 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, #1894 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 /> nature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 6080666 MPD <8> <br />