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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord,CA 94520 (510) 686 9600 FAX(5 10)686 9689 <br /> 'Wr Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(9 16)921 0100 <br /> OMPOS Services Client Project Ib Unocal #2859, 1665 Pacific Avenue, Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkarian QC Sample Group 5020605-13 Reported Feb 23, 1995 <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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 5020794 5020794 5020794 5020794 <br /> Date Prepared 2/21/95 2/21/95 2/21/95 2/21/95 <br /> Date Analyzed 2/21/95 2/21/95 2/21/95 2/21/95 <br /> Instrument I D# HP-4 HP-4 HP-4 HP 4 <br /> Cone Spiked 20pg/L 20pg/L 20pg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 85 95 95 95 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 85 95 95 95 <br /> Relative% <br /> Difference 0 0 0 0 00 00 <br /> LCS Batch# 2LCS022195 2LCS022195 2LCS022195 2LCS022195 <br /> Date Prepared 2/21/95 2/21/95 2/21/95 2/21/95 <br /> Date Analyzed 2/21/95 2/21/95 2/21/95 2/21/95 <br /> Instrument I D# HP-4 HP-4 HP-4 HP-4 <br /> LCS% <br /> Recovery 88 95 96 96 <br /> %Recovery <br /> Control Limits 71-133 72-128 72-130 71-120 <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 /> 5020605 MPD <4> <br />