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Sequoia 680 Chesapeake Dnve Redwood GM CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> Analytical 1900 Sates Avenue,Suite L Concord,CA 94520 (510) 686-9600 FAX(510)686 9689 <br /> 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OPD,S-Services Client Project ib Unocal #5098, 5606 Pacific Avenue, Stockton' <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Sarkis Karkanan QC Sample Group 5020647-652 Reported Mar 2, 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#. 5020651 5020651 5020651 5020651 <br /> Date Prepared. 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Date Analyzed 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Instrument 1 D.# HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20 jig/L 20 jrg/L 20 frg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 90 95 95 98 <br />• Matrix Spike <br /> Duplicate% <br /> Recovery 95 100 100 100 <br /> Relative % <br /> Difference 54 51 51 2 0 <br /> LCS Batch#. 2LCS021395 2LCS021395 2LCS021395 2LCS021395 <br /> Date Prepared 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Date Analyzed: 2/13/95 2/13/95 2/13/95 2/13/95 <br /> Instrument I D.# HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 86 93 95 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 matnx <br /> Alan B Kemp interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 5020647 MPD <3> <br />