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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 94570 (510) 686 9600 FAX(510)686 9689 <br /> WoAnalytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> OPOS Services, Inc Client Project ID Unocal #6348, 3788'Tracy Blvd ,Tracy <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 4030443-446 Reported Mar 18, 1994 <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 E Vomund E Vomund E Vomund E Vomund <br /> MS/MSD <br /> Batch# 4030443 4030443 4030443 4030443 <br /> Date Prepared 3/17/94 3/17/94 3/17/94 3/17/94 <br /> Date Analyzed 3/17/94 3/17/94 3/17/94 3/17/94 <br /> Instrument I D # ML#2 ML#2 ML#2 ML#2 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 pg/L <br /> Matrix Spike <br /> %Recovery 85 85 85 85 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 105 105 115 108 <br /> Relative% <br /> Difference 21 21 30 24 <br /> LCS Batch# LCS031794 LCS031794 LCS031794 LCS031794 <br /> Date Prepared 3/17/94 3/17/94 3/17/94 3/17/94 <br /> Date Analyzed 3/17/94 3/17/94 3/17/94 3/17/94 <br /> Instrument I D # ML#2 ML#2 ML#2 ML#2 <br /> LCS % <br /> Recovery 90 90 90 90 <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 /> jolecfortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recoveryis to be used to validate the batch <br /> Kemp <br /> t <br /> Manage <br /> 4030443 MPD <2> <br />