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1 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 (510)686 9689 <br /> qW Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> IOMPDS Services Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr , Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedlssian OC Sample Group 4101833-845 Reported Nov 11, 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 A Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4101926 4101926 4101926 4101926 <br /> Date Prepared 11/4/94 11/4/94 11/4/94 11/4/94 <br /> Date Analyzed 11/4/94 11/4/94 11/4/94 11/4/94 <br /> Instrument I D# HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20 frg/L 20yg/L 20yg/L 60pg/L <br /> Matrix Spike <br /> %Recovery 80 90 90 92 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 85 95 95 97 <br /> Relative% <br /> Difference 61 54 54 53 <br /> LCS Batch# 2LCS110494 2LCS110494 2LCS110494 2LCS110494 <br /> Date Prepared 11/4/94 11/4/94 11/4/94 11/4/94 <br /> Date Analyzed 11/4/94 11/4/94 11/4/94 11/4/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 80 91 94 95 <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 1s 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 /> 4101833 MPD <6> <br />