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Sequoia 680 Chesapeake Drove Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Bates 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(9t6)921 Ot00 <br /> WPOS Services Client project Ib Unocal #2859, 1665 pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4051180-86 Reported Jun 10, 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# 4051186 4051186 4051186 4051186 <br /> Date Prepared 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Date Analyzed 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20,ug/L 20pg/L 60pg/L <br /> Matrix Spike <br /> % Recovery 95 95 95 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 100 105 100 103 <br /> Relative% <br /> Difference 51 10 51 49 <br /> LCS Batch# 2LCS060394 2LCS060394 2LCS060394 2LCS060394 <br /> Date Prepared 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Date Analyzed 6/3/94 6/3/94 6/3/94 6/3/94 <br /> Instrument I D# HP-4 HP-4 HP 4 HP-4 <br /> LCS % <br /> Recovery 90 90 90 92 <br /> Recovery <br /> Control Limits 71-133 72-128 72-130 71 120 <br /> Please Note <br /> The LCS 1s 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 1s an aliquot of sample <br /> . fortified 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 recovery1s to be used to validate the batch <br /> Ke p <br /> Project Man er <br /> 4051180 MPD <4> <br />