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7� <br /> Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 4D- <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(916)921 0100 <br /> OWDS 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 Avedessian QC Sample Group 4041376-88 Reported May 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 J Fontecha J Fontecha J Fontecha J Fontecha <br /> MS/MSD <br /> Batch# BLK050694 BLK050694 BLK050694 BLK050694 <br /> Date Prepared 5/6/94 5/6/94 5/6/94 5/6/94 <br /> Date Analyzed 5/6/94 5/6/94 5/6/94 5/6/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 ug/L 20 ug/L 20 ug/L 60 ug/L <br /> Matrix Spike <br /> % Recovery 100 100 105 105 <br />. Matrix Spike <br /> Duplicate% <br /> Recovery 95 95 100 100 <br /> Relative% <br /> Difference 51 51 49 4 9 <br /> LCS Batch# 1 LCS050694 1 LCS050694 1 LCS050694 1 LCS050694 <br /> Date Prepared 5/6/94 5/6/94 5/6/94 5/6/94 <br /> Date Analyzed 5/6/94 5/6/94 5/6/94 5/6/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 98 100 101 102 <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 /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> e <br /> Project Manager <br /> 4041376 MPO <8> <br />