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M <br /> r • <br /> j SEQUOIA ANALYTICALa <br /> pe Drive Redwood City, CA 94063 <br /> limp (415) 364-9600 • FAX (415) 364-9233 <br /> M P D S Services, Inc Client Project ID Unocal, 6981 Stockton <br /> 2401 Stanwell Drive, Suite 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4BG3007 Reported Mar 1, 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 Minkel R Vincent R Vincent R Vincent <br /> MS/MSD <br /> Batch# 4BG3007 4BG3007 4BG3007 4BG3007 <br /> Date Prepared - <br /> Date Analyzed 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Instrument I D # GCHP 2 GCHP 2 GCHP 2 GCHP 2 <br /> Conc Spiked 10ug/L 10pg/L laug/L 30 jrg/L <br /> Matrix Spike <br /> % Recovery 79 88 88 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 78 88 68 90 <br /> Relative % <br /> Difference 13 0 0 00 00 <br /> LCS Batch# - _ <br /> Date Prepared - <br /> Date Analyzed <br /> Instrument I D # - <br /> LCS % <br /> Recovery - - _ - <br /> % Recovery <br /> Control Limits 71-133 72-128 72-130 71 120 <br /> Please Mote <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL 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 anaiytes 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 /> Suzanne Chin <br /> Project Manager 4BG3001 MMM <5> <br />