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4` <br /> SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (415) 364-9600 FAX (415) 364-9233 <br /> MPDS � <br /> Services, Inc Client Project ID Unocal, 6981 Stockton <br /> 2401 Stanwell Drive, Suite 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4BG3004-06 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 R Vincent 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-17 GCHP-17 GCHP-17 GCHP 17 <br /> Conc Spiked 10 ug/L 10 ug/L 10,ug/L 30 ug/L <br /> Matrix Spike <br /> % Recovery 78 92 92 sa <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 81 93 95 90 <br /> Relative % <br /> Difference 38 11 32 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 Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> iSEQUOIA 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 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 /> Suzanne Chin <br /> Project Manager 4BG3001 MMM <4> <br />