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SEQUOIA ANALYTICAL <br /> 680 Chesapeake Drive • Redwood City, CA 94063 <br /> (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 QC Sample Group 4BG3001-03 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 J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 4BE5808 4BE5808 4BE5808 4BE5808 <br /> Date Prepared - - <br /> Date Analyzed 3/1/94 3/1/94 3/1/94 3/1/94 <br /> Instrument I D # GCHP 3 GCHP-3 GCHP-3 GCHP-3 <br /> Conc Spiked 10yg/L 10Ng/L 10ug/L 30pg/L <br /> Matrix Spike <br /> % Recovery 95 95 96 97 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 99 98 99 100 <br /> Relative % <br /> Difference 4 1 31 31 30 <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 /> SEQUOIA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> l fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> —� r 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 <3> <br />