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9�D <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX (510) 686 9689 <br /> qW Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> PDS Services Client Project ID Unocal #0187, 437 E Miner Ave, Stockton <br /> 01 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedlssian QC Sample Group 4081469-71 Reported Sep 6, 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# BLK083094 BLK083094 BLK083094 BLK083094 <br /> Date Prepared 8/30/94 8/30/94 8/30/94 8/30/94 <br /> Date Analyzed 8/30/94 8/30/94 8/30/94 8/30/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20 Hall- 20pg/L 20ug/L 60ug/L <br /> Matrix Spike <br /> % Recovery 95 100 110 103 <br /> . Matrix Spike <br /> Duplicate% <br /> Recovery 90 95 100 103 <br /> i <br /> Relative% <br /> Difference 54 51 95 00 <br /> LCS Batch# 1 LCS083194 1 LCS083194 1 LCS083194 1 LCS083194 <br /> Date Prepared 8/31/94 8/31/94 8/31/94 8/31/94 <br /> Date Analyzed 8/31/94 8/31/94 8/31/94 8/31/94 <br /> Instrument I D.# HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 100 105 112 112 <br /> % ecovery <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 /> 0 1 ignature on File 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 /> Alan B Kemp <br /> Project Manager <br /> 4081469 MPD <5> <br />