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SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> MPDS Services, Inc Client Project ID Unocal #6981, 4707 Pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 4010940-52 Reported Jan 31, 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# 4010926 4010926 4010926 4010926 <br /> Date Prepared 1/27/94 1/27/94 1/27/94 1/27/94 <br /> Date Analyzed 1/27/94 1/27/94 1/27/94 1/27/94 <br /> Instrument I D # HP 2 HP 2 HP 2 HP 2 <br /> Conc Spiked 20yg/L 20ug/L 20pg/L 60,ug/L <br /> Matrix Spike <br /> % Recovery 100 95 95 98 <br /> Matrix Spike <br /> is Duplicate % <br /> Recovery 95 95 90 94 <br /> Relative % <br /> Difference 5 1 00 54 42 <br /> LCS Batch# lLCS012794 1LOS012794 lLCS012794 1LCS012794 <br /> Date Prepared 1/27/94 1/27/94 1/27/94 1/27/94 <br /> Date Analyzed 1/27/94 1/27/94 1/27/94 1/27/94 <br /> Instrument I D # HP-2 HP 2 HP-2 HP-2 <br /> LCS % <br /> Recovery 109 106 108 109 <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,tnterferent 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 /> r 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 recove is to be used to validate the batch <br /> All Ke p <br /> Project Mana r <br /> 4010940 MPC <6> <br />