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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# 4010920 4010920 4010920 4010920 <br /> Date Prepared 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Date Analyzed 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Instrument I D # HP-2 HP 2 HP-2 HP 2 <br /> Cone Spiked 20Vg/L 20,ug/L 20ug/L 60lig/L <br /> Matrix Spike <br /> % Recovery 115 110 110 113 <br /> Matrix Spike <br /> 90 Duplicate% <br /> Recovery 110 105 110 110 <br /> Relative % <br /> Difference 44 46 00 27 <br /> LCS Batch# lLCS012694 lLCS012694 1LCS012694 1LCS012694 <br /> Date Prepared 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Date Analyzed 1/26/94 1/26/94 1/26/94 1/26/94 <br /> Instrument I D # HP-2 HP 2 HP 2 HP 2 <br /> LCS % <br /> Recovery 98 95 94 96 <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 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 recoveryis to be used to validate the batch <br /> p <br /> Project an r <br /> 4010940 MPD <7> <br />