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A <br /> SEQUOIA ANALYTICAL <br /> 1900 Sates Avenue • Suite LM • Concord, California 94520 <br /> (510) 686-9600 FAX (510) 686-9689 <br /> MPDS Services, Inc Client Project 10 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# 4011136 4011136 4011136 4011136 <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 4 HP-4 HP-4 HP 4 <br /> Conic Spiked 20Mg/L 20,ug/L 20mg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 90 90 90 92 <br /> Matrix Spice <br /> Duplicate % <br /> Recovery 95 95 95 95 <br /> Relative % <br /> Difference 54 54 54 32 <br /> LCS Batch# 2LCS012794 2LCS012794 2LCS012794 2LCS012794 <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 4 HP 4 HP-4 HP 4 <br /> LCS % <br /> Recovery 87 85 86 67 <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 /> K m <br /> tAl <br /> Project Manager <br /> 4010940 MPD <8> <br />