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-y 4 <br /> i <br /> 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 #2859, 1665 Pacific Ave, Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedissian QC Sample Group 4021427-33 Reported Mar 8, 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# 4021601 4021501 4021601 4021601 <br /> Date Prepared 3/3/94 3/3/94 3/3/94 3/3/94 <br /> Date Analyzed 3/3/94 3/3/94 3/3/94 3/3/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conic Spiked 20ug/L 20pg/L 20yg/L 60ug/L <br /> Matrix Spike <br /> % Recovery 110 105 105 105 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 105 100 102 <br /> Relative % <br /> Difference 00 0 0 49 29 <br /> LCS Batch# 2LCS030394 2LCS030394 2LCS030394 2LCS030394 <br /> Date Prepared 3/3/94 3/3/94 3/3/94 3/3/94 <br /> Date Analyzed 3/3/94 3/3/94 3/3/94 3/3/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 105 103 103 103 <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 /> fortified with known quantifies of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fail within specified control limits due to matrix <br /> interference,the LCS recovn is to be used to validate the batch <br /> A an B K <br /> Project Manager <br /> 4021427 MPD <3> <br />