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411 <br /> j SEQUOIA ANALYTICAL <br /> 1900 Bates Avenue • Suite LM • Concord, California 94520 <br /> IqW (510) 686-9600 FAX (510) 686-9689 <br /> MILDS Services, Inc Client Project 1D 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 Xyienes <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# 4011128 4011128 4011128 4011128 <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 5 HP-5 HP-5 HP 5 <br /> Conc Spiked 20 ug/L 20pg/L 20 yg/L 60 jig/L <br /> Matrix Spike <br /> % Recovery 115 110 100 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 115 105 100 101 <br /> Relative % <br /> Difference 00 4 7 0 0 099 <br /> LCS Batch# 3LCS012694 3LCS012694 3LCS012694 3LCS012694 <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-5 HP 5 HP-5 HP-5 <br /> LCS % <br /> Recovery 116 112 109 109 <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 /> PnB <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <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 /> 4AiKem <br /> Project Manager <br /> 4010940 MPf] <5> <br />