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4D Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 1WF Analytical B19 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> DS Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton <br /> 401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian OC Sample Group 4091286-291 Reported Oct 5, 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# 4091562 4091562 4091562 4091562 <br /> Date Prepared 9/27/94 9/27/94 9/27/94 9/27/94 <br /> Date Analyzed 9/27/94 9/27/94 9/27/94 9/27/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> Conc Spiked 20,ug/L 20pg/L 20,ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 105 110 120 120 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 105 110 120 120 <br /> Relative % <br /> Difference 00 00 00 00 <br /> LCS Batch# 1 LCS092794 1 LCS092794 1 LCS092794 1 LCS092794 <br /> Date Prepared 9/27/94 9/27/94 9/27/94 9/27/94 <br /> Date Analyzed 9/27/94 9/27/94 9/27/94 9/27/94 <br /> Instrument I D # HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery 90 96 104 105 <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, #1271 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 /> ignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Alan B Kemp Interference,the LCS recovery is to be used to validate the batch <br /> Project Manager <br /> 4091286 MPD <10> <br /> yrY <br />