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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 /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> WDS Services Client Project 10 Unocal #6348, 3788 Tracy Blvd , Tracy <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4490937-40 Reported Sep 23, 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# 4090938 4090938 4090938 4090938 <br /> Date Prepared 9/20/94 9/20/94 9/20/94 9/20/94 <br /> Date Analyzed 9/20/94 9/20/94 9/20/94 9/20/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20lig/L 20erg/L 20,ug/L 60pg/L <br /> Matrix Spike <br /> % Recovery 85 95 95 98 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 85 95 95 100 <br /> Relative % <br /> Difference 0 0 00 00 10 <br /> LCS Batch# 2LCS092094 2LC8092094 2LCS092094 2LCS092094 <br /> Date Prepared 9/20/94 9/20/94 9/20/94 9/20/94 <br /> Date Analyzed 9/20/94 9/20/94 9/20/94 9/20/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 80 93 96 99 <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 tate 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 /> gnature 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 /> 4090937 MPD <3> <br />