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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical <br /> p� i 1900 Bates Avenue Suite L Concord, CA 94520 (510) 686 9600 FAX (510)686 9689 <br /> Analy}tical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> *MPDS Services Client project ID Unocal # 2859, 1665 pacific Ave , Stockton <br /> 2401 Stanwell Dr, Ste 400 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Avo Avedessian QC Sample Group 4080913-919 Reported Aug 30, 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- A.Tuzon A Tuzon A Tuzon A Tuzon <br /> MS/MSD <br /> Batch# 4081035 4081035 4081035 4081035 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> Conc Spiked 20ug/L 20ug/L 20,ug/L 60Mg/L <br /> Matrix Spike <br /> % Recovery 80 85 90 93 <br /> • Matrix Spike <br /> Duplicate% <br /> Recovery. 80 90 90 93 <br /> Relative% <br /> Difference 00 57 0 0 00 <br /> i <br /> LCS Batch# 2LCS082594 2LCS082594 2LCS082594 2LCS082594 <br /> Date Prepared 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Date Analyzed 8/25/94 8/25/94 8/25/94 8/25/94 <br /> Instrument I D # HP-4 HP-4 HP4 HP-4 <br /> LCS % <br /> Recovery 85 95 100 102 <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 1s an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> OSignature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LCS recovery Is to be used to validate the batch <br /> Alan B Kemp <br /> Project Manager <br /> 4080913 MPO <6> <br />