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G) Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> qQ0 Analytical 819 Stnker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> IO <br /> MPDS Services Client Project ID Unocal #0187, 437 E Miner Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6080640-651 Reported Aug 23, 1996 <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 S Chullakorn S Chullakorn S Chullakorn S Chullakorn <br /> MS/MSD <br /> Batch# 6080644 6080644 6080644 6080644 <br /> Date Prepared 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Date Analyzed 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Instrument I D # HP-4 HP-4 HP 4 HP-4 <br /> Conc Spiked 20 erg/L 20 pg/L 20)ug/L 60 pg/L <br /> Matrix Spike <br /> % Recovery 85 85 85 85 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 80 80 80 80 <br /> Relative% <br /> Difference 61 61 61 61 <br /> LCS Batch# 4LCS082096 4LCS082096 4LCS082096 4LCS082096 <br /> Date Prepared 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Date Analyzed 8/20/96 8/20/96 8/20/96 8/20/96 <br /> Instrument I D # HP-4 HP-4 HP-4 HP 4 <br /> LCS % <br /> Recovery 90 90 90 88 <br /> Recovery <br /> Control Limits 60-140 60-140 60 140 60-140 <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 /> eignature 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 /> 6080640 MPD <3> <br />