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Sequoia680 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)968 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento,C4 95834 (916) 911 9600 FAX(916)921 0100 <br /> OMPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave Stockton <br /> 2401 Stanwell Dr, Ste 300 Matrix Liquid <br /> Concord, CA 94520 <br /> Attention Jarrel Crider QC Sample Group 6080666-677 Reported Aug 26, 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 Chullakom 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 /> Cone Spiked 20 pg/L 20 pg/L 20 fug/L 60 fug/L <br /> Matrix Spike <br /> % Recovery 85 85 85 85 <br /> 1101 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 1 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 /> &nature 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 /> 6080666 MPD <9> <br />