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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 %73 Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 0MPDS Services Client Project ID Unocal #2859, 1665 Pacific Ave Stockton 2401 Stanwell Dr, Ste 300 Matrix Liquid Concord, CA 94520 Attention Jarrel Crider QC Sample Group 6080666-677 Reported Aug 26, 1996 QUALITY CONTROL DATA REPORT ANALYTE Benzene Toluene Ethyl Xylenes Benzene Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst z T z T z T z T MS/MSD Batch# MS081596 MS081596 MS081596 MS081596 Date Prepared 8/15/96 8/15/96 8/15/96 8/15/96 Date Analyzed 8/15/96 8/15/96 8/15/96 8/15/96 Instrument I D # HP-3 HP-3 HP-3 HP-3 Conc Spiked 10 fig/L 10 fig/L 10 fig/L 30 fig/L Matrix Spike % Recovery 72 67 65 87 . Matrix Spike Duplicate % Recovery 71 66 65 90 Relative% Difference 1 4 is 0 0 3 4 LCS Batch# LCS081596 LCS081596 LCS081596 LCS081596 Date Prepared 8/15/96 8/15/96 8/15/96 8/15/96 Date Analyzed 8/15/96 8/15/96 8/15/96 8/15/96 Instrument I D # HP-3 HP-3 HP-3 HP-3 LCS % Recovery 88 81 80 111 Recovery Control Limits 60-140 60-140 60-140 60-140 Please Note The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, SEQUOIA ANALYTICAL, #1894 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample fortified with known quantities of specific compounds and subjected to the entire analytical procedure If *nature on File the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix interference,the LCS recovery is to be used to validate the batch Alan B Kemp Project Manager 6080666 MPD <6>