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i` i/ ■ 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 9673 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 • MPD$ Services Client Project ID Unocal #2859, 1665 Pacific Ave , Stockton 2401 Stanwell Dr , Ste 300 Matrix Liquid Concord, CA 94520 Attention Jarrell Crider QC Sample Group 6050811-22 Reported May 29, 1996 QUALITY CONTROL DATA REPORT ANALYTE Benzene Toluene Ethyl Xylenes Benzene Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst S Chullakorn S Chullakorn S Chullakorn S Chullakorn MS/MSD Batch# 6051067 6051067 6051067 6051067 Date Prepared 5/16/96 5/16/96 5/16/96 5/16/96 Date Analyzed 5/16/96 5/16/96 5/16/96 5/16/96 Instrument I D # HP-9 HP-9 HP 9 HP-9 Conc Spiked 20 ug/L 20 ug/L 20 us/L 60 ug/L Matrix Spike % Recovery 115 125 130 127 . Matrix Spike Duplicate % Recovery 95 105 110 107 Relative % Difference 19 17 17 17 LCS Batch# 91-CS051696 9LCS051696 9LCS051696 9LOS051696 Date Prepared 5/16/96 5/16/96 5/16/96 5/16/96 Date Analyzed 5/16/96 5/16/96 5/16/96 5/16/96 Instrument ID # HP-9 HP-9 HP-9 HP-9 LIT�+S % Recovery 105 115 120 118 % ecovery 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, #1271 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 �ignature 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 6050811 MPD <6> tScy