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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 1900 Bates Avenue,Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 DS Services Client Project ID Unocal #5098, 5606 Pacific Ave , Stockton 401 Stanwell Dr, Ste 400 Matrix Liquid Concord, CA 94520 Attention Avo Avedessian QC Sample Group 4091286-291 Reported Oct 5, 1994 QUALITY CONTROL DATA REPORT ANALYTE Benzene Toluene Ethyl Xylenes Benzene Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst J Fontecha J Fontecha J Fontecha J Fontecha MS/MSD Batch# 4091567 4091567 4091567 4091567 Date Prepared 9/27/94 9/27/94 9/27/94 9/27/94 Date Analyzed 9/27/94 9/27/94 9/27/94 9/27/94 Instrument I D # HP-5 HP-5 HP-5 HP-5 Conc Spiked 20pg/L 20ug/L 20Ng/L 60lig/L Matrix Spike % Recovery 95 105 105 105 0 Matrix Spike Duplicate% Recovery 95 100 100 100 Relative% Difference 0 0 49 4 9 4 9 LCS Batch# 3LCS092794 3LCS092794 3LCS092794 3LCS092794 Date Prepared 9/27/94 9/27/94 9/27/94 9/27/94 Date Analyzed 9/27/94 9/27/94 9/27/94 9/27/94 Instrument I D # HP-5 HP-5 HP-5 HP-5 LCS % Recovery 107 114 116 113 % ecovery Control Limits 71-133 72-128 72-130 71-120 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 Alan B Kemp Interference,the LCS recovery Is to be used to validate the batch Project Manager 4091286 MPD <9>