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Sequoia 680 Chesapeake Dnve 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 WWWAnalytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 PDS Services Client Project ID Unocal #0187, 437 E Miner Ave , Stockton 2401 Stanwell Dr, Ste 300 Matrix Liquid Concord, CA 94520 Attention Jarrel Crider OC Sample Group 7020227-234 Reported Feb 14, 1997 QUALITY CONTROL DATA REPORT ANALYTE Benzene Toluene Ethyl Xylenes Benzene Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 Analyst K Nill K Nill. K Nall K Nill MS/MSD Batch# 7020231 7020231 7020231 7020231 Date Prepared 2/7/97 2/7/97 2/7/97 2/7/97 Date Analyzed 2/7/97 2/7/97 2/7/97 2/7/97 Instrument I D # HP 5 HP-5 HP-5 HP-5 Cork Spiked 20Ng/L 20Ng/L 20frg/L 60pg/L Matrix Spike % Recovery 90 85 90 85 Matrix Spike Duplicate % Recovery 95 85 95 88 Relative % Difference 5 4 00 54 3 9 LCS Batch# 5LCS020797 5LCS020797 5LCS020797 9LCS020797 Date Prepared 2/7/97 2/7/97 2/7/97 2/7/97 Date Analyzed 2/7/97 2/7/97 2/7/97 2/7/97 Instrument I D # HP-5 HP-5 HP 5 HP-5 LCS % Recovery 95 85 95 87 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, #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 Wignature 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 7020227 MPD <4>