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• 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)9BB-9673 <br /> $19 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 5 1 ) 1455 McDowell Blvd North Ste D Petaluma CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical <br /> ]551 Industrial Road San Carlos,CA 94070-4 t l 1 (650)232-9600 FAX(650)232-9612 <br /> ettler-Ayanf`Obblm " v Client Project lD Unocal 88#5098, Stockton n " <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 ` <br /> Attention Deanna Harding GSC Sample Group 9061562-579 Reported Jun 30, 1999 <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- J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 9061543 9061543 9061543 9061543 <br /> Date Prepared 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Date Analyzed 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Instrument i D # HP 4 HP-4 HP-4 HP 4 <br /> Conc Spiked 20ug/L 20ug/L 20pg/L 6aug/L <br /> Matrix Spike <br /> % Recovery 90 80 90 102 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 90 8o 90 103 <br /> Relative% <br /> Difference 00 00 00 1 6 <br /> LCS Batch# 4LCS062599 4LCS062599 4LCS062599 4LCS052599 <br /> Date Prepared 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Date Analyzed 6/25/99 6/25/99 6/25/99 6/25/99 <br /> Instrument I D # HP 4 HP 4 HP 4 HP-4 <br /> LCS % <br /> Recovery 100 85 85 100 <br /> Recovery <br /> Control Limits 70-130 70-130 70-130 70-130 <br /> Please Note <br /> The LCS is a control sample of known intertereni 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 /> ,t fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> 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 /> anne Pegley <br /> Project Manager <br /> 9061562 GET <10> <br /> CXk <br />