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1 � r <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wlget Lane Walnut Creek.CA 94598 (925)9a8-9600 FAX(925)988-9673 <br /> Big Striker Avenue,Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Sler-l�yan - Dublin Client project it) Unocal Circle K SS#1205, Lathrop <br /> 6747 Sierra Court, Suite J Matrix Liquid <br /> ' Dublin, CA 94568 <br /> Attention Deanna Harding CSC Sample Group 9011723-727 Reported Feb 9, 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 C Westwater C Westwater C Westwater C Westwater <br /> MS/MSD <br /> Batch# 9011481 9011481 9011481 9011481 <br /> Date Prepared 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Date Analyzed 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Instrument 1 D # HP 9 HP-9 HP-9 HP-9 <br /> Conc Spiked 20 yg/L 20 jig/L 20 jig/L 60 pg/L <br /> Matrix Spike <br /> % Recovery 105 105 105 105 <br /> • Matrix Spike <br /> Duplicate % <br /> Recovery 100 100 100 103 <br /> Relative % <br /> Difference 49 49 49 1 6 <br /> LCS Batch#. 9LCS020299 9LCS020299 91-05020299 9LCS020299 <br /> Date Prepared 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Date Analyzed 2/2/99 2/2/99 2/2/99 2/2/99 <br /> Instrument I D # HP-9 HP-9 HP-9 HP-9 <br /> LCS % <br /> Recovery 100 105 100 105 <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,interferent free matrix that is analyzed using the same reagentst <br /> tianne <br /> UOTA ANALYTICAL, #1271 preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> 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 recoveryIs to be used to validate the batch <br /> Fegley <br /> Project Manager <br /> 9011723 GET <2> <br />