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r` <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9133 <br /> Sequoia 404 N Wiget Lane Wainut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> D' o,a .,, v; ,"'T"- :U A, w --,{ � ,- <br /> nCtien Project IS UnocaSS#0123fkyer-Ryan= ublin { <br />{6747 Sierra Court, Suite J Matrix Liquid <br /> Dublin, CA 94568 <br /> ,Attention Deanna Harding QC Sample Group 8121234-240 Reported Dec 31, 1998'A <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#: 8121169 8121169 8121169 8121169 <br /> Date Prepared: 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Date Analyzed 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Instrument I D.#: HP-4 HP-4 HP4 HP-4 <br /> Conc Spiked 20 pg/L 20Yg/L 20 ug/L 60 jug/L <br /> Matrix Spike <br /> % Recovery 100 90 90 105 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 100 90 95 107 <br /> Relative% <br /> Difference. 0 0 00 54 1 6 <br /> LCS Batch#. 4LCS121798 4LCS121798 4LCS121798 4LCS121798 <br /> Date Prepared 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Date Analyzed: 12/17/98 12/17/98 12/17/98 12/17/98 <br /> Instrument I D # HP-4 HP-4 HP-4 HP-4 <br /> LCS % <br /> Recovery 95 85 90 102 <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 reagents, <br /> SEQUOIA 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 recovery is to be used to validate the batch <br /> 1u1"tanne*F`=gley'A* <br /> Project Manager <br /> 8121234 GET <17> <br />