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` / ■ Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364-9233 <br /> 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510)686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)911 0100 <br /> Analytical <br /> Blaine Tech Services, Inc Client Project ID 940510-A2, Shell, 141 N EI Dorado <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jinn Keller OC Sample Group 4E73902, 05-06,08 Reported May 23, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Benzene Toluene Ethyl Xylenes <br /> Benzene <br /> Method EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst A Miraftab A Miraftab A Miraftab A Miraftab <br /> IDIS/MSD <br /> Batch# 4E67705 4E67705 4E67705 4E67705 <br /> Date Prepared - - - - <br /> Date Analyzed 5/15/94 5/15/94 5/15/94 5/15/94 <br /> Instrument I D # GCHP-2 GCHP 2 GCHP-2 GCHP-2 <br /> Conc Spiked 10,ug/L 10ug/L t0gg/L 30jug/L <br /> . Matrix Spike <br /> % Recovery 93 90 91 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery 93 88 89 90 <br /> Relative % <br /> Difference 00 22 22 00 <br /> LCS Batch#• - <br /> Date Prepared - <br /> Date Analyzed <br /> Instrument i D.# <br /> LCS % <br /> Recovery - - - <br /> % Recovery <br /> Control Limits 71-133 72-128 72 130 71 120 <br /> Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> 001.101A ANALYTICAL 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 /> Suzanne Chin <br /> Project Manager 4E73901 BLA <4> <br />