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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> 1900 Bates Avcnue Suite L Concord CA 94520 (510) 686 9600 FAX(51o)686 9689 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 911 9600 FAX(916) 921 0100 <br /> Blaine Tech Services, Inc Client Project ID 940510-K1, Shell, 620 W Charter Way <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 4E74803, 05, 08 Deported May 23, 1994 <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# 4E748o1 4E74801 4E74801 4E74801 <br /> Date Prepared. - - <br /> Date Analyzed: 5/16/94 5/16/94 5/16/94 5/16/94 <br /> Instrument I D.#* GCHP-17 GCHP-17 GCHP 17 GCHP-17 <br /> Conc. Spiked: 10pg/L 10yg/L 10pg/L 30 u9/L <br /> Matrix Spike <br /> % Recovery: 99 99 100 1 Da <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 99 100 '00 <br /> Relative% <br /> Difference 00 00 00 0 0 <br /> LCS Batch# - <br /> Date Prepared. <br /> Date Analyzed <br /> Instrument I D #: <br /> LCS % <br /> Recovery - - - <br /> Recovery <br /> FControl 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 /> SEQUOIA 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 /> P4E74801 8LA �5> <br /> Project Manager <br />