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Q Sequoia 680 Chesapeake Dnve 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 /> Analytical 819 Stnker Avenue Suite B Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID 940510-Ki,Shell, 620 W Charter Way <br /> 985 Timothy Drive Matrix Liquid <br /> San.lose, CA 95133 <br /> Attention Jim Keller QC Sample Group 4E74809 Reported 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# 4E74806 4E74806 4E74806 4E74806 <br /> Date Prepared - <br /> Date Analyzed 5/16/94 5/16/94 5/16/94 5/16/94 <br /> instrument I D.#. GCHP-2 GCHP-2 GCHP-2 GCHP 2 <br /> Conc. Spiked, long/L 10pg/L long/L 30us/L <br /> . Matrix Spike <br /> % Recovery 92 92 93 93 <br /> Matrix Spike <br /> Duplicate <br /> Recovery 97 9a 97 <br /> Relative % <br /> Difference 53 43 52 42 <br /> LCS Batch#• - - - <br /> Date Prepared <br /> Date Analyzed - <br /> Instrument 1.13 #, <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 /> *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 /> Project Manager aE7aso1 sLA <6> <br />