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Sequoia 680 Chesapeake Dave 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 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> i <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 Jim Keller OC Sample Group 4E73909 Reported May 23, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Benzene Toluene Ethyl xylenes <br /> Benzene <br /> Method: EPA 8020 EPA 6020 EPA 8020 EPA 8020 <br /> Analyst: A Miraftab A.Miraftab A Muattab A Miraftab <br /> MS/MSD <br /> Batch# 4E69104 4E69104 4E69104 4E69104 <br /> Date Prepared. - - - - <br /> Date Analyzed- 5/14/94 5/14/94 5/14/94 5/14/94 <br /> Instrument I D # GCHP-3 GCHP-3 GGHP-3 GCHP-3 <br /> Conc Spiked: 10ug/L 10ug/L 10lig/L 30ug/L <br /> Matrix Spike <br /> % Recovery 91 91 92 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 92 91 92 93 <br /> Relative% <br /> Difference 1 1 00 00 33 <br /> LCS Batch# - - <br /> Date Prepared <br /> Date Analyzed <br /> Instrument I D # - <br /> LCS % <br /> Recovery - - <br /> ecovery <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 /> �EOUOIA 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 <7> <br />