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a <br /> ti !:1) Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9640 FAX (415) 364 9233 <br /> 1900 Bales Avenue Smte L Concord CA 94520 (510) 686 9640 FAX (510)686 9684 <br /> Analytical 819 Sinker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID 940510-K2, Shell, 6131 Pacific Avenue <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller OC Sample Group 4E73201, 03-04 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- A.Miraftab A.Miraftab A Miraftab 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 GCHP-3 GCHP-3 <br /> Conic Spiked 10pg/L 10ug/L 1opg/L 30pg/L <br /> Matrix Spike <br /> 0 °% Recovery: 91 91 92 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 92 91 91 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 /> 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 1s to be used to validate the batch <br /> Suzanne Chin <br /> Project Manager 4E73201 BLA <2n <br /> i <br />