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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 Sinker Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Blaine Tech Services, Inch AClient Project ID 940510-1-3, Shell, 4445 Pershing Ave v. <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> Attention Jim Keller QC Sample Group 4E67907 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- X Mirattab A.Miraftab A Miraftab A Miraftab <br /> MS/MSD <br /> Batch# 4E67705 4EM05 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 Ng/L 10 pg/L 10 pg/L 30 pg/L <br /> . <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 /> QUQIA 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 4E67901 Bi_A <5> <br /> m <br />