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ID Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1900 Bates Avenue,Sint,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 /> Blaine Tech Services, Inc N> Client Project ID 940816-Z7, Chevron, S221-5 <br /> 985 Timothy Drive Matrix Liquid <br /> San Jose, CA 95133 <br /> t Attention Jim Keller QC Sample Group 9408691 -04 Reported Aug 24, 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. R Vincent R Vincent R Vincent R Vincent <br /> MS/MSD <br /> Batch# 9408A1404 940BA1404 9408A1404 940BA1404 <br /> Date Prepared N A. N A N A. N A <br /> Date Analyzed 8/23/94 8/23/94 8/23/94 8/23/94 <br /> Instrument I D # GCHP-20 GCHP-20 GCHP-20 GCHP 20 <br /> Conc Spiked 10Ng/L 10ug/L 10ug/L 30 frg/L <br />. Matrix Spike <br /> % Recovery 83 84 85 83 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery. 93 94 96 97 <br /> Relative % <br /> Difference 11 11 12 16 <br /> ` n ♦ S <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 ANA!_YTICAL 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 /> e hin <br /> Project Manager 9408891 BLA ¢2> <br />