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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX (415) 364 9233 <br /> ,!Z� 1900 Bates Avenue Sat 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 YYY V�� " Client Project ID .v 940816-Z1, Chevron, S221-5 Y <br /> 985 Timothy Drive Matrix Liquid ry <br /> San Jose, CA 95133 <br /> ,Attention Jim Keller OC Sample Group 94081391 01-03 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 /> Anal st: R Vincent R Vincent R Vincent R Vincent <br /> MS/MSD <br /> Batch# 940898204 940898204 940898204 940898204 <br /> Date Prepared: N A. N A N A- N A. <br /> Date Analyzed. 8/22/94 8/22/94 8/22/94 8/22/94 <br /> Instrument I D #. GCHP-7 GCHP 7 GCHP-7 GCHP-7 <br /> Conic Spiked- 10ug/L 10Ng/L 10ug/L 30ug/L <br /> Matrix Spike <br /> % Recovery: so 89 87 90 <br /> Matrix Spike <br /> Duplicate % <br /> Recovery, 96 94 94 97 <br /> Relative% <br /> Difference 6 5 55 77 7 5 <br /> LCS Batch# - - - <br /> Date Prepared: - - - - <br /> Date Analyzed: - - - <br /> Instrument I D #. - - <br /> LCS % <br /> Recovery. - - - - <br /> % Recovery <br /> Control Limits: 71-133 72128 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 NALYTICCAL 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 /> Suza a hin <br /> Project Manager 9408891 SLA 411> <br />