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Sequoia 680 Chesapeake Dnve Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> Analytical 1900 Bates Avenue Suite L Concord CA 94520 (510) 686 9600 FAX(510) 686 9689 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> RESNA Cllent Project I D 150077 01, Holt Brothers <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 4F33802 Reported Jun 22, 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. J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch# 4F33301 4F33301 4F=01 4F33301 <br /> Date Prepared - - - - <br /> Date Analyzed 6/9/94 6/9/94 6/9/94 6/9/94 <br /> Instrument 1.13 #. GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Conc Spiked- 10Ng/L topg/L 10pg/L 30Ng/L <br /> Matrix Spike <br /> 0 % Recovery. 100 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery. 100 110 110 110 <br /> Relative % <br /> Difference 00 9 5 95 66 <br /> LCS Batch#- - - <br /> Date Prepared: - - - <br /> Date Analyzed: - - - <br /> Instrument LD #- - - - <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 1s 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 /> IY1 1 L l/l/WL-^ interference,the LCS recovery Is to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 4F33801 wAT <10> <br />