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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(4t5) 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 Client Project ID 15007701, Halt Brothers <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane QC Sample Group 4F33801, 3, 4 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 9020 <br /> Analyst: J Minkel J Minkel J Minkel J Minkel <br /> MS/MSD <br /> Batch#: 4F39112 4F39112 4F39112 4F39112 <br /> Date Prepared. - - - - <br /> Date Analyzed 6/8/94 6/8/94 6/8/94 6/8/94 <br /> Instrument I D # GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Conic Spiked: long/L 10pg/L 10Ng/L 30pg/L <br /> Matrix Spike <br /> % Recovery* 110 100 100 103 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 99 98 100 100 <br /> Relative% <br /> Difference. 11 2 0 0 0 30 <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 is an aliquot of sample <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure k <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 /> Vickie Tague Clark <br /> Project Manager 41733801 WAT 49> <br />