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Sequoia 680 Chesapeake Drive 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 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> RESNA Client Project ID 152102 02, Tri Valley Growers <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention Bill Channell OC Sample Group 4FE6101 -05 Reported Jul 7, 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# 4FDO503 4FDO503 4FDO503 4FDO503 <br /> Date Prepared NA NA NA NA <br /> Date Analyzed 6/28/94 6/28/94 6/28/94 6/28/94 <br /> Instrument 1 D # GCHP-3 GCHP-3 GCHP-3 GCHP-3 <br /> Conc Spiked 10pg/L 10pg/L 10ttg/L 30pg/L <br /> Matrix Spike <br /> % Recovery 110 120 110 113 <br /> • <br /> Matrix Spike <br /> Duplicate% <br /> Recovery 110 110 110 107 <br /> Relative % <br /> Difference 00 87 00 55 <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 tree matrix that is analyzed using the same reagents <br /> efEQUOIA 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 /> U �VVV the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> Interference,the LCS recovery 1s to be used to validate the batch <br /> Vickie Tague Clark <br /> Project Manager 4FE6101 WAT <2> <br />