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• y 0 S� <br /> 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 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> RESNA Client Project ID 150077 01, Holt Brothers <br /> 1710 Main Street Matrix Liquid <br /> Escalon, CA 95320 <br /> Attention John Lane OC Sample Group 41733804 Reported Jun 22, 1994 <br /> (QUALITY CONTROL DATA REPORT <br /> ANALYTE 1,1-Dichloro- Tnchloro- Chloro- <br /> ethane ethane benzene <br /> Method. EPA 8010 EPA 8010 EPA 8010 <br /> Analyst: H Porter H Porter H Porter <br /> MS/MSD <br /> Batch# 4F21705 41721705 4F21705 <br /> Date Prepared 6/9/94 6/9/94 6/9/94 <br /> Date Analyzed 6/9/94 6/9/94 6/9/94 <br /> Instrument I ❑ # GCHP-9 GCHP-9 GCHP-9 <br /> Conc Spiked 25 ug/L 25 lig/L 25 Ng/L <br /> Matrix Spike <br /> % Recovery 108 104 104 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery* 104 100 100 <br /> Relative% <br /> Difference. 38 3 9 39 <br /> LCS Batch# - - - <br /> Date Prepared - <br /> Date Analyzed - <br /> Instrument I D # <br /> LCS % <br /> Recovery - - <br /> % ecovery <br /> Control Limits 28-167 35-146 38-150 <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 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 /> Vickie Tague Clark <br /> Project Manager 4F33801 WAT e-8> <br />