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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510) 988 9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> Envlios Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Liquid <br /> Sonoma, CA 95476 <br /> Attention Joe Neely Work Order# 9704512 10 Reported Apr 22, 1997 <br /> ,v <br /> QUALITY CONTROL DATA REPORT <br /> Analyte TRPH <br /> OC Batch# CP0406975520EXA <br /> Analy. Method SM 5520BF <br /> Prep Method: EPA 3510 <br /> Analyst: J Aquino <br /> MS/MSD#' BLK040897 <br /> Sample Conc N D <br /> Prepared Date: 4/8/97 <br /> Analyzed Date 4/9/97 <br /> instrument 11.13 #. MANUAL <br /> Conc Spiked. 10 mg/L <br /> Result* 78 <br /> MS % Recovery 78 <br /> Dup Result 78 <br /> MSD % Recov 78 <br /> RPD 00 <br /> RPD Limit. 0-50 <br /> LCS# 13LK041197 <br /> Prepared Date 4/11/97 <br /> Analyzed Date 4/14/97 <br /> Instrument I D #• MANUAL <br /> Conc Spiked 10 mg/L <br /> LCS Result 79 <br /> LCS %Recov 79 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,interferent-tree matrix that is analyzed using the same reagents, <br /> SEQUOIA AN LYTICAL 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 /> I ®re(gory <br /> Project Manager **MS=Matnx Spike, MSD=MS Duplicate,RPD=Relative%Difference 9704512 EEE ¢15> <br />