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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 Stnker Avenue,Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Enviros' Client Project ID Shell 1267 Country Club, Stick <br /> 270 Perkins Ave Matrix Solid <br /> Sonoma, CA 95476 <br /> Attention .Joe Neely Work Order# 9704512 02-08. 14 Reported Apr 22, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Diesel <br /> QC Batch# GC0411970HBPEXA <br /> Analy Method: EPA 8015M <br /> Prep. Method EPA 3550/DHS <br /> Analyst: B Sullivan <br /> MS/MSD # 97451202 <br /> Sample Conc 20 <br /> Prepared Date: 4/11/97 <br /> Analyzed Date. 4/12/97 <br /> Instrument I D #. GCHP413 <br /> Conc Spiked 25 mg/Kg <br /> Result: 39 <br /> MS % Recovery 76 <br /> Dup Result. 47 <br /> MSD % Recov 108 <br /> RPD: 19 <br /> RPD Limit, 0-50 <br /> LCS # BLK041197S <br /> Prepared Date 4/11/97 <br /> Analyzed Date. 4/12/97 <br /> Instrument I D #: GCHP4B <br /> Conc Spiced 25 mg/kg <br /> LCS Result 28 <br /> LCS % Recov 112 <br /> 50-150 <br /> LCS 60-140 <br /> Control Limits <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 /> regory <br /> Project Manager **MS-Matrix Spike,MSD=MS Duplicate, RPD=Relatwe% Difference 9704512 EEE <2> <br />