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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (415) 364 9600 FAX(415) 364 9233 <br /> 1 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(50 988 9673 <br /> Analytical 819 Stnkcr Avenue Suite 8 Sacramento,CA 95834 (916) 921 9600 FAX(916) 921 0100 <br /> Envlros 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 /> QUALITY CONTROL DATA REPORT <br /> Analyte 1,1-Dichioro- Trichloro- Chloro- <br /> ethene ethene Benzene <br /> OC Batch# GC041597801008A GC041597801008A G0041597801008A <br /> Analy. Method EPA 8010 EPA 8010 EPA 8010 <br /> Prep Method EPA 5030 EPA 5030 EPA 5030 <br /> Analyst E Cunanan E Cunanan E Cunanan <br /> MS/MSD #: 970480801 970480801 970480801 <br /> Sample Conc . N D 37 N D <br /> Prepared Date 4/15/97 4/15/97 4/15/97 <br /> Analyzed Date 4/15/97 4/15/97 4/15/97 <br /> Instrument I D #. GCHP8 GCHP8 GCHP8 <br /> Conc Spiked 25ug/L 25ug/L 25,tg/L <br /> Dilution Factor 10 10 10 <br /> Result 250 280 240 <br /> 40 MS % Recovery 100 97 96 <br /> Dup Result 270 290 230 <br /> MSD % Recov 108 101 92 <br /> RPD 77 35 43 <br /> RPD Limit 0-25 0-25 0-25 <br /> LCS #' BLK0417978S BLK041797BS BLK041797BS <br /> Prepared Date. 4/17/97 4/17/97 4/17/97 <br /> Analyzed Date 4/17/97 4/17/97 4/17/97 <br /> Instrument I D # GCHP8 GCHP8 GCHP8 <br /> Conc Spiked 25 pg/L 25 pg/L 25 pg/L <br /> LCS Result 25 23 22 <br /> LCS % Recov 100 92 88 <br /> 60-140 60-140 60-140 <br /> LCS 65-135 70-130 70-130 <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 ALYTICAL� 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 /> 4regory � <br /> MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference <br /> Protect Manager <br /> 9704512 EEE <11> <br />