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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(5t0) 988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX(916)921 0100 <br /> �rill� <br /> i <br /> Pacific Environmental Group Client Project ID 310-097 1B, Tracy <br /> 2025 Gateway Place, Suite 440 Matrix LIQUID <br /> San Jose, CA 95110 <br /> Attention Joe Muzzio Work Order# 9701516 01, 02 Reported Jan 20, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Lead <br /> QC Batch# ME0114977000MDA <br /> Analy Method EPA 239 2 <br /> Prep Method EPA3020 <br /> Analyst J Jencks <br /> MS/MSD # 970149402 <br /> Sample Conc N D <br /> Prepared Date 1/14/97 <br /> Analyzed Date 1/16/97 <br /> Instrument I D # MTJA3 <br /> Conc Spiked 50pg/L <br /> Result 43 <br /> MS %Recovery 86 <br /> Dup Result 42 <br /> MSD %Recov 84 <br /> RPD 24 <br /> RPD Limit 0-30 <br /> LCS # BLK01149713S <br /> Prepared Date 1/14/97 <br /> Analyzed Date 1/16/97 <br /> Instrument I.D # MTJA3 <br /> Conc Spiked 50lrg/L <br /> LCS Result 46 <br /> LCS % Recov 92 <br /> 75-125 <br /> LCS 80-120 <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 /> Tod Granicher <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate,RPD=Relative%Difference 9701516 PPP <4> <br />