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' 680 Chesapeake Drive Redwood Clry CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Ripon Unified School <br /> 1260 Graphics Drive Matrix Liquid <br /> ' Modesto, CA 95351-1502 <br /> Attention Drew Van Allen Work Order# 9809E49-01 Reported Oct 15, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> ' OC Batch# MS092998MTBEH6A <br /> Analy. Method EPA 8260 <br /> ' Prep Method N A. <br /> Analyst B Pitamah <br /> MS/MSD # 9809E9404 <br /> ' Sample Conc N D <br /> Prepared Date. 9/29/98 <br /> ,Analyzed Date 9/29/98 <br /> Instrument I D # H6 <br /> ' Conc Spiked 50 fig/L <br /> Result 47 <br /> MS °k Recovery 94 <br /> Dup Result. 47 <br /> MSD %Recov 94 <br /> ' RPD 00 <br /> RPD Limit 0-25 <br /> 1 <br /> LCS # LCS093098 <br /> ' Prepared Date 9/30/98 <br /> Analyzed Date 9/30/98 <br /> Instrument I D # H6 <br /> ' Conc Spiked 50 pg/L <br /> LCS Result 48 <br /> ' LCS % Recov 96 <br /> 60-140 <br /> ' LCS 70-130 <br /> Control Limds <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 /> 1 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 /> K an Klmya <br /> Project M ger **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9809E49 AAA <3> <br />