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' 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N W1get lane Walnut Creek CA 94598 (925)988-9600 FAX(9Z5)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# 9809E49-02-04 Reported Oct 15, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> ' OC Batch# MS092998MT13EH6A <br /> Analy Method EPA 8260 <br /> Prep. Method- N A. <br /> Analyst B Pitamah <br /> MS/MSD # 9809E9404 <br /> ' Sample Conic N D <br /> Prepared Date 9/29/98 <br /> Analyzed Date 9/29/98 <br /> Instrument I D # H6 <br /> ' Conc Spiked 50jug/L <br /> Result 47 <br /> MS -/. Recovery, 94 <br /> Dup Result 47 <br /> MSD % Recov . 94 <br /> IRPD- 00 <br /> RPD Limd 0-25 <br /> LCS# LCS092998 <br /> ' Prepared Date 9/29/98 <br /> Analyzed Date" 9/29/98 <br /> Instrument I D# H6 <br /> ' Conc. Spiked 50ug/L <br /> LCS Result 45 <br /> ' LCS% Recov 90 <br /> 60-140 <br /> ' LCS 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 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 /> m <br /> interference,the LCS recovery Is to be used to validate the batch <br /> i <br /> roject ager **MS=Matrix Spike, MSO=MS Duplicate,RPD=Relative%Difference 9809E49 AAA .42> <br /> 1 <br />