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' 680 Chesapeake Drive Redwood City CA 94063 <br /> Sequoia (650) 364-9600 FAX(650)364-9233 <br /> 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 /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Analytical <br />' ATC Associates, Inc Client Project ID Ripon USD 13099 0001 <br /> 1117 Lone Palm Avenue Matrix Liquid <br />' Modesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9901 E93 -01 Reported Feb 22, 1999 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br />' QC Batch# MS020399826082A <br /> Analy Method EPA 8260 <br />' Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD # 9020208 <br />' Sample Conc ND <br /> Prepared Date 2/3/99 <br /> Analyzed Date 2/3/99 <br /> Instrument I D # GCMS2 <br />' Conc Spiked 50pg/L <br /> Result 55 <br /> PMS % Recovery 110 <br /> Dup Result 57 <br /> MSD % Recov 114 <br />' RPD 36 <br /> RPD Limit 025 <br /> LCS # LCS020399 <br />' Prepared Date 2/3/99 <br /> Analyzed Date 2/3/99 <br /> Instrument I D # GCMS2 <br />' Conc Spiked 50,ug/L <br /> LCS Result 54 <br /> 1 LCS % Recov 108 <br /> 60-140 <br /> LCS 70130 <br /> Control Limits <br />' Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents <br /> lap #1271 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 /> Kayv ya <br />' ProI ct Mana er **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9901 E93 AAA <1> <br />