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Sequoia 6so Chesapeake Drive Redwood CityCA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N Wlget 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 /> Iwo Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Westrec Prop /Kir 62514 0001 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Jeanne Hornsey Work Order# 9806G74-06 Reported Jul 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS063098MTBEH6A <br /> Analy. Method EPA 8260 <br /> Prep Method NX <br /> Analyst: S Goldstein <br /> MS/MSD#: 9806GO310 <br /> Sample Conc : 12 <br /> Prepared Date N/A <br /> Analyzed Date 6/30/98 <br /> Instrument LD # H6 <br /> Conc. Spiked 50ltg/L <br /> Result: 53 <br />• MS % Recovery: 82 <br /> Dup. Result- 55 <br /> MSD % Recov 86 <br /> RPD 37 <br /> RPD Limit 0-25 <br /> LCS #: LCS063098 <br /> Prepared Date N/A <br /> Analyzed Date 6/30/98 <br /> Instrument LD # H6 <br /> Conc Spiked 50 jug/L <br /> LCS Result. 49 <br /> LCS % Recov.. as <br /> x0-140 <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 /> ''a, 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 /> ct <br /> ana <br /> interference,the LCS recovery is to be used to validate the batch <br /> an Ki j <br /> eleger '"*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9806G74 AAA <2> <br />