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41 <br /> Q Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> AW Analytical 819 Striker Avenue SULte 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 0 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 Homsey Work Order# 9806G74 -02, 05 Reported Jul 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS062998MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method INA <br /> Analyst L Zhu <br /> MS/MSD# 9806D2210 <br /> Sample Cone 130 <br /> Prepared Date 6/29/98 <br /> Analyzed Date 6/29/98 <br /> Instrument LD # H6 <br /> Cone Spiked. 50ug/L <br /> Result. 190 <br /> MS % Recovery 120 <br /> Dup Result. 180 <br /> MSD % Recov.. 100 <br /> RPD 54 <br /> RPD Limit 0-25 <br /> I <br /> LCS# LCS062998 <br /> Prepared Date 6/29/98 <br /> Analyzed Date 6/29/98 <br /> Instrument LD # H6 <br /> Cone Spiked 50 pg/L <br /> LCS Result 52 <br /> LCS% Recov.. 104 <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 /> interference,the LCS recovery is to be used to validate the batch <br /> Kim <br /> rolect Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 98061374 AAA <1 a <br />