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q nit � <br /> 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 /> Analytical 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 /> ATC Associates, Inc Client Project ID Thierriann's Service 62605 0001 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 9535 1-1 502 <br /> ,Attention Jeanne Homsey Work Order# 9807440-01-06 Reported Jul 17, 1998 <br /> t - <br /> t <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS071098MTBEH6B <br /> Analy. Method EPA 8260 <br /> Prep Method NA <br /> Analyst S Goldstein <br /> MS/MSD# 980744006 <br /> Sample Cone N D <br /> Prepared Date: 7/10/98 <br /> Analyzed Date- 7/10/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 frg/L <br /> Result 42 <br /> MS % Recovery 84 <br />• Dup Result 50 <br /> MSD %Recov 100 <br /> RPD* 17 <br /> RPD Limit 0-25 <br /> LCS # LC8071098 <br /> Prepared Date 7/10/98 <br /> Analyzed Date 7/10/98 <br /> Instrument I D.# H6 <br /> Cone Spiked: 50pg/L <br /> LCS Result 49 <br /> LCS % Recov 98 <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 /> Ka interference,the LCS recovery is to be used to validate the batch <br /> n Klmy <br /> Project Ma ager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9807440 AAA <2> <br />