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f <br /> Sequoia <br /> � � 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (925)988-96CO FAX(925)988-9673 <br /> Anlal7t� 819 Striker Avenue Suite 8 Sacramento CA 95834 (916 )921 -9600 FAX(916)921-0100 <br /> Jl 14SS McDowell Blvd North Ste D Petaluma,CA 94954 707 792-1865 FAA 707 792-0342 <br /> 98lai'ne Tech Services, Inc Client Project ID $hell 1071 N Main St <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9807H85-05 Reported Aug 19, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte: MTBE <br /> OC Batch# M8080698MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst: M Williams <br /> MS/MSD# 9807DO901 <br /> Sample Cone N D <br /> Prepared Date 8/6/98 <br /> Analyzed Date 8/6/98 <br /> Instrument I D #- H6 <br /> Cone Spiked: 50,ug/L <br /> Result 59 <br /> MS % Recovery 118 <br /> Dup Result 63 <br /> MSD% Recov : 126 <br /> RPD 66 <br /> RPD Limit 0-25 <br /> LCS#- LCS080598 <br /> Prepared Date 8/5/98 <br /> Analyzed Date 8/5/98 <br /> Instrument I.D # H6 <br /> Cone Spiked. 50,ug/L <br /> LCS Result: 55 <br /> LCS% Recov 110 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> r The LCS is a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> SEO ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> �1 fortified with known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matnx spike does not fall within specified control limits due to matrix <br /> P ggy Penner interference,the LCS recovery Is to be used to validate the batch <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9807HS5 8LA a2> <br />