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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(510)988 9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-8264/980609-J1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9806003-03 Reported .fun 25, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS061898MTBEF2A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst M Williams <br /> MS/MSD# 980681603 <br /> Sample Cone N D <br /> Prepared Date 6/18/98 <br /> Analyzed Date 6/18/98 <br /> Instrument I ❑ # F2 <br /> Cone Spiked 50Ng/L <br /> Result 51 <br /> [ MS % Recovery 102 <br /> Dup Result 47 <br /> MSD % Recov 94 <br /> RPD 82 <br /> RPD Limit 0-25 <br /> LCS # LCS062398 <br /> Prepared Date 6/22/98 <br /> Analyzed Date 6/23/98 <br /> Instrument I D # F2 <br /> -Cone Spiked 50ug/L <br /> LCS Result 46 <br /> LCS % Recov 92 <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 /> SEQU IA ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sarnple <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 /> gory <br /> o ect Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative Difference 9806003 BLA <7> <br />