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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 /> 111W 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 /> is <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275/980326-G1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9803157-01, 9803158-10 Reported Apr 21, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO40198MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD# 980316415 <br /> Sample Cone N D <br /> Prepared Date 4/1/98 <br /> Analyzed Date 4/1/98 <br /> Instrument I D # F3 <br /> Cone Spiked- 50 jug/L <br /> Result 57 <br /> 5 % Recovery 114 i <br /> I <br /> Dup Result 56 <br /> MSD % Recov 112 <br /> RPD 18 <br /> RPD Limit 0-25 <br /> LCS # LC8040198 <br /> Prepared Date 4/11/98 <br /> Analyzed Date 4/11/98 <br /> Instrument I D # F3 <br /> Cone Spiked 501ig/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 /> DAtanager <br /> preparation,and analyticai 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> PPr **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803157 SLA <3> <br />