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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 (9Z5)988-%00 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 /> is <br /> Blaine Tech Services, Inc Client Project ID Chevron 9-4275/ 980624-J1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thle Work Order # 9806G68-03-06, 08-10 Reported Jul 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS070198MT13EH6A <br /> Analy. Method EPA 8260 <br /> Prep. Method N A. <br /> Analyst L Duong <br /> MS/MSD # 980606807 <br /> Sample Cone 44 <br /> Prepared Date N A <br /> Analyzed Date 7/1/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 mg/L <br /> Result 51 <br /> MS % Recovery 93 <br /> Dup Result 52 <br /> MSD % Recov 95 <br /> RPD 19 <br /> RPD Limit 0-25 <br /> LCS # LC8070198 <br /> Prepared Date 7/1/98 <br /> Analyzed Date 7/1/98 <br /> Instrument I D.# H6 <br /> Cone Spiked 50,ug/L <br /> LCS Result 47 <br /> LCS % Recov 94 <br /> 60-140 <br /> LCS 70-180 <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 /> �SEQUOI NALYTICAL 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 fail within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Ory <br /> r onager **MS=Matrix Spike, MSD=M5 Duplicate, RPD=Relative 9e Difference 9806G68$LA <2> <br />