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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650) 364-9233 <br /> Sequoia <br /> -'V 404 N Wiger Fane Walnut Creek CA 94598 (925)988-%00 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> low Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 707 792 1865 FAX 7p 92_ <br /> ( ) ( 7}7 0342 <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 Thie Work Order# 9806G68 -01, 07 Reported Jul 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS063098MTBEH6B <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst S Goldstein <br /> MS/MSD # 9806GO310 <br /> Sample Conc 12 <br /> Prepared Date N A <br /> Analyzed Date 6/30/98 <br /> Instrument I D #* H6 <br /> Conc Spiked 50pg/L <br /> Result 53 <br /> MS % Recovery 82 <br /> Dup Result 55 <br /> MSD % Recov 86 <br /> RPD 37 <br /> RPD Limit 0-25 <br /> LCS # LCS070198 <br /> Prepared Date 7/1/98 <br /> Analyzed Date 7/1/98 <br /> Instrument I D # H6 <br /> Conc. Spiked 50 jig/L <br /> LCS Result 47 <br /> LCS % Recov 94 <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 /> LYTICAL preparation,and analytical methods employed for the samples The matrix spine 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 /> /Vegory <br /> interference,the LCS recovery is to be used to validate the batch <br /> r **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9806G68 BLA <1> <br /> 104, <br />