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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX(650)364-9233 <br /> Sequoia <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX (510) 988 %73 <br /> ID ID Analytical 819 Stnker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> ,,Blaine Tech Services, Inc Tent Project ID Shell Stockton / 971117-M1 <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9711 F35-09, 9711 F37-10-11 Reported Dec 16, 1997 r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120197MTBEF3A <br /> Analy. Method. EPA 8260 <br /> Prep. Method N A. <br /> Analyst: L.Zhu <br /> MS/MSD # 9711 F371 0 <br /> Sample Conc : 28 <br /> Prepared Date 12/1/97 <br /> Analyzed Date. 12/1/97 <br /> instrument I D #' F3 <br /> Conc Spiked 50pg/L <br /> Result: 52 <br /> MS % Recovery 98 <br /> Dup. Result 54 <br /> MSD % Recov ,' 102 <br /> RPD 38 <br /> RPD Limit 0-25 <br /> LCS# LCS120197 <br /> Prepared Date 12/1/97 <br /> Analyzed Date 12/1/97 <br /> Instrument 1134. F3 <br /> Conc.Spiked 50ug/L <br /> LCS Result 53 <br /> LCS % Recov.. 106 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS 1s a control sample of known,interferent-free matrix that is analyzed using the same reagents, <br /> A&SEQUOIA ANALYTI AL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> Zfortified 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 /> ppp��� - interference,the LCS recovery is to be used to validate the batch <br /> Peggy Penner <br /> Project Manag r **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative% Difference 9711F35 BLA <4> <br />