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L <br /> 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)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Analytical 1455 McDowell Blvd !North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Blaine Tech Services, Inc Client Project ID Shell 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA 95112 <br /> Attention Fran Thie Work Order# 9811 H55-01 Reported Dec 14, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MS113098MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD# 9811AO002 <br /> Sample Conc N D <br /> Prepared Date 11/30/98 <br /> Analyzed Date 11/30/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> Result 49 <br /> IVIS % Recovery 98 <br /> Dup Result 50 <br /> MSD % Recov 100 <br /> RPD 20 <br /> RPD Limit 0-25 <br /> LCS # LCS120198 <br /> Prepared Date 12/1/98 <br /> Analyzed Date 12/1/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> LCS Result 48 <br /> LCS % Recov 96 <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 /> E 4101 ANALYTICAL 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 fall within specified control limits due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> Peg Penner <br /> Pr ect Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9811H55 BLA <3> <br />