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680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N \Mget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Sinker 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 Servlces, Inc Client Protect ID Shell 6131 Pacific Ave <br /> 1680 Rogers Ave Matrix Liquid <br /> San Jose, CA_95112 <br /> Attention Fran Thie Work Order# 9807H83-02-03, -07, 9807H84-10 Reported Aug 24, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> ---- QC Batch# M5080198MTBEli6A --- --- --��----- � — �-- - LL---- - - ------- -�— � —-- - - <br /> Analy Method EPA 6260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSO # 98071-18706 <br /> Sample Conc N D <br /> Prepared Date 8/1/98 <br /> Analyzed Date 8/1/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50pg/L <br /> Result 49 <br /> MS % Recovery 98 <br /> Dup Result 49 <br /> MSD % Recov 98 <br /> RPD 00 <br /> —RPD Limit 0-25 <br /> - ----LCS# -�BLK080198 -- -- — --= - -_— --- - - ---- - - - - - - <br /> Prepared Date 8/1/98 <br /> Analyzed Date 8/1/98 <br /> Instrument I D # H6 <br /> Conc Spiked 50 ug/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-tree matrix that is analyzed using the same reagents, <br /> SEQU ANALYTICAL preparation,and analytical methods employed for the samples The matrix spike is an aliquot of sampl <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matrix <br /> interference,the LGS recovery is to be used to validate the batch <br /> -PeV <br /> liner <br /> Pranagen / **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 98071-183 BLA <3> <br />