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Sequoia Ola 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> v 4 44 404 N Wiget Lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Anal �a7 819 Striker Avenue Suite 8 Sacramento,CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1 [.al 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)79Z-0342 <br /> Cambria Environmental Tech Client Project ID Shell Manteca <br /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803,157 01, 03, 05, 07, 09 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#- MSO40198MT13EExA <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD# 9803J5701 <br /> Sample Conic ND <br /> Prepared Date: 4/1/98 <br /> Analyzed Date: 4/1/98 <br /> Instrument I.D # H6 <br /> Conc Spiked 2500 ug/Kg <br /> Result 2000 <br /> .MS% Recovery 80 <br /> Dup Result: 2100 <br /> MSD% Recov: 84 <br /> RPD 49 <br /> RPD Limit 0-25 <br /> LCS#: LCSO40198 <br /> Prepared Date 4/1/98 <br /> Analyzed Date 4/1/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500 pg/Kg <br /> LCS Result 2500 <br /> LCS %Recov 100 <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 /> EQUOIA 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 /> Richard HerlinIgInterference,the LCS recovery is to be used to validate the batch <br /> Richard Heriing <br /> Project Manager "`*MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9803,157 CCC <4> <br />