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Sequoia <br /> oia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> v L4 404 N Wlget lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9t6)921-0100 <br /> l 1 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> Cambria Environmental Tech Client Project ID Shell 1071 N Main, Manteca <br /> 114465th St, Ste C Matrrx Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803J55 01, 04 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO40198MT13EEKA <br /> Analy. Method. EPA 8260 <br /> Prep. Method. <br /> Analyst M Williams <br /> MS/MSD# 980SJ5701 <br /> Sample Conc N D <br /> Prepared Date 4/11/98 <br /> Analyzed Date 4/1/98 <br /> Instrument I.D.# H6 <br /> Conc Spiked 2500yg/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 11.13 # 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 /> SEQUOIA 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 /> Richard Herling <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9803J55 CCC <4> <br />