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® Sequoia <br /> 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> �7411 404 N Wiget Lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> Analytical 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> • <br /> Cambria Environmental Tech Client Project ID Shell 1071 N Main Manteca <br /> 114465th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803J61 01, 03, 04 Reported Apr 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MSO40198MTBEEXA <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst: M Williams <br /> MS/MSD#: 9803JS701 <br /> Sample Conc : N D <br /> Prepared Date 4/1/98 <br /> Analyzed Date 4/1/98 <br /> Instrument I D # Hs <br /> Conc Spiked 2500 pg/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: 2500ug/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 /> EQVOIA 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 Herlin <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9803J61 CCG <4> <br />