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Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek,CA 94598 (510)988-9600 FAX(510)988-9673 <br /> AnalT��. �� 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> Y l 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)791-1865 FAX(707)792-0342 <br /> Cambria Environmental Tech Client Project ID Shell 1071 N Main Manteca <br /> 1144 65th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Paul Waite Work Order# 9803J59 01 Reported Apr 13, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO40198MTBEEXA <br /> Analy Method EPA 8260 <br /> Prep Method: <br /> Analyst M Williams <br /> MS/MSD# 9803,.15701 <br /> Sample Cone N D <br /> Prepared Date 4/1/98 <br /> Analyzed Date 4/1/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500ug/Kg <br /> Result: 2000 <br /> •MS %Recovery 8o <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 /> Cone 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 H <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,MSR=MS Duplicate, RPD=Relative%Difference 98=59 CCC <2> <br />