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18 Chesapeake D',1111 Redwood Clty CA 94063 (650)364-9" FAX(654)�k <br /> 'JV:-gUU1a 404 N Wiget Lane Walnut Creek.CA 94598 (925)988-9600 FAX(925)9E <br /> 819 Striker Aves+ue Snite a Sacramento CA 95834 (916)921-9640 FAX(916)91 <br /> i...� na' � � 1455 McDoweSf Sind North Sre D Pecalu,na GR 94954 (707)792-f 865 FAX(707)39 <br /> Cambria Environmental Teen Client Project ID Shell 420 W Kettleman Lane <br /> 1144 65th St, Ste C Matrix Solid <br /> Oakland, CA 94608 <br /> Attention Aubrey Coal Work Order # 9811146-01-07, 09 Reported Nov 18, <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch#. MS110498MTBEEXA <br /> Analy Method. EPA 8260 <br /> Prep, Method. NA <br /> Analyst SM Williams <br /> MS/MSD # 981OG9226 <br /> Sample Conc N D <br /> Prepared Date 11/4/99 <br /> Analyzed Date 11/4/98 <br /> Instrument 1.D,# H6 <br /> Conc Spiked 2.500 pg/Kg <br /> Result 2000 <br /> MS % Recovery so <br /> Dup Result 2000 <br /> MSD % Recov so <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCS110598 <br /> Prepared Date- ' t1/5/sa <br /> Analyzed Date 11/6/98 <br /> Instrument LD #. H6 <br /> Conc Spiked 2500 pg/Kg <br /> LCS Result 2100 <br /> LCS% Recon 84 <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 /> WrojectpManagger <br /> fortified with known quantities of specific compounds and subjected to the entire analytical procedure It <br /> the recovery of analytes from the matrix spike does not fall within specified control iimrts due to matrix <br /> interference,the LCS recovery is to be used to validate the batch <br /> nner **MS=Matrix Spike, MSD=MS Duplicate,RPD=Fieiative % Difference 9811146 CCC <3> <br />