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e - <br /> Sequoia 404 N Wlget Lane Walnut Creek CA 94598 Sacramento 9Z1-0100 <br /> 7ento CA 95834 (916)921-9600 FAX(916) <br /> 819 Striker Avenue Suite 8 792-1865 FAX(707)792-0342 <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (70 } <br /> deria Environmental Tech Client Project ID Shell 420 W Kettleman Lane <br /> 114465th St , Ste C Matrix Solid <br /> Oakland, CA 94608 Reported Nov 18, 1998 <br /> Attention Aubrey Coal Work Order # 9811146-OS <br /> QUALITY CONTROL DATA REPORT <br /> FAn <br /> Analyte 1v1TBE <br /> QC Batch# MS110498MTBEEXA <br /> aly Method EPA 8260 <br /> rep Method N A <br /> Analyst M Williams <br /> MS/MSD # 981OG9226 <br /> Sample Cone N D <br /> Prepared Date 11/4/9$ <br /> Analyzed Date 11/4/98 <br /> Instrument I D # H6 <br /> Cone Spiked 2500)ug/Kg <br /> Result 2000 <br /> MS % Recovery 80 <br /> Dup Result 2000 <br /> WD % Recov 80 <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCS110598 <br /> Prepared Date 11/5/98 <br /> Analyzed Date 11/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 2500 pg/K9 <br /> LCS Result 2100 <br /> LCS % Recov 84 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> =thhe <br /> is a control sample of known,interferent-free matrix that is analyzed using the sam],eagents <br /> SEQUOIA NALYTICAL and analytical methods employed for the samples The matrix spike is an aliquot h known quantities of specific compounds and subjected to the entire analytical proof analytes from the matrix spike does not fallwithin specified control limits due to <br /> ,the LCS recovery Is to be used to validate the batch <br /> enner <br /> **MS=Matrix Spike,MSD=MS Duplicate RPD=Relatwe% Difference 9811146 CC <2> <br /> Project Manager <br />