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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 /> 6) <br /> Analytical 819 Stnker Avenue,Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> Blaine Tech Services, Inc 011ent'Prolect ID l Shell Stockton/971117-Mi+ f <br /> =1680 Rogers Ave Matrix Liquid <br /> 'San.lose, CA 95112 <br /> ;Attention Fran Thie Work Order# 9711 F35-01-08, 9711 F37-12 Reported Dec 16, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> GC Batch# MS120197MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep. Method N A <br /> Analyst L Duong <br /> MS/MSD # 9711A7705 <br /> Sample Conc • N D <br /> Prepared Date 12/1/97 <br /> Analyzed Date 12/1/97 <br /> Instrument I D # H6 <br /> Conc Spiked 50p9/L <br /> Result 52 <br /> MS % Recovery 104 <br /> Dup Result 55 <br /> MSD % Recov 110 <br /> RPD 56 <br /> RPD-l=imit 0-25 <br /> LIDS # LCS120197 <br /> Prepared Date- 12/1/97 <br /> Analyzed Date 12/1/97 <br /> Instrument I D # H6 <br /> Conc. Spiked 50pg/L <br /> LCS Result 49 <br /> LCS % Recov 98 <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 ANALYTI AL 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 /> Peggy Penner <br /> Protect Maria er "� MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 97111=35 Bl_A <3> <br />