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680 Chesapeake Drive Redwood Gty, CA 94063 (650) 364 9G00 FAX(650)364 9233 <br /> Sequoia <br /> 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 /> ,}ryr <br /> ;lGet#ler Ryan%Geostrategles -Client Project ID Chevron 9-1848, Manteca <br /> 3164 Gold Camp Drive, #240 Matrix Liquid <br /> Rancho Cordova, CA 95670 Reported Sep 11, 1997 <br /> vAttention Greg Gurss Work Order# 97QSG33-49-12 v h p u v, h. <br /> ♦♦ ry yr `}♦ r r v v♦ r . n + n ry yr nj v `� r} r r <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Satch# MS090597MTBEH6A <br /> [An,aly. Method. EPA 8260 <br /> Pep Method N A <br /> Analyst M Williams <br /> MS/MSD # 9708G4502 <br /> Sample Cone.- N D <br /> Prepared Date 9/5/97 <br /> Analyzed Date- 9/5/97 <br /> Instrument I D #: H6 <br /> Conc Spiked 50 pg/L <br /> Result. 47 <br /> 4VS % Recovery 94 <br /> Dup Result. 49 <br /> MSD % Recov 98 <br /> RPD. 42 <br /> RAD Limit 0-25 <br /> LCS # BLK090697 <br /> Prepared Date 9/6/97 <br /> Analyzed Date' 9/6/97 <br /> Instrument I D # H6 <br /> Cone Spiked 50 po/L <br /> LCS Result 46 <br /> LCS %Recov 92 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known,lnterferent-free matrix that is analyzed using the same reagents, <br /> EQUOIA A A YTICAL 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 /> 4ctegory **MS=Matrix Spike, MSD=MSDuphcate,RPD=Relative%Di ference9708G33 GET <5> <br /> anager <br />