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Sequoia 680 Chesapeake Drive Redwood C,ty,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 /> Analytical at9 Striker Avenue,Suite 9 Sacramento CA 95834 (916) 921-9600 FAX(916)921 0100 <br /> ,4 n • . .vx r fin. s . 4.v •sr , s tr. Nvt rvk . y <br /> Gettler'Ryan/Geostrategies Client Project ID N Former Unocal 2859,280054 85 v. <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> Dublin, CA 94568 <br /> Attention Deanna Harding Work Order# 9803391-07-10 x Reported Mar 17, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS031098MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst E Manuel <br /> MS/MSD # 980339107 <br /> Sample Conc N D <br /> Prepared Date 3/10/98 <br /> Analyzed Date 3/10/98 <br /> Instrument I D # F3 <br /> Conc Spiked 50ug/L <br /> Result 42 <br /> MS % Recovery 84 <br /> 0 Dup Result 43 <br /> MSD % Recov 86 <br /> RPD 24 <br /> RPD Limit 0-25 <br /> LCS # LCS031098 <br /> Prepared Date 3/10/98 <br /> Analyzed Date 3/10/98 <br /> instrument 1 D #' F3 <br /> Conc Spiked Sous/L <br /> LCS Result 43 <br /> LCS % Recov 86 <br /> 50-140 <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 reagent3, <br /> Vregory- 99ory <br /> QUOIA 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 It <br /> the recovery of analytes from the matrix spike does not fall within specified control limits due to matnA <br /> Interference,the LCS recovery is to be used to validate the batch <br /> roject Manager *"MS.=Matrix Spike,MSD=MS Duplicate, RPI)=Relative%Difference 9803390 GET <97 <br />