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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 fAX(650)364-9233 <br /> Sequoia 404 N Wigct t.ane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 00 fAX(916)921-0100 <br /> Analytical 14 striker Avenue Suite rt Sacramento 9 95834 (707)792-,865 FAX(707)792-0342 <br /> 3455 McDowell Blvd North Ste D Petaluma,C11 94954 ( ) <br /> ry v n v r.L n rv. ♦....r ry v J n t v t J v v s v i t ryw ` ` ^ v 1 t .^ ! <br /> Gettler Ryan/Geostrategles Client Project ID Unocal 0123, 280047 85 <br /> 6747 Sierra Court, Ste J Matrix Liquid <br /> .Dublin, CA 94568 Reported Aug 7, 1998 <br /> Attention Deanna Harding Work Order # 9806E65 01 P <br /> DUALITY CONTROL DATA REPORT <br /> Analyte. MTBE <br /> QC Batch#- 807004 <br /> Analy Method- EPA 8260 <br /> Prep Method. EPA 50308 <br /> Analyst* N A- <br /> MS/MSD #' BLK062598 <br /> Sample Conc . N D <br /> Prepared Date N A- <br /> Analyzed Date* 6/25/98 <br /> Instrument I D #. N A. <br /> Conc. Spiked. 50 yg/L <br /> Result- 51 <br /> MS % Recovery 102 <br /> Dup. Result 50 <br /> MSD % Recon . loo <br /> RPD 198 <br /> RPD Limit: 0-25 <br /> LCS #' LC8062698 <br /> Prepared Date N A. <br /> Analyzed Date- 6/25/98 <br /> Instrument I D #' NA <br /> Conc. Spiked 50 Mg/L <br /> LCS Result: 373 <br /> LCS % Recov 746 <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 /> • ELAP#1624 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 /> Tod Granecher <br /> Project Manager "'MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9806E65 GET <1> <br /> �x <br />