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Sequoia 680 Chesapeake Drive Redwood Cary,CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (510) 988 9600 FAX(5 10) 988 9673 <br /> 819 Straker Avenue Suite 8 Sacramento CA 95834 (916) 921 9600 FAX (916)921 0100 <br /> �IIF Analytical <br /> Delta Environmental Consultants Client Prolect'ID Exxon 7-3708, D09-809 <br /> , 3164 Gold Camp Drive, #200 Matrix Vc{uld <br /> 'Rancho Cordova, CA 95670 <br /> ~Attention Keoni Almeida Work Order# 97081319 -01 Reported Sep 5, 1997 J <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS0902978260H6A <br /> Analy Method EPA 8260 <br /> Prep Method- N A. <br /> Analyst L Zhu <br /> MS/MSD #• 97ov0002 <br /> Sample Conc.. N D <br /> Prepared Date. 9/2/97 <br /> Analyzed Date- 9/2/97 <br /> Instrument I.D.#: He <br /> Conc. Spiked. 50,ug/L <br /> Result 58 <br /> MS % Recovery 116 <br /> 0 <br /> Dup. Result 61 <br /> MSD % Recov.. 122 <br /> RPD- 50 <br /> RPD Limit. 0-25 <br /> v J r r S"Cv t'.roq X r vii J S♦ r i J♦ r } ,. <br /> nrhJr <br /> LCS # BLK090397 <br /> Prepared Date. 9/3/97 <br /> Analyzed Date. 9/3/97 <br /> Instrument I D ## Ne <br /> Conc. Spiked- 50pg/L <br /> LCS Result 52 <br /> LCS % Recov 104 <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 /> u A 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 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 /> regory "*MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference <br /> Piect Manager 9708D19 DLT <1> <br />