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680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650)364 9233 <br /> ' Sequoia 404 N W,get Lane Walnut Creck 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 />' E A Engineering Science &Tech Client Project ID Exxon 7-0137, 51501 37 1300 <br /> 3468 Mt Diablo Blvd , Ste B-100 Matrix Liquid <br />' Lafayette, CA 94549 <br /> Attention Chnsta Marting Work Order# 9710816 03 Reported Oct 27, 1997 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batt;h# MA701997MT6EF2A <br /> Analy Method EPA 8260 <br /> Prep Method <br /> Analyst L Zhu <br /> MS/MSD# 971059109 <br />' Sample Conc 16 <br /> Prepared Date 10/19/97 <br /> Analyzed Date 10/19/97 <br /> Instrument I D # F2 <br />' Conc Spiked 50Ng/L <br /> Result 68 <br /> MS °k Recovery 104 <br /> Dup Result 71 <br /> MSD % Recov 110 <br />' RPD 56 <br /> RPD Limit 0-25 <br /> LCS # VM6102397 <br /> I <br />' Prepared Date 10/23/97 <br /> Analyzed Date 10/23/97 <br /> Instrument I D # F2 <br />' Conc Spiked 50Y9/L <br /> LCS Result 56 <br />' LCS % Recov 112 <br /> x0-140 <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 /> AN LYTICAL 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 /> �ichard He Ing L Interference the LCS recovery Is to be used to validate the batch <br /> R <br /> Protect Manage M8=Matrix Spike, MSD=MS Duplicate, RPD=Relative% Difference 9710816 EEE <1> <br /> r� <br />