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1�7 680 Chesapeake Drive Redwood City CA 94063 (650) 364 9600 FAX (650) 364 9233 <br /> Sequoia 404 N Wget Lane Walnut Creek CA 94598 (5$0) 988 9600 FAX (510) 988 9873 <br /> Analytical 819 Striker Avenue Suite 9 Sacramento CA 95834 (916) 921 9600 FAX (916) 921 0100 <br /> �I <br /> Delta Environmental Consultants Client Project ID Exxon 7-3708, D093-809 <br /> 3164 Gold Camp Drive, #200 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Keoni Almeida Work Order # 9711 F94-01-07 Reported Dec 12, 1997 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS120497MTBEF3A <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst M Williams <br /> MS/MSD # 97111`9405 <br /> Sample Conc 58 <br /> Prepared Date 12/4/97 <br /> Analyzed Date 12/4/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50ug/L <br /> Result 55 <br /> 0M % Recovery 98 <br /> Dup Result 58 <br /> MSD % Recov 104 <br /> RPD 53 <br /> RPD Limit 0-25 <br /> LCS # LCS 120497 <br /> Prepared Date 12/4/97 <br /> Analyzed Date 12/4/97 <br /> Instrument I D # F3 <br /> Conc Spiked 50ug/L <br /> LCS Result 51 <br /> LCS % Recov 102 <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 />&QUOI <br /> ALYTICAL 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 matnx <br /> Interference, the LCS recovery Is to be used to validate the batch <br /> Project Manager F*MS=Matrix Spike MSD=MS Duplicate RPD=Relative % Difference 9711F94 DLT <2> <br />