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Sequoia 680 Chesapeake Drive Qee',ocd Crry CA 94063 (650) 364 9600 FAX(650) 364 9233 <br /> 1104 N Wrget Lane Walnut Creek CA 94598 (510)988 9600 FAX 15 10) 988 9673 <br /> 819 Striker Avenue Sulte 8 Sacramento CA 95634 (916)921 9600 FAX(916)9Z[ 0100 <br /> Analytical 1707 792 1865 FAX(707) 792 0342 <br /> 1455 McDowell Blvd North Ste D f etalum t CA 94954 ) <br /> Delta Environmental Consultants Client Prolect ID Exxon 7-3708 D093 809 <br /> 3164 Gold Camp Drive #200 Matrix Lluuld <br /> Rancho Cordova, CA 95670 Reported Apr 10 1998 <br /> Attention Jim Brownell Work Order # 98031-29-01 p <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MSO40598MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> Analyst L Zhu <br /> MS/MSD # 98031-4202 <br /> Sample Conc 170 <br /> Prepared Date - <br /> Analyzed Date 4/5/98 <br /> Instrument 1 D # HB <br /> Conc Spiked 50ug/L <br /> Result 220 <br /> �MS % Recovery 100 <br /> >up Result 220 <br /> MSD % Recov ica <br /> RPD 00 <br /> RPD Limit 0-25 <br /> LCS # LCSO40698 <br /> Prepared Date <br /> Analyzed Date 4/6/98 <br /> Instrument I D # H6 <br /> Conc Spiked 5ojig/L <br /> LCS Result 53 <br /> LCS % Recov 106 <br /> s0-140 <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 /> 0EQUOIA A ALYTICAL preparation, and analytical methods employed for the samples The matrix spike is an aliquot of sample <br /> fortified with known quantities of speclf:c 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 /> regary <br /> 4,fe Manager ""MS-Matrix Spike MSD=MS Duplicate RPD=Relative °a Difference 98031-29 DLT 3 <br />