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Sequoia 680 Chesapeake Drive Redwood Cry CA 94063 (650) 364 9604 FAX(650) 364 9233 <br /> 404 N WIget Lane Walnut Creek CA 94598 1,510) 988-9600 "AX 1510 988 9673 <br /> 1a) Analytical 819 Striker Avenue Suite 6 Sacramento CA 95834 (916) 9Z1 9600 FAX (916)921 0100 <br /> Iwo1455 McDowell 8EvO ^lorry SrP D Petalurr3 r k 94954 1707) 79Z 1365 pox 7n7% 797 n31Z <br /> 0 <br /> Delta Environmental Consultants Client Project ID Exxon 7-3708 D093-809 <br /> 3164 cola Camp Drive, #200 Matrix Liquid <br /> Rancho Cordova, CA 95670 <br /> Attention Jim Brownell Work Order # 9803129-02-09 Reported Apr 10, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> OC Batch# MSO40598MTBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A. <br /> Analyst r_Zhu <br /> MS/MSD # 98031-4202 <br /> Sample Cone 170 <br /> Prepared Date - <br /> Analyzed Date 4/5/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 jig/L <br /> Result 220 <br /> S % Recovery 1e0 <br /> Dup Result 2-20 <br /> MSD % Recov 1c0 <br /> RPD 00 <br /> 9 D Limit C-25 <br /> LCS # LCSO40598 <br /> Prepared Date- <br /> Analyzed Date 4/5/08 <br /> Instrument I D # H6 <br /> Cone Spiked 50)rg/L <br /> LCS Result 56 <br /> LCS % Recov 112 <br /> 60-140 <br /> LCs 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS z a control sample of known, interferent-free matrix that is analyzed using the same reagents <br /> 01-101A.MALYTICAL preparation and analytical methods employed for the samples The matrix spike Is an aliquot of sample <br /> fortified wrth known quantities of specific compounds and subjected to the entire analytical procedure If <br /> the recovery of analytes from the matrix spike does not fail withm Specified control limits due to matrix <br /> Interference the LCS recovery Is to be used to validate the batch <br />;gegoryger NIS=Matrix Spike MSD--MS Duplicate RPO=Relative °o Difference 98031-29 DLT <4= <br />