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Sequoia 680 Chesapeake Drive Redwood CityCA 94063 (650) 364 9600 FAX{6501 364 9233 <br /> 404 N Wager Lane Wiinut Creek CA 94598 {925}988 9600 FAX(925)988 9673 <br /> a- Analytical 819 Striker Avenue Suite 8 Sacrunerm CA 95834 (916} 921 9600 FAX (916)921 0100 <br /> 1455 McDowell Blvd North Ste D f Etalumi CA 94954 7071 792 1865 Fnx i707i 792 0342 <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 Jim Brownell Work Order # 9807152 06-08 Reported Jul 14, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS070898MTBl=H6A <br /> Analy Method EPA 8250 <br /> Prep Method <br /> Analyst M Williams <br /> MS/MSD # 970715201 <br /> Sample Conc 15 <br /> Prepared Date 7/8/98 <br /> Analyzed Date 7/8/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50pg,L <br /> Result 66 <br /> MS % Recovery 102 <br /> Dup Result 6,1 <br /> MSD % Recov 98 <br /> RPD 31 <br /> RPD Limit 0-25 <br /> LCS # LCS070898 <br /> Prepared Date 7/8/98 <br /> Analyzed Date 7/8/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50pg/L <br /> LCS Result 48 <br /> LCS % Recov 96 <br /> s0-140 <br /> LCS 70-130 <br /> Control Limits <br /> Please Note <br /> The LCS rs a control sample of known, interferent-free matrix that is analyzed using the same reagents <br /> ;hard <br /> IA AN LYTIC 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 /> Herling <br /> Project Manager MS-Matrix Spike, MSD=MS Duplicate, RPD=Relative %Diff erence 9807152 DLT <2> <br /> Ca - - - - - - <br />