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' 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Straker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Diesel Performance 62577 0001 <br /> 1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 9535 1-1 502 <br /> Attention Jeanne 1lomsey Work Order# 98091-144 -01 Reported Nov 16, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# M80930981VITBEH6A <br /> Analy Method EPA 8260 <br /> Prep Method N A <br /> ' Analyst M Williams <br /> MS/MSD # 9809E4901 <br /> ' Sample Conc ND <br /> Prepared Date 9/30/9a <br /> Analyzed Date 9/30/98 <br /> Instrument I D # H6 <br /> ' Conc Spiked 50 pg/L <br /> Result 45 <br /> �NIS % Recovery 90 <br /> Dup Result 46 <br /> MSD % Recov 92 <br /> RPD 22 <br /> RPD Limit 0-25 <br /> LCS # LCS093098 <br /> ' Prepared Date 9/30/98 <br /> Analyzed Date 9/30/98 <br /> Instrument I D # H6 <br /> ' Conc Spiked 50jrg/L <br /> LCS Result 45 <br /> ' LCS % Recov 90 <br /> 60-140 <br /> LCS 70-130 — <br /> Control Limits <br /> Please Note <br /> The LCS is a control sample of known, interferent-tree matrix that is analyzed using the same reagents, <br /> EQUOIA ANALYTICAL 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 /> Ka Kimy <br /> ' P olect Manager *" MS=Matrix Spike, MSD=MS Duplicate RPD=Relative% Difference 98091-144 AAA <1> <br />