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680 Chesapeake Drive Redwood Qty CA 94063 (650) 364-9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (925)988-9600 FAX(92 5)988•-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921 0100 <br /> 4W Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Continental Grain <br /> 1260 Graphics Drive Matrix Solid <br /> Modesto, CA 9535 1-1 502 <br /> Attention Drew Van Allen Work Order# 9808898-01-06 Reported Sep 2, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> GSC Batch# MS082098MTBEEXA <br /> Analy Method EPA 8260 <br /> Prep Method NA <br /> Analyst L Zhu <br /> MS/MSD# 980889801 <br /> Sample Conc N D <br /> Prepared Date 8/20/98 <br /> Analyzed Date 8/20/98 <br /> Instrument I D# HIS <br /> Conc Spiked 2500 y9/K9 <br /> Result. 1900 <br /> �MS % Recovery 76 <br /> Dup Result 1800 <br /> MSD % Recov.. 72 <br /> RPD 54 <br /> RPD Limit 0-25 <br /> LCS# LC8082098 <br /> Prepared Date 8/20/98 <br /> Analyzed Date 8/20/98 <br /> Instrument I D # HIS <br /> Conc Spiked 2500 pg/Kg <br /> LCS Result 2200 <br /> LCS % Recov 88 <br /> 60-140 <br /> LCS 70-130 <br /> Control Limds <br /> Please Note <br /> The LCS is a control sample of known,interferent-free 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 mya� <br /> olect Ma `aC' **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative%Difference 9808898 AAA <2> <br />