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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N Wiget Lane Walnut Creek CA 94598 (92S)988-9600 FAX(925)988-9673 <br /> 119 Striker Avenue Suite 8 Sacramento CA 95834 (9t6)921-9600 FAX(916)921-0100 <br /> 0 a- ) <br /> Analytical 1455 McDowell Blvd North Ste D Petaluma.CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Farmer Property, #62596 0001 <br /> }1260 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Drew Van Allen Work Order# 9806116 -05, 10 Reported Jul 15, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# MS070198MTBEH6B <br /> Analy Method- EPA 8260 <br /> Prep Method NA <br /> Analyst S Goldstein <br /> MS/MSD# 9806HD315 <br /> Sample Cone N D <br /> Prepared Date N/A <br /> Analyzed Date 7/1/98 <br /> Instrument I D# H6 <br /> Cone Spiked 50 Ng/L <br /> Result 39 <br /> • MS% Recovery 78 <br /> Dup Result 44 <br /> MSD % Recov 88 <br /> RPD 12 <br /> RPD Limit 0-25 <br /> LCS# LCS070198 <br /> Prepared Date N/A <br /> Analyzed Date 7/1/98 <br /> Instrument I D # H6 <br /> Cone Spiked 50 fig/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-free matrix that is analyzed using the same reagents, <br /> SEQUOIA 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 /> Imyai <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate,RPO=Relative%Difference 9807057 AAA <1> <br />