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1 <br /> Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650) 364-9600 FAX(650)364-9233 <br /> 404 N W1get Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)921-0100 <br /> frilly Analytical 1455 McDowell Blvd North Ste D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> 1551 Industrial Road San Carlos, CA 94070-4111 (650)232-9600 FAX(650) 232 9612 <br /> ATC Associates, Inc Client Project ID Ripon Unified School <br />' 1117 Lone Palm Avenue Matrix Solid <br /> Modesto, CA 9535 1-1 502 <br /> Attention Drew Van Allen Work Order# 9901 E94-01-03, 06-08 Reported Feb 16, 1999 <br />' QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> QC Batch# SP0203998260EXA <br /> Analy Method EPA 8260 <br />' Prep Method EPA 5030 <br /> Analyst N Nelson <br /> MS/MSD# 9020192 <br /> Sample Conc ND <br /> Prepared Date 2/3/99 <br /> Analyzed Date 2/3/99 <br />' Instrument I D # GCMS2 <br /> Conc Spiked 2500 pg/Kg <br /> 1W Result 2800 <br /> S %Recovery 912 <br /> Dup Result 3100 <br />' MSD% Recov 124 <br /> RPD 10 <br /> RPD Limit 0-25 <br /> 1 <br />' LCS # LCS020399 <br /> Prepared Date 2/3/99 <br /> Analyzed Date 2/3/99 <br />' Instrument I D # GCMS2 <br /> Conc Spiked 2500jug/Kg <br /> LCS Result 2700 <br />' LCS % Recov 108 <br />' 60-140 <br /> LCS 70-130 <br /> Control Limits <br />' Please Note <br /> EQUIDIA ANALYTICAL The LCS is a control sample of known, interferent-free matrix that is analyzed using the same reagents, <br /> lap#1271 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 /> Ka;� interference,the LCS recovery is to be used to validate the batch <br /> Prof I <br /> Project Manager **MS=Matrix Spike, MSD=MS Duplicate, RPD=Relative%Difference 9909E94 AAA <2> <br />