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Sequoia 680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9233 <br /> 404 N WISet Lane Walnut Creek,CA 94598 (925)988-9600 FAX(925)988-9673 <br /> Analytical 819 Striker 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)792-0341 <br /> 1551 Industrial Road San Carlos CA 94070 411 1 (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 95351-1502 <br /> Attention Drew Van Allen Work Order# 9901 E94-01-08 Reported Feb 16, 1999 <br />' QUALITY CONTROL DATA REPORT <br />' Analyte Diesel <br /> QC Batch# SP0203998015EXA <br /> Anally Method EPA 8015Mod <br /> Prep Method EPA 3550 <br /> Analyst K Grubb <br /> MS/MSD # 9020192 <br /> Sample Conc 1 3 <br /> Prepared Date 2/3/99 <br /> Analyzed Date 2/3/99 <br />' Instrument I D # HP3 <br /> Conc Spiked 15 mg/Kg <br /> Result 13 <br /> JWS % Recovery 78 <br /> Dup Result 15 <br />' MSD % Recov 91 <br /> RPD 143 <br /> RPD Limit 0-50 <br />' LCS # LCS020399 <br /> Prepared Date 2/3/99 <br /> Analyzed Date 2/3/99 <br />' Instrument I D # HP3 <br /> Conc Spiked 15 mg/Kg <br /> LCS Result 14 <br />' LCS % Recov 93 <br /> 50-150 <br /> LCS 60-140 <br /> Control Limits <br />' Please Note <br /> EQUOIA 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 /> t 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 Klmy <br /> Project Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative% Difference 9901E94 AAA <3> <br />