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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364 9233 <br /> Sequoia 404 N Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(915)988 9673 <br /> 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(9t6)921 0100 <br /> t �l� 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 N&S Irrigation 14981 0001 <br /> 1117 Lone Palm Avenue Matrix Liquid <br /> tModesto, CA 95351-1502 <br /> Attention Jeanne Homsey Work Order# 9902A44 -01-03 Reported Mar 3, 1999 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte MTBE <br /> 1 QC Batch# MS022699826OS2A <br /> Analy Method EPA 8260 <br /> ' Prep Method EPA 5030 <br /> Analyst N Ne#son <br /> MS/MSD # 9021705 <br /> ' Sample Cone 86 <br /> Prepared Date 2/26/99 <br /> Analyzed Date 2/26/99 <br /> Instrument I D # GCMS2 <br /> Cone Spiked 50Ng/L <br /> Result 70 <br /> MS % Recovery 122 <br /> Dup Result 68 <br /> MSD % Recov 119 <br /> ' RPD 29 <br /> RPD Limit 0-25 <br /> LCS # LCS030199 <br /> iPrepared Date 3/1/99 <br /> Analyzed Date 3/1/99 <br /> Instrument I ❑ # GCMS2 <br /> Cone Spiked 50pg/L <br /> LCS Result 48 <br /> ' LCS % Recov 96 <br /> 60 140 <br />- ' LCS 70-130 <br /> Control Limits <br /> Please Note <br /> SEQUOIA ANALYTICAL The LCS is a control sample of known interferent-free matrix that is analyzed using the same reagents, <br /> Elap#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 fail within specified control limits due to matrix <br /> r� interference,the LCS recovery is to be used to validate the batch <br /> Kayvan Kimyai <br /> ' Project Manager MS=Matrix Spike,MSD=MS Duplicate RPD=Relative%Difference 9902A44 AAA <1> <br /> �d <br />