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680 Chesapeake Drive Redwood City CA 94063 (650)364-9600 FAX(650)364-9Z33 <br /> Sequoia 404 N 1111get Lane Walnut Creek CA 94598 (925)988-9600 FAX(925)988-9673 <br /> 819 Straker Avenue Suite 8 Sacramento 95$34 (916)921-9600 FAX(916)991-0100 <br /> Analytical 14 <br /> 1455 McDowell Blvd North Ste D [Petaluma. 9 CA 94954 (707)792-1865 FAX(707)792-0342 <br /> ATC Associates, Inc Client Project ID Ripon Unified School <br /> '1260 Graphics Drive Matrix Liquid <br />' Modesto, CA 95351-1502 <br /> Attention Drew Van Allen Work Order# 9809E49 -02 Reported Oct 15, 1998 <br /> ' QUALITY CONTROL DATA REPORT <br /> Analyte Lead <br /> QC Batch# MEo9249870001VIDA <br /> Analy Method EPA 239 2 <br /> Prep Method- EPA 3020 <br /> Analyst J Jencks <br /> MS/MSD #. 9809D2201 <br /> ' Sample Cone 0 035 <br /> Prepared Date: <br /> Analyzed Date 10/1/98 <br /> Instrument I D # MTJA3 <br /> ' Cone.Spiked. 0 050 mg/L <br /> Result 012 <br /> MS %Recovery 1711 <br /> Dup Result 012 <br /> MSD %Recov 170 <br /> ' RPD 00 <br /> RPD Limit 0-20 <br /> LCS# LCS092498 <br /> ' Prepared Date 9/24/98 <br /> Analyzed Date 10/1/98 <br /> Instrument I D # MTJA3 <br /> ' Conc Spiked 0050 mg/L <br /> LCS Result 0 056 <br /> ' LCS % Recov.. 112 <br /> 75-125 <br /> LCS 80-120 <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 /> an�KtProject **MS=Matrix Spike,MSD=MS Duplicate,RPD=Relative X Difference 9809E49 AAA c 1> <br />