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680 Chesapeake Drive Redwood City CA 94063 •50) 364-9600 FAX(650)364-9233 <br /> Sequoia 404 N Wlget Lane Walnut Creek,CA 94598 (9Z5)988-9600 FAX(925)988-9673 <br /> �7 ] <br /> 7. 819 Striker Avenue Suite 8 Sacramento CA 95834 (916)921-9600 FAX(916)92t-0100 <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 Bozzano Property <br /> 1268 Graphics Drive Matrix Liquid <br /> Modesto, CA 95351-1502 <br /> Attention Tom Lutterman Work Order# 9806E06-15, 16 Reported Jul 7, 1998 <br /> QUALITY CONTROL DATA REPORT <br /> Analyte Lead <br /> QC Batch# ME062298700OMDA <br /> Analy Method EPA 239 2 <br /> Prep Method EPA 3020 <br /> Analyst R Butler <br /> MS/MSD# 9806C2201 <br /> Sample Conic 00052 <br /> Prepared Date 6/22/98 <br /> Analyzed Date 6/26/98 <br /> Instrument I D # MTJA6 <br /> Conc Spiked 0 050 mg/L <br /> Result 0 055 <br /> �IMS% Recovery 100 <br /> Dup Result 0 064 <br /> MSD % Recov 98 <br /> RPD 18 <br /> RPD Limit 0-20 <br /> LCS # BLK062298 <br /> Prepared Date 6/22/98 <br /> Analyzed Date 6/23/98 <br /> Instrument I D # MTJA3 <br /> Conic Spiked 0 050 mg/L <br /> LCS Result 0 050 <br /> LCS %Recov 100 <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 /> �EQUQIA 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 /> Ka Clmyai <br /> oject Manager **MS=Matrix Spike,MSD=MS Duplicate, RPD=Relative%Difference 9806E06 AAA <2> <br />