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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209)572-0900 Fax (209)572-0916 <br /> Report# Q252-16 QC REPORT <br /> San Joaquin County Environmental Health <br /> 304 E.Weber 3rd Floor <br /> Stockton CA 95202 <br /> NLS MSD LCS <br /> Zlyte Method Batch # Dates Analyzed Orig. Dupl. %Rec %Rec RPD %Rec Blank Comments <br /> Antimony 6020 I06183 09/20/04 116.2 113.6 2.1 94.2 ND <br /> Arsenic 6020 I06182 09/20/04 101.0 100.6 0.4 90.0 ND <br /> Barium 6010B I06184 09/20/04 93.6 95.0 0.5 92.2 ND <br /> Beryllium 6010B 106185 09/20/04 88.8 87.8 1.1 87.4 ND <br /> Cadmium 6010B 106186 09/20/04 98.8 100.0 1.2 97.2 ND <br /> Chromium 6010B I06187 09/20/04 95.8 97.6 1.4 97.0 ND <br /> Cobalt 6010B I06188 09/20/04 102.6 98.8 2.2 98.8 ND <br /> Copper 6010B I06189 09/20/04 104.6 106.2 0.3 93.4 ND <br /> Lead 6010B I06190 09/20/04 93.4 94.4 0.8 91.6 ND <br /> Mercury 6020A 106191 09/20/04 119.2 119.2 0.0 87.2 ND <br /> Molybdenum 6010B 106192 09/20/04 99.0 92.4 5.5 119.4 ND <br /> Nickel 6010B 106193 09/20/04 99.6 98.0 1.1 99.6 ND <br /> Selenium 6020 106194 09/20/04 100.4 99.0 1.4 ND Matrix interference(diluted out MS/MSD) <br /> Silver 6010B I06195 09/20/04 88.0 91.2 3.6 94.4 ND <br /> Th- n 6020 106196 09/20/04 92.6 93.6 1.1 96.6 ND <br /> Vart--ium 6010B I06197 09/20/04 103.2 104.8 0.8 99.2 ND <br /> Zinc 6010B 106198 09/20/04 98.0 98.0 0.0 81.6 ND <br /> * LCS/LCSD (see comments) <br /> Aa- -�"g - Lot, <br /> Kanti Gandhi Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />