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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto,CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br /> Report# P259-07 QC REPORT <br /> San Joaquin County Environmental Health <br /> 304 E.Weber 3rd Floor <br /> Stockton CA 95202 <br /> MS MSD LCS <br /> Analyte Method Batch # Dates Analyzed Orig. Dupl. %Rec %Rec RPD %Rec Blank Comments <br /> Antimony 204.2 I06286 9/17/03 93.1 95.2 2.2 103.6 ND <br /> Arsenic 206.2 106287 9/17/03 97.7 98.2 0.5 104.3 ND <br /> Barium 200.7 I06289 9/17/03 97.2 99.2 0.6 99.1 ND <br /> Beryllium 200.7 I06288 9/17/03 95.9 95.7 0.2 103.1 ND <br /> Cadmium 200.7 I06291 9/17/03 90.5 91.2 0.8 106.7 ND <br /> Chromium 218.2 I06292 9/17/03 109.0 110.1 1.0 107.8 ND <br /> Cobalt 200.7 I06323 9/17/03 102.6 104.1 1.5 110.8 ND <br /> Copper 200.7 I06293 9/17/03 98.4 105.8 3.1 109.6 ND <br /> Lead 239.2 I06295 9/17/03 91.2 92.3 1.0 100.3 ND <br /> Mercury 245.1 I06294 9/17/03 97.3 113.3 * 15.2 ND Matrix interference(diluted out MS/MSD) <br /> Molybdenum 200.7 106324 9/17/03 99.6 102.4 2.8 101.0 ND <br /> Nickel 200.7 I06296 9/17/03 101.2 103.0 0.8 111.9 ND <br /> Selenium 270.2 I06297 9/17/03 85.7 85.7 0.0 108.7 ND <br /> Silver 200.7 I06298 9/17/03 98.9 105.0 * 6.0 ND Matrix interference(diluted out MS/MSD) <br /> Thallium 279.2 I06299 9/17/03 93.0 95.2 2.3 101.7 ND <br /> Vanadium 200.7 I06325 9/17/03 107.8 108.6 0.7 110.5 ND <br /> Zinc 200.7 I06300 9/17/03 109.0 100.6 3.2 108.0 ND <br /> *LCS/LCSD (see comme <br /> o i 'mbaywala Donna Keller <br /> Inorganic Supervisor Certification # 1157 Laboratory Director <br />