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Section 2 <br />Investigation Approach <br />0 <br />0 Notes: <br />Exhibit 2-2 (Continued) <br />MWMP Leachate Water Samples - Dissolved Metals/Metalloids <br />Analyte Method Reporting Limit (Ng/L)2 <br />Aluminum EPA 200.8/200.7 100 <br />Antimony EPA 200.8/200.7 1 <br />Arsenic EPA 200.8/200.7 1 <br />Barium EPA 200.8/200.7 1 <br />Beryllium EPA 200.8/200.7 1 <br />Boron EPA 200.8/200.7 100 <br />Cadmium EPA 200.8/200.7 1 <br />Chromium EPA 200.81200.7 1 <br />Cobalt EPA 200.8/200.7 1 <br />Copper EPA 200.8/200.7 1 <br />Iron EPA 200.8/200.7 30 <br />Lead EPA 200.8/200.7 1 <br />Lithium EPA 200.8/200.7 100 <br />Manganese EPA 200.8/200.7 1 <br />Mercury EPA 245.1 1 <br />Molybdenum EPA 200.8/200.7 1 <br />Nickel EPA 200.8/200.7 1 <br />Selenium EPA 200.8/200.7 1 <br />Silver EPA 200.8/200.7 1 <br />Thallium EPA 200.8/200.7 1 <br />Uranium EPA 200.8/200.7 1 <br />Vanadium EPA 200.8/200.7 1 <br />Zinc EPA 200.8/200.7 1 <br />'Sample container requirements shown for leachate samples are applicable to field collected water samples, based on the <br />approximate volumes needed to complete the listed analyses for a particular preservative type. Actual container sizes used during <br />the MWMP tests will be determined by the laboratory. <br />2Units in pg/L, unless otherwise noted. <br />3Acid-Base Accounting consists of reporting the following parameters: <br />-Total Sulfur -Residual Sulfur <br />-Water - Extractable Sulfur -Acid Potential <br />-HCl - Extractable Sulfur -Neutralization Potential <br />-HN03 - Extractable Sulfur -Net Acid Generating Potential (NAG or static peroxide test) <br />4NA = not applicable. <br />5Analysis should be performed as soon as possible, or immediately after sample collection. <br />SReporting limit will be specific to the electrode instrument utilized by the laboratory. <br />Radiochemistry samples have a sample specific Minimal Detectable Concentration (MDC) calculated as the reporting limit. The <br />MDC is affected by counting time, sample volume, total dissolved solids (TDS) concentration, and instrument background. <br />2.2.1 Development Rock Acid-Forming Potential Analyses <br />A primary concern with regard to potential DMO status is the potential for development rock to <br />be acid forming. Acid base accounting (ABA) analyses are commonly used to estimate the <br />potential for a sample to generate acid at some time in the future. The ABA procedure is a well- <br />established and widely used method to evaluate the potential for a rock to generate acid. The <br />propensity for a rock to generate acid drainage is dependent on both the acid generating and <br />acid neutralizing potential of a rock. Acid generation results from oxidation of sulfide minerals, <br />such as pyrite (FeS2). Acid neutralization results from minerals that will neutralize acid, such as <br />calcite (CaCO3) and dolomite (CaMg(CO3)2). <br />Acid potential is estimated based on a series of sulfur analyses. Sulfur is analyzed in fractions of <br />the sample that are soluble in water, hydrochloric acid, and/or nitric acid. A total sulfur <br />cm 2-4 <br />7:164996-Denison MineslTask Order 3 - OMO Sampling and Analysis Plan%Task 3.12 - Soil, Ore, Rock Data Assessment ReporltSunday Rock Repafltinal repoTReporffinal Sunday Minas Group Soil Ore Rock <br />Data Assessment Report_051509.doc