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Section 2 <br />Investigation Approach <br />. the particular metal or metalloid, but they are useful in conducting general evaluations of the <br />2.2.3 Meteoric Water Mobility Procedure Analyses <br />potential for mine rock to cause adverse impacts to human health or the environment. The <br />mechanisms of human or environmental exposure may include leaching, dispersion as dust, <br />incidental ingestion though recreation activities or other mechanisms. In the event that <br />constituents occur in problematic concentrations in the mine rock, knowledge of total metals <br />concentrations facilitates development of appropriate mitigations to interrupt potential <br />mechanisms during mine development or reclamation and mitigate associated environmental <br />liabilities. <br />Some mine rocks have the propensity to cause mine drainage that contains elevated <br />concentrations of problematic constituents but is not acidic. Examples of constituents that may <br />be mobilized from mine rock at problematic concentrations under near-neutral pH conditions <br />include selenium, arsenic, and molybdenum. <br />The meteoric water mobility procedure (MWMP) is used to evaluate the potential for <br />constituents to be mobilized from mine rock by meteoric water. The procedure consists of a <br />single-pass column leach over a 24-hour period using a mine rock sample to extraction fluid <br />(effluent) ratio of 1:1. The extraction fluid is Type II reagent grade water (e.g. distilled or <br />deionized water). The extraction fluid is then analyzed for constituents of potential <br />environmental concern. <br />• 2.2.4 Geochemical Sorption Potential Analyses <br />Analyses of the geochemical adsorption potential of natural soils underlying the development <br />rock stockpiles were completed during this investigation. This information is included in <br />Attachment 3. <br />2.2.5 Physical Property Analyses <br />Physical properties of the development rock were examined to facilitate estimation of the <br />quantity of percolation that would be expected from the rock piles. Percolation through the <br />piles is controlled by climatic conditions such as precipitation and evaporation as well as <br />physical characteristics of the piles. Trench samples from the West Sunday and Topaz mines <br />were submitted for analysis of physical properties to provide site-specific data to use in <br />estimates of percolation through the piles. These geotechnical/physical test methods including <br />the following American Society for Testing and Materials (ASTM) methods: <br />¦ Standard proctor Analysis (ASTM D698) <br />¦ Grain Size Analysis (ASTM D422) <br />¦ Specific Gravity (ASTM C127/ D854) <br />¦ Capillary Moisture Retention (ASTM D2325) <br />¦ Saturated Hydraulic Conductivity (ASTM D5084) <br />• <br /> <br />2-6 <br />7:164986-Denison Mines%Task Order 3 - DMO Sampling and Analysis PlanlTask 3.12 - Soil, Ore, Rock Data Assessment Report%Sunday Rock Reportlfinal reportlReporOFinal Sunday Mines Group Soil One Rack <br />Data Assessment Report_651509.doc