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Christy Woodward <br />le July 31, 2008 <br />Page 5 <br />for all constituents listed under the Colorado Department of Public Health and Environment <br />(CDPHE) Regulations 31 (surface water) and 41 (groundwater). As recommended by DRMS, <br />various constituents from these CDPHE regulations are omitted from the analyte list and <br />hardness, conductivity, dissolved oxygen, and oxidation reduction potential were added to <br />the analyte list. The MWMP method, American Society of Testing and Materials (ASTM) <br />E2242-07, is included as Attachment A (ASTM 2007). <br />The collection of representative ore samples is also an important aspect of the characterization <br />program. Accordingly, two representative composite ore samples will be collected from the <br />Sunday Group mines. These samples will be analyzed for ABA and MWMP. Ore is not <br />currently present at the Van 4 or Carnation mines. However, once ore is generated from these <br />mines, ore samples will be collected and characterized. <br />Following collection of development rock and ore samples additional sampling will occur <br />within the native surface and subsurface soil/rock located near each of the development rock <br />areas. These samples will support assessment of soil and rock underlying the development <br />rock areas, which may be in contact with seepage from the development rock areas. MWMP <br />data will be used to evaluate which constituents may leach from the development rock areas. <br />Geochemical sorption potential analysis will then be performed on native soil samples for <br />• each particular constituent that is selected based on results of the MWMP analyses. The <br />geochemical sorption potential method, ASTM D4646-03, is included as Attachment B (ASTM <br />2004). This process will further characterize the potential for leachate from development rock <br />areas to affect the environment. <br />Three samples will be collected from native soil surrounding the Sunday, West Sunday, and <br />Topaz mine development rock areas and one sample will be collected from the Brushy Basin <br />Member of the Morrison Formation (shale). The locations of the soil samples will represent <br />the native soil horizon at each mine location, preferably near the toe of the development rock <br />areas. The shale sample will be collected from surface outcrops of these deposits located <br />approximately 500 to 1000 feet south and west of the mine areas. <br />Each of the soil samples and the shale sample will be visually logged in-field using the USCS, <br />and then submitted for laboratory analysis for geochemical sorption potential. For soil <br />samples, the laboratory sample should represent a composite of all the materials or layers <br />present in the soil horizon that are accessible with the sampling equipment. USCS logging of <br />the entire soil horizon may be needed to adequately describe the layered material, if present. <br />USCS data will be used to evaluate the physical properties of the materials to be used in <br />adsorption attenuation modeling. <br />Samples of background soils are also planned to be collected to assist in interpretation of total <br />metals data collected from development rock areas. Nine background soil samples of soils <br />will be collected in areas upslope and upwind from the existing mine facilities to estimate <br />background metal concentrations. Background soil samples will be collected by hand using a <br />0:164986 - Denison%Task Order 3 - DMO Sampling and Analysis PlanlTask 3.1- Sal Ore Rods Data Collection Plan%Rnal Denison Sunday Mines Group Sail Ore Rods Data <br />Collection Work Plan.doc