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UNC Chapel Hill Permit <br /> iv. The attenuation capacity and mechanisms of the natural earth materials (e.g., <br /> ion exchange capacity, organic carbon content, mineral content, etc.). <br /> d. Based on data obtained from ground-water monitoring wells and piezometers <br /> installed up gradient and down gradient of the potential contaminant source, a <br /> representative description of water level or fluid pressure monitoring including: <br /> i. Water-level contour and/or potentiometric maps; <br /> ii. Hydrologic cross-sections showing vertical gradients; <br /> iii. The flow system, including the vertical and horizontal components of flow; <br /> and <br /> iv. Any temporal changes in hydraulic gradients, for example, due to tidal or <br /> seasonal influences. <br /> e. A description of man-made influences that may affect the hydrology of the site, <br /> identifying: <br /> i. Local water-supply and production wells with an approximate schedule of <br /> pumping; and <br /> ii. Man-made hydraulic structures (pipelines, trench drains, ditches, etc.) <br /> 2. Soils <br /> The Permittee shall conduct a program to characterize the soil and rock units above the <br /> water table in the vicinity of contaminant release(s). Such characterization may include, <br /> but not be limited to, the following types of information as appropriate: <br /> a. Surface soil distribution; <br /> b. Soil profile, including ASTM classification of soil; <br /> c. Transepts of soil stratigraphy; <br /> d. Hydraulic conductivity(saturated and unsaturated); <br /> e. Relative permeability; <br /> f. Bulk density; <br /> g. Porosity; <br /> h. Soil sorption capacity; <br /> i. Cation exchange capacity(CEC); <br /> j. Soil organic content; <br /> k. Soil pH; <br /> B-7 <br />