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27 <br />Land Use Plan will be used to measure the potential impact associated with <br />compatibility of land uses. <br />SOIILCONDITIQNTS <br />The availability and types of soils at a site impact many aspects of landfill design <br />and operation. Cover soils are necessary for daily application to maintain a sanitary <br />operation (i.e., reduce blowing litter and vectors) and minimize odor and the visual <br />impact of the site. Soils are also frequently used to construct landfill liners and closure <br />caps. If the soils for daily cover and liners /caps are available on -site, substantial cost <br />savings can be realized in comparison with using off -site borrow sources. Furthermore, a <br />superior operation can be achieved if extra soils are readily available. <br />However, soils which are suitable for uce as a liner or cap are generally not <br />desirable as daily cover soils. Soils used for liners and caps are typically fine-grained, <br />poor draining soil's such as clays, sandy clays, or silty clays. These soil types can be <br />difficult to handle and cause operational difficulties during inclement weather (e.g., <br />slippery, unstable, and subject to ponding). "Good" cover soils are typically coarser, well <br />drained soils. <br />The impact rating for soil conditions is subdivided into two categories reflecting <br />the uses outlined above, namely cover use and liner and cap construction. Exhibit R4 <br />presents the impact ratings for soils as a function of their depth to bedrock and the <br />general types of soils on the site. The depth to bedrock provides a rough measure of the <br />quantity of material available for use as either cover soil or liner. The type of soil is <br />grouped into two categories: well drained /permeable soils and poorly <br />drained /impermeable soils. <br />For cover soil availability, lower impact ratings are assigned with increasing depth <br />and better drained soils. For soil liner and cap availability, lower impact ratings are <br />assigned with increasing depth and imperviousness. Use will be made of published soil <br />surveys, geologic reports, and water well records which frequently document depth to <br />rock. <br />5 <br />