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• erosion and promote the growth of vegetation on disturbed or <br />reclaimed lands. <br />Through careful planning, coordination and implementation of these <br />practices and measures, erosion is controlled at or below maximum <br />acceptable levels. In many cases, reclaimed lands maintain erosion levels <br />that are less than those occurring in the undisturbed premining <br />environment. <br />4.3.6.2 Erosion Inventory and Monitoring <br />Although mining and reclamation planning incorporates a thorough site <br />evaluation, it is impossible to fully anticipate all site conditions that <br />may possibly represent excessive erosion potentials, particularly <br />hydrologic conditions and meteorologic phenomenon. Therefore, in order to <br />identify unexpected erosion features and potential problem areas, <br />reconnaissance and monitoring of reclaimed lands will be conducted. This <br />mine-wide monitoring will be conducted shortly after snowmelt of each year <br />(typically May or early June) and will emphasize bonded, reclamation areas, <br />haulroad ditches and concentrated flow structures. Any areas or structures <br />• which appear to, or have the potential to, exhibit excessive erosion will <br />be identified and inventoried during this survey. <br />Areas identified during the survey will be monitored periodically to <br />determine if erosion is excessive or represents a threat to the postmining <br />land use. Should previously unidentified erosion features, which appear or <br />have the potential to exhibit excessive erosion, be discovered outside of <br />_ routinely scheduled internal inspections (i.e., during CDMG or OSMRE <br />inspections), such features will be added to the inventory and monitored. <br />Monitoring may either evaluate specific features or may consider the entire <br />site. Monitoring of specific sites will be tailored to the type or types <br />of erosion process (i.e., sheet or concentrated flow) particular to that <br />area. <br />For instance, rills normally form on newly reclaimed areas with <br />nominal vegetation cover that receive large volumes of precipitation within <br />a short time period from localized thunderstorms. Most often, this type of <br />erosion is self-repairing and corrects itself over a period of one to <br />several years as vegetation establishes to the point that the soil surface <br />is adequately protected. Adequate monitoring for this type of rill erosion <br />may be accomplished through simple, periodic, visual observations. If the <br />• slope in question heals as expected, then no further work is required. <br />Renewal-3 9.3-19 June 13, 1997 <br />