2011-01-13_PERMIT FILE - C1980006 (2)

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Section 780.21(b) Continued. Hydrology; and Map 17A, Kerr Tipple Area Hydrology. The monitoring schedule and parameters lists are shown on Table 61, Kerr Mine Area Hydrologic Monitoring Schedule. The monitoring program is designed to determine the extent of any impacts to the hydrologic resources in the Mine and Loadout areas. It is divided into two principle components: ground water monitoring and surface water monitoring. Ground water is monitored using the series of wells listed in Table 62, Kerr Mine Area Monitor Well Inventory, and shown on Map 48, Mine Area Monitoring Stations. Ground water monitoring wells were initially piaced into five distinct categories: Bedrock water level wells; bedrock water level/sample wells; alluvial water level wells; alluvial water level/sample wells; and spoil water level/sample wells. With the acceptance of TR-19, the monitoring schedule was altered to a more limited schedule due to the success of the revegetation and minimal impacts from mining. From 2000 to the bond release, monitoring has continued in accordance with Table 61. In 1999 (TR-19), post-mining when all pits had been backfilled, and the majority of the mine disturbance area regraded and revegetated, Kerr proposed to revise the water monitoring plan to reflect postmining conditions. The revised monitoring program included: 1. Installation of one spoil monitoring well in the reclaimed portion of the 720 Pit to monitor water levels and quality in the backfilled spoil material. See Map 48, Mine Area Monitoring Stations, for the location of a spoil well (designated Well SP-O1). This well was deemed adequate to monitor re-saturation, water level, and water quality in backfilled areas since the spoil material is relatively continuous and semi-homogenous as illustrated by Figure 40, Projected North-South Pit Bottom Profile, Pit 1, Marr Pit and 7a0 Pit. TR-23 760-107bbbR Revised June 2007