2013-01-29_PERMIT FILE - C1981010A

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• In accordance with TR-54 "1990, Annual Report" approval, the frequency of sampling for the following groundwater wells was modified to allow for semi-annual sampling (spring and fall): GA1, GA2, GB2, GB5, GD1, GD2, GD3, GE1, GE2, GF1, GF2, GF3, P5, 81-03A, GP3, GP4, GP5 and GP6. In the event, ash disposal occurs upgradient of currently semi-annual monitored ash wells, quarterly monitoring will be required. The GD-1(2) monitoring welt was proposed for semi-annual (list C) and annual (list B) sam- pling and replaces the requirement for sampling GD-1. In October 1991, Trapper's domestic water well, GD-1, began to experience substantial production problems. In January 1992, Trapper established a new domestic water well GD-1(2) (see MR-115) to supplement water produced from GD-1. Beginning in 1997, in accordance with Technical Revision TR-75, the frequency of sampling groundwater wells for water quality will be on a semi-annual basis (spring and fall). Sampling will be accomplished by pumping wells before water samples are taken. Monitoring of water level elevations for all groundwater wells will be on a quarterly basis. Groundwater sample data will be reported each year in the annual report. Table 4.8-13a lists the groundwater monitoring schedule for each well and Table 4.8-13 lists the parameters for each sample list. On September 5, 2003, in accordance to TR-92, Trapper discontinued monitoring wells GB1, 2 and 5 and GF1, 2 and 3. Monitoring was no longer required due to Phase 2 bond release. With approval of bond release application SL-7 in 2006, Trapper discontinued monitoring wells 81-03A, GE-1, GE-2, GE-3, GLUX, 1 and GP-6. During the current permit term, Trapper does not plan to establish any additional groundwater monitoring • wells. Sampling of the established wells will continue as described in Tables 4.8-13 and 4.8-13a. See Trapper's Annual Reports (Appendix W) for complete hydrologic findings and analysis. 10/07 • 4-247a