2008-03-13_PERMIT FILE - C1992081A (6)

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Groundwater Monitoring. Groundwater monitoring at wells HGDALI, HGDAL2 and HGDAL3 were conducted semiannually during the high and low flow periods, as specified for surface water, through November 1995. As described in the revisions presented in TR-O1, after four sampling and analytical events were completed for site HGDAL3, than the monitoring at walls HGDALI and HGDAL2 was discontinued (as noted above, HGTI abandoned monitor walla HGDALl and HGDAL2 during 2005). Since November 1995, only well HGDAL3 has been monitored as part of the groundwater monitoring program. HGTZ added monitor well HGDRL4 to the monitoring program during 2005 as part of TR- 06. Those wells are monitored semiannually for water levels, field water quality parameters (pH, temperature, and conductivity) and the parameter suite presented in Table 13-2, Groundwater Parameter List. The groundwater parameter list has also been revised. Monitoring for barium, molybdenum, phosphate, ammonia and silver will be discontinued. These parameters are not listed in the groundwater agricultural standards eet forth by the CDPHE in Regulation dl, Basic Standards for Groundwater. Sample analyses will be performed by a contract laboratory certified by the State of Colorado. Colorado Wastewater Discharge Permit System (COPS) Monitoring. The COPS permit for the Hayden Gulch Loadout facility (COG-850008), was transferred from HGCC to HGTI on November 6, 1992. HGTI successfully renewed the CDP9 permit in 1997, with an effective date of July 1, 1997. HGTI recently renewed the permit, with a renewal date effective oP July 1, 2002. A copy of the COPS permit is presented in Appendix 13-1. The required CbPS monitoring at Outfalls 001 (Truck Loop Pond) and 002 (Rail Loop Pond) lsee Exhibit 12-2) will be performed in accordance with the terms and conditions contained in COPS Permit No. COG-850006 (see Appendix 13-1). l ~.. TR-06 10 Revised 06/05