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Groundwater Monitoring. Groundwater monitoring at wells HGDALI, HGDAL2 and HGDAL3 <br />were conducted semiannually during the high and low flow periods, as specified for <br />surface water, through November 1995. As described in the revisions presented in <br />TR-O1, after four sampling and analytical events were completed for site HGDAL3, <br />then the monitoring at wells HGDALI and HGDAL2 was discontinued (as noted above, <br />HGTI abandoned monitor wells HGDAI.1 and HGDAL2 during 2005). Since November 1995, <br />only well HGDAL3 has been monitored as part of the groundwater monitoring program. <br />It has been monitored semiannually for water levels, field water quality parameters <br />(pH, temperature, and conductivity) and the parameter suite presented in Table 13- <br />2, Groundwater Parameter List. The groundwater parameter list has also been <br />revised. Monitoring for barium, molybdenum, phosphate, ammonia and silver will be <br />discontinued. These parameters are not listed in the groundwater agricultural <br />standards set forth by the CDPHE in Regulation 41, Basic Standards for Groundwater. <br />Sample analyses will be performed by a contract laboratory certif_ed by the State <br />of Colorado. <br />Colorado Wastewater Discharge Permit System (WPS) Monitoring. The CDPS permit for <br />the Hayden Gulch Loadout facility (COG-850008), was transferred from HGCC to HGTI . <br />on November 6, 1992. HGTI successfully renewed the CDPS permit i.n 1997, with an <br />effective date of July 1, 1997. HGTI recently renewed the permit, with a renewal <br />date affective of July 1, 2002. A copy of the WPS permit is presented in Appendix <br />13-1. The required CDPS monitoring at Outfalls 001 (Truck Loop Pond) and 002 (Rail <br />Loop Pond) (see Exhibit 12-2) will be performed in accordance with the terms and <br />cond%tions contained in WPS Permit No. COG-850008 (see Appendix 13-1}. <br /> <br />TR-06 10 Revised OS/OS <br />