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Rule 4.05 <br />• Pursuan[ to this s[ipulation, HGCC attempted to eliminate grout contamination in the wells of <br />concern and submitted a revised groundwater monitoring plan in April 1987. Following <br />discussions and meetings with MLRD staff, another revised plan was submitted in September <br />1987. Two new (replacement) monitor wells were completed (I-IGl and HG2) and the revised <br />groundwater monitoring plan ultimately approved by the MLRD February 1, 1989 via TR-55. <br />The replacement wells are located down-dip of the reclaimed pi[ area (HG2) and down-dip of <br />the former shop/facilities area (HGl). They were reportedly completed through the five coal <br />seams mined a[ Hayden Gulch which comprised a single, commingled aquifer system according <br />to Yampa Mining Company (the mine operator at the time). The applica[ion for TR-55 also <br />contained a revised groundwater monitoring plan and discussion of site-specific groundwater <br />conditions. Resul[s of groundwater monitoring since 1987 are discussed in Section 2.05.6(3) of <br />this document. <br />Surface Water <br />Currently, surface water monitoring is performed at two localions: one ups[ream of the <br />reclaimed area, Upper Hayden Gulch, and one below the reclaimed mine area, Lower Hayden <br />Gulch (see Environmental Monitoring and Sampling map). The ups[ream site along Hayden <br />Gulch has minimal intermitten[ flow, as the mine is located at the top of the drainage. The <br />lower si[e serves to monitor flow in Hayden Gulch below the reclaimed mine and facilities <br />areas. Monitoring requirements for two former surface water monitoring sites in the Dry Creek <br />drainage were deleted by the MLRD February 1, 1989 via TR-56. <br />• The Lower Hayden Gulch site has been sampled semi-annually (twice/year) since 1985. The <br />upper site has been sampled semi-annually since 1987 except for four occasions when flow was <br />insufficient to allow sample collettion. Samples are colletted in late spring/early summer and <br />in late summer/early fall and analyzed for an extensive suite of parameters. Tables UHG1 and <br />LHG1 in the Annual Reclamation Reports (Appendix E) present the results of monitoring since <br />1985 and 1987 for the two sites. <br />A spring and seep survey of the reclaimed area is completed each spring to monitor <br />contributions from spoils springs [o the surface water regime. A total of six sites have been <br />regularly monitored since January 1987. Field measurements of conductivity, pH, temperature <br />and flow are made for each spring. Samples from RSP-3 and RSP-4 are also analyzed for an <br />extensive parameter suite. Tables RSP-1, RSP-3, and RSP-4 is [he Annual Reclamation Reports <br />(Appendix E) present the results of spoil spring sampling since 1987. <br />Quarterly inspettions of the four permanent water impoundments are also performed by <br />HGCC to observe water levels, sediment levels, and evalua[e s[ructural integrity. All pond <br />inspection and monitoring results are also included in the Annual Reclamation Reports to the <br />DMG. Inspection and monitoring results for 1994 aze included in Appendix E. Each Annual <br />Reclamation Report contains a brief discussion of surface water monitoring results. Section <br />2.05.6(3) of this document provides further evalua[ion of recent monitoring results. <br />The existing monitoring and reporting program has been deemed adequate by the MLRD to <br />detect any impacts which could occur. Previous findings of the MLRD in conjunction wi[h <br />permi[ renewals have concluded that the operation was in compliance wi[h [he requirements of <br />• this section. <br />H.\e)]\rE RMn\RULEI-05. HG <br />ivzei9s z:.orm wrszi~~ 4.05-2 Revised - 11/28/95 <br />