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Rule <br />• Pursuant to this stipulation, HGCC attempted to eliminate grout contamination in the wells of concern <br />and submitted a revised groundwater monitoring plan in April 1987. Following discussions and meetings <br />with MLRD staff, another revised plan was submitted in September 1987. Two new (replacement) <br />monitor wells were completed (HG-1 and HG-2) and the revised groundwatu monitoring plan ultimately <br />approved by the MLRD Febmary 1, 1989 via TR-55. <br />The replacement wells are located down-dip of the reclaimed pit azea (I-IG-2) and down-dip of the former <br />shop/facilities area (HG-1). They were reportedly completed through the five coal seams mined at <br />Hayden Gulch which comprised a single, commingled aquifer system according to Yampa Mining <br />Company (the mine operator at the time). The application for TR-55 also contained a revised <br />groundwater monitoring plan and discussion of site-specific groundwater conditions. Results of <br />groundwater monitoring since 1987 are discussed in Section 2.05.6(3) of this document. <br />Surface Water <br />Currently, surface water monitoring is performed at two locations: one upstream of the reclaimed area, <br />Uppu Hayden Gulch, and one below the reclaimed mine azea, Lower Hayden Gulch (see Environmental <br />Morritoting and Sampling map). The upstream site along Hayden Gulch has minimal intemtittent flow, <br />as the mine is located at the top of the drainage. The lower site serves to monitor flow in Hayden Gulch <br />below the reclaimed mine and facilities areas. Monitoring requirements for two former surface water <br />monitoring sites in the Dry Creek drainage were deleted by the MLRD Febmaty 1, 1989 via TR-56. <br />The Lower Hayden Gulch site has been sampled semi-annually (twice/yeaz) since 1985. The upper site <br />has been sampled semi-annually since 1987 except for four occasions when flow was insufficient to allow <br />sample collection. Samples aze collected in late spring/early summer and in late summer/eazly fall and <br />• analyzed for an extensive suite of parameters. Tables UHG-1 and LHG-1 in the Annual Reclamation <br />Reports (Appendix E) present the results of monitoring since 1985 and 1987 for the two sites. <br />A spring and seep survey of the reclaimed azea is completed each spring to monitor contributions fiom <br />spoils springs to the surface water regime. A total of six sites have been regulazly monitored since January <br />1987. Field measurements of conductivity, pH, temperature and flow aze made for each spring. Samples <br />from RSP-3 and RSP-4 are also analyzed for an extensive pazameter suite. Tables RSP-1, RSP-3, and RSP- <br />4 is the Annual Reclamation Reports (Appendix E) present the results of spoil spring sampling since 1987. <br />Quarterly inspections of the four permanent water impoundments are also performed by HGCC to <br />observe water levels, sediment levels, and evaluate structural integrity. All pond inspection and monitoring <br />results are also included in the Annual Reclamation Reports to the DMG. Inspection and monitoring <br />results for 1994 aze included in Appendix E. Each Annual Reclamation Report contains a brief discussion <br />of surface water monitoring results. Section 2.05.6(3) of this document provides further evaluation of <br />recent monitoring results. <br />The existing monitoring and reporting program has been deemed adequate by the MLRD to detect any <br />impacts which could occur. Previous findings of the MLRD in conjunction with permit renewals have <br />concluded that the operation was in compliance with the requirements of this section. <br />l J <br />4.05-2 Revised - 11/28/95 <br />