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Railroad Loop: The railroad loop was constructed in the 1979/1980 period. All disturbance <br />associated with the construction of the loop has been topsoiled and successfully revegetated <br />with a stabilization seed mixture (identified as DHG [Revegetated Hayden Gulch Disturbance] <br />in Tab 30, Vegetation). Total revegetated area associated with the railroad loop is <br />approximately 70.6 acres. The disturbance area is shown on Exhibit 12-1 (Revision 13, dated <br />06/06). <br />Runoff for a majority of the railroad loop does not drain to either of the sedimentation <br />structures. In order to demonstrate that the railroad loop meets the intention of the Rule <br />4.05.2(3), a SEDCAD+ analysis was conducted on the entire reclaimed section of the railroad <br />loop. <br />The SEDCAD+ analysis and all associated inputs are presented in Appendix 12-2, SYnall Area <br />Exemption Demonstrations. As shown in the analysis, due to the successful revegetation <br />efforts the peak settleable solid concentration is below the water quality effluent standard <br />of 0.5 ml/1. Given these results HGTI requested, and received CDMG approval to permit this <br />area as a small area exemption. <br />Areas 1 and 2: There are two small areas (Areas 1 and 2) which were disturbed during <br />construction o£ the loadout facilities area. The location of Areas 1 and 2 are shown on <br />Exhibit 12-2, (Revision 10, dated 06/06). After construction of the Loadout, the areas were <br />topsoiled and successfully revegetated with the DHG stabilization seed mixture. Total <br />revegetated area associated with the Areas 1 and 2 is approximately 0.6 and 0.9 acres, <br />respectively. Runoff from these areas do not drain to either the Truck Loop Pond or the <br />Rail Loop Pond. In order to demonstrate that the areas meet the intention of the Rule <br />9.05.2(3), SEDCAD+ analyses were conducted on both revegetated sections. <br />The SEDCAD+ analyses and all associated inputs are presented in Appendix 12-2, Small Area <br />Exemption Demonstration. As shown in the analysis, due to the successful revegetation <br />efforts, there is no runoff from either site. Given these results HGTI requested, and <br />received CDMG approval to permit this area as a small area exemption. <br />HG Shallow Well No. 1 and Water Pipeline <br />A water-supply well and associated pipeline were installed in the 1978/1979 time period as <br />part of the original loadout facility construction activities by the previous owner/ <br />operator/permittee. Following installation, the disturbed ground was revegetated. The <br />locations of the water-supply well and associated pipeline corridor are shown on Exhibit 12- <br />1 (Revision 13, dated 06/06). <br />The estimated extent of the disturbed area are 0.34 acres for the HG Shallow Well No. 1 and <br />TR-07 S Revised 06/06 <br />