2011-02-03_REVISION - M2000158 (16)

Home Browse Search

Mr, Ebert January 18, 2011 ?? Page 2 CIVIL RES-!_1t0URCES,LLC The Operator commits to testing the quality of topsoil and providing soil amendments as determined necessary to supplement the soil including: Nitrilized Aspen Humus, Nitrilized Aspen Compost, Organix Eco Compost, Gro Power, Premium 3 by A-1 Organics, or approved equal. The Operator will evenly distribute and place topsoil to 6" (minimum) depth over entire areas to be seeded/planted. The soil amendment will typically be placed at three (3) cubic yards/1,000 sq. ft. in all seed areas. Soil amendment will be completely mixed with topsoil. 6) You indicated the slurry wall will be keyed into the bedrock at a minimum depth of four feet. However, the Dam Typical cross-sections indicate the slurry wall will be keyed three feet into the bedrock at a minimum. Please revise the map to indicate a four foot minimum key depth. The cross-sections on the Reclamation Plan Map (Exhibit C) now indicate the four foot depth. Refer also to Exhibit E2 for details. 7) During the pre-operation inspection, it was noted a significant noxious weed infestation has occurred throughout the permit area. As part of the reclamation plan a detailed weed monitoring and mitigation plan will need to be submitted. Please provide the following information: a) The potential species of invasive weeds that may occur on the site include: Scotch thistle, musk thistle, Canada thistle, diffuse knapweed, Russian knapweed, hoary cress, salt cedar, leafy spurge and perennial pepperweed. b) A description of the various control measures that will be employed for the weed species such as mechanical, chemical, biological control or a combination of the these methods. ¦ Mow weeds before they flower. ¦ Burn areas with dead standing noxious weeds. ¦ Remove salt cedar trees by cutting them and immediately treating the cut stump with an herbicide. ¦ Watch for plant growth, spray infestations with an herbicide such as Milestone or 2,4-D in early spring. Apply the Milestone at a rate of 7 ounces/acre and add a non-ionic surfactant. ¦ Burn, mow and/or spray new rosettes in the fall. c) Submit a monitoring plan that describes how often the operator will monitor the site for noxious weeds (monthly, bi-monthly etc.) and what action will occur if noxious weeds are observed. Significantly weed cutting and burning has been recently completed. The Site will be sprayed as a follow-up measure this Spring and subsequently the operator will monitor the site for noxious weeds monthly during the Spring through the Fall and take the appropriate action as noted above if necessary. d) A post treatment monitoring plan to determine control effectiveness Refer response to comment c) above. e) A commitment that the weed control plan will be implemented for the life of the permit. The operator will implement the weed control plan for the life of the permit. 6.4.7 EXHIBIT G - Water Information Groundwater Monitoring and Mitigation Plan Review. 8) The groundwater monitoring plan indicates there is an existing surface drainage ditch on the south side of the site that transports groundwater to the South Platte River. Who is the owner of this ditch? It appears a portion of this ditch is within the overburden stripping area. Will this ditch be disturbed by overburden stripping? If so, will this ditch be relocated/replaced in order for it to continue to transport groundwater? The existing surface drainage ditch on the south side of the site is a "waste out" ditch that the Western Mutual Ditch has historically used to "equalize" or control the level of the ditch if excess inflow to their ditch occurs and