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Varra Companies, Inc. <br />Office of Special Projects <br />8120 Gage Street Frederick, Colorado 80516 Telephone (970) 353-8310 Fax(970)353-4047 <br />6.4.7 Exhibit G - Water Information <br />29. Please specify the point at which groundwater will be exposed. <br />Groundwater was measured at approximately 7.0± feet from the surface at Tracts A and B, and <br />approximately 28t feet from the surface at Tract C. Soil will be removed and placed as a visual <br />berm along the perimeter of planned extraction areas to expose overburden and deposit material. <br />We anticipated groundwater will be come exposed during the extraction of the first stage of <br />Tract A within the first six months subsequent to on-set of extraction activities at Tract A. Since <br />Overburden will be removed in a side hill operation at Tract C, we do not anticipate exposure of <br />groundwater until a majority of the overburden has been removed over Tract C. <br />30. Please commit to not exposing groundwater until a well permit and temporary substitute <br />water supply plan are obtained from the Office of the State Engineer (SEO). Also, please <br />commit to providing the Division with copies of the well permit and temporary substitute waters <br />supply plan once approved by the SEO. <br />The request of the Office under Item 30 is acknowledged and agreed to by the applicant. <br />31. In accordance with Rule 6.4.7(2)(b), the Division requests that the Applicant characterize <br />the aquifer in which mining will take place. In addition, the Division also requests that the <br />Applicant define or predict the cone of depression for any areas to be dewatered and dry mined. <br />The cone of depression should define, at a minimum, the horizontal and vertical extent of <br />expected impacts. If the Applicant determines that a drawdown effect will occur offsite that may <br />impact a current groundwater user, the applicant must define any mitigation measures to be <br />implemented as well as the trigger points that would put mitigation measures into effect. <br />Please refer to the groundwater study as reported by CGRS - Joby Adams, Hydrogeologist. <br />32. Based upon the potential for groundwater impacts from dewatering, the Division <br />recommends installing additional monitoring wells. The additional monitoring wells will help to <br />ensure compliance with Rule 3.1.6(1), which states disturbances to the prevailing hydrologic <br />balance of the affected land and of the surrounding area and to the quantity or quality of water in <br />surface and groundwater systems both during and after the mining operation and during <br />reclamation shall be minimized. Also, please provide the Division with a groundwater <br />monitoring plan. If the Applicant chooses to install a slurry wall or clay liner, then the additional <br />piezometers could be used to monitor for shadow and mounding effect that may impact <br />users. <br />Please refer to the groundwater study as reported by CGRS - Joby Adams, Hydrogeologist. <br />Varra Companies, Inc. correspondence of 30 June 2009 to the Colorado Office of Mined Land Reclamation 15 <br />(Office) in reply to Office correspondence of 12 May 2009 - Heintzelman Project - M2009-018.