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It is the Division's understanding at this time that topsoil and overburden piles, while not located specifically on <br />the map, will be placed within the setback of the active area(s), located no more than 900 feet from the active <br />mining area, and fully within the permitted area as stated elsewhere in the application. Please confirm. <br />EXHIBIT D - Mining Plan (Rule 6.4.4): <br />It is the understanding of the Division that this will be a "dry mining" operation which will employ no clay liners <br />or slurry walls to isolate itself from the aquifer, therefore the cells will need to be continuously pumped until they <br />are reclaimed. Depth of mining appears to be approximately 35' b.g.s. based on map contours. Is this the <br />anticipated depth to bedrock? What is the underlying strata- shale? Disturbance (unreclaimed area) will be <br />limited to a maximum of 100 acres. Please confirm if this is correct. <br />Also please note that temporary cessation is limited to a maximum of two 5 year intervals, and that site <br />maintenance activities (weed control, etc) need to continue on-site even during periods of temporary cessation. <br />Please specify what setbacks will be maintained from the Last Chance Ditch, Sidehill Ditch and the gas/oil well <br />access roads, and confirm that these have been accurately reflected on the site maps. <br />EXHIBIT E - Reclamation Plan (Rule 6.4.5): <br />The Division understands that this property will be reclaimed primarily as open water ponds with rangeland <br />perimeters and some additional rangeland area in accordance with structure agreements obtained from owners of <br />gas/oil wells and the ditch company. <br />Please provide the following additional information: <br />• All information needed to satisfy section 3.1.5(9) items (a)-(f) of the rule concerning the use of off-site and <br />structural fill. The application states that an intent to import inert fill letter and inert material affidavit are <br />included, but these could not be found in the submitted application package. <br />EXHIBIT F - Reclamation Plan Map (Rule 6.4.6): Adequate as submitted. <br />EXHIBIT G - Water Information (Rule 6.4.7): Because this operation will be a dry mining operation with no <br />proposed isolation from the unconsolidated aquifer, the potential impact to the aquifer of this level/duration of <br />pumping is of special concern to the Division. Please provide the following information: <br />Locate on the map (in Exhibit C) tributary water courses, wells, springs, stock water ponds, reservoirs, and <br />ditches on the affected land and on adjacent lands where such structures may be affected by the proposed <br />operations. <br />o Please also provide the following information: <br />¦ Are there any wells within 600 feet of the permit area? <br />¦ Is any portion of the site within the 100 yr flood plain of the St Vrain Creek? <br />¦ Where are the existing or proposed groundwater level monitoring points? - Please locate on <br />appropriate maps and provide construction details (depth, screened intervals etc.) <br />¦ What is the current static water level and does the permittee already have the required 12 <br />months (and preferably more) of background groundwater level data to establish baseline <br />conditions prior to commencing dewatering? <br />¦ Is there a groundwater level monitoring plan for the site to monitor for potential off-site <br />impacts to the aquifer, establish trigger points for corrective actions, and describe what <br />corrective actions would be implemented? <br />¦ What is the anticipated pumping rate for the site? <br />