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Mr. Rob Helmick ~- ~ July 20, 1999 Page 8 The operator proposes a French drain system azound the North and East perimeters of the property to intercept groundwater flows and maintain an avenue to route the flows around the proposed reservoir. This French drain will be similar to the field drains that are used by farmers to control high groundwater in agricultural fields. There aze some wetlands on the property. The mining operation avoids most of the wetlands on [he property. These wetlands may require additional permitting through the U.S. Army Corps of Engineers. A copy of the wetland delineation report is included as Attachment J. A copy of the applicants Stormwater Management Plan and the Colorado Discharge Permit application for Process Water and Stormwater Discharges are included as Attachments E & F. The Timnath Connell operation will have no significant impacts of the floodplain, therefore, we are not proposing any new hydraulic calculations. The creation of a lake during the mining phase and after reclamation could decrease the flood levels during the occurrence of an intermediate regional flood by creating extra storage azea for the flood waters and other surface water drainage. Listed below are the measures Connell will take to limit the negative impacts of mining in the floodplain: a) All processing equipment will be aligned to minimize impact of flood waters. Processing equipment will not be water tight. Processing equipment will be properly anchored to prevent flotation, collapse or lateral movement of the structures due to flooding events. The conveyors will move within the designated process area during the life of the operation. The floor of the scale house will be elevated a minimum of one foot above the 100-year floodplain elevation and will be anchored. b) The size of topsoil and overburden stockpiles will be limited. The topsoil and overburden stockpiles will be placed outside the floodway (??) and aligned in the direction of the flows (see Exhibit C). Stockpiles remaining in one location longer than one growing season shall be seeded to reduce erosional effects. c) No new or replacement domestic water wells, water supply, treatment or storage systems are planned for this site. d) No new replacement sanitary sewer treatment systems, including individual ~„ sewage disposal systems are planned.