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effluent in the Brent of periodic flooding of the adjacent South P/nne River. " (Scott, Brochnrd, Depratt.Odenbuugh, Remick & Rippe: Februnn l4, 2001) Division Response- On April b. 2001, the Division approved the application containing specific language regarding mining within the 100-year f7oodplain, Specifically, the applicant stated that they will not mine in the floodplain until a floodplain analysis and mitigation plan is developed and submitted to the Division for review and approval. A majority of the site is within the 100-year floodplain. On April 23, 2001. Platte Sand & Gravel submitted a Technical Revision ("TR") to the application to address the issues regarding mining within the flovdplain. DMG reviewed the plan and provided comments and suggestions consistent with the In-Stream Aggregate Extraction and Reclamation Guidance Document. The TR contains a tloodplain mitigation and control plan addressing locations where rock armoring is necessary, sizing and placement of the riprap, estimated cost to ins[all the riprap and a time table for rip rap installation. The applicant has committed to armoring the riverbanks before mining within 400 feet of those banks subject to erosion. On May 22, 2001 the applicant responded to the Division's adequacy letter. The response was found to he acceptable for approval. No public comments/objections were submitted to the Division retarding the TR application. 5. Evaporative loss front the reclaimed lake surface aril water augrnenlatiorr plait. (Scott, Brocl~ard, Depratt, Odenbaugh, Remick & Rippe) • "The venter v.hich world he required for augmentation of the ernporatire lass from the lake surface in this reclammion plan is significant. The ,eater is currentk alaila6le for agriculnrre production and it world be lost for such purpose in perpetuity. " (Scott, Brachard, Depratt, Odenbaugh. Reituck & Rippe; Februan' 14, 200/) Division Response- Platte Sand & Gravel predicts that 2.274.23 acre-feet of water to evaporate from the exposed lake areas each year. This assumes a lake surface of 768.32 acres with an average net annual evaporation of 2.96 acre-ft/surface acre. The applicant states they have no Curren[ water rights to use for make up water. The applicant may not expose groundwater until a well permit is issued by the Colorado Division of Water Resources, Office of the State Engineer ("OSE"). The applicant states that a Temporary Substitute Supply Plan ("TSSP") and well permi[ have been filed with the OSE. In the TSSP, the applicant will commit to buying water from Longmont to cover the industrial and evaporative uses associated with the operation during the first five years. The applicant has committed that groundwater will not be exposed until they have received necessary approvals from the OSE. 6. Containment and disposal plan for mine and planet generated chemicals aced oNrer byproducts. (Scott, Brod:ard, Depratt, Odenbaugh, Remick & Rippe) • "Proper containment and disposal ojnriae aril pima generated chemicals or other tonic by-products are essential ro groundwater protecriort. These comainmenr and disposal plans must be detailed prior to grmuing permit." (Scott, Brochard, Depratt. Odenbaugh, Remick & Rippe; Februan 14, 2001) Division Response- The applicant is required to properly dispose of mine and plant generated chemicals in accordance with the Regulations of the Colorado Department of Public Health and Environment. Only "inen material" tnay be left on site and utilized in the reclamation plan (the applicant has demonstrated compliance regarding disposal of "inert material" at the site), The plant area will facilitate portable structures including a process plant, asphalt batch plant and concrete plant. Water associated with the processing plant area will be directed to the silt pond and contained on the mining area. The concrete and asphalt plant will be lined with a double layer of 60-mil vapor barrier and will be used as a double liner in the depression. Four inches of clean sand will cover the barrier and will be capped with roadbase material. In addition, a small containment berm will be placed around the plant site to contain the area. The berm will be eneineered to contain the amount of liquid products stored in each plant site area. 7. Poreretial M•ildlije llabirat loss and delineation of brrffer;orres to protect eagle roost habitat, (hlicltael Ptasrrik) • "This ^'rndd also hove n substannallr negarn a inrpnct an the e.ristirrg u'ildlije and mould adverseh r~ect this hnbirm. The Platte Rirer runs nlong the ,rest and rrmth side ojthis propern~. Deer, eagles and ha,vks, o,rls. rluc'ks mid orher,cpecies live in dris habimt. " (M1/ic/me/ J. Pmsnik; Februan' 7, Z(10/)