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2"a Adequacy Review Comments <br />Page 3 of 5 <br />6.4.7 EXHIBIT G -Water Information <br />20. Impacts to: (A) Surface Water or (B) Groundwater Systems: <br />(A) Relative to the United States Army Corps of Engineers' 2003 floodplain study <br />(which utilized 1995 topography and has not been officially adopted by Weld County or <br />FEMA), the cun•ent configuration of the dike raises water surfaces by no more than 0.3 <br />feet at the flood events evaluated (10-, 50-, 100-, and 500-year). Varra Companies, Inc. <br />will remove the east portion of the berm to return it to its approximate 1973 <br />configuration. The western portion of the dike (constructed pre-1995) along with the <br />Final Reclamation Plan will be evaluated in the Flood Control/Mitigation Plan relative to <br />the effective regulatory floodplain and floodway as promulgated by Weld County and the <br />Federal Emergency Management Agency (See Response #16, 6.4.5 Exhibit F). <br />27. Floodway Designation & Flood Control Dike -Compliance with Rule 3.1.6: <br />A. Anderson Consulting Engineers, Inc. provides the following relevant and <br />available floodway designations and information for the Cache la Poudre River <br />near the Durham Pit: <br />1. Effective and Regulatory Information from FEMA <br />i. "Flood Insurance Study Weld County, Colorado ...", Revised: <br />September 27, 1991. <br />ii. Floodway -Flood Boundary and Floodway Map, Weld County, <br />Colorado, Pane14 and Pane16, Map Revised: September 28, 1990. <br />2. Additional Studies <br />i. USACE, "DRAFT Flood Insurance Study Revision Cache la Poudre <br />River City of Greeley and Weld County, Colorado", July 2003. <br />ii. City of Greeley, "Flood Plain Information Study Cache la Poudre <br />River City of Greeley & Weld County, Colorado", November 1999 - <br />Updated July 2003, Adopted by Greeley City Council August 2003, <br />Map 1 and Map 2. <br />B. Anderson Consulting Engineers, Inc. and Varra Companies, Inc. provides the <br />following maps and photographs showing the extent, elevation, and condition of <br />the flood control boundary along the south bank of the Cache to Poudre River at <br />the time of submittal of the original permit application (i.e. February 28, 1978): <br />Attached is an aerial photograph dated June 9, 1978 showing the <br />horizontal extents of mining and the berm between the pits and the Cache <br />la Poudre River. <br />COVC03 ACE 2nd Adequacy Rvw Comments mml.doc 7/6@004 <br />