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DEERE & AULT <br /> CONSULE ANTS. INC. <br /> February 9, 2012 <br /> Mr. Michael Fuchs,P.E. <br /> Fuchs Ranches,Inc. <br /> 1620 County Rd 14-A <br /> Del Norte, Colorado 81132 <br /> Re: Proposal for Inundation Mapping for Fuchs Reservoir <br /> Dear Mr. Fuchs: <br /> Deere&Ault Consultants, Inc. (D&A)has been requested to submit this proposal to Fuchs Ranches, <br /> Inc. for the preparation of dam breach inundation mapping for the dam at Fuchs Reservoir. We <br /> understand that the purpose of the breach modeling and the associated inundation mapping is for <br /> inclusion in the Emergency Action Plan for this reservoir. <br /> SCOPE OF STUDY <br /> The scope of this study is to perform dam breach modeling in accordance with the latest Breach <br /> Guidelines published by the Colorado Dam Safety Branch. The level of analysis shall be"Simple"as <br /> described in Table 1 of the Guidelines for both the breach modeling and flood inundation mapping. <br /> Flood routing models and inundation mapping shall be based on the USGS 10-meter Digital Elevation <br /> Model (DEM) or best available topographic mapping. Field measurements of bridges/culverts at <br /> critical sections shall be incorporated into the model as necessary. <br /> The limits of the dam breach flood mapping shall extend from Fuchs Reservoir downstream to where <br /> the breach flood impacts are no longer significant. The inundation mapping downstream from Fuchs <br /> Reservoir is expected to extend from the dam down the East Fork of Pinos Creek to Pinos Creek and <br /> terminate in the Rio Grande approximately 1,000 feet downstream of Del Norte. <br /> The inundation limits shall be prepared in UTM coordinates (NAD 83,Zone 13 —meters)which shall <br /> be overlaid on base mapping that includes color aerial imagery(2009 or newer). The inundation map <br /> shall be printed in color on a minimum sheet size of 11"x17". The inundation extents shall be clearly <br /> illustrated along with peak discharge estimates,peak flood wave arrival times and peak flood wave <br /> depths at critical locations. Roads, highways and critical infrastructure(schools,hospitals, fire <br /> stations, etc.) shall be annotated and any roads expected to be overtopped by the flood wave shall be <br /> identified. The map shall include a legend noting the dam name and DAMID, a north arrow and <br /> graphic scale. <br /> 600 S.Airport Road,Building A,Suite 205 <br /> Longmont,CO 80503 <br /> Phone: 303-651-1468• Fax: 303-651-1469 <br />