Laserfiche WebLink
Ms. Jill A. Baty <br /> December 16, 2011 <br /> Page 3 <br /> minute quadrangle elevation data and was then processed to filter out production artifacts from the <br /> existing data. The NED is updated every two months to include new and improved elevation source <br /> data and is considered the best available raster elevation dataset. D&A has the ability to contour the <br /> DEM at any desired interval using 3D Analyst in ArcGIS. The quality of the output elevation contours <br /> shall be controlled by comparing the index contours to the USGS 7.5-minute topographic images. <br /> Requests shall be made to Weld County Public Work, Boulder County Transportation, and the City of <br /> Longmont to obtain information regarding the opening dimensions and roadway elevations at <br /> potentially critical bridges in the study reaches. Prior to conducting the field survey of critical bridges, <br /> a meeting shall be held with John Batka of the Colorado Division of Water Resources to present <br /> preliminary water surface profile modeling and inundation mapping and to discuss the critical bridges <br /> that have been identified as requiring field measurements. <br /> Inundation maps of the clear day failures of the three dams shall be overlaid on 1-meter resolution <br /> aerial photography. D&A currently has a digital National Agricultural Imagery Program(NAIP) <br /> mosaic of all of Larimer and Weld Counties. The NAIP mosaic consists of aerial photos of quarter <br /> quadrangles that were acquired with a precision aerial mapping camera in 2009. <br /> DELIVERABLES <br /> The deliverables for this project shall include a letter report for the inundation mapping analysis <br /> (stamped by a Colorado P.E.), 10 hard copies of the inundation maps, and 2 CDs containing: digital <br /> files of the inundation limits that are compatible with ESRI ARCView software, PDF file of the <br /> inundation maps, and supporting spreadsheets and hydraulic/hydrologic models. <br /> SCHEDULE <br /> Work on this project will begin in January 2012 with delivery of the final product no later than May <br /> 15, 2012. <br /> COST <br /> Assuming that the inundation mapping does not extend downstream of the limits discussed for each of <br /> the six dams, the estimated cost for completing these task items is $54,100. This estimate is <br /> summarized in the attached Table 1. The work shall be performed on an hourly basis for services <br /> rendered with a not-to-exceed fee of$54,100. In the event that additional services are requested, the <br /> Company shall be advised of the additional cost for such services prior to performance of the work. <br /> Invoices shall be submitted on a monthly basis. <br />