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<br />. <br /> <br />. <br /> <br />and homeowners, and other general-public uses. Its digital format will allow for use and distribution in <br />various GIS and internet applications. A hard-copy version of the map will be published and made <br />available to the public by the CGS, subsequent to this project. <br /> <br />Proposed Scolle of Work <br /> <br />The CGS proposes to make the Landslide Hazards Map compatible with the City's GIS map database. <br />We propose to assess and re-map all information from digital 1041 maps that relates to known landslides <br />and potential landslide and slope stability hazards, as new GIS layers. These new map layers will be <br />modified, if necessary, by comparing and incorporating geologic information from existing, public-record <br />maps and reports, checking the information on existing air photos, and analyzing high-resolution slope <br />classification GIS maps of the project area. During the course of the study, we will check and verify the <br />mapping by conducting field reconnaissance visits to different areas of Colorado Springs. <br /> <br />Two GIS map layers will be created: 1) areas of known landslides that have either undergone recent (i.e., <br />historical) movement or exhibit a relatively distinct landslide-related topography, and 2) areas that are <br />susceptible to landslides because of geologic and topographic similarities with known landslide areas (i.e" <br />potentially unstable slopes). <br /> <br />The scope of work is as follows: <br /> <br />1) Obtain access to data from City of Colorado Springs (to be done before project startup) <br /> <br />We will need to have access to a GIS workstation in the City Planning office so that we can <br />work on a digital base map. We will need access to digital topographic data at a 2-foot <br />contour resol1.ltion, along with cultural and natural-feature coverages. City GIS staffwiII <br />assist CGS staff in generating slope classification coverages from the FIMS data in slope- <br />angle increments specified by CGS. <br /> <br />We will need to have access to air photos from the FIMS library, the Colorado Springs Office <br />of Emergency Management, and other City coIlections in both digital and photo-rectified <br />coverages, and copies of stereo pairs. <br /> <br />We understand that many of these data are proprietary and may only be used at City facilities. <br /> <br />2) Gather pertinent, pre-existing geological information (10% of project funding) <br /> <br />The CGS has recently paid for the digitization and edge-matching of the 1041 maps from the <br />Cascade, Pikeview, Falcon NW, Manitou Springs, Colorado Springs, Elsmere, and Cheyenne <br />Mountain 1 inch = 2,000-foot scale quadrangles. The CGS has submitted this newly digitized <br />information to the City Planning GIS staff. This wiII be the main source of data. <br /> <br />The CGS will gather additional, pre-existing geological information that is readily obtainable, <br />including public-record maps and reports. The main sources will be the older, regional-scale <br />geologic maps from USGS (Scott and Wobus, 1973; Trimble and Machette, 1979) and the <br />recent geologic maps of the Colorado Springs and Pikeview quadrangles by the CGS (Carroll <br />and Crawford, 2001; Thorson and CarroIl, in prep.). Other sources of geologic information <br />may include current CGS mapping in the area, the CGS archives, City agencies, area coIleges <br />and universities, and developers or their consultants. Because of limitations in funding and <br />scope of work, it is unlikely that we will be able to locate or obtain all pre-existing maps and <br />reports for any particular area. <br /> <br />2 <br />