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<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.
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<br />Proposed Scolle of Work
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<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,
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<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),
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<br />The scope of work is as follows:
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<br />1) Obtain access to data from City of Colorado Springs (to be done before project startup)
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<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 resolJltion, 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.
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<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 colIections in both digital and photo-rectified
<br />coverages, and copies of stereo pairs.
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<br />We understand that many of these data are proprietary and may only be used at City facilities,
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<br />2) Gather pertinent, pre-existing geological information (10% of project funding)
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<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,
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<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 CarrolI, in prep,), Other sources of geologic information
<br />may include current CGS mapping in the area, the CGS archives, City agencies, area colIeges
<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.
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