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1.3e. The Contractor shall provide one (1) set of black and white contact prtnts of the aertal photography. All contact prints shall be made on double weight paper with semi-matte finish. Contact prints shall be delivered flat and trtmmed on all sides with the fiducial marks retained. I.3f. Upon completion of the mapping data and acceptance by the CWCB Project Manager, the Contractor shall retain all backup data that was generated to produce the mapping until requested by the CWCB. The backup data shall include, but not be Himited to, ortginal aertal film, diapositives, manuscrtpts, negatives, control photos, aerotrtangulation computations, field books and all other matertal not previously delivered. 1.4 Topographic Mapping: The topographic mapping for the two project areas shall be produced using existing U.S.G.S. hortzontal and vertical control and/or Geopositioning Survey. I.4a. In the event there is more imagery than is required in the area delineated, the Contractor shall extend it to the limits of the required mapping area of the final design files. Each design file shall include a small key index showing the relative location of each sheet within the overall project area. The final images shall have a uniform color tone density, and a degree of contrast which will cause all details to show clearly in the dark tone areas and in the high, as well as in the half-tone, between dark and high light. 1.5. CADD Files: All digital mapping data shall be provided as Auto Cadd Release 12 digital files. Limited planimetrtcs to include edge of water features, buildings, fences, trees, and roads are required. The design files shall comply with the discipline specific provisions for drawing file layer assignments as specified by the latest version of the Tri-Service A/E/C Cadd standards (available at http://tsc.wes.mi1) Auto Cadd files shall also comply with methods and quality of workmanship such as line colors, line weights, and line types to permit satisfactory, clear and legible reproduction at 1/2 scale. Lettertng on the drawings shall not be smaller than 1/8" actual size. Layertng of topographic, and spot elevation data shall be edited to eliminate overlapping of data. The Contractor shall deliver one(I) sets of Auto Cadd files on 3.5" high density floppy disks. 2. GENERAL REQUIREMENTS: 2.1 Field Control Surveys: Field surveys to establish photo control points shall ortginate from 1st, 2nd, or 3rd order control established by NGS, USGS or Corps of Engineers. Geopositioning Survey (GPS) may be utilized to establish ground control. The ground control coordinates shall be based on the UTM Coordinate System, Zone _ and NAD 83 (1988). Modified coordinate grtd system may be used. Elevations shall be based on NGVD-88. Any questions or problems conceming vertical datum and grid system shall be coordinated with Tom Browning, at 303-866-3441 prtor to commencement of field work. Upon successful completion of aertal photography, the Contractor shall remove panels. Panel points (rebar and cap) shall be retained.