TOPOGRAPHIC DATA COLLECTION. An aerial topographic survey will be conducted and presented at a planimetric scale of 1-inch = 40-feet, and a 1-foot contour interval for each of the shared-use / protected path segments included with the Project. Limits of the aerial topographic survey will extend longitudinally approximately 300-ft beyond each end of each shared-use / protected path segment and will extend approximately 50-ft laterally beyond the ROW limits. The planimetric aerial mapping will be prepared in conformance with National Map Accuracy Standards. Horizontal and vertical aerial control panels will be set to meet aerial triangulation requirements. Consultant shall supplement the aerial topographic map by performing an “as-needed” field survey to accurately locate surface features such as edge of pavement, berms, curbs, fences, walls, trees (greater than 3-inches or greater at breast height in landscaped or wooded areas), driveways, ramps, mailboxes, or other features within the shared-use / protected path Project areas. The supplemental field survey will locate surface utilities such as meters, valves, fire hydrants, power-poles, vaults, transformers, traffic signals, streetlights, manholes, storm drain culverts, or other surface utility. The supplemental field survey will include collection of cross-sections at 50-foot intervals in the shared-use / protected path Project areas and the Isolated Accessibility Enhancement route segments. Cross-sections will also be collected at existing driveway and intersection locations (as applicable). Cross-sections will include collection of field shots at street centerline/crown, painted edge-lines (as applicable), edge-of-pavement, top-of-berm and/or top-of-curb, gutter flowline, back of sidewalk, ROW, and at other observed change in grade (as applicable) within the existing ROW. Consultant shall collect and tie topographic data of man-made and/or natural features using a variety of City approved methods. These methods include but are not limited to collecting the data using terrestrial (Total Station), GNSS (RTK), 3D Laser Scanning (Mobile or Static), or station and offset. Consultant shall contact Oregon Utility Notification Center to request pre-survey utility locates and will keep the locate request number and ticket information within the Project file. Consultant shall record in the field notes the utility ownership, if available, when describing the line data points. Consultant shall record all visible utility identifications in the ...
TOPOGRAPHIC DATA COLLECTION. Task 1.1. General Data Collection XXX will coordinate with Lyon County and the Xxxxxx Water Subconservancy District (CWDS) to collect, organize, and review pertinent data, reports, and plans for the SADMP. Data may include, but will not be limited to: • Historical aerial photography • Historical topography • Geologic mapping • NRCS soils mapping • Photographs and video of documented flooding, erosion, and sedimentation • Drainage reports • Previous studies • Computer modeling • Land Use • Rainfall and stream gage records • NOAA Atlas 14 rainfall statistics
TOPOGRAPHIC DATA COLLECTION. Consultant shall locate horizontally and vertically, and depict all visible utilities and improvements within the R.OW. Vertical accuracy of the data shall be 0.10’ for natural ground, and 0.05’ or less for hard surfaces. Data collection to include, but not limited to, utility poles, utility pole guy anchors, water line features (valves, meters, hydrants and blow off valves), Wastewater and drainage structures (rim, invert, pipe size and pipe material, with the next upstream or downstream structure when located outside the mapping corridor), street signage and lighting, mailboxes, roadways (paved and unpaved), transformers, utility pedestals, pull boxes, driveways, driveway culverts and headwalls, planter and landscaped area limits, and trees over 4” in diameter with size and species noted.
