DW Smith Associates routinely performs a GPS survey of the existing control used to do any preliminary work and supplements the base control with additional locations as necessary utilizing a combination of Real Time Kinematic (RTK) and Static GPS survey methods. Existing monument recovery is performed along the route to establish the existing baseline stationing and confirm right-of-way locations. Where the proposed route crosses multiple jurisdictions, a survey project kick off meeting is held to discuss the survey approach and identify the critical control monuments necessary to document the location of the existing baseline geometries. Once all monuments have been recovered, they are incorporated into the control survey network creating a homogeneous network of control points for the design and future construction of the transportation facility/project. GPS and conventional survey control (traverse) is documented in the form of a survey control report. Each of the traverse points are short tied with a minimum of three distances to aid in quick recovery of the control points.
Right-of-Way – DW Smith performs route surveys, right-of-way surveys and asbuilt topographic surveys along high volume corridors routinely. As such, DW Smith collects roadway cross section data at critical tie in points along proposed ramps and parallel to proposed roadway widening(s). When there are multiple agencies involved on a project with jurisdictional overlap, DW Smith obtains Highway Occupancy Permits from the New Jersey Department of Transportation or other local (NJTPA) as required. DW Smith has extensive experience obtaining the Traffic Permits necessary to do survey work along the Garden State Parkway / NJ Turnpike Authority & New Jersey Department of Transportation (NJDOT). Projects with heavy volumes of traffic may warrant the use of Maintenance and Protection of Traffic (MPT) equipment. When practical, Terrestrial Laser Scanning technology is used by DW Smith survey crews to collect data alongside busy highways without the need to close down lanes. Shoulder closings and lane closings may be necessary at times to collect the survey data in a safe but practical manner when laser scanning is not practical.
Utility Asbuilts – DW Smith asbuilts all evidence of existing above and below ground utility lines along proposed route corridors. Utility lines typically include storm drainage grates and inverts along with sanitary sewer rims and inverts.
Pipe size and pipe material data is gathered and shown on the base maps. Where existing utility line data is available, DW Smith survey crews will confirm the rims and manhole inverts. Gas lines, water lines, electric and telephone lines along with utility line mark outs are located and shown where evidence exists. Highway lighting can also be critical in areas where the existing lighting will be relocated.
Mapping – DW Smith incorporates all of the survey data in to the existing base maps and returns the revised base map Cad files in their native (Autocad or Microstation) format. Existing contour files are also reviewed and revised in the areas where accurate field survey data is collected. The field survey data is then merged into the Digital Terrain Model. DW Smith delivers copies of all field notes, raw data collection files, ASCII files along with the Cad files created for the design project team.