Control Surveys. Control surveys are those made to establish the horizontal and vertical positions of various points. The points are selected so that they form a net over the project site under consideration so as to provide a convenient method to tie planned improvement placement to these points. Methods used will involve GNSS and differing datums.
Control Surveys. Horizontal and Vertical corridor control will be established along the 6-mile corridor and will be tied into the North American Datum of 1983 (NAD83 NSRS 2007) and the North American Vertical Datum of 1988 (NAVD88). Existing monuments will be utilized where available and brass cap monuments will be set where no suitable monuments exist. Approximately two to three monuments per mile will be established with Caltrans 2nd order GPS methods, digital levels will be utilized to establish the vertical component. The GPS and digital level data will be downloaded, processed and adjusted. A final report will be prepared which will include a written report, the final adjusted coordinates, calculations and adjustment listings, and copies of the survey field notes. It is assumed that the survey control for this project was performed by Xxxxx Xxxxx & Associates (DEA) and will be provided by either DEA or the client. Psomas will verify the existing control and densify the control network using a combination of GPS and conventional methods. We will report the results of the verification survey prior to commencing any further survey work. Deliverables: Draft Survey Control Report Final Survey Control Report 185.10.60 ENGINEERING SURVEYS (INCLUDES DRAINAGE INLETS/OUTLETS, ETC.) Design topographic surveys will be performed as requested by the engineering team. Drainage features, bridge structures, walls, surface visible utilities and other surface visible structures will be located with field survey methods. The engineering surveys will utilize both conventional survey methods and 3D Laser Scanning (HDS) as described in 185.10.70. The method to be used will be determined by the survey team based on field conditions and the type of information requested from the engineering team. The topographic survey information will be downloaded, processed and plotted at a scale of 1”=50’ and will be incorporated with the aerial mapping obtained during the PA/ED phase. The final data will be delivered in a Microstation v8 format. Field surveys will be performed along the inside shoulders of the north and southbound I-215 freeway at 50-foot intervals to locate the existing edge of travelled way (ETW) at 1,500 feet/day. We will utilize reflectorless technology to perform this work in order to maintain safety and efficiency. If other methods are required, shoulder or lane closures may be required. However, it is our goal to perform this work without any closures. Psomas will survey and l...
Control Surveys. (WBS 12101) Xxxxxxx will recover primary control that was established for the Phase 1 improvements. From this primary control, additional survey control will be set for the engineering surveys and aerial mapping for the recently constructed Phase 1 improvements.
