Southern California Metropolitan Water District, On-Call Surveying and Mapping
Under an on-call contract with the Metropolitan Water District (MWD) of Southern California, DEA provided boundary services, control surveys, construction surveying (including large-diameter pipelines and tunnels), potholing, right-of-way and title mapping, data management and distribution, mapping reviews for compliance with requirements, and various programming and application development techniques. DEA completed several projects under this contract, including:
- Colorado River Aqueduct
DEA performed global positioning system (GPS) and conventional surveying for a 120-mile portion of the 60-year-old Colorado River Aqueduct. DEA surveyors located cracks in the aqueduct that needed to be repaired or rehabilitated.
- Riverside County Property Boundary Surveys
These boundary surveys required public lands retracement and analysis, the setting of missing monuments, and the preparation of records of survey. Special staff training was needed, because several sites were located in environmentally sensitive zones. Planning and coordination with MWD staff was critical to control the schedule and cost, because many sites were located in remote areas.
- Infrastructure Control Program
DEA provided GPS surveying for various feeders throughout Los Angeles, San Bernardino, and Riverside counties. Using GPS and conventional methods, DEA surveyors located horizontal points of intersection (PI) along the feeders and established state plane coordinates tied to MWD’s North American Datum of 1983. From these PI positions and record information, DEA computed feeder alignment in conformance with MWD procedures and guidelines.