DEA has a long history of providing hydrographic and land surveying services to the Walla Walla District, including several surveys on the Columbia, Snake, and Clearwater Rivers.
DEA Marine Services performed hydrographic surveys of approximately 260 miles of the lower Mississippi River in support of NOAA Office of Coast Survey’s Precision Charting Initiative.
Since 2018, DEA Marine Services has provided hydrographic surveying and geoscientific consulting services as part of the Upper Columbia River Remedial Investigation and Feasibility Study.
DEA provided topographic and quantity surveys during shoreline rock excavation and overburden removal for installation of a Floating Surface Collector on Lake Shannon, WA. We also provided topographic surveys, construction staking, and as built surveys.
Since 2012, DEA has been providing civil engineering and surveying services to King County Housing Authority communities.