Piscataway Creek Mitigation for Joint Base Andrews

The USACE Baltimore District hired Princeton Hydro and GreenVest to conduct a mitigation project at Piscataway Creek in Prince Georege’s County, Maryland. This project involved a mitigation site search, preliminary investigation, development of Phase I & II Wetland Mitigation Plans, a wetland delineation, development of an Evaluation of Planned Wetlands analysis, a Threatened and Endangered Species Assessment, a Cultural Resources Investigation, a hydrological and geotechnical evaluation of the site, development of a topographic and boundary survey, and a fixed price turnkey mitigation.

Our team was responsible for developing designs and specifications for the ecosystem restoration and mitigation aspects of the project, including but not limited to establishing appropriate design elevations for proposed vegetation communities, plant species selection, construction scheduling, sequencing and post-construction monitoring plans, and using USACE approved CADD and design software. The wetland mitigation is distributed across eight locations on the site. Wetland hydrology leverages the extensive drainage area tributary to the mitigation site inclusive of surface and groundwater resources. The mitigation site generated 12.5 non-tidal wetland mitigation units to offset 11.42 acres of permanent non-tidal wetland impacts. The mitigation project included the preservation of about 50 acres of high quality, non-tidal wetlands, the creation of 9 acres of non-tidal wetlands, and the restoration of 1 acre of non-tidal wetlands— for a total of about 62 acres of restored, preserved, and fully integrated non-tidal wetlands in the headwaters of Piscataway Creek.