Findling, Inc. was retained to provide geotechnical engineering services for the design of the Masonville DMCF at the Masonville Marine Terminal. The project consists of designing a containment facility for placement of dredge material from the Baltimore Inner Harbor area. The proposed facility consists of an earth embankment (dike) about 5,000 feet long to be built in the Middle Branch Patapsco River between the existing Masonville Terminal and the Ferry Bar Channel, i.e. extending about 1000 feet into the river. The dike was designed to a maximum height of El. +42 over an area of about 116 acres to provide a design storage capacity of about 16 million cubic yards of dredge material.
In addition to design of the earth embankment Findling evaluated the subsurface condition within the footprint of the perimeter dike to identify a source of soil for earth dike construction and increase storage capacity and evaluated the permeability of the proposed dike section for seepage analysis.
Initially the dike was to be constructed to El. +10 with on-site soil then raised to El. +42, using reclaimed dredge material within the facility. Initially 5 dike alignment options were considered and after an initial evaluation of subsurface conditions one alignment was selected for final design.
Another aspect of the project, included relocation of a 48 inch water line between Fort McHenry and the Masonville Terminal which passes under the proposed containment facility. Findling provided geotechnical engineering services associated with the water line relocation.
The services Findling, Inc. provided for this project included:
- Subsurface Investigation on water and land.
- Insitu testing to evaluate strength parameter for dike foundation soils.
- Evaluate subsurface soil conditions within the footprint of the containment facility for use in dike construction.
- Design the Earth Embankment to a maximum height to El. +42 in stages over the life of the facility.
- Assist with preparation of specification for dike construction and dredging.
- Meet with MPA and Corp of Engineers to review design.
- Provide geotechnical design parameters for thrust block design, cofferdam and pipe line support for 48 in. water line relocation.