Client

Maryland Department of Transportation State Highway Administration (MDOT SHA)

Key Services

  • Geomorphic Assessment
  • Hydrology
  • Wetland Delineation
  • Forest Stand Delineation and Specimen Tree Survey
  • Construction Inspection
  • Agency Coordination

Project Details

Coastal Resources, Inc. (CRI) provided geomorphic and natural resource assessment and construction inspection services as a subconsulant on this stream restoration project undertaken as part of the Maryland State Highway Administration’s Total Maximum Daily Load (TMDL) improvement program.  The project, located in the Potomac River watershed in Hancock, Maryland, is aimed to reduce sediment and nutrient discharges through floodplain reconnection, stream bank and channel stabilization, riparian zone plantings and wetland enhancements, and invasive species treatments.

CRI performed a detailed geomorphic evaluation and bank stability analysis for the restoration stream reach of approximately 2,500 LF, including longitudinal profile; channel cross sections; pebble counts; bulk sample; bank material, including vegetation (BANCS); geometry (sinuosity, radius of curvature); site sketch; reporting;  and data analyses. In addition, CRI prepared the existing hydrology for key study points using a combination of TR-20, regional regression estimate, and gage data. Estimates included: baseflow, 1-yr, 2-yr, 5-yr, 10-yr and 100-yr discharge. CRI also assisted with the TMDL crediting calculations for the project.  A write up of the analysis and results was provided to the prime consultant for inclusion in the design report/memo.

All waters of the U.S., including wetlands, within the project study area were delineated in accordance with the Eastern Mountains and Piedmont Supplement to the 1987 USACE wetland delineation manual and a wetland delineation memo, including mapping, was prepared documenting the findings.

A forest stand delineation and specimen tree survey were also conducted within the project study area in accordance with the Maryland Department of Natural Resources (MDNR) State Forest Conservation Technical Manual (MDNR 1997).  Forest stand boundaries were delineated, and all forest stands were characterized using the plot sample method.  Data was collected at each plot locations, two per forest stand, and at least one stand per four acres of forest, in accordance with the Technical Manual.  Plot locations were randomly selected within each stand and were surveyed using a handheld Trimble GPS unit.  All specimen trees were measured using a diameter at breast height (DBH) tape at 4.5 feet above the ground.  The species, size, and condition of all identified specimen trees were recorded and their locations were surveyed using a handheld Trimble GPS unit.  CRI prepared and submitted the Forest Conservation Exemption Application for approval by MDNR.

During construction, CRI provided Designated Specialist (DS) services to ensure that the project was constructed in accordance with the design. Services included on-site inspection including daily site reviews of on-going construction activities related to floodplain and stream construction. The contractor’s activities were reviewed daily to determine if they met the design intent of the contract bid documents including approved plans and construction specifications.  Inspection included review of the placement of in-stream structures, grading operations and placement of bioengineering material. Written daily logs and photo-documentation of construction and inspection activities were completed. The CRI DS coordinated with SHA personnel and/or the contractor daily to follow-up on items pertaining to the stream and floodplain construction until they were completed.