Brighton/Hammer and Tucson/Rogers Gravel Pit Reservoirs, Adams County, Colorado

RJH and ERO Resources Corporation (ERO) were retained by the City of Thornton (City) and are working in conjunction as part of the project team for the Brighton/Hammer Gravel Pit Reservoir (Brighton/Hammer) and Tucson/Rodgers Gravel Pit Reservoir (Tucson/Rodgers) projects.  RJH is serving as the Lead Design Engineer for the conceptual and final designs and ERO is providing environmental permitting support.  These projects involve the conversion of the Brighton/Hammer and Tucson/Rodgers gravel pits to water storage reservoirs.  Final design features at each reservoir will include a 100 cfs (65 MGD) capacity pump station and wet well, conveyance pipelines to drain and fill the reservoir, and an inlet/outlet structure on the South Platte River.

During the mining and reclamation phases of both gravel pits, the City obtained agreements with the miner to purchase the gravel pits following the completion of reclamation activities.  RJH provided technical review of reclamation plans during this time  to ensure the facilities were constructed in substantial conformance to the City’s design criteria and purchase agreements.  Technical review components included slurry walls, reclamation slopes, stability analyses, spillways, surface water management facilities, surveying, utilities, and drawings and specifications.

Engineering services provided by RJH include:

  • Evaluation of alternatives for filling and draining the reservoirs.
  • Hydraulic analyses to design the pumps, pipelines, and other ancillary hydraulic facilities.
  • Civil, structural, and geotechnical analyses to design the wet wells, pump station and electrical control buildings, and river inlet/outlet structures.
  • Geotechnical investigations for pump station locations.
  • Development of construction drawings and specifications.
  • Development of opinion of probable construction costs.

Environmental permitting services provided by ERO include:

  • Evaluation and assessment of potentially classified wetlands.
  • Coordination with the U.S. Army Corps of Engineers (USACE) regarding the needs and requirements for the USACE 404 permit.
  • Preparation of USACE 404 Individual Permits.
  • Habitat assessment for federally listed threatened and endangered species.