Lompa Ranch Flood Volume Mitigation and Channel Restoration
The Butti Way Channel Restoration Project, situated along Kings Canyon Creek in Carson City, Nevada, aims to restore the natural hydrological function of the creek’s overbanks. This initiative responds to previous infrastructure developments, including a wastewater treatment plant and utility installations. The project’s goal is to enhance floodplain connectivity and storage capacity, thereby supporting flood management efforts for the upstream Lompa Ranch East development, which involves compensatory floodplain storage to offset floodplain displacement from construction activities.
Scope of Services
Terraphase provided comprehensive permitting support for the adjacent Lompa Ranch East development, ensuring compliance with Sections 401 and 404 of the Clean Water Act and securing the Working in Waterways permit. Terraphase refined channel restoration design plans to enhance floodplain connectivity and ecological function. The team utilized advanced hydraulic modeling to analyze and optimize the design modifications, including integration of concrete weirs and optimized berm placements. Additionally, a wetlands delineation was conducted within the channel restoration area to confirm that federal permitting for the impacts to Waters of the U.S. would not be required.
Notable Accomplishments
- Informed design modifications to meet both flood management and habitat restoration goals
- Conducted wetlands delineation to guide restoration planning and protect sensitive wetland areas
- Integrated technical modeling and regulatory guidance to balance ecological and engineering priorities
San Leandro Treatment Wetlands Design
This project includes technical studies, environmental planning, draft and final engineering design, regulatory permitting, and construction management services in San Leandro, California. The goal of the project was to develop an innovative 7-acre treatment wetland suitable for polishing approximately 1 million gallons of treated wastewater effluent per day. The treatment wetland will reduce loading of nutrients (nitrogen) and micro-organics to the San Francisco Bay while generating significant habitat benefits, in addition to improved aesthetics and educational opportunities for a site adjacent to the Bay Trail.
Scope of Services
Terraphase designed the 7-acre constructed wetland system and an innovative version of an ecotone levee for water quality improvement. Efforts involved successfully applying for a $570,000 Measure AA grant, seeking community input to develop a specific project, and working with the design team to create a project that reflects community preference. The project involved workshops early in the design phase to solicit input from a city that meets California’s definition of a Disadvantaged Community.
Notable Accomplishments
- Designed 7-acre treatment wetland and ecotone levee
- Secured $570,000 Measure AA grant funding
- Involved consultation with the Bay Restoration Regulatory Integration Team, the San Francisco Regional Water Quality Control Board, and other regulators
Former Naval Fuel Depot Point Molate Mitigation Wetland Design
Terraphase provided design and construction oversight for a 0.5-acre mitigation wetland at the former Point Molate Naval Fuel Depot in Richmond, California. The project aimed to restore seasonal wetland habitat to offset site-related impacts and support long-term ecological function in an upland area.
Scope of Services
Terraphase prepared both draft and final construction design documents and managed all phases of construction implementation. The team coordinated with resource agencies, developed drainage infrastructure, and oversaw activities including site preparation, earthwork, installation of drainage controls, seeding, planting, and fencing. The objective was to create a rainwater-fed seasonal wetland dominated by native hydrophytic vegetation and shallow surface ponding that would thrive within five years of construction. Ongoing monitoring has confirmed successful wetland establishment. The project included quality control reviews of the wetland design and construction, and the habitat mitigation monitoring plan.
Notable Accomplishments:
- Coordinated with resource agencies and project partners
- Implemented drainage controls for seasonal water retention
- Verified successful wetland establishment through monitoring
