Projects

Bridge Resources, Payette, Idaho

Project Management

Centra served as the project engineering consultant and government relations firm for Bridge Resources, Inc. Duties included:

    1. Secured Conditional Use Permits for 14 wells site locations;
    2. Secured Drilling Permits through Idaho Department of Lands for 14 well locations;
    3. Secured permits for pipeline construction, including Idaho Transportation Department right of way encroachments, Payette River Crossing, railroad crossing and three canal crossings;
    4. Secured Conditional Use Permit for Gas Gathering and Compressor Station;
    5. Prepared Categorical Exclusion environmental assessments for drilling sites.

TASCO Industrial Wastewater System, Nampa, Idaho

CENTRA assisted The Amalgamated Sugar Company (TASCO) with operational oversight and guidance of industrial wastewater treatment at its Nampa, Idaho facility. This work consists of periodic in-situ monitoring of water quality parameters in the ponds, resulting in the following improvements: 
       1.  Dredging and temporary dewatering of one of the ponds to remove a floating biological mat which was hampering effective wastewater treatment in the system;
       2.  Installation of turbidity curtains, providing solids retention and reducing hydraulic shortcircuiting in the ponds;
       3.  Chemical additions to maintain an appropriate nutrient balance, control foam, and prevent odor formation;
       4.  Management of aerator operations to promote biological activity while reducing power consumption and minimizing heat loss during the winter months.

Idaho Waste Systems, Elmore County, Idaho 

Performed third party Construction Quality Assurance monitoring for the construction of Module 1E at the Idaho Waste System’s Simco Road Landfill. The project involved the installation of approximately 11 acres of 80 mil HDPE liner, geocomposite drainage layer, Geosynthetic Clay Layer and 3 feet operations layer. A double lined sump with bottom lined lysimeter were also constructed. 

Hidden Springs Sewer District, Hidden Springs, Idaho

Wastewater
CENTRA serves as project engineering consultant for the Hidden Springs development. Duties include:
        1. Consultation on wastewater land application reuse water rights issues;
        2. Preparation of the 2007 and 2008 annual reports to the Department of Environmental Quality for the wastewater reuse facility; 
        3. Preparations of plans for the wastewater reuse booster station. State approval of design was obtained.

Storm Water
Prepared the Storm Water Pollution Prevention Plan (SWPPP) for the expansion of the wastewater treatment plant and provided SWPPP implementation for Phases 6 and 8 of the Hidden Springs development.

Boise County, Idaho

Land Development
CENTRA serves as the Boise County Planning and Zoning consulting engineer. Staff reviews
plans and reports for development projects located within the County. Project work includes
representing the County at regular Planning and Zoning Commission meetings.

Solid Waste
CENTRA compiled Site Certification applications for Non-Municipal Waste facilities and
submitted to the Idaho Department of Environmental Quality and the Central District Health
Department. Certification was secured for the Horseshoe Bend Transfer Station, the Warm
Springs Ridge Transfer Station and the Garden Valley Transfer Station in Boise County.

Completed the design of the permanent landfill cover for the Warm Springs landfill closure.
Project work included the design of the landfill cover, permitting and storm water management
system design.

Black Rock Development, Kootenai County, Idaho

Project Management
CENTRA serves as the project engineering consultant for the Black Rock Development. Duties include:
       1. General consultation on potable water, wastewater and storm water and water rights issues;
       2. Preparation of the 2007 and 2008 annual reports to the Department of Environmental Quality for the wastewater reuse facility.
       3. Preparation and permitting for an emergency temporary land application system; and
       4. Drinking water compliance assistance.

Construction Storm Water Management
CENTRA advises the Black Rock development regarding construction storm water management oversight. Oversight includes interpretation of water quality sample reports, evaluation of Best Management Practices, and compliance assistance with Kootenai County and the U.S. Environmental Protection Agency. Project work also included the preparation of the site disturbance plans required for new projects.

Wastewater Reuse
CENTRA obtained approval from DEQ to temporarily add additional Hydraulic Management Units (HMUs) to the wastewater reuse system. Project work also included the preparation of the annual reports and the Project work also included the preparation of the Plan of Operations required under the land application permit.

Meridian Heights Water and Sewer District

Land Use Planning
CENTRA prepared the annexation application and supporting documents for the District’s annexation request to the City of Meridian.

Engineering Design
Ongoing engineering design work includes the preparation of plans and a bid package for a phased gravity wastewater bypass of the existing wastewater treatment system used by the Client. Permitting applications were prepared to the Army Corps of Engineers, Department of Environmental Quality, City of Meridian, Ada County Highway District and Nampa-Meridian Irrigation District. Project work also included the preparation of the Facility Plan and Preliminary Engineering Report for the gravity wastewater for review by the Department of Environmental Quality.

Wastewater Reuse
CENTRA provides engineering support for the wastewater reuse system used by the Meridian Heights Water and Sewer District. Project work has included the preparation of a Preliminary Engineering Report, a Preliminary Technical Report and Application for Wastewater Reuse Permit Renewal, Plan of Operations, and Annual Wastewater Reuse Site Performance Reports.

Southfork Landing Development, Garden Valley, Idaho

Wastewater
CENTRA prepared a wastewater discharge mixing zone analysis to support of the State Water Quality Certification for Special Resource Waters. The analysis was accepted by the Idaho Department of Environmental Quality.

Construction Storm Water Management
CENTRA provided weekly construction storm water management for Phase 1 of the development. Project work included compliance negotiations with the U.S. Environmental Protection Agency, the preparation of weekly status reports, periodic updating of the Storm Water Pollution Prevention Plan and preparation of Erosion and Sediment Control plans for new projects.

Valley County, Idaho

Solid Waste
Compiled Site Certification applications for Non-Municipal Waste facilities and submitted to the Idaho Department of Environmental Quality and the Central District Health Department. Certification was secured for the Valley County Landfill and Transfer Station in Valley County, Idaho.

Spill Prevention, Control and Countermeasures (SPCC) Plan
CENTRA prepared the SPCC Plan for the Valley County oil storage facilities.

 J.R. Simplot Company, Caldwell, Idaho

Spill Prevention, Control and Countermeasures (SPCC) Plan
CENTRA prepared the SPCC Plan for the Caldwell Potato Plant, which included eleven (11) functional oil management facilities. Project work included establishing environmental equivalence for various SPCC Rule requirements.

Gem County, Idaho

Spill Prevention, Control and Countermeasures (SPCC) Plan
CENTRA prepared the SPCC Plan for the Gem County oil storage facilities located at the County transfer station and road departments.

Agrium’s Rasmussen Valley Mine, Soda Springs, Idaho

Surface Water Management
Surface water control design for Agrium’s Conda Phosphate Operations Rasmussen Valley Mine located north of Soda Springs, Idaho. Project involved calculating run-on diversion ditches, haul road culvert sizing, temporary conveyance channels and pipes, and runoff collection and retention basins. Runoff was based on the storms from the 25-year, 24-hour to the 100-year, 24-hour events, depending on the use. Twenty drainage areas were analyzed ranging from 8 acres to 175 acres in size. Culverts under haul roads were designed to the 50-year storm event and stream crossings were designed to the 100-year runoff event. The analysis included a comparison of rainfall storm event runoff to snow melt peak discharge runoff. Stream crossings were designed to accommodate fish migration. One hundred percent of the runoff from the haul roads was collected and contained in retention basins designed with zero discharge through the 100-year, 24-hour storm event. A design for a springhead, which will be located under a waste dump stockpile, captured the flows and conveyed them in a pipe to the surface beyond the toe of the stockpile.

Robinson Nevada Mining Company, Ely, Nevada

Surface Water Management
CENTRA was asked to evaluate the feasibility of a 16,000 gpd surface discharge of dewatering flows. The analysis considered discharge to the existing capacity of surface waters and impacts of large underground drainage areas and storm events with recurrence intervals ranging from 2 to 100 years. CENTRA also performed evaluation of existing subsurface storm water drainage system to determine the handling capacity.

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