RFP Nature Park Stormwater Study

The Engineering Division of the City of Helena seeks the services of an engineering firm to provide services necessary to complete a study of the City of Helena’s Nature Park and the Cole Avenue Ditch for improvements to stormwater storage, treatment and conveyance. At the present time the City of Helena wishes to evaluate the existing Nature Park and Cole Ave Ditch stormwater system capabilities which conveys and provides partial treatment for the downtown area along with considering recommendations for implementation of a storage pond for at a minimum water quality treatment. The project will entail completion of an in-depth soil and groundwater study to determine potential implications to the groundwater table within downgradient properties, along with a study of the existing outfall system to determine what upgrades would be required downstream of the pond to reduce flood risk for properties along Cole Ave. Design recommendations will need to consider a controlled release structure with adequate emergency overflow and retainage of an existing infiltration gallery used to route water for treatment of VOCs in the aeration ponds at the City golf course. Final Scope of work and deliverables will be determined during final negotiations with selected firm, at a minimum selected firm will be required to provide overall project management, study of existing system/relevant existing data such as the current stormwater master plan, alternatives design analysis and environmental analysis along with any additional work to support conceptual designs such as topo and encroachment surveys and geotechnical studies.