From strategic planning, conceptualization, financing, commissioning, and operation, our Wastewater Services Group has the expertise and experience necessary to successfully complete your project.
RPA's Wastewater Services Group is responsible for the design of wastewater collection and treatment systems. We have developed a productive relationship with the Montana Department of Environmental Quality (MDEQ) Water Quality Division, and the Environmental Protection Agency (EPA). The engineers in our wastewater group are well versed in DEQ compliance issues, having performed at least a dozen DEQ regulated projects in the last five years. Our technicians are familiar with the accepted standards the regulatory agencies require.
Because most of our firm's engineered wastewater projects have involved some share of public financing, RPA typically provides financial planning, applications, and administration services to municipal clients. In addition to design and construction inspection, combinations of funding sources are often involved, ranging from revenue bond issues to state or federal loans
Our wastewater team has provided planning reports, designed wastewater collection systems, treatment plants, lagoons, and sewage pumping stations for a variety of Montana communities.
SERVICES WE PROVIDE
Wastewater Collection, Treatment
East Helena Tertiary Filtration
East Helena, Montana
Client: City of East Helena, Montana
Robert Peccia & Associates (RPA) provided planning, funding, design, and construction phase services for construction of tertiary filters at the City’s wastewater treatment plant. The city’s discharge permit required them to meet some very stringent effluent metals limits; Copper ≤ 0.009 mg/l, Lead ≤ 0.003 mg/l, Zinc ≤ 0.012 mg/l.
As these limits are nearly 100 times less than that required in drinking water, it was difficult to find treatment equipment manufacturers with any applicable experience. Most manufactures had no experience treating down to these levels. Pilot testing was completed for several processes in order to determine what processes could achieve these limits and could also be successfully operated by the City of East Helena. The source of these metals are the residential and commercial plumbing systems within the City. Upflow media filters with continuous backwash were selected. These filters are also capable for phosphorus removal down to 0.3 mg/l. Four of these filters were installed in concrete tanks and are utilized as the flows received at the facility change seasonally. Six vertical turbine pumps lift the water to feed the filters. A combination of chemicals are fed upstream of the filters for pH adjustment and flocculation to allow the metals to be “filtered” from the effluent flow. Positive displacement pumps move sludge generated by the filters to the digester. Funding partners for this project included the Treasure State Endowment Program, DNRC Renewable Resources Grants and Loans, and USDA Rural Development.
Major aspects of the project included:
Miles City Headworks
Miles City, Montana
Client: City of Miles City, Montana
Robert Peccia & Associates (RPA) provided funding, design, and construction phase services for construction of new headworks at the City’s wastewater treatment plant. Prior to the project, the city’s only pre-treatment consisted of a manually cleaned bar screen. The project included construction of a new building that houses new screening and grit removal equipment. The capacity of this equipment is 2 Million-Gallons-Per-Day (daily average) and 6 Million-Gallons-Per-Day (peak).
Two lift stations collect all of the city’s wastewater and pump it to the treatment facility. A new mechanical screen removes objects greater than 1/4-inch and where they are washed, compacted, and dewatered for disposal. After screening the wastewater flows into the grit tank where velocities are created that settles grit particles while organic material remains suspended in the water. Grit is intermittently pumped from the bottom of the tank to a separator that decreased the water content before the decanter. The decanter allows settling with the overflow returned to the treatment process.
Major aspects of the project included:
Viking Lift Station Replacement
Client: City of Whitefish, Montana
This lift station included retrofitting existing wet wells and maintaining flows thru the existing lift station. The new lift station had to be constructed adjacent to the existing lift station to maintain flows and eliminate costly by-pass pumping. The lift station included two (2) 50 Hp submersible VFD pumps with pumping rates from 500 gpm to 1,000 gpm.
Key Project Elements:
Wolf Creek Wastewater Improvements
Wolf Creek, Montana
Client: Wolf Creek Water and Sewer District and Lewis and Clark County
Robert Peccia and Associates prepared a Preliminary Engineering Report (PER) to evaluate the options for providing a community wastewater collection and treatment system for Wolf Creek, MT. The community of Wolf Creek is comprised of small lots that do not afford the required space for a replacement drainfield and don't provide sufficient room to accommodate the required separation distance between septic systems and residential water wells. Most of the septic systems in Wolf Creek are 20 to 50 years old and are failing, or will require replacement in the near future. Residents with failing septic systems will be required to install individual level 2 treatment systems if a community wastewater system is not installed.
The PER evaluated both collection system alternatives and treatment alternatives. The collection system alternatives evaluated included large diameter gravity with removal or abandonment of all existing septic systems, small diameter gravity retaining existing septic tanks, and individual Septic Tank Effluent Pumping systems retaining the existing septic tanks. The selected alternative was the large diameter gravity main collection system, including the abandonment or removal of all existing septic systems.
The treatment alternatives evaluated included facultative lagoons with land application of the effluent, on-site SBR treatment with a drainfield, Membrane Bioreactor mechanical treatment, and Fixed Film mechanical treatment with surface water discharge of the treated effluent. The Fixed Film mechanical treatment was the selected alternative as it provided the most economical solution to the community's treatment needs. The Wolf Creek Water and Sewer District is currently seeking funding for the proposed improvements.