HWC completed the design of the Western Regional Interceptor which resulted from a master planning effort completed in conjunction with an IDEM-mandated compliance plan. The proposed project includes a new regional interceptor for the western sanitary sewer service area for the City of Greenwood. The interceptor will collect flow from White River Township via gravity to relieve the City’s existing interceptors in the old downtown area and east side which are currently at capacity and experience surcharging and overflows. The proposed interceptor runs from SR 135 at the southeast end to SR 37 to the northwest. It generally follows Turkey Pen Creek and Honey Creek and runs adjacent to or in between several subdivisions which have experienced significant growth over the last 25 years. The proposed interceptor connects to Citizen Energy Group’s existing 102” diameter South Marion County Regional Interceptor.
Based on economic development and utility planning studies completed by HWC, Clinton County retained HWC to complete design and construction phase services of the recommended project for wastewater and water utilities on I-65 and SR 28. This project included new wastewater collection and water supply facilities to serve existing and potential development near the I-65/SR 28 interchange, as well as unincorporated areas along the SR 28 corridor, west of the City of Frankfort and west of CR 450. No public water or wastewater facilities existed in the project area. The scope of work for the project included approximately 10,000’ of gravity sewers (ranging in size from 8” to 15”), two lift stations, approximately 4,000’ of dual 6” and 8” force mains, approximately 18,000’ of dual 8” and 12” force mains, approximately 24,000’ of 18” water main with associated hydrants and valves, four crossings of SR 28 via jack and bore, and an automatic flushing station to maintain water quality. The water and wastewater facilities were connected to the City of Frankfort’s systems and wastewater treatment for the wastewater collection system to be provided by the City of Frankfort. The project was completed in the summer of 2021 with an overall project cost of $15 million.
HWC Engineering provided design and construction inspection services for a $2.0 million phosphorus removal project for the 24 MGD wastewater treatment plant in Terre Haute, Indiana.
As a result of new effluent limits imposed on the WWTP by the NPDES permit, HWC also completed a compliance plan to identify the needed facilities. HWC was responsible for the design of the chemical feed system and improvements to the anoxic system for biological phosphorus removal. Work included 30” diameter anoxic piping and tank modifications, as well as the addition of chemical storage tanks, feed pumps, feed piping, and building renovations.
Additionally, HWC provided construction administration assistance, serving as the primary contact with the owner for the State revolving fund to provide project financing.
This project consisted of the planning, design, and construction phases for the Michigan Road Wastewater Treatment Plant Expansion. The planning phase created a master plan to allow up to 12 MGD treatment capacity on the existing plant site for this fast growing area northwest of Indianapolis in Hamilton County, west of Carmel, and east of Zionsville.
The $7.5 million project called for design of a 1.5 MGD plant expansion for a average design plant capacity of 2.55 MGD. The design incorporated a new state-of-the-art preliminary treatment building with odor control, vertical loop reactors to handle peak flows experienced by the District, a secondary clarifier, a return activated sludge pumping station, chemical feed system, solids handling improvements, a UV disinfection system, and post aeration. The 3 existing secondary clarifiers were retrofitted with effluent launder covers and the weirs were modified after they were found to be out of level during the planning phase. The project underwent a staggered construction sequence to facilitate the plant’s need to remain completely in service while the new facilities were constructed.
As mentioned the District service area is experiencing rapid growth and to accommodate this rapid growth strong emphasis was put into the expandability of each structure/process with many sized for the next expansion of another 1.5 MGD.
New Wastewater Treatment Plant, Lift Station & Collection System Improvements
HWC directed this project to relieve the city of Greencastle from a sewer connection ban, helping to open the new Veteran’s Memorial Highway for new economic development, and allowing the construction of a new senior citizens center and the new Putnam County Jail.
Project Highlights:
Project cost – $12.5 million
Over 5,000’ of 36” gravity sewer constructed
3 lift stations constructed
First Vertical Loop Reactor type of treatment facility to receive a construction permit in the state of Indiana
Received Merit Award from Indiana Chapter of ACEC
Plant can handle peak, wet weather flows, with documented increases of flow from 1.8 MGD to 14 MGD in a 24-hour period receiving full treatment with no bypasses or overflows
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