Wastewater / Planning
HoJo Pump Station & Gravity Sewer Evaluation / Bloomington, Illinois
The City of Bloomington has a small service area that is currently served by the HoJo Pump Station. This pump station is in need of significant upgrades if it is to remain in service. The City also has an abandoned 12” force main extending to this pump station that potentially could be re-purposed as a gravity sewer, thus eliminating the HoJo Pump Station. We were hired evaluate three options: 1) upgrade the HoJo Pump Station, 2) convert the 12” force main to a gravity sewer, and 3) install a new gravity sewer.
Since the force main has been out of service for some time, the scope of work included performing an internal TV inspection of the main. Invert elevations were also obtained at key locations to verify pipe slope. The force main extends across the I-55/I-74 interchange, so coordination with IDOT was required for access on the interstate R.O.W. A report was prepared detailing the findings of the internal inspection as well as comparing cost estimates for each of the alternatives.
Wastewater Treatment Facilities Planning Study / Hopedale, Illinois
Maurer-Stutz, Inc. was retained by the Village of Hopedale to conduct a comprehensive study and analysis of its existing wastewater treatment facilities. The study was deemed necessary by the IEPA as part of a Compliance Commitment Agreement (CCA) between the Agency and the Village to bring the Village’s facilities into full compliance with existing regulatory requirements. In the long run the study’s purpose was to identify and analyze alternatives to upgrade the facility to increase its flexibility to accommodate reasonably anticipated future regulatory requirements for NO3 and P reduction as well as growth in the region.
Major improvements and modifications to the main WWTP’s remaining existing treatment facilities to increase operational efficiency and reduce lifecycle costs. Increased treatment capacity in terms of both hydraulic and biological loading, increased flexibility of operation, increased capability to meet reasonably anticipated future regulatory requirements for nutrient removal (NO3 and P) and reduced lifecycle costs due to efficient treatment process design and modifications.
LONG TERM CONTROL PLAN / CANTON, ILLINOIS
The City of Canton began the update of their Long Term Control Plan as requested by the Illinois Environmental Protection Agency. As part of the update, all wastewater collection facilities including structures and sanitary, combined, and storm sewers of various sizes and material types were to be inspected and documented as part of the system characterization component of the plan. Furthermore, flow monitoring, stream sampling, wet weather sampling, and hydraulic modeling were performed to verify that the existing wastewater collection and treatment systems were adequately sized to minimize combined sewer overflows at three permitted locations. Both federal and state guidelines were used in this study and subsequent report. Extensive coordination with the main and local offices of the IEPA was also performed.
Overall, the project consisted of the inspection of over 3,200 manholes and over 7,800 pipe connections within the sanitary sewer network. Thirty-four pieces of hydraulic monitoring equipment including flow meters, level monitors, and rain gauges were installed, maintained, and monitored for nearly two years.
LONG TERM CONTROL PLAN / PEORIA, ILLINOIS
As mandated by USEPA, the City of Peoria was required to develop a Long Term Control Plan (LTCP). The City contracted a consulting team to perform the necessary work and complete the LTCP document. The initial phases of the planning effort included flow monitoring at 33 sewer locations, sampling at 12 sewer locations, and sampling at 4 transects on the Illinois River. The data collected along with physical characterization of the collection system facilitated modeling efforts to generate various scenarios for evaluation.
Over 30 alternatives were evaluated for feasibility and cost effectiveness. Sensitive area considerations played a significant role in the evaluation as well as the location of potential City developments. The recommended plan, which is still being negotiated with USEPA, calls for 4 remote store/treat basins with connecting sewers. The estimated project cost is approximately $100,000,000.