Infrastructure improvements to address significant sinkholes as a result of poor storm drainage and sanitary sewer line condition.
MWWTP Electrical Supply Reliability Improvements as needed.
This project is for providing Program Management services related to the City’s Clean Water 2020 Consent Decree Compliance and Infrastructure Improvements Program. This initiative provides a framework for supporting a number of areas including development of the program, implementing the program, complying with CD monitoring and reporting requirements, providing technical support and oversight, providing coordination and oversight of design consultants and construction contractors, and supporting the City with facility and collection system O&M assistance. This project is considered to be a capital expense due to the majority of fee being expended in support of the City’s Capital Improvement Program (CIP) projects.
Resolve utility conflicts on an as needed basis and use this CIP as the funding source.
This project consists of the installation of a new 36-inch diameter gravity relief sewer in the Lower Gills Creek system for a distance of 6,500 linear feet. The new pipe will generally run adjacent to the existing 48-inch pipe that runs along a cross-country easement (and under a railroad) from Tall Pines Circle to Bluff Road in the Gills Creek Basin. The project also includes relocation of a portion of the existing 48-inch pipe that is within a contaminated site. The project is a second phase project in the Gills Creek area in conjunction with the Lake Katherine area sewer improvements to avoid SSOs.
New gravity sewer service to 7401 Richard St (Atlas Rd).
I-126 (Elmwood Ave) Bridge Sewer Relocation.
Relocation of approximately 1100 LF of 8-inch gravity sewer, 200LF of 2-inch sewer force main, along with multiple lateral lines, and manhole adjustments.
The purpose of this project is to provide technical engineering, administrative, and construction phase support to the City of Columbia for find-and-fix rehabilitation of a portion of the City’s sanitary sewer system. Rehabilitation efforts are intended to identify and correct problems that may lead to sanitary sewer overflows (SSOs) through structural, operations and maintenance, and infiltration and inflow (I/I) related defects of City assets. The intent of this project is to meet the requirements of the Continuing Sewer Assessment Program (CSAP) and the Infrastructure Rehabilitation Program (IRP) which are components of the Consent Decree under which the City is performing this work.
Technical consulting support to the City of Columbia (CITY) for a water main and sewer line relocation project around a roadway improvement project, including utility coordination, evaluation of alternative alignments, engineering and design, and construction phase services for the project. Scope of this work is assumed to include the relocation of approximately 1,600 linear feet of 6-inch water main and 250 linear feet of 21-inch gravity sewer with upgrade to 36-inch. It is assumed that the 8-inch gravity sewer line will remain in place and this scope includes connection to the new 36-inch gravity main, protection measures, and adjustment of manhole rims as required. This scope of work also includes design of permanent maintenance access points on the north and south sides of the roadway to the 36-inch sewer line.
This project proposes a 36-inch diameter extension of the existing Saluda River Force Main in order to relocate the force main outfall into the City’s gravity sewer system. The proposed force main will be revised to extend from its current outfall at Manhole 25109MH on the north side of the Saluda River to a new outfall location at 25213MH, located on the south side of the Saluda River. The force main will extend for approximately 3,500 linear feet; the exact length required shall be verified by the Consultant and coordinated with the City and CW2020.
Sewer relocation projects around the widening of Leesburg Road from near Fairmont Road to near Lower Richland Boulevard for approximately 3.9 miles.
New sludge thickening facilities will be designed to consolidate PS + WAS thickening from both liquid process trains and to accommodate the Metro WWTP’s current 60 mgd design flow rating with flexibility for future expansion to 80 mgd.
As part of the City’s Capacity Assurance Program (CAP) required under the EPA’s May 2014 Consent Decree, the City of Columbia has evaluated collection system capacity to convey the projected future flow in the Crane Creek sewer basin from 2020 through full buildout of the sewer basin. Based on simulations using the Hydraulic Model, the results suggest that the existing Crane Creek trunk sewer, North Columbia Pump Station, and Rocky Branch/Congaree outfall trunk sewer cannot properly convey peak 2-year storm event wet-weather flows, as required by the Consent Decree, beginning with the 2020 planning period. The City is proposing the construction of an 8 million-gallon (MG) equalization storage tank and a corresponding Crane Creek Storage Pump Station (CCSPS) with a flow rate capacity of 25 million gallons per day (mgd) to address immediate 2020 system capacity deficiencies for the Crane Creek basin. The storage tank and pump station will be constructed on City property at the Old Eau Claire Wastewater Treatment Facility, which is located near the confluence of the Smith Branch and Crane Creek trunk sewers.
This project proposes a permanent storage and feed system for magnesium hydroxide slurry for treatment Train 2 at the Metro WWTP. Currently, Train 2 has a temporary magnesium hydroxide chemical feed system which provides supplemental alkalinity to support the nitrification process. The system shall be a standalone system to operate within a range to effectively supplement alkalinity using magnesium hydroxide slurry to accommodate fluctuations in nitrogen and alkalinity plant loading. Since the 2015 PER, the CITY has implemented a magnesium hydroxide feed program in the collection system for odor control which may influence supplement feed requirements and operational ranges for Train 2. The 2015 PER is also currently being updated, and the process recommendations in the PER Update may also impact alkalinity feed requirements in both Train 1 and Train 2.
This project consists of a new gravity sewer for a distance of 11,000 linear feet with a new 27-inch and 36-inch diameter pipe to replace or supplement the capacity of the existing sewer that runs along a cross-country easement all parallel to Kinley Creek from Linsbury Circle approximately to the Saluda River Pump Station. This project is the second phase of conveyance capacity improvements required to avoid SSOs in the Kinley Creek area of the Saluda River Basin.
Funding for MWWTP projects necessary for maintaining efficient performance and compliance. Projects may include: Train 2 Mag System, dewatering roll-off pad, sec clarifier weir replacement, Leachate/sidestream EQ, biosolids staging and storage, digester pumping improvements, T2 aeration improvements, T1 aeration modifications, Sec Clarifier 5/6 rehab, PTF course bar screening.
The West Columbia Pump Station Improvements are required to increase the firm pumping capacity to 26 million gallons per day (mgd) to meet sewer flow rates through 2040. This project will increase the capacity of the pumping station to convey flows to the Metro Wastewater Treatment Plant and avoid SSOs in West Columbia.
This project is for Train 2 Aeration & Dewatering System Upgrades - centrifuge, controllers, and blowers.