The City of Columbus, Ohio’s Division of Sewerage and Drainage awarded a contract to Malcolm Pirnie (MP) to oversee the preliminary engineering for the 200 MGD East Grit Removal Facility at Southerly Wastewater Treatment Plant (SWWTP) as part of

the

City’s ongoing efforts to minimize wet weather flows to the Scioto River. PRIME was subcontracted by MP to provide a Preliminary Engineering Report (PER) for the design of this facility.

PRIME was responsible for preparing the PER by assembling and utilizing its diverse engineering professionals – including wet weather, process, structural, civil, geotechnical, CADD, and QA/QC – and its architects.

Upon completion of the PER, the City awarded the design of the aforementioned facility along with the design of a proposed 330 MGD influent flow splitter to CDM. PRIME was in charge of all aspects of technical project management, geotechnical investigations, architectural design, structural design, process assistance, flood control, and site civil engineering for this project. The PRIME team also participated in the value engineering process to ensure cost-effectiveness of the design. PRIME designed the relocation of an existing 8” waterline to accommodate new grid facility and 1,075 linear feet of 96” PCCP conduit.

The facility consists of four reinforced concrete grit tanks, a state-of-the-art brick building, staircase,

a basement containing pumping systems, classifiers, concentrators, grit conveyor

system, piping, and conduits. The system also includes HVAC, electrical, hydraulic systems, detailed surveying, SCADA, and odor control extension systems. The total project cost was approximately $18 million.

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