SCI Forest Sewage Pretreatment & Pump Station Facility, Marienville, PA
L.R. Kimball served as the Design Professional for the upgrade to the SCI Forest sewage pre-treatment and pump station facilities. The Department of General Services design build project required conformance with their procedures. L.R. Kimball was the Design Professional to G.M. McCrossin, Inc. the design build contractor. Services included preliminary and final design, Water Quality Management Permit application, Labor and Industry submission, construction drawings, bypass pumping plan, construction specifications, electrical bid package, electrical contract bidding services, shop drawing approvals, bi-weekly construction meetings, change order approvals, project close-out and as-built drawings. L.R. Kimball provided the wastewater, hydraulic, electrical, control system, structural and HVAC design services.
The project scope included a wider influent channel to accommodate a new sewage grinder and automated fine screen to remove the solids. A wider bypass channel was also provided with a static bar screen as an emergency overflow and for maintenance of the grinder and fine screen. The duplex pumps rated at 850 GPM were replaced with two 1,100 GPM VFD controlled pumps. Pump discharge pipe, plug valves, check valves, flow meter and actuated valves were replaced. The project included new hoists, flow detention tank modifications and security fencing.
Full time operation of the pump station was mandatory during construction. The design build bridging documents called for a pump system to be provided with temporary pumps, temporary grinder, temporary connection to the existing force main, freeze protection of the temporary system for an operational period of 120 days. L.R. Kimball assisted in the development of a streamlined bypass control plan that ultimately only required bypass pumping for three separate night shifts to perform the construction. The plan included initial construction of the new bypass channel while maintaining the existing main channel and bypass channel and existing grinders. Flow was then diverted into the bypass channel with the two existing grinders relocated while the new main channel was constructed. Once the new channel was completed and the new grinder and screen installed, flow was returned to the main channel and the bypass channel facilities completed. To maintain pumping during the replacement of the pump and piping, a permanent connection was made to the force main in the building to discharge temporary pumping flows. The existing pumps were relocated out of the way and were connected to the wetwell suction and new force main temporary pump connection which allowed the replacement of piping, valves, meter and installation of the new pumps. Once the new pumps were online, the original pumps and temporary connections removed. The modified bypass flow plan greatly reduced the risks inherent with a temporary bypass pump system
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