This project converted the filters from gravity to pumped backwash and included:
Filter piping gallery
An open concrete gallery was installed to allow access to existing underground piping to provide access for maintenance.
New filter to waste drain line and backwash supply line installed for more effective backwash cycles.
New butterfly valves and pneumatic actuation was installed and connected to a new central control panel on top of the filter gallery wall for operation of new pneumatic backwash system.
Backwash pump system
Backwash pump building
Backwash pumps and air compressor for the filter backwash system.
Backwash pumps are sized to properly expand the filter media to allow the filter media to be cleaned without disturbing the filtering quality of the media.
Subgrade was over excavated 6’ and backfilled with density controlled select fill to reduce the potential settlement of the structure. 200,000-gallon clearwell:
All welded construction with self-supported style roof.
Piping and valves installed to allow new tank to be operated in series or parallel with existing clearwell. Also allows for isolation of both clearwells for maintenance.
Clearwell is connected to backwash pumps for a direct supply for filter backwash water.
Economical ring wall style foundation with an over excavation of 6’ and installation of density controlled select fill to reduce the potential settlement of the structure.
Along with the above noted major improvements to the water treatment plant, a number of inline control valves and new yard piping to convey, isolate, and better use the water treatment plants upgrades and overall capacity were installed.
Filter Backwash: $1,271,442.00
Engineering Feasibility Report
Design Plans & Specifications
Construction Bid & Award
O & M Manual