Akron Water Pollution Control Station No Feasible Alternative

4.3.3. Summary
A brief summary statement follows for the feasibility of sewer separation and express sewers.
4.3.3.1. Sewer Separation
From the original and updated costs presented it is not financially feasible to implement a
system-wide sewer separation CSO control approach. However, it is considered feasible to
implement sewer separation in areas designated as Racks 8, 9, 13, 21, 25, 30 and 39 as
proposed in Integrated Alternative #2.
4.3.3.2. Express Sewers
From the analysis and evaluation in the Facilities Plan 98 6 and the Long-Term Control Plan
Additional Alternatives, 2002 Report 10 implementation of express sewers is not a feasible CSO
control alternative.
4.4. Satellite Storage/Treatment Alternatives
4.4.1. Alternatives
One of the fundamental alternatives for the collection system evaluated in Facilities Plan 98 6
was for storage and treatment. Within storage and treatment approaches there are three
primary alternatives as follows:
• Deep tunnels.
• Storage basins.
• Treatment basins.
Each of these alternatives was evaluated in detail as described in Section 13.2.1 in Facilities
Plan 98 6 . Excerpts from Sections 13.2.1.2 and 13.2.1.3 follow which describe the type of facility
evaluated.
Storage Basins
Storage basins proposed would provide storage, screening, and settling for
overflow volume from the racks, up to the capacity of a selected design storm.
The most cost effective design storm to be used in sizing each basin was
determined through procedures described later. During a storm event, CSO
currently directed to a receiving stream from a rack, would flow to a basin. CSO
volumes greater than the basin’s volume would flow through a shunt channel and
overflow into the receiving stream.
Screening and odor control would be included with each facility. Course bar
screens positioned in the basin influent channel would remove floatables. The
bar screens would have 0.5-inch clear spacing and would provide floatables
removal and protect downstream equipment from large objects in the CSO. The
bar screens would be cleaned by an electrically driven (~5 hp) rake mechanism.
The odor control system would consist of an activated adsorber unit (carbon
Page 4-18