DATE: October 31, 2014
TO: Board of Mayor and Aldermen
FROM: Eric Stuckey, City Administrator
David Parker, City Engineer/CIP Executive
Paul P. Holzen, Director of Engineering
William Banks, Staff Engineer
SUBJECT:
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Consideration of Resolution 2014-50, A resolution to Approve the Preliminary Design and Authorize Staff to Proceed with Final Design, Right-of-Way Acquisition and Construction Bidding Phase for the 100-Block Battle Avenue Drainage Improvements Project (11/12/14 CIC Referred to 11/25/14 Worksession 3-0)
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Purpose
The purpose of this memorandum is to recommend approval of Resolution 2014-50, A Resolution to Approve the Preliminary Design and authorize Staff to Proceed with Final Design, Right-of-Way Acquisition and Construction Bidding Phase for the 100-Block Battle Avenue Drainage Improvements Project.
Background
On June 10, 2014, City staff gave a presentation outlining the preliminary design of the 100-Block Battle Avenue Drainage Improvements Project. During this presentation, multiple concerns were brought up about the design. Staff was asked to hold a few additional project meetings with the neighborhood to ensure that we had public support for the project prior to moving forward with Final Design, Right-of-Way Acquisition and Construction.
Following the June 10th work session, staff met with multiple residents to gathering input on what types of questions and/or concerns would need to be addressed. On August 5, 2014, a neighborhood pubic meeting was held at City Hall, where most of the affected residents attended. The majority of attendees were in favor of the project. On August 8, 2014, a survey letter and questionnaire was sent to the neighborhood residents and property owners to gather more information. The questionnaire results showed overwhelming support for the project, with eleven (11) "For" the project, One (1) "Possibly For" the project (depending upon ROW negotiations), and One (1) "Against" the Project. See the attached "EXHIBIT A" questionnaire and response summary for details.
Resolution 2014-50 will formally adopt the preliminary design allowing staff to move forward with final design, right-of-way acquisition and construction. Below is a summary of the project:
· The current design would modify an existing detention basin located at 110 Fairground Street (self-storage facility). The existing basin does not have an outlet or outlet control structure. Storm water runoff stored in the existing basin is pumped to an existing storm sewer system at the intersection of Fairground Street and Columbia Avenue. The recommended alternative for improving drainage and flooding within the 100 block area of Battle Avenue includes expansion of the existing pond approximately 100 feet to the north which increases available storage to contain storm water runoff. With the pond expanded, a new pump station would be installed. Drawdown after a rainfall event will be regulated to ensure that capacity of the existing storm water system where the water is pumped is not exceeded. The expanded detention pond would be placed on an isolated parcel of land located behind 1408 Columbia Avenue and 107 Battle Avenue.
· Additional storage volume of the proposed expanded detention basin would provide enough volume to reduce flooding and drainage issues at all five residences in the 100-Block of Battle Avenue during the 100-year storm event. Any storm event larger than a 100-year storm, like the May 2010 Flood, may still have some flooding impacts to properties in the area. This is mainly because of the downstream stormwater system and its capacity constraints.
· Stormwater area drains will be installed at the low points near 113 and 114 Battle Avenue to eliminate the roadway ponding / hydroplaning concern. This system will be piped between 113 and 115 Battle Avenue to the City owned alley behind these properties. The Stormwater will then continue being piped along the alley to the expanded detention pond.
· The backyards of 109 through 115 may be slightly re-graded so stormwater ponding can drain towards the City alley. A more-defined grass swale will be created in the alley that will properly convey the backyard stormwater to the expanded detention pond. To properly install this system, some existing trees and landscaping will be removed and replaced with new trees and landscaping.
· Property Acquisition will encompass multiple drainage easements and temporary construction easements. The City hopes these will be donated because of the improvements we are making to their properties.
Financial Impact
The Estimated project cost is $1,200,000 to include Final Design, Permitting, Right-of-Way, Construction and Inspection. Total project funding included as part of FY2015 Stormwater Budget under Capital; 89410 Drainage; Various at $1,500,000.00.
Recommendation
Staff recommends approval of Resolution 2014-50.