R2016-144 Agreement with Chastain & Associates for Final Design Baltimore Road Drainage Improvements

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12/15/2016 Item Coversheet in Public Works DATE: 12/8/2016 MEMO: 2016-74 TO: Honorable Mayor Moore Wolfe and City Council FROM: Timothy Gleason, City Manager Richard G. Marley, P.E., Public Works Director SUBJECT: Resolution Authorizing an Agreement with Chastain &Associates, LLC for Final Design of Baltimore Road Drainage Improvements Associated with Macon County's Baltimore Road Reconstruction Project, City Project 2014-20 SUMMARY RECOMMENDATION: It is recommended that the City Council approve the attached Resolution authorizing the Mayor to sign and the City Clerk to attest a Professional Engineering Services Agreement between the City of Decatur and Chastain &Associates, LLC, (Chastain), for the amount of$125,958 to complete the final design for drainage improvements associated with Macon County's Baltimore Road Reconstruction Project. BACKGROUND: Baltimore Road Reconstruction Project The Macon County Highway Department, working through their consulting engineering firm Chastain &Associates, is currently progressing in the final design phase of the Baltimore Road Reconstruction project which extends from Fulton Avenue to Lost Bridge Road (see attached drawing). During the public information meetings held for the project when it began back in November of 2012, the most frequent comment from residents of the area was that the drainage was poor and that they supported the roadway project as long as the drainage would be fixed. The proposed Baltimore Road improvements will include the installation of a large storm sewer the length of the project in order to reduce flooding, especially in the north portion of the roadway south of Route 36. The design and construction of the new storm sewer system has provided the City with an opportunity to upsize the proposed storm sewers to allow the City to address chronic drainage concerns in the residential areas adjacent to Baltimore Road. In 2014, when Chastain and Associates were actively performing the Baltimore Road preliminary design review for Macon County, the City approved a preliminary professional services agreement with them to review drainage concerns in the area and perform a preliminary design to recommend size increases to the County's proposed storm system to accommodate additional drainage. This was a logical approach since Chastain was actively doing the design work for the County and were very familiar with the area and already had much of the background data required. Chastain has completed their initial drainage assessment and the Executive Summary is attached. The review estimated that the cost to upsize the County drainage system to be between $500,000 and $600,000. Chastain also proposed three storm sewer extensions that would benefit drainage in the neighborhood's immediately adjacent to Baltimore which are estimated to cost between $600,000 and $700,000. Stormwater Master Plan The City's 2009 Stormwater Master Plan documented and prioritized numerous drainage problem areas throughout the City. Two large areas adjacent to Baltimore Road were identified as having high priority drainage problems that need to be addressed. https://decatur.nowsag enda.comlag endaWebtCokerShoet.aspx?ltemlD=970 1/3