Explanation
1. BACKGROUND: This legislation authorizes the Director of Public Utilities to enter into a professional engineering services agreement with Resource International for the Twin Lakes Upper Dam and Greenlawn Low Head Dam Project, in an amount up to $490,851.90, for Division of Sewerage & Drainage Stormwater CIP No. 611038-100000.
The Ohio Department of Natural Resources (ODNR) performs periodic inspections to evaluate the condition of dams and their appurtenances. The City of Columbus’ Division of Sewerage and Drainage (DOSD) initiated CIP 611038-100000 to provide the detailed design, specifications, contract documents, and other reports required for the improvements at Twin Lakes Upper Dam and the Greenlawn Avenue Low Head Dam. The scope of work for this project is to perform all the requisite investigation, evaluation, formulation and design work to prepare design recommendations and construction documents for these improvements.
This Ordinance provides funding for preliminary design services (Phase 1).
FUTURE RENEWAL(S): Detailed design (Phase 2) and engineering services during construction (Phase 3) will be authorized under future contract renewals.
TIMELINE: Design starts July 2018, completion October 2019. Construction start 2020, completion 2022.
ESTIMATED COST OF PROJECT:
Original Engineering Contract, $490,851.90
Planned Renewal 1, $110,000
The Community Planning Area is “Eastmoor/Walnut Ridge”.
2. ECONOMIC IMPACT/ADVANTAGES; COMMUNITY OUTREACH; PROJECT DEVELOPMENT; ENVIRONMENTAL FACTORS/ADVANTAGES OF PROJECT:
This project originated from an ODNR assessment of the Twin Lake Upper Dam and of the Greenlawn Avenue Low Head Dam. The 2016 inspection identified items related to dam safety that needed to be addressed. These items included a hydrologic and hydraulic study to determine the Twin Lakes discharge/storage capacity and associated design implementation, design and installation of an emergency spillway at Twin Lakes Dam, con...
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