14 - Professional Services Contract with Hayter - Retaining Wall along Johnson Woods Creek

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Item No. 14 Memorandum TO: Mayor & City Council Grayson Path, City Manager FROM: Carla Easton, PE, Engineering & Community Development Director SUBJECT: JOHNSON WOODS BANK STABILIZATION — DESIGN CONTRACT WITH HAYTER ENGINEERING DATE: July 27, 2020 BACKGROUND: There is an existing sackcrete wall that has failed along the Johnson Woods Creek bank behind Gary and Rebecca Nashes property located at 645 Johnson Woods Drive. The sackcrete wall has sunken into the channel and will obstruct flow during heavy rain events if not properly removed and replaced. Mr. and Ms. Nash have proposed to share the cost to replace the existing sackcrete wall with a gabion basket wall like the city just completed in the area. Consulting services are needed to prepare the plans and specifications for the wall and to oversee the construction. STATUS OF ISSUE: Hayter Engineering has submitted a scope of work for this project, and a fee of $11,175 for the design and construction management. Hayter was on the design team for drainage improvements along this channel in 2019, so they already have survey data and job knowledge of the improvements. Staff has selected them base on their qualifications to complete this work, as well as their past experience with this channel. Mr. Nash has agreed to pay upfront for 50% of the project cost up to the point where the city contribution reaches $25,000, and 100% of project costs after that. As such, staff will send an invoice to Mr. Nash in the amount of $5,587.50 upon approval of the contract. BUDGET: Funds are available in the engineering operations budget for consultants. RECOMMENDATION: Authorize the city manager to execute a professional services contract with Hayter Engineering in an amount of $11,175 for design and construction management of a retaining wall along Johnson Woods Creek.