Broken Arrow Municipal Authority
Meeting of: 10-16-2018
Title:
title
Approval of and authorization to execute Contract Amendment No. 4 to the Agreement for Professional Consultant Services between Broken Arrow Municipal Authority and HDR Engineering, Inc. for the Rehabilitation of the Headworks at Lynn Lane Wastewater Treatment Plant Screening Improvements 165420 and Grit Removal Improvements 165423
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Background:
The existing aeration basins at Lynn Lane WWTP were constructed in 2009. The flow into the aeration basins is directed towards the aerator impellor. The aeration basins have flow deflectors mounted to the walls to keep the flow from directly impinging on the impellors. However, the existing flow deflectors have been dislodged from the walls due to loading from flow turbulence. During high flow events, the incoming flow stream creates high loads on the impellors and has caused the aerator gearboxes to fail in the past, requiring repairs. The proposed contract amendment with HDR Engineering, Inc. is for the design of two baffle walls in each aeration basin (four walls total) that will direct incoming flows around the aerators, help keep solids in suspension, and reduce solids build-up at the effluent weirs. This is anticipated to result in reduced loading on the aeration impellors and therefore a reduction in damage to the aerators, as well as improved mixing of the sewage (better aeration basin performance).
Cost: $5,000.00
Funding Source: Oklahoma Water Resources Board (OWRB) Loan No. FAP-17-0004-L
Requested By: Alex Mills, P.E., Director of Engineering and Construction
Approved By: Michael L. Spurgeon, City Manager
Attachments: Contract Amendment Number 4
Recommendation:
recommend
Approve and authorize execution of Contract Amendment No. 4 to the Agreement for Professional Consultant Services with HDR Engineering, Inc.
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