Agenda

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Item # 11.

Work Session and Regular Meeting

Meeting Date:	04/09/2019
Department:	Public Works
Pillars:	Excellence in Asset Management Optimize the Addison Brand

AGENDA CAPTION:

Present, Discuss, and Consider Action to Approve a Resolution for the Award of a Construction Contract with Energy Resources, Inc., for the Dredging and De-silting of Farmers Branch Creek Located in the Vicinity of the Ponds at the Vitruvian Park Development and Authorize the City Manager to Execute the Contract in an Amount Not to Exceed $1,216,600.

BACKGROUND:

Farmers Branch Creek enters the Town of Addison approximately 40 feet east of Bella Bridge in the Vitruvian Park area. In urban environments, waterways such as Farmers Branch Creek are susceptible to silt and sediment build up. Construction on the Vitruvian Park reservoir area was completed in 2011, and since that time a considerable amount of silt and sediment has built up in the creek. This sediment must now be removed to restore the storage capacity of the reservoirs. De-silting the reservoirs will also improve the overall health and ecosystem of the pond and enhance the aesthetics.

Nathan D. Maier Consulting Engineers, Inc., was selected to perform design and permitting services associated with the dredging project in Summer 2018. On-stream waterways, such as Farmers Branch Creek, are regulated by the US Army Corps of Engineers (USACE) and require special permitting by that agency prior to any de-silting activities. The plans, specifications and proposed means and methods of construction were submitted to the USACE and we have received approval and a permit to perform dredging activities.

The project scope includes silt removal of approximately 5000 cubic yards, the haul off of material dredged from the reservoirs, and the restoration of the affected areas. The silt will be pumped into large, geotextile dewatering tubes, and a polymer material will be added to the tube to accelerate the water removal. Once the silt material has reached the specified water content, the bags will be opened and the silt will be hauled to a certified landfill. The contractor is responsible for all handling associated with this material and must supply the Town with verified trip tickets for each visit to the landfill.

Design was completed in early February 2018 and the project was posted on BidSync. The Town received three bids. A bid tabulation is provided below:

Contractor	Amount
Energy Resources, Inc.	$1,216,600
Dredgit Environmental Group	$1,369,000
Texas Dewatering, LLC	$2,215,100

Energy Resources, Inc., has been determined to be the lowest, responsible bidder. Nathan D. Maier Consulting Engineers has checked Energy Resources references and finds them capable of completing this work. This project is budgeted for in the Stormwater Capital Projects fund in the amount of $3,100,000. The project is expected to take 4 months to complete upon approval of all required submittals and issuance of the notice to proceed. The submittal process is expected to take approximately 3 weeks.

The de-silting project scope is incorporated into the proposed amendment to the Town's Water Rights Permit for the Vitruvian Reservoirs. Staff is currently working on a contract with Nathan D. Maier Consulting Engineers (NDM) for construction management services during this project. NDM is very familiar with the Town's water rights permit and has worked with the Town to sort through the permit issues with the Texas Commission on Environmental Quality.

RECOMMENDATION:

Administration recommends approval.

Attachments
Resolution - Energy Resources Inc- Vitruvian Dredging
Recomendation of Award Letter
Project Specifications
US Army Corps of Engineers Permit