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NEPA Details

Title

Categorical Exclusion For the City of North Miami Beach Norwood Water Treatment Plant Upgrade and Transmission Main Improvements and Replacements Project

Document Number

N2020008

Document Type

CATEX

Project Description

The City of North Miami Beach (the City) is conducting upgrades to the water main distribution system across its service area as well as to its existing treatment and auxiliary systems at the Norwood Water Treatment Plant. The WIFIA Project is part of the City’s five-year capital improvement program that aims to replace aging infrastructure and improve redundancy in plant operations as well as reduce pressure losses and main breaks throughout the distribution system. The WIFIA Project includes the following components: • Phase IIA – Construction of new Floridan Well and Rehabilitation of Existing Biscayne Well. This project will provide the necessary volume of raw water at the Norwood Water Treatment Plant’s membrane facility to maintain finished water production while the lime softening plant is under construction (Phase IIC). The new Floridan well will have a production capacity of approximately 2,000 gallons per minute and will connect to the existing raw water main. The Biscayne Well #1 will be rehabilitated to restore its original production capacity of approximately 4,000 gallons per minute. The Biscayne Well #1 will serve as backup water supply to two of the City’s off- 2 site production wells, which are not currently equipped with emergency electrical generators. This rehabilitated well will be capable of serving the lime softening plant and membrane treatment plant, which are parallel water treatment processes accounting for the finished water at the Norwood Water Treatment Plant. • Phase IIB – Reliability Improvements of Norwood Water Treatment Plant Operations. This project will improve the reliability of the plant’s treatment processes and auxiliary systems in order to temporarily shut down the lime softening facility for rehabilitation (Phase IIC). The City will rehabilitate and improve operations of several chemical feed systems, the membrane degasification system, the Master Sewage Lift Station, a high service pump station (HSPS No. 1), control room, laboratory facility, maintenance and storage warehouse, among other auxiliary facilities. The City also plans to demolish decommissioned structures, including the Phase I VOC Removal System, and upgrade the plant’s electrical distribution system and the heating, ventilation, and air conditioning system. • Phase IIC – Rehabilitation of Norwood’s Lime Softening Plant. This project will rehabilitate the existing lime softening plant to extend the life and reliability of the plant to treat 15 million gallons per day of raw water. The rehabilitation will involve improvements to the filter beds, clear wells, backwash system, clarifiers, and appurtenances. It will also involve an upgrade to the plant’s electrical system. In combination with the current expansion at the membrane treatment plant to 25.6 million gallons per day, the City will be able to meet its projected 2030 production demand of 35 million gallons per day. The expansion of the membrane treatment plant is currently under construction and outside the scope of the WIFIA project and NEPA review. • Phase III – Transmission Main Improvements and Replacements – Improving Pressure. This project will address sections of the water transmission and distribution system that need to be replaced or expanded in capacity to reduce pressure loss events, meet compliance with firefighting flow, and to replace aged infrastructure. It will also improve operations at the Operations Center pump station to better maintain pressure throughout the distribution system. The City has already identified two areas for water main rehabilitation in the Eastern Shores and Honey Hill neighborhoods, involving 14,000 linear feet and 8,700 linear feet of pipe replacement, respectively. Further, the City has investigated ten out of approximately fourteen aerial pipe bridge crossings, most of them over canals, and has identified three crossings that require replacement of pipes and piers due to severe deterioration. As the City continues evaluating its hydraulic models and condition assessment reports for each segment of pipeline, it will identify priority areas for pipe replacement within the distribution system. The City plans to issue design-bid-build contracts for this project.

EPA Region/Headquarters Office

OW

State or Territory

FL

Point of Contact

Alaina McCurdy
202-564-6996
Mccurdy.Alaina@epa.gov

Date of Issuance

04/29/2020


NEPA Document(s):

NMB NEPA CATEX_042720_approved.pdf (7 pp, 354 K)