Title

Categorical Exclusion for the Miami-Dade County Water and Sewer Department South District Wastewater Treatment Plant Expansion, Municipal Injection Wells, and North District Wastewater Treatment Plant

Document Number

N2020016

Document Type

CATEX

Project Description

The WIFIA Project consists of several discrete Ocean Outfall Legislation (OOL) Program projects to upgrade treatment processes at the South District Wastewater Treatment Plant (WWTP) and install additional municipal injection wells at the North District and Central District WWTPs. The WIFIA Project also consists of one rehabilitation project that is required under a Consent Decree between the Florida Department of Environment Protection (FDEP) and Miami-Dade County (the County) (Case No. 1:12-cv-24400-FAM). Florida¿s OOL (as amended in 2013) requires wastewater utilities in southeast Florida (covering Miami-Dade, Broward, and Palm Beach Counties) that are currently disposing treated wastewater through ocean outfalls to reduce nutrient discharges by 2018, cease using the outfalls by 2025 (except for limited continued use to manage peak sewer flows), and reuse 60% of the wastewater flows by 2025. The OOL Program projects at South District WWTP will include additions to the existing filter backwash treatment (ST-1C), headworks and oxygenation trains (ST-2A), secondary clarification (ST-2B), return activated sludge (ST-2E) and chlorination processes (ST-2C) 6to expand the treatment capacity at the plant. The OOL Program projects at North District and Central District WWTPs solely include installation of municipal injection wells. The North District WWTP will install one additional well (NE-2), which will bring the total number of municipal injection wells at the plant to five. The Central District WWTP will install two additional wells (CE-2), which will bring the total number of municipal injection wells at this plant to nine. The Consent Decree project will rehabilitate the existing oxygenation tanks (ST-1B) and also add step-feed to improve operability of the process. The County will structurally repair the existing Oxygenation Trains 1-7 and replace the existing mechanical aerators. New controls rooms and substations will be constructed for Oxygenation Trains 1-4 and Oxygenation Trains 5-7.

EPA Region/Headquarters Office

OW

State or Territory

FL

Point of Contact

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

Date of Issuance

2020-07-14 00:00:00.0

Website

https://www.epa.gov/wifia