TMDL and Watershed Modeling and Application

The Arizona Department of Environmental Quality (ADEQ) has established Master Agreement CTR065774, an Indefinite Delivery Vehicle (IDV) for Total Maximum Daily Load (TMDL) and Watershed Modeling and Application services. This master contract enables procurement of comprehensive environmental consulting services, focusing on water quality assessment, watershed planning, and restoration projects. The IDV covers a wide range of environmental services including TMDL calculations, water quality modeling, ecological restoration, public participation, and water quality sampling across various water systems. Specific services encompass developing implementation plans, conducting environmental sampling, creating watershed models, identifying pollutant sources, and supporting Clean Water Act Sections 303-305 water quality program activities.

The master contract was awarded to SWCA, Inc. on May 22, 2023, with an initial performance period of 24 months and a subsequent extension through May 21, 2026. The contract is a multiple-award, statewide IDV potentially available to various state agencies, departments, and cooperative buyers in Arizona. It operates as a competitive sealed proposal with task orders issued on an as-needed basis, with each task order having specific scope, schedule, and negotiated pricing based on established hourly rates ranging from $72 to $265 depending on personnel level. The contract covers the entire state of Arizona and does not guarantee a minimum amount of work, allowing ADEQ to issue task orders to multiple contractors based on project expertise and requirements.