O'Donnell & Associates, Inc., Logo
Phone Icon (251) 285-5945
Contact for Consultation


Spray Disposal Field Hydrogeologic Services

This project began with consultation with the utility and engineering firm on what will be required hydrogeologically for a spray disposal field. The project moved forward with a standard hydrogeologic assessment and then coordination of an Alabama Department of Environmental Management (ADEM) field inspection with five test pit excavations. With all factors favorable, the project moved forward with OAI's development of a Groundwater Monitoring Plan (GMP) to assess groundwater underlying a planned spray disposal field located in rural Mobile County, Alabama.

Constructed in Phases, the spray disposal field will treat wastewater from the neighboring school and surrounding subdivisions. With an initial Phase 1 treatment and discharge flow of 30,000 gallons per day (gpd), the facility will have a maximum permitted flow of 120,000 gpd when completed. The GMP was designed to satisfy the regulatory requirement for a groundwater monitoring plan for land application of treated domestic wastewater.

In accordance with ADEM GUIDELINES FOR HYDROGEOLOGIC SITE EVALUATIONS, the GMP included:

  • A map showing the location of the proposed monitoring wells
  • Proposed construction diagrams of the monitoring wells
  • Monitoring frequency (sampling frequency)
  • Monitoring parameters
  • Sampling plan
  • Analysis plan

The plan was implemented in September 2016 with the installation of five monitoring wells

OAI's Temporary Field Office as MW-5 is Installed