Client project details

Portland Water District; City of Portland, ME (Development of Emergency Backup Water Supply)

The Project

The Portland Water District’s (PWD's) sole source of potable water was Sebago Lake, from which it draws between 24 and 40 MGD. Several aspects regarding the performance of the water treatment system had caused the District to consider supplementing their surface water supply with groundwater withdrawals from sand and gravel aquifers in the Sebago Lake region.

EGGI was selected (on the basis of a competitive review) to lead a team of geologists, hydrologists, and engineers to complete a multi-phase study to conduct a groundwater exploration, development, and protection program. Groundwater resources developed for the PWD will serve as an emergency backup supply and/or as a permanent supplement to their existing surface water supplies. The development of groundwater resources will also help to increase water source security.

Status/Results:

By conducting detailed geological mapping, geophysical surveys, groundwater modeling, exploratory test drilling, pumping tests, hydraulic modeling, and detailed hydrogeological assessments EGGI developed a new 24-inch-diameter production well capable of producing up to 2,400 gpm (or 3.45 MGD) of potable groundwater resources. EGGI's investigation laid the groundwork for the groundwater withdrawal permit obtained for the well from the State of Maine.

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EGGI was selected (on the basis of a competitive review) to lead a team of geologists, hydrologists, and engineers to complete a multi-phase study to conduct a groundwater exploration, development, and protection program.

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P.O. Box 1578
56 Main Street
Meredith, NH 03253
T: (603) 279-4425
F: (603) 279-8717
eggi@eggi.com

“Data and research provide the underpinning for sound local water management decision-making that advances the well-being of the nation’s citizens, economy, and environment.”

- National Ground Water Association