View All
Permitting, Compliance, Groundwater Investigation, and Engineering Evaluation of Water and Wastewater Treatment Facilities, Sonora, CA

New Melones Lake is a recreational lake located west of Yosemite National Park. Wastewater generated by the campers and tourists visiting the New Melones Lake are treated by two seperate facilities. A new Waste Discharge Requirement (WDR) was required for each of the treatment facilities. In order to be in compliance with current rules and regulations, a series of investigations and engineering improvements were implemented.

The engineering improvements included installation of new surface aerators and impermeable liners at the wastewater lagoons, along with the installation of a new hypochloriation system, flow meters, and a land application field. Accord Engineerings professionals conducted engineering evaluations to assess the treatment efficiency and capacity of the new systems.

Our engineers and geologists prepared work plans to assess the existing shallow groundwater condition in the vicinity of each of the treatment facilities. Groundwater monitoring wells were installed in fractured bedrocks adjacent to each of the treatment facilities. Groundwater samples were collected and analyzed to assess the level and extent of contamination. Findings were reported to the Regional Water Quality Control Board as part of the WDR renewal process.

At the New Melones Reservoirs, a water treatment facility produces potable water for two restrooms and a fish-cleaning facility. The treatment facility was replaced with a state-of-the-art microfiltration and UV-disinfection system. Our engineers assisted the Bureau of Reclamation in evaluating the treatment efficiency and preparing an O&M manual for the new system. In addition, we prepared a technical evaluation and permit application package in order to obtain a permit to operate the new system from the local county authority.

More pictures from this very important project