Brookfield - Bishops Woods

Project Specs:

Project Name: Brookfield Bishops Woods
Project Manager: Dick Milaeger
Type of service: Radium reduction study
Where: City of Brookfield, WI
Date completed: 08-12-2019
 

What was the Issue?

Samples taken over an eight-month period from the Bishops Woods Well (#22) in Brookfield, WI indicated the presence of combined radium-226 and radium-228 in excess of the 5 pCi/L Maximum Contaminant Level (MCL). Radium is a naturally occurring element typically found in sandstone of the earth’s crust but when measuring over the MCL it is a violation of state and federal drinking water regulations and requires a prompt resolution.

 

Municipal Well & Pump Steps Up

This is a scenario that Municipal Well & Pump has seen before and is well suited to handle. Project Manager Dick Milaeger worked closely with Dr. John Jansen and Ted Powell of Collier Consulting to perform a radium reduction study and provide a recommendation to the Wisconsin DNR and the City of Brookfield on how to successfully reduce radium from the well.

The results showed the radium was coming from the upper portion of the borehole and determined the best approach to reduce the radium concentration would be the installation of a high-pressure inflatable packer to seal off the radium-rich zones and improve production from the low radium or radium free zones. The pump would be lowered just below the inflatable packer and continue to pump at a rate of 400 gpm.
 

Approach to Well Rehabilitation

After receiving approval from the Wisconsin DNR, Municipal Well & Pump took the following steps to rehabilitate well #22.


1. Removed well pump and motor equipment
2. Brushed casing and borehole
3. Treated well with AirShock® equipment using compressed nitrogen from low radium zones
4. Bail filled from well
5. Installed permanent pumping equipment and packer to 1,300’
6. Conducted extensive testing and collected samples Result Municipal Well & Pump, along with Collier Consulting, were able to seal off the high radium zone by successfully placing the inflatable packer at a depth of 1,300 feet. Thus, saving the City of Brookfield well over $1 million plus keeping the well in service.

 

Result

Municipal Well & Pump, along with Collier Consulting, were able to seal off the high radium zone by successfully placing the inflatable packer at a depth of 1,300 feet. Thus, saving the City of Brookfield well over $1 million plus keeping the well in service.