Case Study: Water Well Recovery
Chatham, Massachusetts
The Challenge
Chatham did not wish to take the well off-line for up to a week for traditional well development processes and Maher Services suggested in-situ redevelopment.
In-situ redevelopment employs the use of Pantonite redevelopment chemicals through the existing well pump and motor to remove encrusted iron, manganese and biofilm from the well screen and adjacent gravel packed material.
Well characteristics were as follows:
• 24” diameter gravel packed well
• 124’ depth
• 20’ shutter type screen
• Gould 10 DHLO 8 stage vertical turbine pump
• US 75 hp motor
This picture shows the Biological Activity Reaction Test, or BART test, before the Pantonite process took place.
The Solution & Results
Methodology:
• 4 drums of Pantonite were added to the vicinity of the well screen using a tremming pipe.
• Existing well/pump was turned on and off against a closed head 5 times.
• The following day, contents were pumped to waste, neutralized with soda ash and allowed to run until clear.
Results:
• 55% increase in specific capacity from 52.2 gpm/ft. to 81.2 gpm/ft. at 650gpm
• A clear qualitative improvement in sample appearance in the BART test after the Pantonite treatment
