NGWA mourns loss of former Executive Director Jay Lehr, page 54
February 2023
The Groundwater
NGWA
Association
®
Advantages of
Dual Rotary
Switching to this drilling
method is increasing due
to its versatility, efficiency,
and cost-effectiveness, page 21
Also:
Using Air and Foam, page 36
The Devil's in the Details,
page 40
