Water Well Journal
Issue link: http://read.dmtmag.com/i/740475
the fines then fall to the ground prior to entering either the wellbore or the annu- lus. Taking time to slowly dump the bag is also beneficial as it helps prevent bridging. When abandoning a well, a good rule of thumb is to dump the bentonite across the hardware cloth or trough and then through a funnel half the diameter of the wellbore. The theory is if the ben- tonite doesn't bridge in the funnel, it will help minimize bridging in the well. Next time, I'll outline the issue of minimum regulations of well grouting. I'll also follow that up by looking at grout placement for both bentonite and neat cement grouts. WWJ WWJ November 2016 51 Twitter @WaterWellJournl DACUM Codes To help meet your professional needs, this column covers skills and competen- cies found in DACUM charts for drillers and pump installers. DO refers to the drilling chart. The letter and number immediately following is the skill on the chart covered by the column. This column covers: DOE-16, DOH-6 More information on DACUM and the charts are available at www.NGWA.org. Gary Shawver, MGWC, is president of Shawver Well Co. Inc., an employee stock ownership plan company in Fredericksburg, Iowa. He has been in the water well industry for 40 years and is a Master Groundwater Contractor. He has served as president of the Iowa Water Well Association, the Iowa Groundwater Association, and most recently served on the NGWA Board of Directors. Shawver is semi-retired, having sold his business to his employees. He contributes to NGWA's member e-publication and can be reached at grs@shawverwell.com.