Using compressed air to clean out the concrete hole.

[FloorMedic's]

JD, Below is a great cordless vacuum that i use and its economical. Also i have dustless cordless drills that can drill 25 plus holes on a single charge and do it 50 percent faster with less ambient decimals, however that is classified. haha!!!

Grainger:
http://www.grainger.com/Grainger/MILWAUK...3MILWAUKEE Wet/Dry Vacuum, Volts 18.0 VDC.

Wet/Dry Vacuum, Voltage 18.0, Includes Filter Assembly, Crevice Tool, Wide Nozzle, and Vinyl Hose
Grainger Item # 2CDC6
Price (ea.) $125.00
Brand MILWAUKEE
Mfr. Model # 0880-20
Ship Qty. 1
Sell Qty. (Will-Call) 1
Ship Weight (lbs.) 13.4
Usually Ships** Today
Catalog Page No. 3207