Once your 2.0 in. prepacks are installed, you need to develop the well properly. The 2.0-in. Well Development Tool is equipped with a flexible polyurethane collar to help surge water into and out of the screen during the development process. The development tool attaches to nominal 0.5-in. PVC riser so it can be lowered into the well and efficiently raised and lowered to surge and purge the well. Movement of water into and out of the screen provides for better development and removal of fines around the well interval. A check valve in the tool allows you to purge water from the well while surging to help remove the fines and provide for good hydraulic communication between the well and formation. It's best to develop segments of the screen and move up and down through the screen interval repeatedly to achieve adequate development. Review ASTM Standard D 5521 for additional guidelines and information on well development techniques and purposes.
2.0 in. Well Development Tool Operation
Downstroke of tool surges groundwater into formation. Work incrementally up and down through the screen interval.
Upstroke of tool surges groundwater and fines from formation into the well.
Start with valve open and purge to establish flow into the well. Oscillation of tool pumps groundwater from well.
Water Level Meter
Standard features of the water level meter (Part No. GW2000) available from Geoprobe Systems® include:
Lightweight (6 lbs.) tubular frame
9-in. diameter spool
Zero displacement probe, 7/16-in. OD
Flat tape with 1/10-in. markings
100 ft., 200 ft., 30 m, or 60 m lengths
Durable push-button Off/On switch
Low power consumption for up to 2 year battery life
Audible (buzzer) and visual (LED) signal output
Tubing Check Valves
Choose from a variety of sizes for your specific groundwater sampling needs. Constructed of either stainless steel or PVC. The check valve is fully captured in the body of the valve so you don’t lose the ball! Great for cleaning out and developing small-diameter direct push tools and wells prior to either sampling or slug testing.
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