OAR 690-240-0485: Monitoring Well Development

(1) The monitoring well development shall not affect the integrity of the casing or seal. Monitoring well development shall not occur prior to 24 hours after annular seal placement if cement grout or a bentonite grout slurry is used, or 12 hours after annular seal placement if dry bentonite is used. The well may be developed prior to placement of the annular sealing material. (2) The monitoring well development should: (a) Remove any water or drilling fluid introduced into the well during drilling; (b) Stabilize the filter pack and formation materials opposite the well screen; (c) Minimize the amount of fine-grained sediment entering the well; and (d) Maximize well efficiency. (3) As long as the well is not altered, the monitoring well development may be performed by other than a licensed and bonded Monitoring Well Constructor.