Specifications include, but are not limited to: WELL COMPLETION DETAILS Methods of completion not anticipated in the bidding process will be considered depending on conditions encountered and the driller’s recommendation. Any alternative completion methods must be agreed to in advance by the MBMG representative. Drilling depths may be up to 400 feet. Borehole diameters are planned to be 6-inch or larger. Completion details include: Seven wells approximately 300 ft deep and three wells approximately 75 ft deep. A surface annular seal will be installed for each well, to a minimum depth of at least 10 feet. Bentonite fed along the outside of the casing as it is being advanced is not acceptable for the purposes of this contract. One approach to this surface seal could be to first drill a 10-foot deep, 8-inch diameter pilot hole. Once the 6” steel casing is advanced to the 10 foot minimum depth, the hole outside of the 6” casing would be filled with bentonite chips or high solids bentonite grout. If cuttings and produced water can be diverted away from the annulus, the bentonite could be installed at the end of drilling. The driller may offer alternative methods for achieving this annular seal, based on their experience and equipment. The wells will be completed by either using a 10’ telescoping screen, or by perforating the bottom 10’ of the steel casing (driller’s choice). For all wells, a locking-cap will be installed on top of the steel casing. MBMG will provide locks. All wells must be completed in compliance with the Montana Well Construction Standards for monitoring wells (MCA 36.21.701-810) or production wells (MCA 32.21.101-680. WELL DEVELOPMENT All wells will be developed immediately after completion. The wells will be developed until discharge water is visibly clear and pH, specific conductance, and temperature have stabilized. MBMG personnel will measure groundwater parameters and determine the duration of development. WELL DRILLING METHODS Drilling Methods The wells will be installed using dual rotary forward air drilling, or a similar method that allows the cuttings to travel from the bit to the surface with minimal contamination from the overlying materials. The casing shoe must be near the bit at all times. Drilling mud, such as a bentonite drilling fluid will not be used during drilling unless specifically agreed to in advance with the MBMG representative. Drilling speed will be maintained at a rate that produces straight and true holes and allows the hydrogeologist to log cuttings. Slow drilling will be particularly important in the confining layer, where drilling could be rapid, but detailed cuttings logs will be needed. There may be times when the drill rig will be idled to allow for testing water producing zones or other activities. Daily Log The driller and the MBMG hydrogeologist shall jointly complete a daily report. The report shall give a complete daily description of each billable item, as listed on the bid sheet.