New Well Siting: 1. Determine the siting of the new well. It is preferred that the new monitoring well be within a 20-foot radius of the existing SH-4 monitoring location. Moving the monitoring location outside of this radius may need additional approval by NHDES’ Groundwater Permits Coordinator. Such approvals, if necessary, shall be the responsibility of the contractor. 2. This work will need a Permit by Notification in accordance with Env-Wq 1406.05 (b). The contractor conducting the drilling shall provide the NHDES Shoreline Permitting Section, the Upper Merrimack Monitoring Program, the City of Franklin (property owner), and the farmer leasing the City of Franklin parcel with written notification of the general location and the type of work to be conducted at least 14 days prior to its commencement. 3. Since the location of this radius is located on a wood line of an active cornfield, vegetation removal may be necessary. The contractor shall work with the WRBP to determine the best location to install the new well. The WRBP can remove shrubbery while the contractor and/or their subcontractor shall be responsible for the removal of any trees over 6” diameter-at-breast height, as necessary. New Well Construction and Development: 1. The well shall be constructed using a 2-inch O.D. flush jointed polyvinyl chloride (PVC) well materials machine-slotted [0.010-inch] well screen and solid riser pipe. 2. PVC casing should not be driven but slid into the drill hole. Steel casing may be driven, but a drive shoe should be used when driving it into the ground. 3. The depth of SH-4 is roughly 32-34 feet deep. The new well shall be constructed approximately 40 feet deep, if conditions allow. No well less than 34 feet shall be accepted. 4. An end cap shall be attached at the bottom of the well screen, and a silica sand pack placed between the screen and borehole annulus for the base of the screened interval to an approximate one foot above the top of the well screen. 5. A 2-foot-thick bentonite seal placed above the sand pack and the remainder of the borehole annulus filled with formation material to 1 foot below ground surface. 6. No solvents or glues shall be used in the well construction. 7. A lockable steel protective casing with a concrete surface seal shall be installed. Well riser shall be a minimum of 3 feet above ground level. Well shall be fitted with a secure tamper proof well cover. 8. Drilling fluids shall be that of potable water only, to prevent contamination of the well. 9. The well shall be developed to remove silts, clays, and drilling mud deposited in the borehole during the drilling process. 10. The contractor shall removal and dispose of all materials off site and complete site restoration, as necessary. 11. Any vehicles used shall be operated in a manner that minimizes disturbance to the natural woodland buffer and farmland. 12. Drilling operations shall be managed so as to have no impact on water quality. 13. Drill holes shall be back filled with drill spoil or clean fill or permanently cased. 14. Drill cuttings not used to back fill drill holes shall be removed. 15. Equipment shall be operated and maintained to prevent spillage of fluids including, but not limited to, oil, gas, antifreeze, or hydraulic fluids. New Well Documentation: The contractor shall provide documentation in the form of a report and boring log, and shall include, but not be limited to, the following information: 1. Well location by GPS. 2. Well ID number for the new well (e.g. “SH-4a”). 3. Well drillers name/organization and license number. 4. Depth drilled and depth of completed well (in feet). 5. Annular seal depth and material(s) used. 6. Depth and height above ground of all casings and liners, diameters, types of material (e.g. PVC, steel), and schedules or wall thicknesses. 7. Full description (material, size, quantity, etc.) and location by depth of all perforations, screens, pack, and any other component of the well. 8. Date and depth to static water level. 9. Ground, top of casing, PVC elevations. The vertical datum shall be provided. 10. The contractor shall submit the required Well Completion Report to the Water Well Board to include all required information such as construction details (depth, yield, etc.) along with information describing geologic materials and subsurface conditions at the well site. Information shall comply with RSA 482-B. 11. The contractor shall submit the “Well Completion Report” to the NHDES’s OneStop “Water Well Inventory.”
