Section 58.01.08.511 - WELL PUMPS, DISCHARGE PIPING, AND APPURTENANCES01.Sample Tap Required. A sample tap suitable for collecting bacteriological samples must be provided as required by Subsection 501.09 on the discharge piping from every well at a point where pressure is maintained but prior to any treatment. In addition, threaded hose bib taps may also be used for collecting samples, other than bacteriological samples, if equipped with an appropriate backflow prevention device as may be necessary to protect the PWS from contamination.02.Discharge Piping. The discharge line must be equipped with the necessary valves and appurtenances to allow a well to be pumped to waste at the scour velocity of the well column via an approved air gap of no less than two (2) pipe diameters, unless otherwise approved by the Department, through an approved non-corrodible screen or equivalent at a location prior to the first service connection, and must meet the following requirements:a. Be designed to minimize friction loss.b. Have control valves and appurtenances located above the pump house floor when an above-ground discharge is provided.c. Be protected against contamination.d. Vertical turbine pumps must be equipped with an air release-vacuum relief valve, or equivalent, located upstream from the check valve, with exhaust/relief piping terminating in a down-turned position at least eighteen (18) inches above the floor and covered with a twenty-four (24) mesh corrosion resistant screen.e. Have all exposed piping, valves and appurtenances protected against physical damage and freezing.f. Be properly anchored to prevent movement, and protected against surge or water hammer.g. The pump to waste discharge piping must be valved to ensure that other PWS components that may be negatively affected by the quality of the discharged water are not pressurized by the water that is being pumped to waste.h. Where two (2) or more wells are connected to a common well house, the discharge piping must be designed to ensure that each well can be pumped to waste independently without affecting the ability of the other well or wells to pressurize the PWS.03.Pressure Gauge Required. A pressure gauge must be provided on discharge piping.04.Flow Meter and Check Valve. Unless otherwise approved by the Department, an instantaneous and totalizing flow meter equipped with nonvolatile memory must be installed on the discharge line of each well in accordance with the manufacturer's specifications. Meters installed on PWSs with variable frequency drives must be capable of accurately reading the full range of flow rates. An accessible check valve, which is not located in the pump column, must be installed in the discharge line of each well between the pump and the shut-off valve. Additional check valves must be located in the pump column as necessary.05.Well Vent. All wells must be vented, unless it can be demonstrated that the drawdown under maximum pumping conditions will not exceed ten (10) feet. a. For wells not in a pump house, the open end of the vent must be screened with a twenty-four (24) mesh or similar non-corrodible screen and terminated downward at least eighteen (18) inches above the final ground surface.b. If the well is in a pump house, the open end of the vent must be screened with a twenty-four (24) mesh or similar non-corrodible screen and must terminate downward at least twelve (12) inches above the pump house floor.c. Artesian wells equipped with pumps may need venting or an air valve as determined by the Department.06.Casings and Sanitary Well Caps. The following requirements apply to well casings and sanitary caps:a. Casings must extend at least eighteen (18) inches above the final ground surface. If the well is located within a pump house, casings must extend least twelve (12) inches above the pump house floor. For a well located in an area subject to flooding, the Department may require an extension of the casing above the one hundred (100) year or highest known flood level, whichever is higher.b. Wells must be cased and provided with an approved cap in such a manner that contamination cannot enter the well.c. For community PWSs, a permanent means for measuring water level within the casing must be provided. For other PWSs, a temporary means to measure water levels may be made available. All equipment required for conducting water level measurements must be purchased and made available to the PWS operator at the time the well is put into service. Where pneumatic or electronic water level measuring equipment is used, it must be made using corrosion resistant materials attached firmly to the drop pipe or pump column and in such a manner as to prevent entrance of foreign materials.07.Well Houses. For regulatory purposes, a well house is considered a pump house as defined in Section 003. Well houses must meet the requirements for pump houses as set forth in Section 541. All above ground discharge piping must be contained in a well house or otherwise protected from freezing.08.Pitless Adapters and Units.a. Marked approved by the National Sanitation Foundation or Pitless Adapter Division of the Water Systems Council.b. Designed, constructed and installed to be watertight including the cap, cover, casing extension and other attachments.c. Field tested for leaks before being put into service. The procedure outlined in "Manual of Individual and Non-Public Water Supply Systems," referenced in Subsection 002.02, or other procedure approved by the Department Must be followed.d. If the discharge line is two (2) inches or smaller, be provided with a swing joint outside the pitless adapter unit to reduce strain, deformation, and possible leakage of the pitless seal caused by settling soils in the trench. The orientation of swing joints must be such that any settling that occurs will tighten the threads. The hole in the casing must be cut with a saw rather than a torch with an opening large enough to allow seating of gaskets.e. Provided with a contamination-proof entrance connection for electrical cable.f. Pitless adapters: i. Threaded adapters must be installed by drilling a hole not more than one quarter (1/4) inch larger than the outer diameter of the pitless shank. No torch-cut holes will be accepted. The orientation of swing joints must be such that any settling that occurs will tighten the threads.ii. The only field welding permitted will be that needed to connect a pitless adapter to the casing.g. Pitless units must be:i. Shop-fabricated from the point of connection with the well casing to the unit cap or cover.ii. Constructed of materials and weight at least equivalent to and compatible with the well casing.iii. Threaded or welded to the well casing. Threaded units must be installed by drilling a hole not more than one quarter (%) inch larger than the outer diameter of the pitless shank. No torch-cut holes will be accepted. If the connection to the casing is by field weld, the shop-assembled unit must be designed specifically for field welding to the casing.iv. Terminate at least eighteen (18) inches above final ground elevation. For a well located in an area subject to flooding, the Department may require an extension of the casing above the one hundred (100) year or highest known flood level, whichever is higher.v. Provided with access to disinfect the well.vi. Field connected to the lateral discharge from the pitless unit of threaded, flanged, or mechanical joint connection.h. After installation of a pitless adapter or unit, the disturbed well seal must be repaired or replaced to meet original seal specifications unless otherwise approved by the Department. The engineering proposal must ensure that the material surrounding the final seal is moisture controlled and compacted such that it equals or exceeds the characteristics of the native soil prior to being disturbed.09.Wells Not Allowed in Pits. Wells must not be located in pits. Exceptions to this requirement will be granted by the Department if the well was constructed prior to November 5, 1964, and the installation is constructed or reconstructed in accordance with the requirements of the Department to provide watertight construction of pit walls and floors, floor drains and acceptable pit covers.10.Discharge Pumps. Discharge pumps are subject to the following requirements: a. Line shaft pumps must: i. Have the casing firmly connected to the pump structure or have the casing inserted into a recess extending at least one-half (1/2) inch into the pump base.ii. Have the pump foundation and base designed to prevent water from coming into contact with the joint.iii. Use lubricants that meet ANSI/NSF Standard 61.b. Submersible pumps:i. The top of the casing must be effectively sealed against the entrance of water under all conditions of vibration or movement of conductors or cables.ii. The electrical cable must be firmly attached to the drop pipe at twenty-one (21) foot intervals or less, or at each coupling or joint.Idaho Admin. Code r. 58.01.08.511