Spring Sources

Written approval by the Department is required before water from any new or reconstructed spring source may be served to the public. For new spring sources, the Department will require a site evaluation report containing applicable required information listed in Subsection 510.01. This information includes, but is not limited to, the following: an evaluation of the potability and quality of anticipated spring water; an estimate of hydrologic and geologic properties of the aquifer; and a description of potential sources of contamination within five hundred (500) feet of the spring. Any supplier of water for a PWS served by one (1) or more springs must ensure that the following requirements are met: (7-1-24) 01. Protection of the Spring. Springs must be housed in a permanent structure and protected from contamination including the entry of surface water, animals, and dust. (7-1-24) 02. Spring Box or Combined Spring Box/Finished Water Storage Design. To facilitate efficient design and review of spring box or combined spring box/finished water storage designs, these site-specific designs must be coordinated in advance with the Department. Specific issues to be addressed are: (7-1-24) a. The inlet must be screened as determined by the Department and located above the floor of the collection chamber. (7-1-24) b. Unless otherwise approved by the Department, the spring box or combined spring box/finished water storage tank must meet the applicable design requirements of Section 544 - Facility and Design Standards: General Design of Finished Water Storage. (7-1-24) 03. Sample Tap. A sample tap suitable for collecting bacteriological samples must be provided as required by Subsection 501.09.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. (7-1-24) 04. Flow Measurement. A flow meter or other flow measuring device must be provided. (7-1-24) 05. Protected Area. The entire area within a one hundred (100) foot radius of the spring box and collection piping must be owned by the supplier of water or controlled by a long term lease, secured to prevent trespass or livestock and void of buildings, dwellings and any potential sources of contamination. Surface water must be diverted from this area. (7-1-24) 515. SURFACE SOURCES AND GROUNDWATER SOURCES UNDER THE DIRECT INFLUENCE OF SURFACE WATER. Written approval by the Department is required before water from any new surface source or groundwater source that is under the direct influence of surface water may be served to the public. Infiltration collection lines or galleries are considered groundwater under the direct influence of surface water unless demonstrated otherwise. Infiltration galleries that are not directly influenced by surface water must meet the requirements of Section 514. The area around infiltration lines must be under the control of the water purveyor for a distance acceptable to the Department. (7-1- 24) 01. Intake Structures. Design of intake structures must provide for: (7-1-24) a. Withdrawal of water from more than one (1) level if quality varies with depth. (7-1-24) b. Separate facilities for release of less desirable water held in storage. (7-1-24) c. Where frazil ice may be a problem, holding the velocity of flow into the intake structure to a minimum, generally not to exceed point five (0.5) feet per second. Frazil ice is made up of randomly distributed ice crystals that are formed in flowing water that has cooled below thirty-two (32) degrees Fahrenheit and is prevented IDAHO ADMINISTRATIVE CODE IDAPA 58.01.08 Department of Environmental Quality Idaho Rules for Public Drinking Water Systems Section 515 Page 58 from forming into ice sheets by the movement of the water. (7-1-24) d. Inspection manholes every one thousand (1000) feet for pipe sizes large enough to permit visual inspection. (7-1-24) e. Cleaning the intake line as needed. (7-1-24) f. Adequate protection against rupture by dragging anchors, ice, or other hazards. (7-1-24) g. Ports located above the bottom of the stream, lake or impoundment, but at sufficient depth to be kept submerged at low water levels. (7-1-24) h. Where shore wells are not provided, a diversion device capable of keeping large quantities of fish or debris from entering an intake structure. (7-1-24) i. If necessary, provisions must be made in the intake structure to control the influx of nuisance aquatic organisms. Specific control methods must be approved by the Department. (7-1-24) j. When buried surface water collectors are used, sufficient intake opening area must be provided to minimize inlet head loss. Particular attention must be given to the selection of backfill material in relation to the collector pipe slot size and gradation of the native material over the collector system. (7-1-24) 02. Raw Water Pumps. Raw water pumping wells must: (7-1-24) a. Have motors and electrical controls located above grade (except for submersible pumps) and protected from flooding as required by the Department. (7-1-24) b. Be accessible and designed to prevent flotation. (7-1-24) c. Be equipped with removable or traveling screens before the pump suction well. (7-1-24) d. Provide for introduction of chlorine or other chemicals in the raw water transmission main if necessary for quality control. (7-1-24) e. Where practical, have intake valves and provisions for back flushing or cleaning by a mechanical device and testing for leaks. (7-1-24) f. Have provisions for withstanding surges where necessary. (7-1-24) 03. Off-stream Raw Water Storage. An off-stream raw water storage reservoir is a facility into which water is pumped during periods of good quality and high stream flow for future release to treatment facilities. These off-stream raw water storage reservoirs must be constructed to assure that: (7-1-24) a. Water quality is protected by controlling runoff into the reservoir. (7-1-24) b. Dikes are structurally sound and protected against wave action and erosion. (7-1-24) c. Intake structures and devices meet requirements of Subsection 515.01. (7-1-24) d. Point of influent flow is separated from the point of withdrawal. (7-1-24) e. Separate pipes are provided for influent to and effluent from the reservoir. (7-1-24) 04. Reservoirs. Impoundments and reservoirs must provide, where applicable: (7-1-24) a. Removal of brush and trees to high water elevation. (7-1-24) IDAHO ADMINISTRATIVE CODE IDAPA 58.01.08 Department of Environmental Quality Idaho Rules for Public Drinking Water Systems Section 518 Page 59 b. Protection from floods during construction. (7-1-24) c. Wells which will be inundated by the reservoir must be abandoned in accordance with requirements of the Idaho Department of Water Resources. See Rules of the Idaho Department of Water Resources referenced in Subsection 002.02. (7-1-24) 516. -- 517. (RESERVED)