(4) Source Protection. Public drinking water systems are responsible for protecting their sources from contamination. The selection of a well location shall only be made after consideration of the requirements of R309-600. Sources shall be located in an area that will minimize threats from existing or potential sources of pollution.
Generally, sewer lines may not be located within zone one and zone two of a public drinking water system's source protection zones. However, if the following precautions are taken, sewer lines may be permitted within a public drinking water system's source protection zone one and zone two. Sewer lines shall meet the conditions identified in R309-600-13(3), and shall be specially constructed as follows throughout zone one in aquifers classified as protected, and zones one and two, if the aquifer is classified as unprotected.
(a) Sewer lines shall be constructed to remain watertight. The lines shall be deflection-tested in accordance with the Division of Water Quality Rule R317-3. The lines shall be video-inspected for any defect following completion of construction and before being placed in service. The sewer pipe material shall be: (i) high density polyethylene (HDPE) pipe with a PE3408 or PE4710 rating from the Plastic Pipe Institute and have a Dimension Ratio (DR) of 17 or less, and all joints shall be fusion-welded; or,(ii) polyvinyl chloride (PVC) pipe meeting AWWA Specification C900 or C905 and have a DR of 18 or less. PVC pipe shall be either restrained gasketed joints or shall be fusion-welded. Solvent cement joints shall not be acceptable. The PVC pipe shall be clearly identified when installed, by marking tape or other means as a sanitary sewer line; or,(iii) ductile iron pipe with ceramic epoxy lining, polyethylene encasement, restrained joints, and a minimum pressure class of 200.(b) Procedures for leakage tests shall be specified and comply with Division of Water Quality Rule R317-3 requirements.(c) Lateral to main connection shall be fusion-welded, shop-fabricated, or saddled with a mechanical clamping watertight device designed for the specific pipe.(d) Inlet and outlet sewer pipes shall be joined to a manhole with a gasketed flexible watertight connection.(e) The sewer pipe shall be laid with no greater than 2 percent deflection at any joint.(f) Backfill shall be compacted to not less than 95 percent of maximum laboratory density as determined in accordance with ASTM Standard D-690.(g) Sewer manholes shall meet the following requirements. (i) The manholes shall be constructed of reinforced concrete.(ii) Manhole base and walls, up to a point at least 12 inches above the top of the upper most sewer pipe entering the manhole, shall be fabricated in a single concrete pour without joints.(iii) The manholes shall be air pressure tested after installation.(h) In unprotected aquifers, an impermeable cutoff wall shall be constructed in all sewer trenches on the up-gradient edge of zone two. In protected aquifers, an impermeable cutoff wall shall be constructed in all sewer trenches on the up-gradient edge of zone one.(6) Well Materials, Design, and Construction. (a) ANSI/NSF Standards 60 and 61 Certification. All interior surfaces must consist of products complying with ANSI/NSF Standard 61. This requirement applies to drop pipes, well screens, coatings, adhesives, solders, fluxes, pumps, switches, electrical wire, sensors, and all other equipment or surfaces which may contact the drinking water.
All substances introduced into the well during construction or development shall be certified to comply with ANSI/NSF Standard 60. This requirement applies to drilling fluids (biocides, clay thinners, defoamers, foamers, loss circulation materials, lubricants, oxygen scavengers, viscosifiers, weighting agents) and regenerants.
(b) Permanent Steel Casing Pipe shall: (i) be new single steel casing pipe meeting AWWA Standard A-100, ASTM or API specifications and having a minimum weight and thickness as given in Table 6 found in R655-4-11.2.3 of the Utah Administrative Code (Administrative Rules for Water Well Drillers, adopted April 11, 2011, Division of Water Rights);(ii) have additional thickness and weight, if minimum thickness is not considered sufficient to assure reasonable life expectancy of the well;(iii) be capable of withstanding forces to which it is subjected;(iv) be equipped with a drive shoe when driven;(v) have full circumferential welds or threaded coupling joints; and(vi) project at least 18 inches above the anticipated final ground surface and at least 12 inches above the anticipated pump house floor level. At sites subject to flooding, the top of the well casing shall terminate at least three feet above the 100-year flood level or the highest known flood elevation, whichever is higher.(c) Non-Ferrous Casing Material. The use of any non-ferrous material for a well casing shall receive prior approval of the Director based on the ability of the material to perform its desired function. Thermoplastic water well casing pipe shall meet AWWA Standard A100-06 and shall bear the logo NSF-wc indicating compliance with NSF Standard 14 for use as well casing.
(d) Disposal of Cuttings. Cuttings and waste from well drilling operations shall not be discharged into a waterway, lake, or reservoir. The rules of the Utah Division of Water Quality must be observed with respect to these discharges.
(e) Packers. Packers, if used, shall be of material that will not impart taste, odor, toxic substances, or bacterial contamination to the well water. Lead or partial lead packers are specifically prohibited.
(f) Screens. The use of well screens is recommended where appropriate and, if used, they shall:
(i) be constructed of material resistant to damage by chemical action of groundwater or cleaning operations;(ii) have size of openings based on sieve analysis of formations or gravel pack materials;(iii) have sufficient diameter to provide adequate specific capacity and low aperture entrance velocities;(iv) be installed so that the operating water level remains above the screen under all pumping conditions; and,(v) be provided with a bottom plate or wash-down bottom fitting of the same material as the screen.(g) Plumbness and Alignment Requirements. Every well shall be tested for plumbness and vertical alignment in accordance with AWWA Standard A100. Plans and specifications submitted for review shall:
(i) have the test method and allowable tolerances clearly stated in the specifications; and,(ii) clearly indicate any options the design engineer may have if the well fails to meet the requirements. Generally, wells may be accepted if the misalignment does not interfere with the installation or operation of the pump or uniform placement of grout.(h) Casing Perforations. The placement of perforations in the well casing shall:
(i) be located, as far as practical, to permit the uniform collection of water around the circumference of the well casing; and,(ii) be of dimensions and size to restrain the water bearing soils from entrance into the well.(i) Well Sealing Techniques and Requirements. For all public drinking water wells, the annulus between the outermost well casing and the borehole wall shall be sealed with grout to a depth of at least 100 feet below the ground surface unless an "exception" is issued by the Director (see R309-500-4(1) ). If more than one casing is used, including a conductor casing, the annulus between the outermost casing and the next inner casing shall be sealed with grout (meeting the sealing materials requirements of R309-515-6(i)(ii) herein) or with a water tight steel ring having a thickness equal to that of the permanent well casing and continuously welded to both casings. If a public drinking water well will be equipped with a pitless adapter or unit, a well seal shall be installed to a minimum depth of 110 feet to take into account the top 10 feet of compromised seal interval.
The following shall apply to all drinking water wells:
(i) Consideration During Well Construction. (A) Sufficient annular opening shall be provided to permit a minimum of two inches of grout between the outermost permanent casing and the drilled hole, taking into consideration any joint couplings.(B) The casing(s) must be placed to permit unobstructed flow and uniform thickness of grout.(ii) Sealing Materials. (A) Neat Cement Grout. Cement, conforming to ASTM Standard C150, and water, with no more than six gallons of water per sack of cement, shall be used for two-inch openings. Additives may be used to increase fluidity subject to approval by the Director.
(B) Concrete Grout. Equal parts of cement conforming to ASTM Standard C150, and sand, with not more than six gallons of water per sack of cement, may be used for openings larger than two inches.
(C) Clay Seal. Where an annular opening greater than six inches is available, a seal of swelling bentonite meeting the requirements of R655-4-11.4.2 may be used when approved by the Director.
(iii) Application. (A) When the annular opening is less than four inches, grout shall be installed under pressure, by means of a positive displacement grout pump, from the bottom of the annular opening to be filled.(B) When the annular opening is four or more inches and 100 feet or less in depth, and concrete grout is used, it may be placed by gravity through a grout pipe installed to the bottom of the annular opening in one continuous operation until the annular opening is filled.(C) All temporary construction casings shall be removed prior to or during the well sealing operation. Any exceptions shall be approved by the State Engineer's Office, and evidence of State Engineer's Office's approval shall be submitted to the Director (see R655-4-11.4.3.1 for conditions concerning leaving temporary surface casing in place). A temporary construction casing is a casing not intended to be part of the permanent well.(D) When a "well in a protected aquifer" classification is desired, the grout seal shall extend from the ground surface down to at least 100 feet below the surface, and through the protective clay layer (see R309-600-6(1)(x) ).(E) After cement grouting is applied, work on the well shall be discontinued until the cement or concrete grout has properly set, usually a period of 72 hours. (j) Water Entered Into Well During Construction. Any water entering a well during construction shall not be contaminated and should be obtained from a chlorinated municipal system. Where this is not possible, the water must be treated to produce a 100 mg/l free chlorine residual in accordance with R655-4-11.6.5.
(k) Gravel Pack Wells. The following shall apply to gravel packed wells:
(i) the gravel pack material shall be of well-rounded particles, at least 90 percent siliceous material, no more than five percent acid solubility, smooth and uniform, free of foreign material, properly sized, washed, and then disinfected immediately prior to or during placement;(ii) the gravel pack shall be placed in one uniform continuous operation;(iii) refill pipes, when used, shall be Schedule 40 steel pipe incorporated within the pump foundation and terminated with screwed or welded caps at least 12 inches above the pump house floor or concrete apron;(iv) refill pipes located in the grouted annular opening shall be surrounded by a minimum of 1.5 inches of grout;(v) protection shall be provided to prevent leakage of grout into the gravel pack or screen; and,(vi) any casings not withdrawn entirely shall meet requirements of R309-515-6(6)(b) or R309-515-6(6)(c). (12) Well Equipping. (a) Naturally Flowing Wells. Naturally flowing wells shall:
(i) have the discharge controlled by valves;(ii) be provided with permanent casing and sealed by grout; and,(iii) if erosion of the confining bed adjacent to the well appears likely, special protective construction may be required by the Director.(b) Well Pumps. (i) The design discharge rate of the well pump shall not exceed the rate used during the constant- rate aquifer drawdown test.(ii) Wells equipped with line shaft pumps shall: (A) have the casing firmly connected to the pump structure or have the casing inserted into the recess extending at least 0.5 inches into the pump base;(B) have the pump foundation and base designed to prevent fluids from coming into contact with joints between the pump base and the casing;(C) be designed such that the intake of the well pump is at least ten feet below the maximum anticipated drawdown elevation; and,(D) avoid the use of oil lubrication for pumps with intake screens set at depths less than 400 feet (see R309-105-10(7) and/or R309-515-8(2) for additional requirements of lubricants).(iii) Where a submersible pump is used: (A) the top of the casing shall be effectively sealed against the entrance of water under all conditions of vibration or movement of conductors or cables;(B) the electrical cable shall be firmly attached to the riser pipe at 20-foot intervals or less; and,(C) the intake of the well pump must be at least ten feet below the maximum anticipated drawdown elevation.(c) Pitless Well Units and Adapters. If the excavation surrounding the well casing allowing installation of the pitless unit compromises the surface seal, the competency of the surface seal shall be restored. Torch-cut holes in the well casing shall be to neat lines closely following the outline of the pitless adapter and completely filled with a competent weld with burrs and fins removed prior to the installation of the pitless unit and adapter.
Pitless well units and adapters shall:
(i) be used to make a connection to a water well casing that is made below the ground. A below-the- ground connection shall not be submerged in water during installation;(ii) terminate at least 18 inches above final ground elevation or three feet above the highest known flood elevation, whichever is greater;(iii) contain a label or have a certification indicating compliance with the Water Systems Council Pitless Adapter Standard (PAS-97);(iv) have suitable access to the interior of the casing in order to disinfect the well;(v) have a suitable sanitary seal or cover at the upper terminal of the casing that will prevent the entrance of any fluids or contamination, especially at the connection point of the electrical cables;(vi) have suitable access so that measurements of static and pumped water levels in the well can be obtained;(vii) allow at least one check valve within the well casing;(viii) be furnished with a cover that is lockable or otherwise protected against vandalism or sabotage;(ix) be shop-fabricated from the point of connection with the well casing to the unit cap or cover;(x) be of watertight construction throughout;(xi) be constructed of materials at least equivalent to and having wall thickness compatible to the casing;(xii) have field connection to the lateral discharge from the pitless unit of threaded, flanged, or mechanical joint connection;(xiii) be threaded or welded to the well casing. If the connection to the casing is by field weld, the shop-assembled unit must be designed specifically for field welding to the casing. The only field welding permitted on the pitless unit is to connect the pitless unit to the casing; and,(xiv) have an inside diameter as great as that of the well casing, up to and including casing diameters of 12 inches, to facilitate work and repair on the well, pump, or well screen.(d) Well Discharge Piping. The discharge piping shall:
(i) be designed so that the friction loss will be low;(ii) have control valves and appurtenances located above the pump house floor when an above-ground discharge is provided;(iii) be protected against the entrance of contamination;(iv) be equipped with a smooth-nosed sampling tap, a check valve, a pressure gauge, a means of measuring flow, and a shutoff valve (with the smooth-nosed sampling tap being the first item from the well head and the shut-off valve as the last item), unless it is a naturally flowing well which may need an alternative design;(v) where a well pumps directly into a distribution system, be equipped with an air release vacuum relief valve located upstream from the check valve, with exhaust/relief piping terminating in a down-turned position at least six inches above the well house floor and covered with a No. 14 mesh corrosion resistant screen. An air release vacuum relief valve is not required if the specific proposed well head valve and piping design includes provisions for pumping to waste all trapped air before water is introduced into the distribution system;(vi) have all exposed piping valves and appurtenances protected against physical damage and freezing;(vii) be properly anchored to prevent movement;(viii) be properly protected against surge or water hammer; and,(ix) if a pump to waste line exists, it shall not be connected to a sewer/storm drain without a minimum 12-inch clearance to the flood rim, and the discharge end of the pump-to-waste line shall be downturned and covered with a No. 4 mesh corrosion resistant screen (refer to R309-545-10(1) ).(e) Water Level Measurement. (i) Provisions shall be made to permit periodic measurement of water levels in the completed well.(ii) Where permanent water level measuring equipment is installed, it shall be made using corrosion resistant materials attached firmly to the drop pipe or pump column and installed to prevent entrance of foreign materials.(f) Observation Wells. Observation wells shall be:
(i) constructed in accordance with the requirements for permanent wells if they are to remain in service after completion of a water supply well; and,(ii) protected at the upper terminal to preclude entrance of foreign materials.(g) Electrical Protection. Sufficient electrical controls shall be placed on all pump motors to eliminate electrical problems due to phase shifts, surges, lightning, etc.
(13) Well House Construction. The use of a well house is strongly recommended, particularly in installations utilizing above ground motors.
In addition to applicable provisions of R309-540, well pump houses shall conform to the following:
(a) Casing Projection Above Floor. The permanent casing for all ground water wells shall project at least 12 inches above the pump house floor or concrete apron surface and at least 18 inches above the final ground surface. However, casings terminated in underground vaults may be permitted if the vault is provided with a "drain-to-daylight" sized to handle in excess of the well flow and surface runoff is directed away from the vault access.
(b) Floor Drain. Where a well house is constructed, the floor surface shall be at least six inches above the final ground elevation and shall be sloped to provide drainage. A "drain-to-daylight" shall be provided unless highly impractical.
(c) Earth Berm. Sites subject to flooding shall be provided with an earth berm terminating at an elevation at least two feet above the highest known flood elevation or other suitable protection as determined by the Director.
(d) Well Casing Termination at Flood Sites. The top of the well casing at sites subject to flooding shall terminate at least three feet above the 100-year flood level or the highest known flood elevation, whichever is higher (refer to R309-515-6(6)(b)(vi) ).
(e) Miscellaneous. The well house shall be ventilated, heated, and lighted in such a manner as to assure adequate protection of the equipment (refer to R309-540-5(2) (a) through (h) ).
(f) Fencing. Where necessary to protect the quality of the well water, the Director may require that certain wells be fenced in a manner similar to fencing required around spring areas.
(g) Access. An access shall be provided either through the well house roof or sidewalls in the event the pump must be pulled for replacement or servicing the well.