New-State Well Codes

All water used during construction, development, and stimulation must be obtained from approved public water supply, or groundwater disinfected with min chlorine concentration of 25 mg/L, or flowing surface water upstream from sewer plant, feedlot, chemical storage or other sources of contamination and disinfected to min of 100 mg/L (50 mg/L when polymer or bentonite is used) with contact time of 1 hr and residual of 10 mg/L. For reverse rotary construction (only if public or groundwater source requirements not met) flowing surface supplies may be used with disinfection to min concentration of 25 mg/L or the well is disinfected in accordance with the provisions of Rule 6.9.1 (also see Rule 15.7). All wells constructed using water from non-public water supply source shall be flushed, cleaned and disinfected upon completion with min chlorine concentration of 500 mg/L with minimum of 12 hour contact time. Use of water from lakes, ponds or known contaminated groundwater sources is prohibited.

Must be installed on grouted surface casing within 5 ft. of bottom, and max. 50 ft. grouted intervals of production casing, or top and bottom if casing <50 ft.

All cutting removed prior to placement. If needed, centralizers shall be metal (same as casing), plastic, or non-degradable material.

Shall meet NSF 14 including ASTM F480 requirements, as well as Filament Wound Resin Pipe-ASTM D2996, Cetrifugally Cast Resin Pipe-ASTM D2997, Reinforced Plastic Mortar Pressure Pipe-ASTM D3517, Glass Fiber Reinforced Resin Pressure Pipe-AWWA C950.

Excessive sediment complaints or wells that produce more than 5 mg/L of sediment, sampling process using EPA Test Method 160.5 (Imhoff Cone) and USGS approved 500 ml sample bottles shall be followed, steps described in 9.2.1.2. The bottles are to be sealed and labeled with date and initials of the person collecting the sample, and a “Chain of Custody” form shall be completed by the employee who completed the sampling. Samples shall be placed on ice and kept at cool temps until delivered to qualified water quality testing laboratory with 72 hrs of collection.

Not allowed for well abandonment in the unsaturated zone (above water level).

Watertight lining shall extend at least 8 in. above finished ground surface. A cover slab at least 2 1/2 in. thick, adequately reinforced with a diameter sufficient to overlap the lining by 2 in. shall be provided. The top of the slab shall be sloped to drain to all sides and a watertight joint made where the slab rests on the well lining using cement mortar or a mastic compound. A manhole, if installed, shall consist of a metal curb cast in the slab and extending 4 in. above the slab. The manhole shall have a watertight covering having sides to overhang the curb at least 2 in. Adequate sized pipe (plastic pipe may be used) shall be cast in place in the slab, extending at least 8 in. above the slab, to accommodate the type of pump or pump piping proposed for the well. If the well contractor does not install the pump, a cap (seal) will be placed on top of the pipe. The owner or licensed driller may cut off the cap and must leave a minimum of 2 in. above the slab.

Shall have a continuous watertight lining of steel casing or concrete pipe extending from above ground surface to a depth of at least ten (10) feet below the ground surface. If more than one water-bearing formation, the lower formation should be used. Lining in the producing zone shall readily admit water and shall be structurally sound to withstand external pressures.

A minimum of the upper ten (10) feet shall be filled with grout after the casing is in place.

Must be made to ASTM F480, must be manufactured as water well casing and marked permanently as well casing. Must be strong enough to withstand formation and hydrostatic pressures. Cannot be driven.

See well spacing well rules R12-15-1302 through R12-15-1307.

Shall have watertight curbing extending at minimum 1 ft. above surface down to static water level, or into confining formation if well is artesian. Curbing shall consist of poured cement grout with a minimum thickness of 6 in., or casing with cement grout within a minimum of 3 in. annular space, concrete block with grout, or rock with cement grout may also be used. Must be sealed at the surface with a watertight, tamper-resistant cover.

Well casing shall extend into the confining formation immediately overlying the artesian aquifer and shall be grouted from a minimum of 10 ft. into the confining formation to the land surface. If the well flows at land surface, it shall be equipped with a control valve, or means of completely controlling the flow, and be available for inspection at all times. If leaks occur adjacent to the well or around the well casing, within 30 days the well shall be completed with the seals, packers, or casing and grouting necessary to eliminate such leakage or the well shall be abandoned according to R12-15-816.

75 ft. minimum separation distance, includes industrial discharge line, or other potential source of contamination, such as domestic animal or agricultural waste. The Dept. has the discretion to require a greater separation distance.