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D.C. Municipal Regulations (Last Updated: September 13, 2017) |
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Title 21. WATER AND SANITATION |
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Chapter 21-18. WELL CONSTRUCTION, MAINTENANCE, AND ABANDONMENT STANDARDS |
Section 21-1815. WELL CONSTRUCTION REQUIREMENTS: WELL CASING
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1815.1No person shall use well casing materials, well fittings, or well equipment that creates a condition which poses a hazard to public health and safety or the environment or results in violations of District or federal laws or regulations.
1815.2Materials to be used for well casing must be appropriate for on-site application and approved by the American Society for Testing and Materials (ASTM), the American Water Works Association, or the NSF International.
1815.3A well casing shall be strong enough to withstand the structural load and stresses imposed by conditions inside and outside the well during and after construction.
1815.4A well casing shall be in good condition, free of pits, breaks, or cracks that may compromise the structural integrity or water-tightness of the well casing.
1815.5Except for pre-packed wells installed using direct push technology, the diameter of the borehole shall be sized to accommodate the well casing and the well annulus requirements specified in § 1818.4.
1815.6A plastic well casing shall be manufactured of polyvinylchloride (PVC) material and shall be at a minimum Schedule 40 or have a minimum standard dimension ratio of twenty-one (21).
1815.7A well constructed with plastic PVC material shall not exceed a depth greater than one hundred and fifty feet (150 ft.).
1815.8If steel casing is used:
(a)The casing shall be new, seamless or electric-resistance welded, galvanized, or black steel. Galvanizing shall be done in accordance with the requirements of ASTM A53/A53M-07, as amended;
(b)The casing, threads, and couplings shall meet or exceed the specifications of ASTM A53/A53M-07 or A589/589M-06, as amended; and
(c)The casing thickness shall meet or exceed the following specifications, unless an alternative thickness is approved in the well construction work plan:
(1)Steel well casing up to and including a nominal size of six inches (6 in.) in diameter shall be at minimum Schedule 40; or
(2)Steel well casing larger than six inches (6 in.) in diameter shall be at the minimum 0.280 inches.
1815.9If thermoplastic casing is used:
(a)The casing shall be new; and
(b)The casing and joints shall meet or exceed all the specifications of ASTM F480-06b, except that the outside diameters shall not be restricted to those listed in ASTM F480-06b.
1815.10A steel casing shall be used for a well constructed in crystalline rocks, unless an alternative casing is approved in the well construction work plan.
1815.11Joints for a well casing shall meet the following requirements:
(a)All joints shall be water tight;
(b)All joints shall be joined in accordance with the manufacturer’s recommendations;
(c)Joints for steel well casing shall be electrically welded or threaded; and
(d)Joints for plastic well casing shall be threaded and not glued.
1815.12A temporary well casing and liner shall be of such minimum thickness as required to withstand the structural load imposed by conditions inside and outside the well.