Louisiana Administrative Code › Title 51 - PUBLIC HEALTH-SANITARY CODE › Part XII - Water Supplies › Chapter 3 - Water Quality Standards › Section XII-327 - Ground Water Supplies [formerly paragraph 12:008-1]

Current through Register Vol. 50, No. 6, June 20, 2024
A. All potable ground water supplies shall
				comply with the following requirements.
1.
				[formerly paragraph 12:008-2 Exclusion of Surface Water from Site] The ground
				surface within a safe horizontal distance of the source in all directions shall
				not be subject to flooding (as defined in Footnote 4 of §327. A.2 below) and
				shall be so graded and drained as to facilitate the rapid removal of surface
				water. This horizontal distance shall in no case be less than 50 feet for
				potable water supplies.
2.
				[formerly paragraph 12:008-3 Distances to Sources of Contamination] Every
				potable water well, and the immediate appurtenances thereto that comprise the
				well, shall be located at a safe distance from all possible sources of
				contamination, including but not limited to, privies, cesspools, septic tanks,
				subsurface tile systems, sewers, drains, barnyards and pits below the ground
				surface. The horizontal distance from any such possible source of pollution
				shall be as great as possible, but in no case less than the following minimum
				distances, except as otherwise approved by the state health officer.
Source
Distance in Feet
Septic tanks
50
Storm or sanitary sewer
501
Cesspools, outdoor privies, oxidation ponds,
							 subsurface absorption fields, pits, mechanical sewage treatment plants, etc.
1002
Another water-well
253
Sanitary landfills, feed lots, manure piles, solid
							 waste dumps and similar installations
100
Drainage canal, ditch or stream
504
1 This distance may be reduced to
				  30 feet if the sewer is of cast iron with leaded joints or Schedule 40 plastic
				  pipe with water-tight joints.
2 For a private water well this
				  distance may be reduced to 50 feet.
3 This minimum distance
				  requirement does not take into consideration the effects of interference from
				  pumping nearby wells in the same aquifer.
4 Horizontally measured from the
				  water's edge to the well at the highest water level which may have occurred in
				  a 10-year period.
3.
				[formerly paragraph 12:008-4 Leakage from Toilets and Sewers] No toilet, sewer,
				soil pipe or drain shall be located above or where leakage therefrom can reach
				any water storage basin, reservoir or source of water supply.
4. [formerly paragraph 12:008-5 Pits Near
				Water Supply] There shall be no unauthorized pits or unfilled spaces below
				level of ground surface, any part of which is within 50 feet of such water
				supply, except properly constructed well, pump, or valve pits as covered under
				§329. A.4 of this Part.
5.
				[formerly paragraph 12:008-6 Satisfactory Earth Formation above the Water
				Bearing Stratum] The earth formations above the water-bearing stratum shall be
				of such character and depth as to exclude contamination of the source of supply
				by seepage from the surface of the ground.
6. [formerly paragraph 12:008-7 Minimum Depth
				of Casings and Curbings] All well and spring basin casings or curbings shall
				extend a safe distance below the ground surface. The minimum depth of casings
				or curbings shall not be less than 50 feet in the case of public water supplies
				and not less than 10 feet in the case of private water supplies.
7. [formerly paragraph 12:008-8 Height of
				Casings and Curbings] In wells with pipe casings, the casings shall project at
				least 12 inches above ground level or the top of the cover or floor, and the
				cover or floor shall slope away from the well casing or suction pipe in all
				directions. Dug well linings shall extend at least 12 inches above the ground
				surface and cover installed thereon. The cover shall be watertight, and its
				edges shall overlap and extend downward at least 2 inches over the walls or
				curbings of such wells. In flood-prone areas the top of the casing shall be at
				least 2 feet above the highest flood level which may have occurred in a 10-year
				period, but in no case less than 2 feet above the ground surface.
8. [formerly paragraph 12:008-9 Grouting] The
				annular space between the well casing and the bore hole shall be sealed with
				cement-bentonite slurry or neat cement. Community public supply wells shall be
				cemented to their full depth from the top of the producing aquifer to the
				ground surface; noncommunity public supply wells shall be cemented from a
				minimum depth of 50 feet to the ground surface; and private supply wells shall
				be cemented from a minimum depth of 10 feet to the ground surface.
9. [formerly paragraph 12:008-10 Cover or
				Floors] Every dug well, spring, or other structure used as a source of potable
				water, or for the storage of potable water, shall be provided with a watertight
				cover. Covers and every pump room floor shall be constructed of concrete or
				similar impervious material, and shall be elevated above the adjacent ground
				level and sloped to facilitate the rapid removal of water so as to provide
				drainage from the cover or floor and prevent contamination of the water supply.
				Such cover or floor shall be constructed so that there are no copings,
				parapets, or other features which may prevent proper drainage, or by which
				water can be held on the cover. Concrete floors or cover slabs shall be of such
				thickness and so reinforced as to carry the load which may be imposed upon it,
				but in no case less than 4 inches thick.
10. [formerly paragraph 12:008-11 Potable
				Water Well Seals and Covers] Every potable water well shall be provided with a
				watertight sanitary well seal at the top of the casing or pipe sleeve. For
				wells with solid pedestal foundations, the well casing shall project at least 1
				inch above the level of the foundation, and a seal between the well casing and
				the opening in the pump base plate shall be used to effectively seal the base
				plate to the well casing.
11.
				[formerly paragraph 12:008-12 Potable Water Well Casing Vents] All potable
				water well casings shall be vented to atmosphere as provided in §327. A 12
				below, with the exception that no vent will be required when single-pipe jet
				pumps are used.
12. [formerly
				paragraph 12:008-13 Potable Water Well Vents] All potable water well vents
				shall be so constructed and installed as to prevent the entrance of
				contamination. All vent openings shall be piped water tight to a point not less
				than 24 inches above the highest flood level which may have occurred in a
				10-year period, but in no case less than 24 inches above the ground surface.
				Such vent openings and extensions thereof shall be not less than 1/2 inch in
				diameter, with extension pipe firmly attached thereto. The openings of the vent
				pipes shall face downward and shall be screened to prevent the entrance of
				foreign matter.
13. [formerly
				paragraph 12:008-14 Manholes] Manholes may be provided on dug wells,
				reservoirs, tanks, and other similar water supply structures. Every such
				manhole shall be fitted with a watertight collar or frame having edges which
				project at least 2 inches above the level of the surrounding surface, and shall
				be provided with a solid watertight cover having edges which overlap and
				project downward at least 2 inches around the outside of the frame. The cover
				shall be kept locked at all times, except when it is necessary to open the
				manhole.
14. [formerly paragraph
				12:008-15 Well Construction Standards] All wells constructed to serve a potable
				water supply shall be constructed in accordance with
Louisiana Water
				Well Rules, Regulations, and Standards
. Drillers of wells to serve a
				potable water supply will comply with the requirements for licensing of water
				well drillers under state Act No. 715 of 1980 (R.S.
				38:2226, 38:3098-3098.8) which is
				administered by the Louisiana Office of Public Works.
15. [formerly paragraph 12:008-16 Sampling
				Tap] All potable water supply wells shall be provided with a readily accessible
				faucet or tap on the well discharge line at the well for the collection of
				water samples. The faucet or tap shall be of the smooth nozzle type, shall be
				upstream of the well discharge line check valve and shall terminate in a
				downward direction.
16. [formerly
				paragraph 12:008-17 Disinfection of Wells] All new wells or existing wells on
				which repair work has been done shall be disinfected before being put into use
				as prescribed in §353. A of this Part.