(b) Driven wells.

1. (1) On all driven wells there shall be an outer casing grouted from ground surface to a minimum ten feet (10’) depth.
2. (2) Plastic or steel casing that will accommodate the outside diameter of the pipe being driven shall be placed in a hole that has a minimum diameter of four inches (4”) larger than the surface casing.
3. (3) This should give a minimum of two inches (2”) thickness of grout.

(c) Dug or bored wells.

1. (1) Every dug or bored well shall have a continuous watertight lining of steel casing or concrete pipe extending from above ground surface to a depth of at least ten feet (10’) below the ground surface.
2. (2) When more than one (1) formation bearing suitable water exists, the lower formation should be used.

3. (3) The lining in the producing zone shall:

   1. (A) Readily admit water; and
   2. (B) Be structurally sound to withstand external pressures.

(d) Annular openings.

1. (1) The open space between the excavation and the installed lining shall be sealed with grout.
2. (2) If the first ten feet (10’) of the casing is jointed, such as concrete, and would allow surface water to seep into cracks of casing, the grout will continue from the ten-foot seal to ground level.

(e) Upper terminal.

1. (1) The watertight lining shall extend at least eight inches (8”) above finished ground surface.
2. (2) A cover slab at least two and one-half inches (2 1/2") thick, adequately reinforced and having a diameter sufficient to overlap the lining by two inches (2”) shall be provided.
3. (3) 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.
4. (4) A manhole, if installed, shall consist of a metal curb cast in the slab and extending four inches (4”) above the slab.
5. (5) The manhole shall have a watertight covering having sides to overhang the curb at least two inches (2”).
6. (6) Adequately sized pipe (plastic pipe may be used) shall be cast in place in the slab, extending at least eight inches (8”) above the slab, to accommodate the type of pump or pump piping proposed for the well.
7. (7) If the well contractor does not install the pump, a cap (seal) will be placed on top of the pipe.
8. (8) The owner or licensed driller may cut off the cap and must leave a minimum of two inches (2”) above the slab.