NAC445A.66955. Springs: Covering of device for collection of water.

Except as otherwise justified by an engineer and approved by the Division or the appropriate district board of health, a device for the collection of water from a spring which is used as a source of water for a public water system, whether the device consists of collection tile, perforated PVC, infiltration boxes or tunnels, must be:

     1. Covered with a minimum of 10 feet of impervious soil cover that extends a minimum of 15 feet in all horizontal directions up gradient from the device for the collection of water; or

     2. Where it is impossible to comply with the requirements of subsection 1, covered with an impermeable liner. If an impermeable liner is necessary:

     (a) The liner must have a total thickness of at least 12 mils and all seams of the liner must be folded or welded in such a manner as to prevent leakage.

     (b) The liner must be determined to be compatible with drinking water.

     (c) The liner must be installed in such a manner as to ensure its integrity. There must not be any stones that are 2 inches or more in any dimension, or that have any sharp edges, located within 6 inches of the liner.

     (d) A minimum of 2 feet of relatively impervious soil cover must be placed over the liner.

     (e) The liner and soil cover must extend a minimum of 15 feet in all horizontal directions up gradient from the device for the collection of water.

Ê If warranted by the physical circumstances of a particular spring, the Division or the appropriate district board of health may require more stringent criteria for the design of an impermeable liner than the criteria set forth in this subsection.

     (Added to NAC by Bd. of Health, eff. 2-20-97; A by Environmental Comm’n by R194-08, 10-27-2009)