PURPOSE: This rule sets standards for the placement of heat pump wells.

1. (1) A vertical heat pump well shall be located on a site which has good surface drainage and prevents the accumulation of water within ten feet (10') of the well and any buried pipes.

2. (2) Vertical heat pump wells shall not be located within certain distances from pollution or contamination sources. A vertical heat pump well shall be at least—

   1. (A) Three hundred feet (300') from a storage area for commercial fertilizers or chemicals, landfill, lagoon, or above-ground or underground storage tank for petroleum, petroleum products or chemicals.
   2. (B) One hundred feet (100') from a belowgrade manure storage area, cesspool, unplugged abandoned well, subsurface disposal field (lateral field), grave, building or yard used for livestock or poultry, privy or other contaminants that may drain into the ground.
   3. (C) Fifty feet (50') from an existing operating well, septic tank, buried sewer, a pit or unfilled space below ground surface, a sump, except that a well may be drilled closer than fifty feet (50') to a basement or heat pump well.
3. (3) Horizontal heat pump wells should be at least two feet (2') above or below any other intersecting underground piping (to prevent freezing of the water lines) or wiring on the property, except a soaker pipe for the heat pump system used to keep the soil moisture constant.
4. (4) A variance may be granted if set back distances cannot be met. The variance must be obtained in advance from the division.

AUTHORITY: sections 256.606 and 256.626, RSMo 1994.* Emergency rule filed Nov. 16, 1993, effective Dec. 11, 1993, expired April 9, 1994. Original rule filed Aug. 17, 1993, effective March 10, 1994. Amended: Filed Nov. 1, 1995, effective June 30, 1996. *Original authority: 256.606, RSMo 1991 and 256.626, RSMo 1985, amended 1991.