Section 25-128-39a - Geothermal bore holes(a) The inside diameter of closed-loop geothermal bore holes shall be in accordance with the geothermal system manufacturer's specifications to allow for the proper installation of piping and grout. Where a single heat exchange pipe with no u-bend is in contact with the grout, as in a concentric system where an internal supply pipe is suspended and completely surrounded by an external heat exchange pipe, the size of the bore hole shall be in accordance with the manufacturer's specifications in order to provide for proper grouting via the tremie method.(b) Open-loop geothermal bore holes shall be constructed in a manner that complies with all water supply well requirements, including the separating distances to sources of pollution set forth in section 19-13-B51d of the Regulations of Connecticut State Agencies.Conn. Agencies Regs. § 25-128-39a