Authority: IC 8-23-2-6; IC 8-23-5-10

Affected: IC 8-23-5-10

Sec. 15. (a) Vault materials must comply with INDOT Standard Specifications 807.03*, effective September 1, 2024.

(b) Vaults must be installed under the approved permit plans and specifications. Vault covers are required to be bolted into place to prevent accidental removal by mowing crews or other unintentional means. The cover frame must be installed in the vault with a butyl rubber sealant in tape or coil form for a proper seal and to prevent the frame from moving out of place. The sealant must comply with ASTM C990 for butyl rubber sealants.

(c) Vault rings and covers must be as shown on the plans and under the INDOT Standard Specifications 807.09*, effective September 1, 2024, except the message displayed on the lid must read "INDOT F/O Conduit Bank". Fabrication of these vault covers may not begin until working drawings have been approved by a department engineer.

(d) Vaults must be installed at the planned and potential future fiber optic cable splicing locations and additional locations as shown on the plans.

(e) Material surrounding the buried conduit splices and vaults must be tamped and added in a way that ensures there are no voids or depressions formed. Conduit entrance and exit points in the new vaults must be sealed watertight.

(f) Vaults must be precast. The top of the vault must be flat and level with the surrounding ground.

(g) After installation is complete, the disturbed portions of the construction area must be cleaned, and any excess excavation or other materials properly disposed of immediately.

*These documents are incorporated by reference. Copies of the 2024 Standard Specifications can be found at https://www.in.gov/dot/div/contracts/standards/book/sep23/sep.htm or may be obtained at the Indiana Department of Transportation, 100 North Senate Avenue, Room N730, Indianapolis, IN 46204.

(Indiana Department of Transportation; 105 IAC 16.5-1-15; filed Jun 20, 2025, 1:31 p.m.: 20250716-IR-105250150FRA)