Section 327IAC3-6-18. Installation

   (a) All gravity sewers, force mains, and the accessories to either shall be installed in accordance with the one of the following:

(1) ASTM C12-95, Standard Practice for Installing Vitrified Clay Pipe Lines.

(2) ASTM D2321-89, Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications.

(3) AWWA standard C600-93, AWWA Standard for Installation of Ductile-Iron Water Mains and Their Appurtenances.

(4) AWWA standard C602-89, AWWA Standard for Cement-Mortar Lining of Water Pipelines—4 In. (100 mm) and Larger—In Place.

(5) AWWA standard C603-90, AWWA Standard for Installation of Asbestos—Cement Pressure Pipe.

(6) AWWA standard C605-94, AWWA Standard for Underground Installation of Polyvinyl Chloride (PVC) Pressure Pipe and Fittings for Water.

(7) AWWA standard C606-87, AWWA Standard for Grooved and Shouldered Joints.

  (b) If an ASTM or AWWA standard as allowed by subsection (a) is not applicable for the particular installation, the manufacturer's recommended installation procedure shall be followed.

  (c) Continuous and uniform bedding shall be provided in the trench for all buried pipe. Backfill material shall be tamped in layers around the pipe and to a height above the pipe capable to support and protect the pipe.

  (d) All ledge rock, boulders, and stones unable to pass through an opening of two (2) inches that are found in the trench within four (4) inches of the outside edge of all sewer pipe shall be removed.

  (e) Sanitary sewers shall be covered with at least thirty-six (36) inches of earthen cover measured from the top of pipe to the proposed finish grade.

  (f) Bedding classes A, B, C, or crushed stone as described in ASTM C12-95, Standard Practice for Installing Vitrified Clay Pipe Lines, shall be used and compacted for all rigid pipe installation.

  (g) Embedment materials for bedding, haunching, and initial backfill, Class I, II, or III as described in ASTM D2321-89, Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications, shall be used and compacted for all flexible pipe installation.

  (h) Final backfill shall:

(1) be placed in a manner that will not disturb the sanitary sewer pipe; and

(2) not consist of the following:

(A) Debris.

(B) Organic material.

(C) Frozen material.

(D) Unstable materials.

(E) Boulders or stones unable to pass through an opening of two (2) inches that are placed within two (2) feet of the sewer pipe as measured radially from the outside edge of the sewer.

(Water Pollution Control Division; 327 IAC 3-6-18; filed May 17, 1999, 12:11 p.m.: 22 IR 3094; errata filed Dec 1, 2000, 5:25 p.m.: 24 IR 1033; readopted filed Apr 11, 2005, 2:45 p.m.: 28 IR 2470; readopted filed Jun 15, 2011, 11:15 a.m.: 20110713-IR-327110193BFA)