Authority: IC 13-13-5; IC 13-14-8; IC 13-14-9; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-2

Affected: IC 13-11-2; IC 13-15; IC 13-18

Sec. 18. (a) All gravity sewers, force mains, and the accessories to either must be installed in accordance with one (1) of the following:

1. (1) ASTM C12-95*, Standard Practice for Installing Vitrified Clay Pipe Lines.
2. (2) ASTM D2321-89*, Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications.
3. (3) AWWA standard C600-93**, AWWA Standard for Installation of Ductile-Iron Water Mains and Their Appurtenances.
4. (4) AWWA standard C602-89**, AWWA Standard for Cement-Mortar Lining of Water Pipelines–4 In. (100 mm) and Larger–In Place.
5. (5) AWWA standard C603-90**, AWWA Standard for Installation of Asbestos–Cement Pressure Pipe.
6. (6) AWWA standard C605-94**, AWWA Standard for Underground Installation of Polyvinyl Chloride (PVC) Pressure Pipe and Fittings for Water.
7. (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 must be followed.

(c) Continuous and uniform bedding must be provided in the trench for all buried pipe. Backfill material must 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 must be removed.

(e) Sanitary sewers must be covered with at least thirty-six (36) inches of earthen cover measured from the top of the 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, must 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, must be used and compacted for all flexible pipe installation.

(h) Final backfill must:

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

2. (2) not consist of the following:

   1. (A) Debris.
   2. (B) Organic material.
   3. (C) Frozen material.
   4. (D) Unstable materials.
   5. (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.

*These documents are incorporated by reference. Copies may be obtained from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428, www.astm.org, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, 100 North Senate Avenue, Thirteenth Floor, Indianapolis, Indiana 46204.

**These documents are incorporated by reference. Copies may be obtained from American Water Works Association, 6666 W. Quincy Ave., Denver, CO 80235, www.awwa.org, or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North,100 North Senate Avenue, Thirteenth Floor, Indianapolis, Indiana 46204.

(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; readopted filed Jun 29, 2017, 9:34 a.m.: 20170726-IR-327170225BFA; filed Sep 6, 2018, 11:50 a.m.: 20181003-IR- 327170278FRA; readopted filed May 12, 2023, 1:07 p.m.: 20230607-IR-327230079BFA; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA)