Section 327IAC3-6-23. Lift station pumps

   (a) Multiple pumps shall be provided in each lift station. If no more than two (2) units are provided in a lift station, each pump shall be rated for the capacity that is capable of pumping the design peak hourly flow.

  (b) Lift station pumps shall be in accordance with the following:

(1) Capable of passing spheres at least three (3) inches in diameter.

(2) Have lift station pump suction and discharge openings at least four (4) inches in diameter.

(3) Positioned at an elevation to allow operation with a positive head under normal operating conditions, with the exception of suction-lift pump stations.

(4) Have individual intakes.

(5) Have a design capacity based on peak hourly flow.

  (c) Electrical switching equipment shall be installed at lift stations to automatically alternate the pumps in use.

  (d) Dry wells shall be equipped with sump pump equipment having:

(1) dual check valves to remove leakage or drainage into the dry well; and

(2) a capacity rating able to remove the maximum pump seal water discharge.

(Water Pollution Control Division; 327 IAC 3-6-23; filed May 17, 1999, 12:11 p.m.: 22 IR 3096; readopted filed Apr 11, 2005, 2:45 p.m.: 28 IR 2470; readopted filed Jun 15, 2011, 11:15 a.m.: 20110713-IR-327110193BFA)