Authority: IC 13-13-5; IC 13-14-8-7; IC 13-14-9; IC 13-18-3; IC 13-18-16
Affected: IC 13-11-2-140.8; IC 13-18
Sec. 1.
In addition to the definitions in IC 13-11-2 and 327 IAC 8-1, the following definitions apply throughout this rule, 327 IAC 8-2.1, 327 IAC 8-2.3, 327 IAC 8-2.5, and 327 IAC 8-2.6:
is the inactivation ratio. The sum of the inactivation ratios or total inactivation ratio shown as:
is calculated by adding together the inactivation ratio for each disinfection sequence. A total inactivation ratio equal to or greater than one (1.0) is assumed to provide a 3-log inactivation of Giardia lamblia cysts.
Disinfectant contact time in pipelines must be calculated based on plug flow by dividing the internal volume of the pipe by the maximum hourly flow rate through that pipe. Disinfectant contact time within mixing basins and storage reservoirs must be determined by tracer studies or an equivalent demonstration.
Direct influence must be determined for individual sources in accordance with criteria established by the commissioner. The commissioner's determination of direct influence may be based on site-specific measurements of water quality or documentation of well construction characteristics and geology with field evaluation, or both.
The commissioner may require a system to demonstrate the level of chloramines present when measured as combined chlorine under clause (B).
Delivery can be through a direct connection or through the distribution system of one (1) or more consecutive systems.
*This document is incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, 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.
**This document is incorporated by reference. Copies may be obtained from the Government Publishing Office, www.gpo.gov, U.S. EPA National Service Center for Environmental Publications (www.epa.gov/nscep), or are available for review at the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, Indiana 46204.
327 IAC 8-2-1