Section 327IAC8-2-21. Special monitoring for sodium

   (a) Suppliers of water for community public water systems shall collect and analyze one (1) sample per treatment plant at the entry point of the distribution system for the determination of sodium concentration levels. Samples must be collected and analyzed annually for systems utilizing surface water sources in whole or in part, and at least every three (3) years for systems utilizing solely ground water sources. The minimum number of samples required to be taken by the system shall be based on the number of treatment plants used by the system, except that multiple wells drawing raw water from a single aquifer may, with the commissioner’s approval, be considered one (1) treatment plant for determining the minimum number of samples. The supplier of water may be required by the commissioner to collect and analyze water samples for sodium more frequently in locations where the sodium content is variable.

  (b) The supplier of water shall report to the commissioner the results of the analyses for sodium within the first ten (10) days of the month following the month in which the sample results were received or within the first ten (10) days following the end of the required monitoring period as stipulated by the commissioner, whichever of these is first. If more than annual sampling is required, the supplier shall report the average sodium concentration within ten (10) days of the month following the month in which the analytical result of the last sample used for the annual average was received. Systems shall submit information to the commissioner using the methods specified in section 13(e) of this rule.

  (c) The supplier of water shall notify the commissioner and appropriate local public health officials of the sodium levels by written notice by direct mail within three (3) months. A copy of each notice required to be provided by this subsection shall be sent to the commissioner within ten (10) days of its issuance. The supplier of water is not required to notify the commissioner and appropriate local public health officials of the sodium levels where the commissioner provides such notices in lieu of the supplier.

  (d) Analyses for sodium shall be performed by the following methods:

(1) Inductively coupled plasma, Method 200.7*.

(2) Atomic absorption; direct aspiration, Method 3111B*.

  *Methods referenced in this section may be obtained as follows:

(1) Method 200.7 may be found in "Methods for the Determination of Metals in Environmental Samples-Supplement 1", EPA-600/R-94-111, May 1994, available from NTIS, PB95-125472, U.S. Department of Commerce, 5285 Port Royal Road, Springfield, Virginia 22161.

(2) Method 3111B may be found in "Standard Methods for the Examination of Water and Wastewater", 18^th Edition, 1992, or "Standard Methods for the Examination of Water and Wastewater", 19^th Edition, 1995, American Public Health Association, available from the American Public Health Association, 1015 Fifteenth Street N.W., Washington, D.C. 20005. Either edition may be used.

These methods are available for copying at the Indiana Department of Environmental Management, Office of Water Quality, 100 North Senate Avenue, Room N1255, Indianapolis, Indiana 46204. (Water Pollution Control Division; 327 IAC 8-2-21; filed Dec 28, 1990, 5:10 p.m.: 14 IR 1039; filed Aug 25, 1997, 8:00 a.m.: 21 IR 68; errata filed Dec 10, 1997, 3:45 p.m.: 21 IR 1348; filed Jul 23, 2001, 1:02 p.m.: 24 IR 3977; errata filed Feb 6, 2006, 11:15 a.m.: 29 IR 1937)