Special Monitoring for Sodium, Reporting and Analytical Methods and Frequency

(1) Monitoring. All public water systems (community, non-transient non-community and transient non-community) shall monitor for the determination of sodium concentration levels. (2) Initial Sampling Frequency. Each community, non-transient, non-community and transient non-community water system is required to monitor for sodium during the first three-year compliance period of each nine-year compliance cycle beginning in the compliance period starting January 1, 1993. (a) GW Sampling Frequency. Groundwater systems shall take one sample at each sampling point during each compliance period beginning in the compliance period starting January 1, 1993, (once every three years). (b) SW Sampling Frequency. Surface water systems (or combined surface/ground) shall take one sample annually at each sampling point beginning January 1, 1993. (3) Sampling Protocol. Monitoring shall be conducted as follows: (a) Ground Water Sampling Points. Groundwater systems shall take a minimum of one sample at every entry point to the distribution system which is representative of each well after treatment (sampling point) beginning in the compliance period starting January 1, 1993. The system shall take each sample at the same sampling point unless conditions make another sampling point more representative of each source or treatment plant. (b) Surface Water Sampling Points. Surface water systems (Note: For purposes of 310 CMR 22.06A(3)(b), surface water systems include systems with a combination of surface and ground sources.) shall take a minimum of one sample at every entry point to the distribution system after any application of treatment or in the distribution system at a point which is representative of each source after treatment (sampling point) beginning in the compliance period beginning January 1, 1993. The system shall take each sample at the same sampling point unless conditions make another sampling point more representative of each source or treatment plant. 22.06A: continued (c) Multiple Sources. If a system draws water from more than one source and the sources are combined before distribution, the system must sample at an entry point to the distribution system during periods of normal operating conditions (i.e., when water is representative of all sources being used). (4) Sodium Reporting. The supplier of water shall report to the Department the results of the analyses for sodium within the first ten days of the month following the month in which the sample results were received or within the first ten days following the end of the required monitoring period, whichever comes first. (5) Sodium Notification. The supplier of water shall report the level of sodium for each source to the local Boards of Health and Massachusetts Department of Public Health by written notice by direct mail within 30 days after the supplier of water first learns of the analytic results which indicate a level of sodium. (6) Sampling Schedules. Each public water system shall monitor at the time designated by the Department during each compliance period. (7) Sodium Analysis Analytical Methods. Analysis for sodium shall be conducted using the following method: SODIUM ANALYTICAL METHODS Reference (Method Number) Contaminant Methodology EPA SM Sodium Inductively-coupled Plasma -- Atomic absorption; direct aspiration -- 3111B Methods for the Determination of Metals in Environmental Samples - Supplement I", EPA-600/r-94/111, May 1994. Available at NTIS, PB-95-125472. Standard Methods for the Examination of Water and Wastewater", 18 and 19 edition, American Public th th Health Association, 1992 and 1995, only - not the 20 edition. th For approved analytical procedures for metals, the technique applicable to total metals must be used. Standard Methods Online are available at http://www.standardmethods.org. The year in which each method was approved by the Standard Methods Committee is designated by the last two digits in the method number. The methods listed are the only online versions that may be used.