(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.
(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
|
Methodology4
|
EPA1
|
SM2
|
|
Sodium
|
Inductively-coupled Plasma Atomic absorption;
|
200.7
|
--
|
|
direct aspiration
|
--
|
3111B
|
1
Methods for the
Determination of Metals in Environmental Samples - Supplement I",
EPA-600/r-94/111, May 1994. Available at NTIS, PB-95-125472.
2
Standard Methods for the
Examination of Water and Wastewater", 18th
and 19th edition, American Public Health
Association, 1992 and 1995, only - not the 20th
edition.
3 For approved analytical procedures
for metals, the technique applicable to total metals must be used.
4 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.
