310 CMR, § 22.07C - Unregulated Inorganic and Organic Chemicals Special Monitoring
(1)
Monitoring for Unregulated
Organic and Inorganic Contaminants. The Monitoring frequency for
the contaminants listed in 310 CMR 22.07C(5), (7) and (8) shall be as follows.
(a)
Sampling for Synthetic
Organic Contaminants. Reserved.
(b)
Sampling for Inorganic
Contaminants. Reserved.
(c)
Sampling for Volatile Organic
Contaminants. Each community and non-transient non-community water
system shall take one sample at each sampling point for each contaminant listed
in 310 CMR 22.07C(5) and report the results to the Department. Monitoring shall
be completed at the same time as routine VOC sampling in accordance with 310
CMR 22.07B.
(2)
Sampling Locations. The sampling for the contaminants
listed in
310
CMR 22.07C shall be conducted as follows:
(a)
Ground Water Sampling
Protocols. 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). Each sample shall be taken at the same
sampling point, unless conditions make another sampling point more
representative of each source or treatment plant.
(b)
Surface Water Sampling
Protocols. Surface water systems including, but not limited to,
surface water systems with a combination of surface and ground sources shall
take a minimum of one sample at points in the distribution system that are
representative of each source or at each entry point to the distribution system
after treatment (sampling point). Each sample shall be taken at the same
sampling point, unless conditions make another sampling point more
representative of each source or treatment plant.
(c)
Multiple
Sources. If the system draws water from more than one source and
the sources are combined before distribution, the system shall sample at an
entry point to the distribution system during periods of normal operating
conditions (i.e., when water representative of all sources is
being used).
(d)
Confirmation Sampling. The Department may require a
confirmation sample for positive or negative results.
(e)
Composite
Sampling. The Department may reduce the total number of samples a
system shall analyze by allowing the use of compositing. Composite samples from
a maximum of five sampling points are allowed, provided that the detection
limit of the method used for analysis is less than 1/5 of the MCL. Compositing
of samples shall be done in the laboratory and the composite sample shall be
analyzed within 14 days of collection and comply with
310
CMR 22.07B(6)(a) through
(e). If the population served by the system
is >3,300 persons, then compositing may only be permitted by the Department
at sampling points within a single system. In systems serving <=3,300
persons, the Department may permit compositing among different systems provided
the five-sample limit is maintained.
(3)
Unregulated Inorganic and
Organic Chemical Special Monitoring. (Reserved)
(4)
Sampling
Waivers. Each community and non-transient non-community water
system may apply to the Department for a waiver from the requirements of
310
CMR 22.07C(l)(a), (b) and
(c).
Basis of Sampling Waivers. The Department may grant a waiver for the monitoring requirement of 310 CMR 22.07C(5) based on the criteria specified in 310 CMR 22.07B(3)(a). Waivers for monitoring requirements of 310 CMR 22.07C(7) are based on the criteria specified in 310 CMR 22.07 A(4). The Department may grant a waiver from the requirement of 310 CMR 22.07C(8) if previous analytical results indicate contamination would not occur, provided this data was collected after January 1, 1990.
(5)
Unregulated VOC
Contaminants. Methyl tert-butyl ether (MTBE)
(6)
EPA Analytical Methods for
Unregulated VOC Contaminants. Analysis for the contaminants listed
in
310
CMR 22.07C(5) shall be
conducted using the recommended EPA methods at
310
CMR 22.07B(8).
(7)
Unregulated Synthetic Organic
Contaminants and Analytical Methods. 1,4-Dioxane: EPA Method 522:
Determination of 1,4-Dioxane in Drinking Water by Solid Phase
Extraction (SPE) and Gas Chromatography/Mass Spectrometry (GC/MS) with Selected
Ion Monitoring (SIM), EPA/600/R-08/101, Version 1.0, September
2008.
(8)
Unregulated
Inorganic Contaminants and Analytical Methods. Reserved.
(9)
Repeat
Monitoring. All community and non-transient, non-community water
systems shall repeat the monitoring for contaminants listed in
310
CMR 22.07C(5) no less
frequently than every three years or in accordance with the sampling
frequencies in 310 CMR 22.07(B).
(10)
Unregulated Inorganic and
Organic Chemical Special Monitoring. (Reserved)
Notes
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