Code of Massachusetts Regulations › 310 CMR - DEPARTMENT OF ENVIRONMENTAL PROTECTION › Title 310 CMR 22.00 - Drinking Water › Section 22.07F - Definitions

Current through Register 1525, July 5, 2024
(1)
Initial Distribution System
			 Evaluations
.
(a)
General Requirements
. The requirements of 310 CMR
			 22.07F(1) through (6) establish monitoring and other requirements for
			 identifying Stage 2 DBPR compliance monitoring locations under 310 CMR 22.07(F)
			 for determining compliance with Maximum Contaminant Levels for Total
			 Trihalomethanes (TTHM) and Haloacetic Acids (Five) (HAA5). The Supplier of
			 Water must use an Initial Distribution System Evaluation (IDSE) to determine
			 locations with representative high TTHM and HAA5 concentrations throughout
			 their Distribution System. IDSEs are used in conjunction with, but separate
			 from, compliance monitoring required by 310 CMR 22.07E, to identify and select
			 compliance monitoring locations under 310 CMR 22.07F(6).
(b)
Applicability
.
			 For Community Water Systems that use a primary or residual Disinfectant other
			 than ultraviolet light or deliver water that has been treated with a primary or
			 residual Disinfectant other than ultraviolet light; or a Non-transient
			 Non-community Water System that serves at least 10,000 people and uses a
			 primary or residual Disinfectant other than ultraviolet light or delivers water
			 that has been treated with a primary or residual Disinfectant other than
			 ultraviolet light.
(c)
Schedule
.
1. Each
			 Supplier of Water must comply with the requirements of the schedule in the
			 table in 310 CMR 22.20F(1)(c).
TABLE 1 - 310 CMR 22.07F
INITIAL DISTRIBUTION SYSTEM EVALUATION SCHEDULE
If you serve this population
Supplier of water must submit their standard
							 monitoring plan or system specific study plan1 or
							 40/30 certification2 to the Department by or receive
							 very small system waiver from the Department
Supplier of water must complete their standard
							 monitoring or system specific study by
Supplier of water must submit their IDSE report to
							 the Department by3
Systems that are not part of a Combined Distribution
							 System and systems that serve the largest population in the Combined
							 Distribution System
a. $100,000
October 1, 2006
September 30, 2008
January 1, 2009
b. 50,000-99,999
April 1, 2007
March 31, 2009
July 1, 2009
c. 10,000-49,999
October 1, 2007
September 30, 2009
January 1, 2010
d. < 10,000 (CWS Only)
April 1, 2008
March 31, 2010
July 1, 2010
Other systems that are part of a Combined
							 Distribution System
e. Wholesale System or consecutive system
--at the same time as the system with the earliest
							 compliance date in the Combined Distribution System
--at the same time as the system with the earliest
							 compliance date in the Combined Distribution System
--at the same time as the system with the earliest
							 compliance date in the Combined Distribution System
1 If, within 12 months after the
				date identified in this column, the Department does not approve the Supplier of
				Water's plan or notify them that it has not yet completed its review, the
				Supplier of Water may consider the plan that was submitted as approved.
2 The Supplier of Water must
				implement that plan and they must complete standard monitoring or a system
				specific study no later than the date identified in the third column. The
				supplier of water must submit their 40/30 certification under 310 CMR 22.20F(4)
				by the date indicated.
3 If, within three months after the
				date identified in this column (nine months after the date identified in this
				column if the Supplier of Water must comply on the schedule in 310 CMR
				22.07F(1)(c)1.c., the Department does not approve their IDSE report or notify
				them that it has not yet completed its review, the Supplier of Water may
				consider the report that was submitted as approved and must implement the
				recommended monitoring in 310 CMR 22.07F as required.
2. For the purpose of the schedule in 310 CMR
			 22.07F(1)(c)1., the Department may determine that the Combined Distribution
			 System does not include certain consecutive systems based on factors such as
			 receiving water from a Wholesale System only on an Emergency basis or receiving
			 only a small percentage and small volume of water from a Wholesale System. The
			 Department may also determine that the Combined Distribution System does not
			 include certain Wholesale Systems based on factors such as delivering water to
			 a consecutive system only on an Emergency basis or delivering only a small
			 percentage and small volume of water to a consecutive system.
(d) The Supplier of Water must
			 conduct standard monitoring that meets the requirements in 310 CMR 22.20F(2),
			 or a system specific study that meets the requirements in 310 CMR 22.07F(3), or
			 certify to the Department that they meet 40/30 certification criteria under 310
			 CMR 22.20F(4), or qualify for a very small system waiver under 310 CMR
			 22.07F(5).
1. The Supplier of Water must have
			 taken the full complement of routine TTHM and HAA5 compliance samples required
			 of a system with their population and source water under 310 CMR 22.07E (or
			 they must have taken the full complement of reduced TTHM and HAA5 compliance
			 samples required of a system with their population and source water under 310
			 CMR 22.07E if they meet reduced monitoring criteria under 310 CMR 22.07E)
			 during the period specified in 310 CMR 22.07F(4)(a) to meet the 40/30
			 certification criteria in 310 CMR 22.07F(4). The Supplier of Water must have
			 taken TTHM and HAA5 samples under 310 CMR 22.07E(6) and (7) to be eligible for
			 the very small system waiver in 310 CMR 22.07F(5).
2. If the Supplier of Water has not taken the
			 required samples, they must conduct standard monitoring that meets the
			 requirements in 310 CMR 22.07F(2), or a system specific study that meets the
			 requirements in 310 CMR 22.07F(3).
(e) The Supplier of Water must use only the
			 analytical methods specified in 310 CMR 22.07E(6), or otherwise approved by EPA
			 for monitoring under 310 CMR 22.07F, to demonstrate compliance with the
			 requirements of 310 CMR 22.07F.
(f)
			 IDSE results will not be used for the purpose of determining compliance with
			 MCLs in 310 CMR 22.07E(1).