Alaska Administrative Code › Title 18 - Environmental Conservation › Chapter 80 - Drinking Water › Article 3 - Standards, Monitoring, Variances, and Exemptions › 18 AAC 80.315 - Inorganic chemical sampling requirements

Current through May 31, 2024
(a) For the
				purposes of this section, a GWUDISW source is considered a surface water
				source.
(b) in addition to the
				requirements of 40 C.F.R.
				141.23(a) - (h), adopted by
				reference in
				18 AAC 80.010(a),
				the following requirements apply:
(1) for
				40 C.F.R.
				141.23(a)(4)(iii), the
				results reported to the department within 14 days after completing the analysis
				of the composite sample are subject to the report certification requirements of
				18 AAC 80.1900;
(2) in addition to the requirements of
				40 C.F.R.
				141.23(b), asbestos
				monitoring requirements include the following:
(A) the owner may apply to the department for
				a waiver of the asbestos monitoring requirement in
				40 C.F.R.
				141.23(b)(2) using a form
				provided by the department;
(B) the
				department will grant an asbestos-monitoring waiver, if the department
				determines that a waiver serves the interest of public health and that the
				potential for asbestos contamination of the public water system is low, based
				on the criteria set out in 40 C.F.R.
				141.23(b)(3);
(3) for
				40 C.F.R.
				141.23(c)(8), in order to
				qualify for a decrease in the quarterly monitoring requirement, the owner of a
				combination-source system must ensure the taking of at least four quarterly
				samples from each surface water source and two quarterly samples from each
				groundwater source that exceeded an inorganic chemical MCL listed in
				40 C.F.R.
				141.62(b), adopted by
				reference in
				18 AAC 80.010(a);
(4) for
				40 C.F.R.
				141.23(d), if monitoring
				data are generally consistent with the monitoring requirements to determine
				compliance with the MCL for nitrate listed in
				40 C.F.R.
				141.62(b), adopted by
				reference in
				18 AAC 80.010(a),
				the department will allow the owner of a public water system to use that data
				to comply with the monitoring requirement for the initial compliance
				period;
(5) in addition to the
				monitoring requirements for the MCL for nitrite in
				40 C.F.R.
				141.23(e), the following
				requirements also apply:
(A) for
				40 C.F.R.
				141.23(e)(2), the monitoring
				frequency for the MCL of nitrite after the initial monitoring under
				141.23(e)(1) is as follows:
(i) for a system
				with an analytical result for nitrite less than 50 percent of the MCL listed in
				40 C.F.R.
				141.62(b), adopted by
				reference in
				18 AAC 80.010(a),
				additional monitoring is not required;
(ii) if the water system has a reported
				nitrite result that is more than 50 percent of the MCL listed in
				40 C.F.R.
				141.62(b), adopted by
				reference in
				18 AAC 80.010(a),
				the owner shall ensure that, within 31 days after notification of the nitrite
				result, a repeat nitrite sample is taken at each sampling point where a nitrite
				result was more than 50 percent of the MCL;
(B) if monitoring data are generally
				consistent with the requirements of
				40 C.F.R.
				141.23(e), the department
				will allow the owner to use that data to comply with the monitoring requirement
				for the initial compliance period;
(6) the owner of a public water system that
				adds fluoride shall ensure that monitoring and sampling for fluoride occurs at
				the entry point of the distribution system each day that water is served to the
				public, except that if the public water system is a fill-and-draw system, the
				owner shall ensure that monitoring and sampling occur each day that fluoride is
				added to the water when making water; the owner shall ensure the reporting of
				the results of sampling done under this paragraph monthly to the
				department;
(7) with respect to the
				requirements for taking confirmation samples as set out in
				40 C.F.R.
				141.23(f), the department
				will delete results of obvious sampling errors;
(8) for
				40 C.F.R.
				141.23(g), the department
				will, if it determines that increased monitoring serves the interests of public
				health, require more frequent monitoring than that specified in
				40 C.F.R.
				141.23(b) - (e), and in (2)
				- (6) of this subsection, or require confirmation samples for positive or
				negative results.