Section 18 AAC 80.315 - Inorganic chemical sampling requirements(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.Eff. 10/1/99, Register 151; am 5/2/2004, Register 170; am 1/11/2006, Register 177; am 8/19/2006, Register 179; am 11/9/2006, Register 180; am 4/24/2009, Register 190Authority:AS 46.03.020
AS 46.03.050
AS 46.03.070
AS 46.03.710
AS 46.03.720