18 AAC 80.345. Special monitoring requirements

(a) Except as provided in (j) of this section, the owner or operator of a Class A public water system serving 10,000 or more individuals shall monitor for the contaminants listed in this subsection, as required by this subsection. The owner or operator shall ensure that samples taken under this section are analyzed by a certified laboratory, using the analytical methods set out in 40 C.F.R. 141.40, adopted by reference in 18 AAC 80.010(a) for these contaminants. For purposes of this section, a GWUSIDW source is considered a surface water source. Contaminants subject to this section are as follows:

(1) 1,1-dichloroethane;

(2) 1,1-dichloropropene;

(3) 1,1,1,2-tetrachloroethane;

(4) 1,1,2,2-tetrachloroethane;

(5) 1,2,3-trichloropropane;

(6) 1,3-dichloropropane;

(7) 1,3-dichloropropene;

(8) 2,2-dichloropropane;

(9) bromobenzene;

(10) bromodichloromethane;

(11) bromoform;

(12) bromomethane;

(13) chlorodibromomethane;

(14) chloroethane;

(15) chloroform;

(16) chloromethane;

(17) dibromomethane;

(18) m-dichlorobenzene;

(19) o-chlorotoluene;

(20) p-chlorotoluene.

(b) In addition to the monitoring requirements of (a) of this section, and as the department determines necessary to serve the interests of public health, the department will require the owner or operator to monitor for the following contaminants, using the analytical methods set out in 40 C.F.R. 141.40, adopted by reference in 18 AAC 80.010(a) :

(1) 1,2,3-trichlorobenzene;

(2) 1,2,4-trichlorobenzene;

(3) 1,2,4-trimethylbenzene;

(4) 1,3,5-trimethylbenzene;

(5) bromochloromethane;

(6) dichlorodifluoromethane;

(7) fluorotrichloromethane;

(8) hexachlorobutadiene;

(9) isopropylbenzene;

(10) n-butylbenzene;

(11) n-propylbenzene;

(12) naphthalene;

(13) p-isopropyltoluene;

(14) sec-butylbenzene;

(15) tert-butylbenzene.

(c) The owner or operator of a groundwater system shall take samples at each entry point to the distribution system that is representative of each groundwater source or water treatment works. Each of these points is a sampling point. Samples must be collected after treatment. The minimum number of samples is one sample for each water source. The owner or operator shall take each subsequent sample at the same sampling point unless conditions make another sampling point more representative of each groundwater source or water treatment works.

(d) The owner or operator of a surface water system shall take samples at each entry point to the distribution system or at points in the distribution system that are representative of each surface water source or water treatment works. Each of these points is a sampling point. Samples must be collected after treatment. The minimum number of samples is four consecutive quarterly samples for each water source or water treatment works. The owner or operator shall take each subsequent sample at the same sampling point unless conditions make another sampling point more representative of each surface source or water treatment works.

(e) The owner or operator of a combination-source system shall monitor each source as specified in (c) and (d) of this section.

(f) The owner or operator may use monitoring data collected after January 1, 1983 to meet the requirements of this section, if the system's monitoring program was consistent with the requirements of this section.

(g) The owner or operator shall monitor for the contaminants listed in (1) of this subsection, as required by (2) - (8) of this subsection, as follows:

(1) the owner or operator of a Class A public water system shall monitor for the following contaminants, using the analytical methods specified for each contaminant in Table C of this paragraph;

TABLE C. ANALYTICAL METHODS

Organic Contaminants EPA Analytical Method * Aldicarb 531.1, 6610 Aldicarb Sulfone 531.1, 6610 Aldicarb Sulfoxide 531.1, 6610 Aldrin 505, 508, 508.1, 525.2 Butachlor 507, 525.2 Carbaryl 531.1, 6610 Dicamba 515.1, 515.2, 555 Dieldrin 505, 508, 508.1, 525.2 Methomyl 531.1, 6610 Metolachlor 507, 508.1, 525.2 Metribuzin 507, 508.1, 525.2 Propachlor 507, 508.1, 525.2 3-Hydroxycarbofuran 531.1, 6610

Inorganic Contaminant EPA Analytical Method Sulfate Colorimetric

* The analytical methods listed in Table C are required under 40 C.F.R. 141.40(n)(11)-(12), adopted by reference at 18 AAC 80.010(a) .

(2) the owner or operator shall

(A) take four consecutive quarterly samples at each sampling point for each organic contaminant listed in Table C in (1) of this subsection;

(B) take one sample per calendar year at each sampling point for each inorganic contaminant listed in Table C in (1) of this subsection; and

(C) report the results of the analysis of samples taken under (A) and (B) of this paragraph to the department, subject to the report certification requirements of 18 AAC 80.1900;

(3) the owner or operator may apply to the department for a waiver from the requirements of (2) of this subsection, using the procedures described in the department's Synthetic Organic Chemicals (SOCs) and Other Organic Chemicals (OOCs) Monitoring Waiver Application , adopted by reference in 18 AAC 80.010(b) ;

(4) the department will grant a waiver from the requirement in (2) of this subsection to monitor for

(A) organic contaminants listed in Table C in (1) of this subsection, based on the factors in 18 AAC 80.320(6) ; and

(B) inorganic contaminants listed in Table C in (1) of this subsection, if previous analytical results collected after January 1, 1990 indicate that contamination is not expected to occur;

(5) the owner or operator of a groundwater system shall take a minimum of one sample at each sampling point described in (c) of this section;

(6) the owner or operator of a surface water system shall take a minimum of one sample at each sampling point described in (d) of this section;

(7) the owner or operator of a combination-source system shall monitor each groundwater source as described in (5) of this subsection, and each surface water source as described in (6) of this subsection;

(8) if the system draws water from more than one source and the sources are combined before distribution, the owner or operator shall sample after treatment at an entry point to the distribution system when the water is representative of all sources being used;

(9) the department will reduce the total number of samples that must be analyzed by allowing compositing; composite samples must be analyzed within 14 days after collection; if the system serves more than 3,300 individuals, the department will allow compositing only at sampling points within a single system; for a system serving 3,300 or fewer individuals, the department will allow compositing among different systems.

(h) The owner or operator shall repeat the monitoring required in this section at least once every five years.

(i) The department will require confirmation samples for positive or negative results if it determines that confirmation samples serve the interests of public health.

(j) If a public water system was in operation before January 1, 1994, if the system served less than 150 service connections at all times before that date, and if the owner or operator sent a letter to the department on or before that date, stating that the system was available for sampling, the owner or operator is exempt from the monitoring requirements of this section. The owner or operator may not send the samples required by this section unless the department requests the owner or operator to do so.

History: Eff. 10/1/99, Register 151; am 3/25/2001, Register 157; am 1/11/2006, Register 177

Authority: AS 46.03.020

Editor's note: Information about how to review or obtain the analytical methods referred to in this section is in the editor's note to 18 AAC 80.010.

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