HAR §11-20-12. Organic chemicals other than total trihalomethanes, sampling and analytical requirements

(a) (Reserved) (b) (Reserved) (c) (Reserved) (d) (Reserved) (e) Analysis for the contaminants in section 11-20-4(d) and (e) shall be conducted using the EPA methods cited in 40 C.F.R. §141.24(e), or alternative methods listed in Appendix A to Title 40 Code of Federal Regulations, Part 141, Subpart C, or their equivalent as approved by EPA. Analysis for 1,2,3-trichloropropane shall be conducted using the EPA methods cited in the EPA Technical Fact Sheet - 1,2,3-Trichloropropane (TCP), dated January 2014 also available at https://www.epa.gov/sites/production/files/2014-03/documents/ffrrofactsheet_contaminant_tcp_january2014_final.pdf, or their equivalent as determined by EPA. 20-71 5376 §11-20-12 (f) Beginning with the initial compliance period, analysis of the contaminants listed in section 11-20-4(d) for the purpose of determining compliance with the MCL shall be conducted as follows: (1) Ground water systems shall take a minimum of one sample at every entry point to the distribution system which is representative of each well after treatment (hereafter called a sampling point). Each sample must be taken at the same sampling point unless conditions make another sampling point more representative of each source, treatment plant, or within the distribution system. (2) Surface water systems (or combined surface and ground) 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 (hereafter "sampling point"). Each sample must be taken at the same sampling point unless conditions make another sampling point more representative of each source, treatment plant, or within the distribution system. (3) If the system draws water from more than one source and the sources are combined before distribution, the system must 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). (4) Each community and non-transient non-community water system shall take four consecutive quarterly samples for each contaminant listed in section 11-20-4(d), with the exception of vinyl chloride, during each compliance period beginning in the initial compliance period. (5) If the initial monitoring for benzene, carbon tetrachloride, para-dichlorobenzene, 1,2-dichloroethane, 1,1-dichloroethylene, 1,1,1-trichloroethane, trichloroethylene, 20-72 3376 §11-20-12 and vinyl chloride and the monitoring for all of the other contaminants listed in section 11-20-4(d) as allowed in paragraph (18) has been completed by December 31, 1992 and the system did not detect any contaminant listed in section 11-20-4(d) then each ground and surface water system shall take one sample annually beginning with the initial compliance period. (6) After a minimum of three years of annual sampling, the director may allow ground water systems which have no previous detection of any contaminant listed in section 11-20-4(d) to take one sample during each compliance period. (7) Each community and non-transient non-community ground water system which does not detect a contaminant listed in section 11-20-4(d) may apply to the director for a waiver from the requirements of paragraphs (5) and (6) after completing the initial monitoring. (For the purposes of this section, detection is defined as greater than or equal to 0.0005 mg/l.) A waiver shall be effective for no more than six years (two compliance periods). States may also issue waivers to small systems for the initial round of monitoring for 1,2,4-trichlorobenzene. (8) The director may grant a waiver after evaluating the following factor(s): (A) Knowledge of previous use (including transport, storage, or disposal) of the contaminant within the watershed or zone of influence of the system. If a determination by the director reveals no previous use of the contaminant within the watershed or zone of influence, a waiver may be granted. (B) If previous use of the contaminant is unknown or it has been used previously, then the following factors shall be 20-73 3376 1