§11-23-09 - Siting and pre-conatruction requirements.

§11-23-09 Siting and pre-conatruction requirements.

(a) Any new injection well, other than subclass 0 injection wells, shall be sited beyond an area which extends at least one-quarter mile from any part of a drinking water source. This includes not only the surface expression of the water supply well, tunnel or spring, but also all portions of the subsurface collection system which may extend laterally, either at right or inclined angles to the ground surface. The area of protection shall be delineated by a reasonably smooth curve drawn to connect the points extending one-quarter mile beyond the most extensive portions of the drinking water source and its collection system.

(b) Where the surface expression of an existing drinking water source drawing from an artesian aquifer is located in an exempted caprock aquifer, a new injection well, other than a subclass D injection well, shall be located, in addition to subsection (a) of this section, outside an area measuring one-half mile wide, which is bisected by a line running hydrologically upgradient from the surface expression of the drinking water source to the UIC boundary line. This condition also applies to any future drinking water source which may be sited in an exempted aquifer.

(c) For a proposed injection well which is sited mauka of the UIC boundary line, in addition to meeting the minimum distance requirement in subsection (a) of this section, the department shall require the applicant to submit water quality data representative of local conditions as part of the application. Where water quality data is lacking or insufficient to determine the areal water quality, the department may require the applicant to collect representative water samples from the injection well during construction. The samples shall be collected and analyzed, in accordance with standards and methods established in chapter 11-20, entitled "Rules Relating To Potable Water Systems". The parameters for which values shall be identified are, at least, the following:

(1) Chloride concentration,

(2) Total dissolved solids (TDS), and

(3) Coliform - Total; if found, then fecal and streptococcus determinations.

(d) The variety of injection wells and their uses dictate a variety of construction designs consistent with those uses, and precludes specific construction standards for each type of injection well outlined in this chapter. However, an injection well shall be designed for its intended use, in accordance with good engineering practices as recommended by the Honolulu Board of Water Supply's "Water System Standards", dated March, 1977.

(e) Vertical migration resulting in undesirable mixing of fluids from aquifers of substantially different water quality (due to improper well construction or use of an injection well) shall be prevented by preserving the integrity of the confining zone or zones by grouting or some other method acceptable to the department.

(f) If a large void, such as a lava tube or solution cavity, is encountered during drilling, where the drill rod drops more than three feet, measures shall be taken to prevent unacceptable migration of the injected fluids. The owner shall either verify that the void does not slope inland or construct the well in such a manner that wastes are not injected directly into the void. For the first option, a test boring which verifies the void's inclination inland of the wellsite shall be drilled. For the second option, the section of the well casing which passes through the void shall be without openings. Either the perforated casing shall be replaced with solid casing, or the holes in the casing shall be sealed by grouting or in some other manner approved by the department. The owner shall notify the department to arrange discussion and approval of any corrective actions. Scheduling of the procedures shall be arranged so that the departmental staff may observe the remedial operations. The final responsibility for remedial design, implementation and performance shall rest with the consulting engineer.

(g) Departmental staff shall have the right to enter property during normal working hours, without advance notification, for the purpose of observing injection well construction methods and progress. 

         [Eff. .7/6/84; . am and comp NOV 12 1992 ] (Auth: HRS S340E-2) (Imp: HRS SS340E-2 and 340E-9, 40 CFR §§144.12, 144.51 and 146.6)

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