Section 18 AAC 72.275 - Disposal systems(a) Plans for construction of a surface water outfall must include (1) the items required to be submitted under 18 AAC 72.205;(2) information describing how the provisions of 18 AAC 72.050 will be met;(3) design calculations, design criteria, and specifications for (A) design flows, waste loads, and expected effluent quality;(B) pipe size and material;(C) siting with respect to health hazards, nuisance potential, and flooding;(D) methods to control operational variables;(E) bedding and backfill;(F) anchoring systems; and(G) thermal protection considerations;(4) specifications for the materials, methods, and techniques used to install and secure the outfall line that will prevent structural damage to, or movement of, the outfall as a result of wave action within the surf zone, storms, beach logs, ice, settling, or current;(5) if a mixing zone is requested, mixing and dilution calculations showing that the outfall line's length, grade, orifice size and number, depth, and distance out from lowest water level provide for effluent dispersion and dilution sufficient to meet any discharge permit requirements, standard sanitary engineering principles and practices, or to otherwise comply with AS 46.03 and this chapter;(6) for a gravity sewer extending into the receiving waters, a manhole or clean-out at the shore end to allow access for maintenance;(7) a provision to sample the effluent before the effluent mixes with the receiving waters; and(8) the location of any nearby aquatic farms or commercial or subsistence shellfish, harvest areas and information demonstrating the discharge is not a threat to these activities.(b) Plans for the construction of a land surface disposal system must include (1) the items required to be submitted under 18 AAC 72.205;(2) information describing how the provisions of 18 AAC 72.050 will be met;(3) design calculations, design criteria, and specifications for(A) design flows and wastewater loading rates;(B) treatment capacities and expected effluent quality;(C) siting with respect to potential for health hazards, nuisances, and flooding;(D) assimilative capacity of the soil and associated flora, and the ultimate impact on groundwater or surface water;(E) material and equipment selection and specifications;(F) methods to control operational variables; and(G) thermal protection considerations;(4) documentation that the owner of the facility discharging wastewater onto the land (A) owns the land treatment area; or(B) has written authorization from the landowner to discharge wastewater onto the land;(5) provision to protect the land treatment area from public access;(6) documentation demonstrating that the topography, hydrology, geology, and soil characteristics of the land treatment area are adequate to protect existing and potential water and land uses outside of the land treatment area, including subsistence, housing, education, industry, recreation, and agriculture; and(7) an explanation of how the method of discharge prevents transmission of disease.(c) The department will consider other means of final disposal on a case-by-case basis to determine whether they are protective of public health, public and private water systems, and the environment.Eff. 4/1/99, Register 149; am 7/29/2006, Register 179; am 10/1/2023, Register 247, October 2023Requirements for disposal systems proposing a conventional soil absorption system are addressed under 18 AAC 72.501-18 AAC 72.560 or an alternate soil absorption system are addressed under 18 AAC 72.601-18 AAC 72.660.
Authority:AS 44.46.020
AS 46.03.010
AS 46.03.020
AS 46.03.050
AS 46.03.100
AS 46.03.110