Section 18 AAC 72.615 - Alternative wastewater systems requiring plan approval(a) Plans for construction of an alternative wastewater system must include the items required under 18 AAC 72.205 and 18 AAC 72.245.(b) For alternative wastewater systems proposing an advanced treatment unit or package plant, the submittal must include (1) documentation that the unit and associated components have a current certification from an accredited third-party testing organization; or(2) a monitoring and sampling plan to demonstrate that the treatment unit can successfully treat wastewater for at least one year after installation.(c) For alternative wastewater systems proposing an alternative soil absorption system, the submittal must include (1) site plans showing the location of (A) all existing or proposed development;(B) the area reserved for the replacement soil absorption system;(D) for the area within 200 feet of the system, all private or public water systems and surface water;(2) a soils analysis and report prepared in accordance with 18 AAC 72.265 that demonstrates that the soil types, percolation rates, and depths to seasonal high water table and impermeable strata are suitable for the type of soil absorption system selected;(3) calculations demonstrating that the size of the infiltrative surface area conforms to standard sanitary engineering principles and practices;(4) pressurized distribution piping design and calculations with pump curves and specifications;(5) provisions for the adequate depth of burial, mounding above grade, or insulation to protect against frost penetration, with insulation equivalent to the standard listed for the applicable geographical area described in 18 AAC 72.630(c); and(6) for a system, or cumulative systems, with a subsurface discharge design fiow greater than 2,500 gallons per day, calculations determining nitrate concentrations in the groundwater aquifer at the nearest down-gradient property line of the system site, or to a point that the department identifies as necessary to protect public health, public and private water systems, and the environment; if nitrate concentrations are likely to exceed five milligrams per liter, the department may require additional treatment and groundwater monitoring.(d) For alternative wastewater systems proposing the use of a holding tank, other than marine sanitation devices or tanks wholly contained within a mobile food unit or occupied building, plans must include (1) information justifying a holding tank as the most practicable and feasible wastewater system for the facility operations and site conditions;(2) calculations for the size of the tank and the design flow for the facility providing a minimum of two days' storage capacity, or greater if the department identifies it as necessary;(3) specifications for the tank to be equipped with a visual beacon and audio high water alarm that will alert the users when pumping is required; the specifications must include (A) the design drawings showing the levels when the alarm will activate and the location of the beacon; and(B) the manufacturer's cut sheet for the alarm;(4) provisions for resisting buoyancy forces when the tank is pumped; and(5) information on the accessibility of the tank for pumping, the availability of a pumper and hauler, and the location of the final disposal.(e) For alternative wastewater systems proposing the use of a surface water outfall, the submittal must include items as required under 18 AAC 72.275.(f) To obtain an approval to operate an alternative wastewater system, the applicant shall submit to the department (1) items required under 18 AAC 72.240; and(2) a signed statement from the owner or operator of the system on a form provided by the department confirming the owner or operator has received a copy of an operations and maintenance manual developed in accordance with manufacturer recommendations and the system will be operated and maintained in accordance with the manual.(g) The department may require periodic testing, monitoring, and reports that demonstrate the alternative wastewater system meets the expected performance criteria.Eff. 10/1/2023, Register 247, October 2023Authority:AS 44.46.020
AS 46.03.010
AS 46.03.020
AS 46.03.050
AS 46.03.100
AS 46.03.110