Title 252. Department of Environmental Quality

Chapter 641. Individual and Small Public On-Site Sewage Treatment Systems

Subchapter 13. Aerobic Systems

Section

252:641-13-1. General Provisions

252:641-13-2. Applications [Revoked]

252:641-13-3. Acceptable application surfaces [Revoked]

252:641-13-4. Suface Application

252:641-13-1. General provisions

     (a) Fluctuating flows. If the daily flow fluctuates so that the flow on any given day during the week exceeds the aerobic treatment unit’s daily capacity, then an aerobic system may not be used unless a dosing tank, which meets the requirements of 252:641-9, is installed between the trash tank and the aerobic treatment unit.

     (b) Components of aerobic systems. Aerobic systems shall be comprised of the following:

(1) Trash Tank. There shall be a trash tank that meets the requirements of ANSI/NSF or 252:641-7-2, and has a minimum capacity of three hundred (300) gallons or the daily flow, whichever is greater. The trash tank shall have an opening of sufficient size to allow for maintenance. The covering for the opening shall have a lock, locking bolt or some type of fastener, or require a tool for removal.

(2) Aerobic Treatment Unit. There shall be an aerobic treatment unit that:

     (A) has been tested and certified by an ANSI accredited third party certifier as meeting the most current ANSI/NSF Standard 40; and

     (B) is rated at or above the average daily flow.

(3) Method of Disinfection. There shall be a method to disinfect the treated sewage between the aerobic unit and the pump tank. The disinfection method must effectively reduce the fecal coliform bacteria to less than (<) 200 MPN/1000 ml. If chlorination is used as the disinfection method, a free chlorine residual of one milligram per liter (1mg/l) must be maintained.

(4) Pump Tank. There shall be a pump tank, which shall:

     (A) meet the requirements of ANSI/NSF or 252:641-7-2;

     (B) have a minimum capacity of seven hundred (700) gallons or, for systems with an average flow over three hundred fifty (350) gallons per day, have a capacity of at least twice the average daily flow;

     (C) have a sampling port in the pump tank at the discharge outlet or in the treated sewage line following the pump tank;

     (D) have a float in the pump tank set so that the pump tank is never more than one-half (1/2) full;

     (E) have a higher water alarm set to activate if the pump tank becomes more than one-half (1/2) full; and

     (F) have an opening of sufficient size to allow for maintenance. The cover for the opening shall have a lock, locking bolt or some type of fastener, or require a tool for removal.

(5) Sprinkler System. There shall be a sprinkler system to apply properly treated sewage onto the surface of the ground.

(6) Alarm. There shall be an alarm to alert the owner/operator of a system failure.

     (c) Solid Pipe. The solid pipe used to connect the components of an aerobic system must meet the specifications listed in Appendix C. Unless a lift pump is utilized, there shall be fall between:

          (1) the trash tank and the aerobic treatement unit; and

          (2) the aerobic treatment unit and the pump tank.

     (d) Other. In addition, all aerobic systems shall be installed in accordance with the manufactuers specifications and be covered by a maintenance contract for the first two years of operation.

252:641-13-2. Applications [Revoked]

252:641-13-3. Acceptable application surfaces [Revoked]

252:641-13-4. Surface application

     (a) Application Area. The application area must:

          (1) meet the size requirements of Appendix H, Figures 5 and 6; and

          (2) be vegetated and landscaped and/or terraced to prevent runoff.

     (b) Uniform Application. Sprinklers shall be designed to provide uniform distribution of treated effluent over the entire surface application area.

          (1) Spinkler design. The spray must cover the proper area without misting. Nozzles must have a thirteen-degree (13◦) or less trajectory to keep the spray stream low to the ground surface.

         (2) Timing. Surface application shall be controlled by a timing device and shall take place daily between 1:00 a.m. and 6:00 a.m.

         (3) Spray Patterns. Overlapped areas may only be counted once toward meeting the total application area requirement.

     (c) Testing and minimum standard requirements. The owner of the aerobic system is responsible for meeting the testing requirements and minimum standards specified in Appendix D. The results shall be submitted to the local DEQ within thirty (30) days of sampling in a format approved by the DEQ.

     (d) Application Rate. The application rate shall be adjusted and maintained in a manner which will not allow runoff.

APPENDIX D. SAMPLING FREQUENCY & TESTING REQUIREMENTS FOR ON-SITE SURFACE APPLICATION OF TREATED SEWAGE

The following tests shall be performed on the effluent and the specified criteria met for aerobic sewage treatment systems that utilize surface application of treated wastewater: