Performance-based treatment systems shall be installed in compliance with the following.

1. (1) Systems shall receive the following setbacks to the listed feature. If no setback is specified for a specific feature, Part I requirements shall apply unless the performance-based treatment system is located in the Florida Keys. If located in the Florida Keys, Part II shall be used for all setbacks.

   1. (a) Secondary Treatment Standards. The system shall be a minimum of 65 feet from any surface water bodies or wet retention or detention area if the lot was platted on or after January 1, 1972.

   2. (b) Advanced Secondary Treatment Standards.

      1. Surface water bodies: The system shall be a minimum of 50 feet from any surface water bodies or wet retention or detention area if the lot was platted on or after January 1, 1972.

      2. Groundwater interceptor drain: 10 feet.

      3. Dry retention area and swales: 10 feet.

      4. Where a performance-based treatment system is placed adjacent to Class II waters, setbacks that are applied to secondary treatment levels shall be applicable. Alternatively, where the fecal coliform complies with the following levels, reduced setbacks in subparagraphs 62-6.028(1)(b)1. through 3., F.A.C., above, shall be allowed.

      a. System operation shall result in not more than 14 fecal coliform colonies per 100 ml of effluent sample. Where chlorine is used for disinfection, the design shall include provisions for rapid and uniform mixing and a total chlorine residual of at least 1.0 mg/l shall be maintained after at least 15 minutes contact time at the peak hourly flow. To determine compliance of a system, the following operational criteria (using either MF or MPN methods) are applicable.

      b. The arithmetic mean of the fecal coliform colonies collected during the annual period shall not exceed 14 per 100 ml of effluent.

      c. The median value of the fecal coliform colonies for a minimum number of 10 samples of effluent, each collected on a separate day during a period of 30 days (monthly) shall not exceed 14 per 100 ml of sample.

      d. No more than 10% of the samples collected during the period of 30 consecutive days shall exceed 43 fecal coliform colonies per 100 ml of sample.

      e. Any one sample shall not exceed 86 fecal coliform colonies per 100 ml of sample.

   3. (c) Advanced Wastewater Treatment Standards.

      1. Surface water bodies: The drainfield shall be a minimum of 25ꞌ feet from any surface water bodies or wet retention or detention area. The treatment unit or process containers shall be a minimum of 50ꞌ feet from any surface water bodies or wet retention or detention area.

      2. Groundwater interceptor drain: 10ꞌ feet.

      3. Dry retention area and swales: 10ꞌ feet.

      4. Seasonal high water table to bottom of drainfield: 12ꞌꞌ inches.

2. (2) Systems designed to meet secondary treatment standards shall be allowed to exceed their authorized lot sewage flow allowances by up to 25%. Systems designed to meet advanced secondary treatment standards shall be allowed to exceed their authorized lot sewage flow allowances by up to 50%. Systems designed to meet advanced wastewater treatment standards shall be allowed to exceed their authorized lot sewage flow allowance by up to 100%. For example, if authorized lot flow is 200 gallons per day, a total of 300 gallons per day lot flow will be allowed for systems designed to meet advanced secondary treatment standards.

3. (3) Hydraulic surge storage – the design shall protect the residence from backflow into the treatment tank. For gravity and pumped systems, the following shall apply:

   1. (a) For aggregate systems, the porosity shall be calculated at 33%.
   2. (b) The effective storage volume of the drainfield shall be equal to or greater than 1.5 times the design daily flow.
   3. (c) The total storage volume of the drainfield shall be equal to or greater than 1.8 times the design daily flow.

4. (4) Infiltrative surface area reductions shall be allowed for systems designed to reduce the wastewater strength of the effluent where the drainfield is sized based on slightly limited soils. The baseline system shall be used for comparison with a typical average CBOD5 of 140 mg/l and TSS of 105 mg/l. The maximum reduction in infiltrative surface area shall not exceed the following standards.

   1. (a) Secondary treatment standards: 25% reduction.
   2. (b) Advanced secondary treatment standards: 40%.
   3. (c) Advanced wastewater treatment standards: 40%.

Rulemaking Authority 381.0065(3)(a) FS. Law Implemented 381.0065, 386.041 FS. History–New 2-3-98, Amended 3-22-00, 6-25-09, 7-16-13, Formerly 64E-6.028.