Class IV composting facilities must meet the design standards of Class III facilities, with the addition of the following design standards. The owner or operator must submit an engineering design for approval with the facility permit application.

1. (1) Location restrictions. Facilities shall meet the location restriction outlined in OAC 252:515-5-52(e) Airports.

2. (2) Working surfaces. The working surfaces for all receiving, mixing, active composting, and storage areas must be designed, constructed, and maintained to prevent conditions of contamination, pollution, and nuisance. All working surfaces must exhibit a hydraulic conductivity of 1x10^-7 cm/second, or less and meet one of the following construction and material specifications:

   1. (A) impermeable material such as concrete, asphalt, or similar approved impervious material designed to prevent the infiltration of contact water into the groundwater;
   2. (B) compacted clay, with a minimum thickness of two feet and protected from desiccation and installed in a manner such that the integrity will not be impaired by the operation of heavy equipment used at the composting and storage area; or
   3. (C) an equivalent engineered alternative approved by DEQ.

Added at 34 Ok Reg 1199, eff 9-15-17