The following requirements shall govern sanitary sewer improvements:
(a) Where an adequate public sanitary sewer system is reasonably accessible, in the determination of the Planning Commission, the County Sanitary Engineer, and Municipal Engineer, public sanitary sewers shall be installed to adequately serve all lots, including lateral connections to the public system. Public sewer system extensions shall meet the requirements of the Ohio Environmental Protection Agency. Combinations of sanitary sewers and storm sewers shall be prohibited.
(b) Where a public sanitary sewer system is not reasonably accessible, the subdivider may request a variance from the Commission:
(1) A temporary sanitary sewerage system for the group, provided that such temporary sanitary sewerage system is installed in accordance with the Ohio Environmental Protection Agency, the County General Health District regulations and the County Sanitary Engineer. The Defiance County Board of Commissioners should be consulted early for the standard procedure for County authorization by signed agreement.
(2) Lots may be served by individual disposal systems if the provisions of subsection (c) hereof are met.
(c) (1) Where installation of individual disposal systems is considered, the suitability of the soil for individual systems, the absorptive ability of the soil, surface drainage, groundwater level and topography shall be the criteria for determining whether or not the installation of individual systems is permissible. Criteria shall be in accordance with the requirements of the County General Health District and the requirements of the Ohio Environmental Protection Agency.
(2) Each lot so served.shall be of a size and shape to accommodate the necessary length of tile field at a safe distance from and at a lower elevation than the proposed buildings. Such lot size and shape shall conform to the requirements of the zoning district in which they are located.
(3) At least one percolation test shall be made for each lot area being platted, and each test shall be located in close proximity to the proposed individual sewage disposal unit, be numbered and its location shown on the preliminary plat. All percolation tests shall be performed in accordance with the requirements of the Commission and the County General Health District.
(4) Where the installation of individual disposal units is considered and where the average natural ground slope exceeds ten percent (10%), the installation of a step-up disposal system may be required subject to specification by the County General Health District.