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be used for the disposal or treatment of sewage except for undeveloped parcels that have received site evaluation approval and/or permit approval before enactment of this plan. Also excepted are dwellings served by

disposal/treatment systems existing at the time of passage of these regulations; such systems must be properly sited (approved site

evaluation) and permitted or in accordance with the Delaware, Franklin or Union county health departments and/or the Ohio Environmental Protection Agency. Existing failing systems within the SCPZ can be upgraded with approval of the county health department and/or OEPA.

Removal of topsoil, sand, gravel, rock, native ground cover/vegetation, oil or gas. There shall be no removal of any of these substances nor any other change in topography other than what is caused by natural forces (with the exception of permitted uses or as approved by the City Engineer).

Herbicides/ pesticides. There shall be no use of herbicides or pesticides except as approved by the City Engineer.

Geologic features impart much of Dublin’s natural character. The topography to the east of the Scioto River is steeply sloped and

characterized by exposed limestone. Delaware limestone is the most notable bedrock, but Ohio shale, Olentangy shale, Columbus limestone and Salina dolomite also exist within the City limits. Bedrock affects the vegetation that exists in a given area more than any other single factor. It is the material on which the soils are formed. Delaware limestone, in particular, fosters the presence of several rare plants, including the blue ash and spreading rock cress, which otherwise would not be found in this portion of Ohio.

Native Americans and settlers introduced new plants to the area. Plant introductions occurred for a variety of reasons, including food, shelter, entertainment, visual beauty and emotional attachment to flora from settlers’ homelands. Introductions and land clearing for

development and agriculture changed the plant communities. Many of the introductions have no negative effect on the remaining natural environments, but some plants out-compete the native species, causing degradation of the ecological balance of the plant community.