1. Accessory uses such as lawns, gardens or play areas, except in wetlands;

2. Agricultural uses conducted without locating a structure or altering landforms;

3. Public and private conservation areas for water, soil, open space, forest and wildlife resources;

4. Removal of poison oak, tansy ragwort, blackberry or other noxious vegetation;

5. Fences.

1. Installation of underground utilities and construction of roadway improvements including sidewalks, curbs, streetlights and driveway aprons;

2. Minimal ground disturbance(s) but no landform alterations.

1. Any area containing slopes greater than or equal to fifteen percent and two of the following subsections;

2. Any area potentially unstable as a result of natural drainageways, rapid stream incision, or stream bank erosion;

3. Any area located on an alluvial fan, presently subject to or potentially subject to inundation by debris flows or deposition of stream transported sediments;

4. Any area containing slopes greater than or equal to twenty percent.

1. Declares that the applicant has no knowledge that sensitive areas on the development proposal site have been illegally altered, and that the applicant previously has not been found in violation of sensitive areas regulations for any property in Columbia County;

2. Demonstrates that any development proposal submitted conforms to the purposes, standards and protection mechanisms of this chapter;

3. If required, prepare a special sensitive areas study in accordance with Section 17.86.070;

1. Substantial construction of the approved plan has not completed within a one-year period; or

2. Construction on the site is a departure from the approved plan.

1. No changes are made on the original plan as approved by the approval authority;

2. The applicant can show intent of initiating construction of the site within the one year extension period;

3. There have been no changes to the applicable comprehensive plan policies and ordinance provisions on which the approval was based;

4. There have been no naturally occurring or manmade changes to the landform.

1. Land form alterations shall preserve or enhance slope stability;

2. The proposed land form alteration or development will not result in erosion, stream sedimentation, ground instability, or other adverse on-site and off-site effects or hazards to life or property;

3. Land form alterations or developments address stormwater runoff, maintenance of natural drainageways, and reduction of flow intensity by the use of retention areas;

4. The structures are appropriately sited and designed to ensure structural stability and proper drainage of foundation and crawl space areas for development with any of the following soil conditions: wet/high water table; high shrink-swell capability; compressible/organic; and shallow depth-to-bedrock;

5. Where natural vegetation has been removed due to land form alteration or development, the areas not covered by structures or impervious surfaces will be replanted to prevent erosion in accordance with Chapter 17.100;

6. The water flow capacity of the drainageway is not decreased or the drainageway will be replaced by a public facility of adequate size to accommodate maximum flow;

7. The necessary U.S. Army Corps of Engineers and state of Oregon Land Board, Division of State Lands and Department of Environmental Quality approvals shall be obtained;

8. No development, building, construction or grading permit may be issued on lands in the slope hazard area until the public works director approves:

1. One reproducible copy of the development plan(s) and necessary data or narrative which explains how the development conforms to the standards. Sheet size for the development plan(s) and required drawings shall not exceed eighteen inches by twenty-four inches and the scale for all development plans shall be an engineering scale;

2. A list of the names and addresses of all who are property owners of record within two hundred feet of the site.

1. Existing site conditions including vicinity map showing the location of the property in relation to adjacent properties and including parcel boundaries, dimensions and gross area;

2. The location, dimensions and names of all existing and platted streets and other public ways, railroad tracks and crossings, and easements on adjacent property and on the site and proposed streets or other public ways, easements on the site;

3. The location, dimensions and setback distances of all existing structures, improvements, utility and drainage facilities on adjoining properties and existing structures, water, sewer, improvements, utility and drainage facilities to remain on the site; and proposed structures, water, sewer, improvements, utility and drainage facilities on the site;

4. Contour lines at two-foot intervals for slopes from zero to ten percent and five-foot intervals from slopes over ten percent;

5. The drainage patterns and drainage courses on the site and on adjacent lands;

6. Potential natural hazard areas including:

7. The location of trees having a six-inch caliper at four feet. Only those trees that will be affected by the proposed development need to be sited accurately. Where the site is heavily wooded, an aerial photograph at the same scale as the site analysis may be required;

8. Identification information, including the name and address of the owner, developer, and project designer, and the scale and north arrow;

9. A grading and drainage plan that includes:

10. The method for mitigating any adverse impacts upon wetland, riparian or wildlife habitat areas. (Ord. 634 § 1 Exh. A, 1995)