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A. Except for the specific exemptions listed in SCC 12.08.070, no person shall do or permit to be done any grading on any site in the unincorporated areas of Sierra County without a valid grading permit obtained from the Department of Planning and Building.

B. All grading and grading work, as defined in this chapter, shall fall under one of three categories:

1. Exempt grading (no permit required; see SCC 12.08.070);

2. Regular grading (permit required, but not engineering; see SCC 12.08.280);

3. Engineered grading (permit and engineered plans required; see SCC 12.08.290).

C. A grading permit is required for any grading and/or other construction activity with ground disturbance of one acre or more.

D. A building or grading permit based on engineered plans shall also be required for the following:

1. Retaining walls which are over four feet in height, as measured from bottom of footing to top of the retained soil;

2. Any retaining wall that is subject to surcharge;

3. Private vehicular bridge;

4. Swimming pool, pond or reservoir fill operations whereby depth of fill for construction or height of dam or other form of retention exceeds three feet.