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Erosion and sediment control plans prepared pursuant to this chapter shall comply with all of the following:

A. The erosion and sediment control plan need not be a separate sheet if all facilities and measures can be shown on the grading sheets without obscuring the clarity of either the grading plan or the erosion and sediment control plan.

B. An erosion and sediment control plan shall be required for all engineered grading plans, and whenever:

1. The graded portion of the site includes more than 10,000 square feet of area having a slope greater than 10 percent;

2. Clearing and grubbing of areas of one acre or more regardless of slope;

3. There is a significant risk that more than 2,500 square feet will be unprotected or inadequately protected from erosion during any portion of the rainy season;

4. Grading will occur within 150 feet of any watercourse;

5. The Planning Department in consultation with the County Engineer determines that the grading will or may pose a significant erosion or sediment discharge hazard for any reason.

C. All disturbed areas shall be stabilized by appropriate erosion and/or sediment control measures by October 15th of each year, be capable of being winterized within 48 hours. The Planning Director may require suspension of any and all grading activities between October 15th and May 1st without prior notice.

D. Erosion and sediment control plans shall include an effective revegetation program to stabilize all disturbed areas, which will not be otherwise protected. All such areas where grading has been completed between April 1st and October 15th shall be planted by November 1st. Graded areas completed at other times of the year shall be planted within 15 days. If revegetation is infeasible or cannot be expected to stabilize an erodible area with assurance during any part of the rainy season and the unstable area exceeds 2,500 square feet, additional erosion and sediment control measures or irrigation of planted slopes may be required as appropriate to prevent increased sediment discharge.

E. Erosion and sediment control plans shall be designed to prevent increased discharge of sediment at all stages of grading and development from initial disturbance of the ground to project completion. Every feasible effort shall be made to ensure that site stabilization is permanent. Plans shall indicate the implementation period and the stage of construction where applicable.

F. Erosion and sediment control plans shall comply with the recommendations of the responsible civil engineer, geotechnical engineer, engineering geologist, or landscape architect involved in preparation of the grading plans.

G. The structural and hydraulic adequacy of all storm water containment or conveyance facilities shown on the erosion and sediment control plans shall be verified by a civil engineer, and he or she shall so attest on the plans. Sufficient calculations and supporting material to demonstrate such adequacy shall accompany the plans when submitted.

H. Erosion and sediment control plans shall be designed to meet anticipated field conditions.

I. Erosion and sediment control plans shall provide for inspection and repair of all erosion and sediment control facilities at the close of each working day during the rainy season and for specific sediment cleanout and vegetation maintenance criteria.

J. Erosion and sediment control plans shall comply with any and all standards and specifications adopted herein for the control of erosion and sedimentation on grading sites. These standards and specifications shall be in general compliance with the current Erosion and Sediment Control Guidelines for Developing Areas of the Sierra Foothills and Mountains, published by the High Sierra Resource Conservation District.