A. As a condition for the issuance of a permit, the Planning Department may require the deposit of improvement security in sufficient amount deemed necessary to assure performance of the work in the event of default on the part of permittee or, in the case of a subdivision, where the permittee does not proceed with preparation and obtaining the approval of a final map. Such security shall be in a form acceptable to Sierra County.

B. In the case of subdivisions, the improvement security shall remain in effect until final inspections have been made of all grading work and the Board of Supervisors of Sierra County has accepted the subdivision improvements.

C. For projects other than subdivisions, the improvement security shall remain in effect until final inspections have been made and all grading work and erosion control have been approved by the Planning Department.

D. In addition to the improvement security, the Planning Department may also require the deposit of maintenance security in sufficient amount deemed necessary to guarantee and maintain the grading work and to assure the proper functioning of drainage systems and adequate erosion and sedimentation control. Such maintenance security shall be in a form acceptable to Sierra County and shall remain in effect for a period of one year after the date of acceptance of the improvements as designated in subsections (B) and (C) of this section.

E. Any deposit required by the Planning Department pursuant to this chapter shall be payable to the Sierra County Planning Department.

F. Upon satisfaction of applicable provisions of this chapter, the improvement and maintenance security deposits will be released. However, upon failure to complete the work, failure to comply with all of the terms of the permit, or failure of the completed site to function properly to provide proper drainage or erosion and sedimentation control, the county may do the required work, or cause it to be done and collect from the permittee or surety all costs incurred thereto, including administrative, inspection and legal costs.