S.C. Code § 4-5-120
Whenever the governing body of a county by resolution requests that a part of such county be merged with one or more adjoining counties or whenever ten percent of the registered voters in an area of one county petition in writing that such area be transferred to another county, the county governing body or the petitioners, as the case may be, shall deposit with the clerk of court of such county an amount of money sufficient to cover the expenses of surveys and plats and of the annexation commission and the election to be held to determine whether the proposed annexation shall be effected and shall file such resolution or petition in the office of the clerk of court of such county and transmit the petition or resolution to the Governor.
S.C. Code § 4-5-120