S.C. Code Ann. § 12-28-2350

The department may inspect all records of a person doing business in this State for the purpose of ascertaining information relative to the sales, transportation, or possession of petroleum products. Legible records must be kept at the point of origin or reasonable approved proximity for auditing purposes. Terminal operators and suppliers as defined in Section 12-28-110 may maintain records at an approved central recordkeeping facility within or outside the State.