The County may inspect the plant or business of a contractor or any subcontractor under any contract awarded or to be awarded by the County. The County shall be entitled to audit the books and records of a contractor or any subcontractor under any contract or subcontract entered under this Subtitle. Such books and records shall be maintained by the contractor for a period of three (3) years from the date of final payment under the prime contract and by the subcontractor for a period of three (3) years from the date of final payment under the subcontract.