Prior to approval of such use, the owner or his agent shall execute a certified check made payable to the Township of Washington or, in lieu of such check, a bond sufficient to secure the rehabilitation of the site in accordance with the plan required by Subsection C(1)(g) above. Any such check or bond shall be approved by the Board of Supervisors as to form, sufficiency and manner of execution. The amount of such check or bond may be reduced or increased when, in the opinion of the Board of Supervisors and after a public hearing, the amount would be inappropriate to accomplish its purpose. In the event that the owner or his agent does not fulfill the conditions of the bond, the Township shall, after due notice to the operator and to his bonding or surety company and upon their failure to comply with the terms of the site plan approval, proceed to rehabilitate the premises in accordance with the plan prescribed by Subsection C(1)(g) above, either with its own forces or by contract, and shall charge the costs to the owner, his agent or his bonding or surety company.