All required improvements, except septic tanks and other associated structures, shall be subject to the inspection and approval of the Borough Engineer or other agency having jurisdiction, who shall be notified in writing by the applicant at least 48 hours prior to the start of construction. No underground installation shall be covered until it has been inspected and written approval by the Borough Engineer or other agency having jurisdiction delivered to the applicant. A copy of such approval shall be sent to the Borough Clerk. Approval of an installation does not constitute acceptance of the installation of public improvements shall be at the expense of the applicant and shall be paid by applicant pursuant to Subsection 18-13.25. Inspection costs shall be paid by the Borough upon vouchers duly submitted and approved. The Borough Clerk shall maintain a record of all inspection costs chargeable to the project and upon release of the performance guarantee and/or acceptance of the public improvements and release of the maintenance, the Borough Clerk shall return to the applicant any monies in excess of the total inspection costs up to the amount deposited. If the inspection costs exceed the amount deposited with the Borough Clerk, the applicant shall pay such additional amount as required to cover the total inspection costs.