(2) CONDITIONS FOR RELEASE. Conditions for the release of the financial guarantee are as follows:
(a) The Director of Public Works or his designee shall release the portion of the financial guarantee established under this section, less any costs incurred by the City of Marshfield to complete installation of BMPs, upon submission of "as built plans" by a licensed professional engineer. The Director of Public Works or his designee may make provisions for a partial pro-rata release of the financial guarantee based on the completion of various development stages.
(b) The Director of Public Works or his designee shall release the portion of the financial guarantee established under this section to assure maintenance of BMPs, less any costs incurred by the City of Marshfield, at such time that the responsibility for practice maintenance is passed on to another entity via an approved maintenance agreement.