Action by governing body. The Borough Council, by resolution, shall either approve the bonded improvements determined to be complete and satisfactory by the municipal engineer, or reject any or all of these improvements upon the establishment in the resolution of cause for rejection, and shall approve and authorize the amount of reduction to be made in the performance guarantee and the "safety and stabilization bond" relating to the improvements accepted, in accordance with the itemized cost estimate prepared by the municipal engineer and appended to the performance guarantee pursuant to this section. This resolution shall be adopted not later than 45 days after receipt of the list and report prepared by the municipal engineer. Upon adoption of the resolution by the Borough Council, the obligor shall be released from all liability pursuant to its performance guarantee and "safety and stabilization bond," with respect to those approved bonded improvements, except for that portion adequately sufficient to secure completion or correction of the improvements not yet approved; provided that 30% of the amount of the total performance guarantee and "safety and stabilization bond" posted may be retained to ensure completion and acceptability of all improvements. For the purpose of releasing the obligor from liability pursuant to its performance guarantee and "safety and stabilization bond, " the amount of the performance guarantee and "safety and stabilization bond" attributable to each approved bonded improvement shall be reduced by the total amount for each such improvement, in accordance with the itemized cost estimate prepared by the municipal engineer and appended to the performance guarantee pursuant to Subsection A(1) of this section, including any contingency factor applied to the cost of installation. If the sum of the approved bonded improvements would exceed 70% of the total amount of the performance guarantee, then the municipality may retain 30% of the amount of the total performance guarantee and "safety and stabilization bond" to ensure completion and acceptability of all improvements, as provided above, except that any amount of the performance guarantee attributable to bonded improvements for which a temporary certificate of occupancy bond has been posted shall be released from the performance guarantee even if such release would reduce the amount held by the Borough to below 30%. If any portion of the required improvements is rejected, the Borough may require the obligor to complete or correct such improvements and, upon completion or correction, the same procedure of notification, as set forth in this section shall be followed.