(a) Construction Standards. After the installation of all utility and storm water drainage improvements, the subdivider shall construct concrete curbs and gutters of a twenty-four (24) inch wide roll-type. Curbs shall be a minimum of ten (10) inches thick at the pavement edge and twelve (12) inches thick at the rear edge. Curbs shall have three and one-half (3.5) inch minimum aggregate base integral with street base. Curbs shall also be constructed with expansion joints every one hundred (100) feet and additional scoring every twenty (20) feet. Special attention should also be made when grading adjacent to completed curbs, where sufficient said depth should be achieved so that soils do not wash away to the storm sewer system from lots. The subdivider shall further be required to install all such required concrete curbs and gutters in conformance with applicable State and Federal building codes and regulations, as amended from time to time, as well as the Americans with Disabilities Act (ADA), as amended from time to time.

Concrete for curbs and gutters shall have a twenty-eight (28) day compressive strength of four thousand (4,000) psi minimum (INDOT class A concrete mix) and have no more than a four (4) inch slump.

(b) Payment in Lieu of Installation. In extraordinary circumstances, the Plan Commission may determine that the installation of curbs and gutters is impossible or illogical within the proposed subdivision or amendment and/or replat of subdivision. If the Plan Commission makes this determination, as an alternative to providing curbs and gutters, a subdivider may make payment to the Town of St. John sidewalk, curb and gutter standard fund in an amount equal to ninety (90) percent of the total cost of the installation of curbs and gutters. The payment in lieu of installing curbs and gutters shall be computed on the basis of the current average cost per linear foot of curb and gutter required, as determined by the Town Engineer. A subdivider's payment to the Town of St. John sidewalk, curb and gutter installation fund under this section does not obligate the Town to install curbs and gutters at any time on the subdivider's property. The subdivider's payment to the Town of St. John sidewalk, curb and gutter installation fund may be used to install curbs and gutters anywhere in the Town. Payment in lieu of installation of curbs and gutters shall release the subdivider from the responsibility to install curbs and gutters at the present time or any time in the future in those specific areas and locations identified by the Plan Commission. If the Plan Commission determines that the installation of curbs and gutters is impossible or illogical and the subdivider instead makes payment to the Town of St. John sidewalk, curb and gutter installation fund, this information shall be included in writing on the recorded plat of the subdivision.