The subdivider shall confer with local postal authorities to determine whether cluster mailboxes will be required. If clustering is not required, the subdivider shall provide a letter from the Postmaster stating the exemption. If clustering is required, proposed easements or other provisions shall be included on the tentative subdivision map or tentative parcel map. The final map shall include these provisions as approved. The improvement plans shall include provision of concrete pads with necessary hardware (at the developers expense) to allow the post office to attach their mailboxes. The location of such units shall be approved by the local postal service and the Public Works Department.
(`67 Code, § 11-3-19)