12.12.050 Construction specifications.
A. Interim (Winter) Specifications. At the time of pre-inspection if the public works director (or designee) determines that the soil conditions are unacceptable for the construction of a permanent driveway apron (i.e., frozen), the city inspector will specify interim construction standards for a temporary driveway apron as well as the standards to which the driveway apron must be upgraded after breakup. The expiration date for a permit issued under such circumstance will be set by the city inspector.
B. Material Type. Any driveway apron connecting to a public thoroughfare surfaced with crushed rock, asphalt pavement or other surfacing material shall be surfaced with the same material, asphalt pavement, or other approved material.
C. Gravel. Gravel shall be well-graded and non-frost susceptible, with 100 percent passing a three-inch sieve and less than six percent passing a No. 200 sieve and laid a minimum of two feet deep. Deeper gravel in a large fill will have 18-inch maximum rock size.
D. Asphalt Pavement. Asphalt pavement on driveway aprons shall be a minimum of two inches in depth, laid on minimum two inches D1 leveling course, on a base listed in subsection (C) of this section or as specified by the city inspector.
E. Culverts.
1. The bedding material within a minimum of six inches of a culvert shall have 100 percent passing a three-inch sieve; and
2. All culverts shall be corrugated metal pipe or other material approved by the public works director (or designee), and shall have a minimum diameter of 12 inches, unless a larger culvert is necessary to handle the drainage.
F. Lighting. For illumination required under WMC 12.12.040(G), unless otherwise specified in the permit, the lighting materials and installation shall conform with Section 660, Signals and Lighting, of the Alaska Standard Specifications for Highway Standard Details L-03.00, L-10.00, L-14.00, L-20.00, L-23.00, L-30.00, (the most recent edition).
G. Site Safety. During construction appropriate and adequate safety measures (barricades, lights, signs, flagmen, etc.) must be taken to protect the public. The public thoroughfare may not be closed to the public without prior approval of the public works director (or designee). A minimum of one 10-foot-wide traffic lane must be kept open to traffic on the public thoroughfare at all times.
H. Utilities. Utility relocation is the responsibility of the permittee.
I. Curb, Gutter and Sidewalk. Existing or broken curb and/or gutter and/or sidewalk shall be removed for the full width of the driveway apron with a saw cut at the nearest expansion joint or score mark. A form board must be used at the gutterlip and the pavement restored to current specifications.
J. Excavated Material. All material other than gravel used in the driveway, excavated in the construction of driveway aprons or building projects and deposited on public rights-of-way shall be removed. The dumping of frost susceptible material, stumps, etc., on public rights-of-way will be considered as an unauthorized encroachment and subject to removal under WMC 12.16.050 through 12.16.070. (Prior code § 14.15.050)