MEMORANDUM
TO: Timothy Navarre, Assembly President
Members, Kenai Peninsula Borough Assembly
THRU: Dale Bagley, Mayor
THRU: Colette Thompson, Borough Attorney
FROM: Holly B. Montague, Assistant Borough Attorney
DATE: June 4, 2002
SUBJECT: Ordinance 2002-13 Road Construction Standards
As indicated in the memo at page 35 of the June 4, 2002 assembly packet, typical section drawings were revised to be consistent with proposed amendments to KPB 14.06. It is requested that the following amendments to Ordinance 2002-13 be made.
Amend Section 3 as follows:
SECTION 3. That KPB 14.06.120(A) is hereby amended as follows:
A. Typical section. Gravel roads shall be constructed in accordance with the Gravel Road Typical Section drawing [(see Drawing A-1 attached)] and associated Table A. Additional requirements are:
1. Roads must be contiguous with the existing road system maintained by the borough and the state. All roads must be on a dedicated right-of-way and must be built along the right-of-way centerline. Minimum right-of-way width shall be 60 feet, enabling utilities to be installed outside the edge of roadside ditches. Minimum width for culs-de-sac serving no more than six lots which cannot be further subdivided is 50 feet.
2. All organic material shall be stripped and removed to a minimum depth of four feet below finished grade. If geotextile is utilized over organics, then the depth of subbase must be three feet minimum or greater as required for stable embankment.
3. Extraction of material between the ditch lines for any purpose other than excavation to subgrade is prohibited.
4. Geotextile shall be placed over all subgrade soils consisting of silts or clays with a frost classification of F-4 (U.S. Corps of Engineers.)
5. The roadway embankment shall be placed in lifts and compacted to not less than 90% of maximum density. Maximum density shall be determined by AASHTO T 180, Method D.
6. In place [of] usable excavation material meeting the specifications of the required embankment material may be utilized in lieu of borrow.
Amend Section 4 as follows:
SECTION 4. That KPB 14.06.120(B) is hereby amended as follows:
B. Project specific design.
1. A project specific design may be submitted if prepared and sealed by a licensed professional civil engineer. The design shall include typical sections(s), centerline plan and profile. The design shall provide for adequate drainage. The design shall be based on a soils investigation with test holes at least every 500 linear feet. A report shall be submitted with test hole logs and soil analyses. Project specific designs are subject to approval by the RSA Board prior to construction. The RSA Board may require a project-specific as-built, engineering analysis and design to address existing or proposed roads.
2. Category IV roads require a project specific design prepared and sealed by a licensed professional civil engineer in accordance with the Category IV Gravel Road Typical Section drawing and associated Table A. The design shall be approved by the RSA Director before construction begins. Once the project is complete, as-built plans, prepared and sealed by a licensed professional civil engineer, shall be submitted to the RSA. The as-built shall illustrate constructed horizontal alignment, finish grade profile, typical section of the roadbed, and material specifications. The as-built plans are required prior to acceptance by the RSA board of the road for temporary maintenance.
Add a new Section 5 as follows:
SECTION 5. That KPB 14.06.120(C) is hereby amended as follows:
C. Alternate construction method. Alternate construction methods may be utilized for Category I and Category II roads where soil, economic and other conditions are such that the standard typical section is not practical. It is the developer's responsibility to construct a functional road that will be suitable for traffic and maintenance operations. Final acceptance by the RSA will be based on inspection and performance testing. Roads constructed under this alternate method must meet the following requirements:
1. A RSA application must be filed prior to start of construction.
2. The road must meet the minimum requirements shown on the Alternate Typical Section drawing and associated Table A [(see Drawing A-2 attached)].
3. Three inspections are required by the RSA, consisting of initial, midway and final inspections. The final inspection will be conducted one year after the initial application, during the summer season when the subgrade and roadbed are frost free. Photographic documentation will be done by the RSA representative.
4. The applicant must provide the means to conduct a proof roll test during the final inspection. The proof roll test will consist of a fully loaded 12 cubic yard end dump truck traversing the road as directed by the inspector. The minimum proof rolling is full length of the road, on both lanes. If excessive rutting, greater than three inch depth tracks, occurs, remedial work will be required. The RSA representative will designate the defective areas in a written report.
5. Winter maintenance only will be provided during the interim period for one year.
Renumber Sections 5 and 6 to 6 and 7.
Insert a new Section 8 as follows:
SECTION 8. That KPB 14.06.170 is amended as follows:
A. Description. The work under this section consists of the performance of all work required for the construction of asphalt concrete pavement on a prepared base [(see Drawing A-3 attached)] (see Paved Road Typical Section drawing and associated Table A). Current editions of "Standard Specifications for Highway Construction," as adopted by the Alaska Department of Transportation and Public Facilities and the "Standard Specifications for Streets, Drainage, and Utilities," as adopted by the Municipality of Anchorage will be the references used for asphalt paving.
B. Material and testing.
1. Asphalt. The contractor shall submit a certified analysis of the asphalt to the RSA for review and approval. The RSA reserves the right to make check tests of the asphalt at the project site, and if the asphalt is not in accordance with the certified analysis he may reject the materials.
The asphalt required by these specifications shall conform to the requirements of The Asphalt Institute for the type and grade and shall comply with ADOT/PF specifications used in the area.
The contractor/developer, at their own expense, will be required to perform field tests measuring aggregate gradation and fracture, asphalt content and compaction. Test results shall be in conformance with pavement mix design requirements and shall be stamped by an Alaska licensed professional civil engineer.
The prepared base shall meet the standards for a Category III road. Inspection of the subbase, by a RSA approved party, is required prior to paving.
C. Certification of design. The RSA requires the asphalt pavement mix design be submitted and stamped by an Alaska licensed professional civil engineer. Process quality control records for aggregate shall be submitted with the asphalt pavement mix design.
D. Other specifications. The RSA will use the same specifications previously cited to address seal coat, prime coat, paving geotextile and recycled asphalt paving.