Chapter 15.60
STREET SURFACING

Sections:

15.60.010    General.

15.60.020    Minimum road section.

15.60.030    Aggregate size.

15.60.040    Asphalt seam location.

15.60.050    Warranty repairs.

15.60.060    Manholes and valve boxes.

15.60.010 General.

All street surfacing shall comply with the APWA Standard Specifications, unless noted otherwise in this chapter.

A soils investigation shall be performed for all new roads and those roads for which work will be performed. The results of this investigation and a design of the road cross-section shall be submitted to and accepted by the city engineer or his/her designee. This chapter covers the preparation of subgrade, the placing of base gravel, and the placing of asphalt surface on any city street. [Ord. O-03-2010 § 1 (Exh. A § 12.010)].

15.60.020 Minimum road section.

Unless approved otherwise by the city engineer or his/her designee, the public works director, or as directed by the city council, a minimum of nine inches of engineered fill, meeting Type A1 or A2 classifications as set forth by AASHTO, shall be placed over scarified native earth material. The minimum thickness of road base shall be six inches when used in conjunction with the engineered fill. The minimum thickness of asphalt in a city road shall be three inches. The subbase is to be prepared in accordance with the geotechnical report. If soils exhibit pumping, additional preparations may also be required as detailed in the geotechnical report, which may include over-excavation of materials or the placement of a geotextile fabric. Methods of remediation must be approved by the city engineer or his/her designee. [Ord. O-03-2010 § 1 (Exh. A § 12.020)].

15.60.030 Aggregate size.

A one-half-inch minimum mix design is to be used on all residential streets. All collector roads shall require a minimum three-quarter-inch mix design. [Ord. O-03-2010 § 1 (Exh. A § 12.030)].

15.60.040 Asphalt seam location.

The contact point of two adjacent asphalt placements shall be located such that the seam is at a minimum five feet from the projected edge of the lip of gutter on the higher volume roadway. Cross gutters may be required for all roadways intersecting off a roadway classified as a collector road as directed by the city engineer or his/her designee. [Ord. O-03-2010 § 1 (Exh. A § 12.040)].

15.60.050 Warranty repairs.

The city engineer or his/her designee shall determine at the time of the walkthrough the minimum type of surface maintenance that will be required for the subdivision or portions thereof. Crack sealing of seams will be required at a minimum for seams with horizontal gaps greater than one-fourth inch, or in instances which exhibit vertical separation. Slurry seals may be required in instances when asphalt patching occurs on more than 40 percent of any portion of the roadway. All slurry seals will be a Type II slurry.

All streets shall be swept clean prior to placement of slurry seal. All manholes and valves, including concrete collars, shall be protected from slurry seal. Any slurry seal in gutters or on other concrete shall be removed. A leveling coarse shall be applied where needed before the final slurry seal is laid. [Ord. O-03-2010 § 1 (Exh. A § 12.050)].

15.60.060 Manholes and valve boxes.

All manhole covers and valve boxes shall be raised to the proper grade after the placement of pavement. The cover shall be removed and raised to the proper elevation with concrete setting the frame one-quarter inch below the pavement grade. The following types of rings can be used:

A. Four thousand psi concrete can be used with epoxy coated rebar.

B. Six thousand psi concrete can be used with fiber mesh. [Ord. O-03-2010 § 1 (Exh. A § 12.060)].