The use of permeable paving should be considered as appropriate to meet OSU sustainability initiatives.
Multi-use paths require a minimum of 4-inches of Class “C” asphalt (2-2 inch lifts) over 6-inches of ¾”-0” base rock and subgrade geotextile.
The design should try to match existing grade, in order to minimize elevation differences at the edges.
Compaction of exposed edges should be called out on design.
Non-thoroughfare paving sections (i.e., parking lots) accessible to cars require 4-inches of Class “C” asphalt (2-2 inch lifts) over 12-inches of ¾”- 0” base rock.
Streets, alleys, and access ways for trucks and buses, including thoroughfares through parking lots require, at minimum 4-inches of Class “C” asphalt (2-2 inch lifts) over 18-inches of ¾”-0” base rock.
PCC Paving Sections
All Portland cement concrete (PCC) paving and slab sections are required to have 6-inches of ¾”-0” base rock and 6-inches of 4,000 psi concrete, as a minimum.
If vehicles have any possibility of access to the paving section, then reinforcing bars (ASTM A615, Grade 60) should be specified.
If vehicles do not have the possibility of access to the section, then wire fabric conforming to ASTM A185 may be used.
If wire fabric is allowed, proper specifications are required to ensure it is placed properly during concrete placement, and not left in contact with the ground.
Portland cement concrete (PCC) paving sections for main thoroughfares, including heavy trucks, buses, and heavy equipment require a minimum of 8-inches of ¾”-0” base rock and 8-inches of 4,000 psi concrete.
All concrete sections designed for vehicular traffic, requires reinforcing steel, and a 2-inch thicker concrete section within 12-inches of all edges.
Sidewalks, wheelchair ramps, driveways
All sidewalks, wheelchair ramps, and driveways shall be designed per latest City of Corvallis Standard Construction Specifications and associated detail drawings, with the following exceptions:
Minimum depth of base rock shall be 4-inches, rather than 2- inches.
All concrete shall have a minimum strength of 4,000 psi.
All sections of sidewalk to be used for vehicular parking, maintenance, and/or construction access, are required to be a minimum of 6 inches thick and reinforced per “PCC PAVING SECTIONS” in this Design Criteria.
The maximum cross slope for sidewalks and walkways shall be 1.5% (1:66.7). This is to ensure that, with construction tolerances, the resulting slope will be less than 2% (1:48).The specifications or drawings shall state that any walkways constructed with a cross slope exceeding 2% (1:48) shall be removed and replaced by the Contractor at the Contractor’s cost. Determinations of non-compliant slopes will be at the discretion of OSU, measured using a 2 foot digital level.
Cross slopes for ramps and landings shall also comply with (C.i.4.) above.
The use of exterior ramps should be avoided unless existing grades dictate a need for a ramp. If a ramp is deemed necessary, the maximum running slope on a ramp shall be 1:16 (6.25%).
Architects and Engineers shall use this OSU practice as initial design standard when designing ADA ramps for building entries.
When the use of the best practice standard is not technically feasible, then the most practical percent slope shall be used.
Any diversion from this best practice will need to be communicated and coordinated with the Office of Equity and Inclusion prior to a decision not to use the best practice standard.
Parking lot designs shall comply with the latest versions of the City of Corvallis “Off-Street Parking and Access Standards” and the Oregon Transportation Commission “Standards for Accessible Parking Spaces”, as applicable. The Consultant and/or Contractor are responsible for obtaining copies of these documents.
All new private (University owned) pavement markings and signage as part of a project shall be designed and installed in accordance with the Manual for Uniform Traffic Control Devices (MUTCD) and the local jurisdiction standards
Newly resurfaced access ways and streets shall utilize durable pavement markings. Pavement marking repairs shall match existing or better materials.
All striping and pavement marking details shall be per ODOT or the local jurisdiction standard details unless pre-approved by the OSU Project Manager.
Pavement marking and/or signage plans shall be required with any and all alterations in existing striping and signage layout. See OSU Construction Standard 10 14 00 for information about signage.
Pavement markings that are painted on parking lot or road surfaces shall be applied using:
Touchups and small applications can be made using Sherwin Williams SherLiner solvent based aerosol inverted spray cans.
Pavement markings for accessible parking spaces shall be painted with reflective pavement marking paint. The overall symbol size shall be minimum 3’6” x 3’6”, with a 4” white border. The size of the white symbol shall be minimum 2’6” tall by 2’0” wide. See Diagram 32 10 00A at the end of this section.
Thermal Pavement Markings
All new pavement markings in streets and access drives shall utilize thermoplastic type durable markings for all pavement marking symbols.
Thermal (melt down) pavement markings are supplied be either 3M or Flint Trading INC and are applied according to manufacturer’s specifications.