Section 00236, which is not a Standard Specification, is included in this Project by Special Provision.
Description
00236.00 Scope - This work consists of designing, installing, maintaining, and removing temporary work access for the Contractor's use at sites specified in the plans. Temporary work access facilities include but are not limited to: temporary access roads, work areas, staging areas, stockpile sites, and specifically temporary construction elements that alter the slope and/or induce loads.
00236.01 Definitions -
Mitigation Measures - Design elements necessary to maintain slope stability, prevent slope instability and landslides, control erosion, provide and control temporary surface/subsurface drainage for all temporary construction elements.
Staging Area – An area within the project limits where equipment and vehicles are parked or stored when they are not in use.
Stockpile Site – A site within the project limits where material is placed prior to installation.
Temporary Access Road - A temporary road to provide access to areas within the project limits where construction activities are to take place.
Work Area – A place within the project limits that has been altered for equipment to be positioned and perform work.
00236.02 Permits – Obtain any necessary City of Portland permits to occupy the project through the City’s Right-of-Way. Comply with Section 00170.02 and 00170.03.
00236.03 Geotechnical Reports - Geotechnical reports with subsurface information are available from the Engineer.
Materials
00236.10 General - Provide materials according to the Oregon Standard Specifications for Construction.
Base Aggregate
Subgrade Geotextile
Chain Link Fabric
Temporary Fencing
Temporary Shoring
Excavation, Stockpiling and Embankment
Geotextile Fabric
Crane Mats
Scaffolding
Bridge Work Platforms
Moving Temporary Barrier
Cribbing
Temporary Illumination Equipment
00236.11 Submittals - The Contractor shall submit stamped shop drawings detailing the work platforms, scaffolding, temporary shoring and moving barrier to the Engineer for review and approval in accordance with the Section 00150.35.
Submit stamped working drawings and designs calculations according to 00150.35 for all temporary construction elements. The Engineer will approve or reject the submittal within 21 calendar days of receipt. Promptly submit any additional information or revised plan sheets. Allow 21 calendar days for the Engineer to approve and return any additional information or revised plan sheets.
All approvals given by the Engineer will be subject to trial in the field and will not relieve the Contractor of the responsibility to satisfactorily complete the work. Submit requests for modification of adopted procedures to the Engineer. Allow 21 calendar days for approval of modifications.
Do not begin construction, modifications, or restoration of temporary construction elements until the submittals have been approved by the Engineer.
Temporary Construction Element Plan shall include:
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Written narrative - describes temporary construction elements that will be constructed within the project limits; equipment and its placement; areas needed for movement and staging of equipment and vehicles, materials, construction activities, and the time period that the temporary construction element plan will be in effect.
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Working drawings - 11" x 17" size drawings shall be provided. Drawings shall include but not limited to:
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General notes - necessary information for design and construction including testing, materials, material properties and mitigation measures.
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Plan view - horizontal geometry of the proposed temporary construction element(s). This includes any additional design features, mitigation measures, and/or structures which would affect performance of the temporary construction element(s) as well as any information for construction.
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Profile – vertical geometry showing cuts and fills as well as any information on construction of the temporary construction elements and any mitigation measures.
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Typical Sections – detailing of surfacing, width, stationing of cut slopes, fill, erosion measures, slope stabilization, materials, and control of surface/subsurface drainage.
3) Slope Stability Analyses - Provide slope stability analyses in critical areas such as landslides or landslide terrain, and steep slopes near structures or roadways. Slope stability analysis shall include all features including but not limited to cut slopes, equipment loads, fills, shallow subsurface water conditions, and structures that reduce slope stability. Provide mitigations for slope instability related to construction and/or use of temporary construction elements and all other alterations of the ground surface. Earthwork is not allowed which would reduce the global stability of any existing landslide. The minimum acceptable Factor of Safety is 1.35 for the stability of any cut or fill planned for temporary construction elements. Show all loading, stockpiling, and which are applicable in design analyses.
Temporary Construction Element Restoration Plan – Provide designs and details for removing temporary construction elements such as access roads, work areas, staging areas, and stockpiles sites. Designs shall include but not be limited to items such as: permanent erosion control, mitigation measures, surface runoff, and drainage. This submittal shall be provided 30 days prior to the expiration of the most current and approved Temporary Construction Element Plan. This plan will not have a net increase of permanent loading from what exists prior to the start of construction.
Should working conditions differ in the field or time periods change, the Contractor shall provide another submittal for approval reflecting the actual conditions/time at no additional cost to the Agency.
Construction
00236.40 Construction - Submit temporary work access plans and written narrative 30 days in advance of occupying each temporary work access site. Contractor will be responsible to obtain all permissions and or permits outside of the work areas show. Work area access plans will be subject to requirements of Section 00150.35. Use existing roadways and travel paths whenever practical unless construction of a new access road would result in less impact.
No temporary access road may be built in a Restricted Work Area unless the area containing the access is first isolated from the active flowing stream.
00236.41 General - Place temporary work access roads on undisturbed ground. Do not grub areas under access roads. Lay chain link fabric directly on the ground. Place embankment geotextile and aggregate prior to operating vehicles or equipment in the area.
00236.42 Removal - Completely remove the temporary work access materials and the temporary crossing when no longer needed. Perform removal of access to the satisfaction of the Engineer and in compliance with applicable requirements. After removal, stabilize the soil and revegetate the site according to Section 01030.
00236.43 Temporary Construction Element Construction and Restoration – Construct and restore temporary construction elements within the limits approved by the Engineer. Cuts, fills, loading, drainage, and stockpiling may adversely affect the stability of existing site slopes. Provide mitigations for slope instability related to construction of the temporary construction element(s).
00236.49 Performance - Construct and restore temporary construction elements according to the approved plans. Do not deviate from the approved plans.
Measurement
00236.80 Measurement - No measurement of quantities will be made for this work.
Payment
00236.90 Payment - The accepted quantities of the work of this Section will paid for at the Contract lump sum amount for the items "Temporary Work Access Site __".
The site identifier will be inserted in the blank.
Payment will be payment in full for designing, constructing, maintaining, and removing temporary work access facilities including furnishing and placing all materials, and for furnishing all equipment, labor, and incidentals necessary to complete the work as specified.
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