Common use of Viable Alternatives Clause in Contracts

Viable Alternatives. The project has two alternatives: One Build Alterative and the No-Build Alternative. This section focuses on the Build Alternative. The Build Alternative, the Programmable Project Alternative, will place 401 lights approximately 200 feet apart. See Attachment B for typical cross sections; see Attachment C for layouts. The project proposes to install light-emitting diode (LED) lighting to provide luminosity along the I-80 mainline within the project limits. Lighting Standard Type 32, a luminaire with one mast arm, will generally be placed near the outside shoulders. Lighting Standard Type 21D with double luminaire mast arm will be placed in the median where outside luminaire placement is not possible. The intervals between lighting will generally be about 200 feet. The project will install total of approximately 401 lights. Each light to be placed in the median will be supported by a 12-foot deep cast-in- drilled-hole (CIDH) pile in a Type 60G Barrier (Modified). The lights near the outside shoulder will have a foundation 8 feet in the ground, and the aboveground part will be breakaway. To provide wire connections to the proposed lighting, trenching will be done to depths of about 30 inches in the dirt areas, and jacking will be done more than 18 inches below the bottom of the pavement structural sections. As part of the project, the existing median concrete barriers will be removed and a new barrier will be installed from east of the overhead sign (Ala-80–PM R7.652) at the beginning of the project to CC-80–PM 10.0, just west of the I-80/SR 4 separation structure. The Type 60MG Concrete Barriers will be installed in the tangent sections to reduce glare from the opposite direction, and Type 60G (Modified) will provide support for the light poles. The Type 60M Concrete Barriers will be used for the curve sections due to horizontal sight distance requirements. On structure decks, Type 60A and Type 60GA are proposed to replace the existing concrete barriers. The existing slotted drains underneath the median concrete barrier may be damaged because of the barrier removal. New slotted drains may need to be installed to replace the ones that are damaged. The existing HOV signs will be replaced along with the barriers. Midwest guardrail system and other safety devices will be installed and upgraded at various locations. To install the lighting and upgrade the median barriers, traffic lanes in both directions will need to be shifted out from the mostly 6-foot wide median to provide construction space. Pavement recommendations call for cold-planing and resurfacing for the asphalt pavement and grinding for the concrete pavement before new stripes are placed for the restored traffic lanes. A Capital Preventive Maintenance (CAPM) pavement rehabilitation project was just completed in 2019 from CC-80–PM 0.0 to PM 9.8. The current project will cold-plane and replace the top 0.10-foot layer of open-graded pavement because of pavement scaring due to stage construction. See Attachment K for Materials Report.