An indication of acoustical feasibility Number of benefited residences The total reasonableness allowance and engineer’s cost estimate for the abatement The total reasonableness allowance and engineer’s cost estimate for each barrier and barrier height evaluated (if a barrier is evaluated) Comparison of cost versus allowance If known, preliminary information on secondary effects of abatement such as impacts on cultural resources, scenic views, local biology or hazardous material A summary table may be used, see Figure K-1 for example. The engineer’s cost estimate should include costs required to construct the abatement. For noise barriers, include the cost of the wall or berm, footings, traffic control, drainage, modified or additional plantings, miscellaneous items, and a 10% contingency. Any items required to construct the wall should be included. For example, if a retaining wall is required to construct the wall, but not for the project itself, the cost of the retaining wall should be included; if a wall is constructed on a bridge, the cost of modifying the bridge structure to accommodate the wall should be included. Costs to bring roadways to current design standards, such as shoulder widening should not be included. Costs associated with the mitigation of secondary effects of the abatement should not be included in the abatement construction cost estimate. Examples include costs for mitigation, such as: Mitigation of visual effects, such as planting of vines or use of see-through wall materials Mitigation of effects related to hazardous materials (such as removal of materials) Mitigation of effects on cultural resources (such as removal of buried artifacts) Mitigation of effects on biological resources (such as replacement of endangered plant species or wildlife habitat) Wall construction cost should be based on masonry construction, in accordance with Caltrans’ standard specifications. If the construction cost is higher than the allowance, alternative construction methods should be evaluated and discussed.
An indication of acoustical feasibility Number of benefited residences The total reasonableness allowance and engineer’s cost estimate for the abatement The total reasonableness allowance and engineer’s cost estimate for each barrier and barrier height evaluated (if a barrier is evaluated) Comparison of cost versus allowance If known, preliminary information on secondary effects of abatement such as impacts on cultural resources, scenic views, local biology or hazardous material A summary table may be used, see Figure K-1 for example. The engineer’s cost estimate should include costs required to construct the abatement. For noise barriers, include the cost of the wall or berm, footings, traffic control, drainage, modified or additional plantings, miscellaneous items, and a 10% contingency. Any items required to construct the wall should be included. For example, if a retaining wall is required to construct the wall, but not for the project itself, the cost of the retaining wall should be included; if a wall is constructed on a bridge, the cost of modifying the bridge structure to accommodate the wall should be included. Costs to bring roadways to current design standards, such as shoulder widening should not be included. Costs associated with the mitigation of secondary effects of the abatement should not be included in the abatement construction cost estimate. Examples include costs for mitigation, such as: Mitigation of visual effects, such as planting of vines or use of see-through wall materials Mitigation of effects related to hazardous materials (such as removal of materials) Mitigation of effects on cultural resources (such as removal of buried artifacts) Mitigation of effects on biological resources (such as replacement of endangered plant species or wildlife habitat) Wall construction cost should be based on masonry construction, in accordance with Caltrans’ standard specifications. If the construction cost is higher than the allowance, alternative construction methods should be evaluated and discussed.
apdxk-23Sept2016L.docx