Arbor House at the US National Arboretum

Washington, D.C.

Client: United States Department of Agriculture

Contract Value: $299,851

Expertise Highlights & Project Features: Walkways; Pathways; Remodeling; Hardscaping; Paving; Drainage and Irrigation Systems; Grading; Landscaping

As the prime contractor, Westerly rehabilitated and replaced the patio and walkways at the National Arboretum (412 acres). The work included drainage systems, irrigation systems, and landscaping. The work commenced with a construction survey and layout for the patios and walkways including shooting existing grades and recording elevations; measuring and recording existing dimensions for pavers, stoops, steps, asphalt and inlets; staking out elevations for drainage system and paver installations; locating existing irrigation main lines, lateral lines, irrigation heads, wires, and valve boxes.

Westerly removed and disposed of existing pavers, subgraded to a depth of 8” to allow for new stone base and pavers, existing edging, existing plants, and pea gravel areas. We saw cut, removed and disposed of existing asphalt. We also performed water meter installation and tested the irrigation system to ensure functionality for service to the National Arboretum. Our skilled team performed the grading of bed areas at the building perimeter to provide a minimum of 2% slope away from the building and installed new concrete pavers, 4” compacted stone base (CR-6) and 1” sand setting bed. We also installed new positive gravity drainage systems to collect downspouts, A/C condensate line and surface drains, lateral drain lines and trunk lines.