Morning Canyon Road Reconstruction Project
OE provided design engineering, construction management, and inspection services to the City of Diamond Bar on the Morning Canyon Road Reconstruction Project. Morning Canyon Road is a two-lane residential road beginning at Diamond Bar Boulevard and ending with a cul-de-sac nearly 4,000 feet to the northwest. The design phase included preparing construction plans, specifications and estimates to repair Morning Canyon from Diamond Bar Boulevard to Stonepine Drive approx. 950 ft. due to excessive roadway damage caused by tree root intrusion. The initial scope of work entailed removing 16 large pine trees that were causing extensive root intrusion into the roadway section; PCC work included 1,637 SF of sidewalk, 120 LF of curb and gutter, new ADA access ramps, striping/pavement markings, and the reconstruction of a Los Angeles County Public Works (LACPW) maintained catch basin located at the Southwest corner of Diamond Bar Boulevard and Morning Canyon Road. However, after a community meeting to inform the public about the project, the residents requested the staff explore an alternative approach in an effort to preserve the mature existing trees. After exploring some new options, the new scope of work entailed realigning the curb and moving it 8 feet closer to the roadway centerline, resulting in the elimination of the existing parking lane, and preserving the existing trees. Furthermore, the new design included relocating the sidewalk to the new back of curb alignment, resulting in a wider prakway area being backfilled with Class A Top Soil and topped with 2 inches of mulch. Three (3) new LACPW catch basins were required to be constructed, one at the beginning of the curb re-alignment, across from Stonepine Drive, the other on the south side of Presado Drive and the third at the end of the curb return alignment before Diamond Bar Boulevard. The fourth catch basin located at Canyon Park Drive and Morning Canyon Road was abandoned to preserve a tree across from Canyon Park Drive. Furthermore, work included localized dig outs for specific areas affected by the tree roots with a uniform grind and asphalt overlay, and preparing striping and signage plans to encompass parking and no parking areas.