EXHIBIT A
SCOPE OF SERVICES
Project Description
Lake Chabot Road is a two-lane highway located along the southwestern slope of San Leandro Creek and immediately upslope of Lake Chabot Dam. It is classified as a Residential Collector, providing an alternate route to Castro Valley and access to the local Bay-O-Vista neighborhood. The roadway was constructed by cutting into the hillside upslope and filling on top of the hillside downslope. During the January 2023 storms two separate erosion slides occurred, namely site A and site B, making the roadway unsafe for vehicular traffic.
At site A, located 200 feet east of Chabot Terrace, approximately 80 linear feet of embankment below the road eroded and slid downhill undermining the pavement edge of the westbound lane. Repairs are anticipated to include construction of a drilled pier retaining structure on the downslope, backfill and repaving of the westbound lane.
Site B is located 1600 feet east of Chabot Terrace. This hillside area was previously bolstered with rock slope protection (RSP); however, in the recent storms, an approximate 100 linear foot section of upslope embankment slid, depositing debris and RSP onto the roadway below and exposing above dwellings to structural vulnerability. Repairs are anticipated to include construction of a retaining wall at the toe of the slope, re-grading of the upslope hillside, and reinstallation of salvaged and new RSP.
The intent is to repair the roadway to support vehicular traffic and return it to its pre-storm service condition. The design for site B has already been completed, this project is for the design of the improvements at site A.
Scope of Services
The Consultant shall complete the tasks as listed below.
Task 1 - Conceptual Design Alternatives
Provide two (2) conceptual design alternatives for the project at Site A. Each alternative shall include a conceptual cost estimate, a risk register and evaluation that follows the Caltrans standard format. The alternatives and their ranking in order of preference shall be presented to the City in a Design Alternatives Memorandum.
Task 2 - Design of Selected Alternative
A topographic survey, gathering of other data and record information, civil design of drainage improvements, and structural design of the concrete piers. Deliverables shall include plans and technical specifications suitable for permitting and construction and an engineer’s estimate of probable construction costs.
Submittals shall be made at 35%, 65%, and 100% completion. Submittals shall include PDF files, CAD files, Excel files, and Word files.
EXHIBIT B
B