Laserfiche WebLink
Summary <br />Design of a project to stabilize Lake Chabot Road between Chabot Terrace and Astor Drive. <br />Description <br />The ground beneath Lake Chabot Road between Chabot Terrace and Astor Drive (approximately 2100 linear feet) is <br />creeping downward toward the creek. Over many years, sections of the down slope side of this road have continually <br />depressed, causing material sloughing and creating longitudinal fissures in the roadway; additionally, storm water <br />runoff has caused various degrees of erosion to the down slope hillside. A 2011 geotechnical investigation study <br />determined that fill slope creep will continue and that new shallow landslides could be triggered by excessive <br />precipitation or ground shaking. Two repair options were suggested: 1. Stitch Pier Retention System, 2. Re-grading <br />the site with engineered fill properly keyed and benched into the bedrock. Additionally, improvements to surface <br />water control should be addressed to minimize erosion. The construction of the project will be at a future phase. <br />Justification or Benefit of Project <br />Chabot road carries approximately 3300 vehicles per day. Without preventative work this road will eventually fail and <br />these vehicles will be detoured through the Bay-O-Vista neighborhood. <br />Consequences of not doing the Project <br />Without this project the City will continue to fund road repairs as the hill side moves. If the slope fails and moves <br />suddenly down toward the creek, the costs to rebuild the road will be significantly higher than the cost to prevent <br />failure. <br />Project Numb 2009.0030Project Typ Roadway pavement <br />Detailed Cost $260,000 Status Funded CIP <br />Department/Sponsor Engineering & Transportatio <br />Impact to Operation Cost Neutral Impact to Maintenance Cost Neutral <br />Likely Cost <br />Categor Roadways for vehicles <br />Project Name Lake Chabot Road Stabilization Design <br />156