Stage Construction. To ensure that traffic operations are not affected, detour and construction staging plans will be developed that will preserve or minimize the impact to the existing number of traffic lanes on I-680 in each direction throughout the construction period, except during critical short-term construction activities. Twenty-four-hour traffic counts will be performed to assess the impact of any needed lane closures. Preliminary information concerning lane closures will be used to develop feasible staging plans. Impacts to access for local business and private properties, will all be carefully considered in the staging plans. If nighttime closures are required, acceptable detours will need to be put in place. The details of how traffic will be handled during construction will be presented in the TMP. The lane closures will be done at night to keep traffic effects at a minimum. Public outreach will be performed ahead of time to ensure that closures will be announced in a timely manner. Temporary detours of existing interchange ramps may be necessary during construction. Most of the construction activity will be done behind temporary railing (type K) to keep lane closures and traffic disruption to a minimum. Project construction is based on the two major stages identified below. Several construction phases are associated with each construction stage. A conceptual stage construction plan has been developed (see Attachment I) to confirm Project constructability. The stage construction concept was presented to Caltrans Design Contra Costa on November 13, 2018, comments received have been incorporated. A construction sequence of the major construction activities of each stage is presented below. Refer to Attachment I for details. • Construct concrete barrier along I-680 median. • Construct overhead sign structure along I-680 median. • Construct CHP area along I-680 median. • Construct inside pavement widening for NB I-000 Xxxxxxx Xxxx. • Construct inside pavement widening for SB I-000 Xxxxxxx Xxxx. • Construct retaining wall No. 162 along I-680 median. • Construct retaining wall No. 213 along I-680 median. • Construct Midwest guardrail system along I-680 median. • Construct Maintenance Vehicle Pullout along SB I-680 right shoulder. • Construct concrete barrier along NB I-680 right shoulder. • Construct outside pavement widening along NB I-680 and retaining wall No. 180 and 424. • Construct outside pavement widening along SB I-680. • Construct retaining wall No. 153 along...
Stage Construction. Stage Construction plans will be developed in the PS&E (Plan, Scope and Estimate) phase. The preferred alternative will require additional stages of construction to shift traffic to the outside while constructing the Managed Lane Connector Ramp structure in the median at the I- 80/US 50 separation.
Stage Construction. Consultant: TRC
Stage Construction. Preliminary Stage Construction and Traffic Handling Plans are in Attachment L of this project. The stage construction includes utilizing Temporary Railing (Type K) and Temporary Traffic Screen in construction to separate traffic and construction activities. Long term closures are included in the stage construction plans to complete work on the ramps and transition areas. The staging will allow work to be completed on the existing pavement and not reduce the number of lanes during construction. The Stage 1 will include widening or reconstructing the median section of the roadway that will be utilized in the subsequent stages. Traffic will be shifted towards the median while work is completed on the existing pavement. The median pavement constructed for stage construction will remain in place when the project is complete but will not be striped to allow for traffic.
