COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

The 11th Street East Tracy Overhead Bridge Replacement Project consists of replacing the existing bridge with a shorter structure in combination with retaining walls and embankment fill at the approaches. The project extents are dictated by the vertical clearance requirements over UPRR ROW and the ability of the vertical profile to match the existing profile for the given design speed under AASHTO design requirements. The replacement structure will need to provide 23'-4" of permanent vertical clearance over the UPRR ROW. The replacement structure will be wider than the existing structure in order to accommodate AASHTO requirements for lane and shoulder widths. The typical section will consist of two 12-foot-wide through traffic lanes in each direction, 8-foot-wide shoulders which will serve as Class H bicycle lanes, and 8-foot wide separated sidewalks on each side that are protected with traffic side barriers. In addition to meeting AASHTO standards, this traffic configuration for the replacement structure is consistent with the City of Tracy's General Plan objective to achieve a comprehensive system of city-wide bikeways. The design will provide the most cost effective replacement alternative which will accommodate a future extension of MacArthur Drive. Although the final design of the MacArthur Drive extension is not part of this project, the final solution determined for the replacement of the existing 11th Street East Tracy Overhead Structure has to be able to accommodate the future extension. Overhead lines running parallel to 11th Street and adjacent to the existing bridge will have to be relocated. There are existing storm drain, gas, sewer, and water lines that may also need to be relocated. Fiber optic lines run parallel to the UPRR tracks. Conduits will be placed in the new bridge structure to accommodate any future utilities. Temporary construction easements will be required for construction staging areas to the north and south of 11 th Street; east of North MacArthur Drive and east of the UPRR tracks. Permanent ROW acquisition or slope easements will be required for the north side of both approach embankments to accommodate the toe of fill limits at these locations. The site investigation will be performed along the shoulders of 11 h Street and MacArthur Drive, adjacent to UPRR ROW, at private properties proposed for partial acquisition, and at the proposed soil borrow area. The project location is depicted on the Vicinity Map,Figure 1. PURPOSE The purpose of the proposed scope of services is to evaluate concentrations of metals, including aerially-deposited lead(ADL),petroleum hydrocarbon compounds,pesticides, and herbicides in soil at the project site and proposed borrow area. ADL may be present primarily due to historic leaded fuel emissions from automobile exhausts. Lead poses risks related to inhalation, ingestion, and dermal contact with the material. Petroleum hydrocarbon compounds and residual agricultural chemicals may be present at the project site due to current and historical uses. Groundwater may be encountered during construction activities; therefore, we will attempt to collect grab-groundwater samples during the investigation. The information obtained from this investigation will be used by the client to coordinate the construction project activities, and to evaluate soil reuse/disposal options and worker health and safety. Project No.E8504-06-01 -2- July 13,2011