04 - Laserfiche WebLink

INTRODUCTION The California Department of Transportation (Caltrans) has approved a Mitigation Plan (MP) to meet Caltrans regulatory responsibilities under Public Resources Code §5024 as a state owned historical resource, CA-ALA-574, is present within the Project Area Limits (PAL) for the proposed I-680/Bernal Avenue Interchange improvement. The City of Pleasanton is funding the project as a California Environmental Quality Act (CEQA) development mitigation measure and is the CEQA Lead Agency. Caltrans is the CEQA responsible agency. PROJECT LOCATION AND DESCRIPTION The proposed project is located within the City of Pleasanton at the intersection of Bernal Avenue and 1-680 from post miles (PM) 16.5 and 17.0. The PAL includes the interchange plus public and private land west of the Bernal Avenue southbound on- and off- ramp. All work will be completed within the public right of way (ROW). The proposed project will widen Bernal Avenue and install traffic signal modifications to improve vehicular, bicycle, and pedestrian circulation within the State ROW at the Bernal Avenue/I-680 intersection. In addition, landscaping and limited signage are proposed within the on-ramp and within the southeast corner of the intersection of Bernal Road. CALTRANS APPROVED MITIGATION PLAN A three-part Mitigation Plan (MP) has been approved to mitigate adverse effects as the proposed construction may affect cultural deposits associated with CA-ALA-574 within the Caltrans ROW. The three-part MP consists of: • (1) a mechanically assisted Test Program within the proposed direct impact areas in the Caltrans ROW; • (2) a Data Recovery Program to direct the treatment of any significant cultural materials exposed during the testing program within the ROW; and, • (3) an Archaeological Monitoring Program during subsurface excavation within the Caltrans ROW to be disturbed during construction. CURRENT SCOPE - Test Program This scope covers the mechanically assisted Test Program. The other mitigation program components in the MP are dependent on the results obtained during the Test Program. TEST PROGRAM A review of the available archaeological site data suggests that prehistoric cultural deposits could be present within the proposed project footprint under varying depths of engineered fill ranging from 30 cm to 180 cm (1.0-6.0 feet) below the present grade. Scope and Cost Estimate-Archaeological Test Plan Encroachment Permit 0411-NMC0671 Mitigation Plan-CA-CA-ALA-574 June 2013 (Revised November 2013)