Widen the median of State Route 4 in both directions from east of Milano Way/Glacier Drive to east of SR 242. Outside widening of SR 4 will occur in both directions at Pacheco Boulevard and I-680. The widening structural section includes aggregate subbase, aggregate base, permeable material, CTB, and a combination of PCC, AC, HAM, RAC-G paving. Concrete barriers including Midwest Guardrail System, Double Thrie Beam barrier, terminal systems, and crash cushion will be constructed. A combination of inside and outside widening of five bridges and the replacement of Grayson Creek bridge along with raising SR 4 profile in both directions from just east of I-680 to construct grading, RAC, In addition, the Project proposes replacing Grayson Creek Bridge and raising the profile of SR 4 from east of I-680 to east of Grayson Creek to 900 feet east of the new Grayson Creek bridge. Retaining walls, sign structures, signing, striping, electrical lightings, drainage, hydromodifications, bioswales, and electrical work under the Caltrans 2015 Standard Specifications and Standard Plan are to be constructed.

General work Description: Plant establishment period under the Caltrans 2015 Standard Specifications and Standard Plans.

General work description: install roadside signs and variable message signs, install and modify traffic signals, remove and replace pavement markings and striping, and electrical work under the Caltrans 2010 Standard Specifications and Standard Plans.