Nelson Lane Widening and Bridge Replacement – Lincoln, CA

This project stretched along approximately 0.7 miles of Nelson Lane, between Nicolaus Road to the north and State Route 65 to the south. Construction included the replacement of a functionally obsolete, narrow, two-lane bridge on Nelson Lane with two, two-lane bridges, one comprised of pre-cast girders and the other a cast-in-place, to accommodate projected traffic demands and to meet safety standards. This project was awarded the 2014 Small Project of the Year Award by the Sacramento Chapter of the American Society of Civil Engineers (ASCE). It also earned the 2014 Transportation (Structures) Project of the Year Award from the Sacramento Chapter of the American Public Works Association (APWA).

During construction, excessively wet and unstable subgrade soils were encountered that threatened to delay the construction and have detrimental effects on the project’s critical path schedule. H&K, working in coordination with the contractor, construction management firm, and the City of Lincoln, investigated the unstable soils and helped to develop alternatives to the removal and replacement methods so commonly employed. The alternative methods resulted in construction continuing without delay and without the additional expenses of removing and replacing the unstable subgrade.

As part of the $5.3 million project, H&K provided Quality Assurance (QA) services and materials sampling and testing in accordance with Caltrans Standards. Specific services included density testing of fill material during placement; density testing during lime treatment of subgrade; field sampling and testing of aggregate baserock to confirm compliance with project specifications; field sampling and laboratory testing of concrete during construction of cast-in-drilled-hole (CIDH) piers; field sampling and laboratory testing of concrete for the bridge girders, bridge deck, and bridge abutments; field sampling and laboratory testing of the hot mix asphalt (HMA); and field testing of grout during prestressing of bridge tendons.