PUBLIC INFRASTRUCTURE PROJECTS

The following is a representative list of the types of public projects MacKay & Somps has completed:

Hazel Avenue Reconstruction Project, Sacramento County

The Hazel Avenue project consisted of pavement reconstruction and widening of a one-mile stretch of this four lane major north-south arterial that connects Highway 50 to Interstate 80 in eastern Sacramento County. The scope of design services provided on this challenging project included design of roadway and pavement reconstruction improvements, water-line improvements and traffic striping and signing plans. MacKay & Somps also provided construction staking and construction administration services. A major challenge overcome during the design of this project was the development of construction phasing concepts to accommodate the heavy automobile and truck traffic that use this major transportation route.

Concord Trunk Sewer, City of Concord

This project included the design of 39,000 lineal feet of trunk sewers up to 54-inches in diameter through existing streets in the City of Concord. Major construction was accomplished while maintaining access to adjacent properties. Special design was used crossing fault areas. In addition to providing design services, MacKay & Somps served as resident engineer during construction and performed all contract administration.

Arroyo De La Laguna Flood Control Project, Pleasanton

This Zone 7 Water Agency project consisted of master planning the improvement of a major drainage channel that conveys up to 27,000 cfs from the Tri-Valley area of Pleasanton, Dublin, and Livermore. Our services included the development of several design alternatives, coordination with various regulatory agencies, the design and implementation of a public outreach program, and the estimation of project costs including right-of-way acquisition and riparian habitat restoration. The project also included the preparation of an EIR under the requirements of CEQA and NEPA. MacKay & Somps served as the lead consultant overseeing a team of 6 sub-consultants.

Crow Canyon Road Improvements, City of San Ramon

Our services consisted of planning and design of this $5 million roadway widening project for the City of San Ramon. The project included the development and design of Rule 20B utility underground, Caltrans ramp widening and PEER preparation, landscaping, pavement widening and overlay and five signal modifications.

Vasona LRT – Water-line Protection and Relocation Projects, San Jose

In coordination with Valley Transit Authority’s 4.5 mile Vasona Light Rail Transit extension, MacKay & Somps designed water improvements for the San Jose Water Company. Our services included preparations of plans, specification and estimate documents for the replacement of 6-inch to 36-inch water mains. We also coordinated utility relocations for numerous other agencies and provided oversight of construction inspection activities.

Salinas GPS and Base Mapping Project, Salinas

MacKay & Somps established a master GPS control base utilizing static GPS techniques. The project included base mapping of the 46,000 acre city-wide area and locating approximately 800 storm water manholes utilizing RTK GPS techniques.

Lower Silver Creek Reaches 1 & 2, San Jose

MacKay & Somps services included engineering investigations, design and preparation of PS&E package for rehabilitation of a one-mile reach of this urban stream corridor for the Santa Clara Valley Water District. MacKay & Somps also provided construction administration and staking services. This $15 million improvement project included the use of a wide-range of environmentally friendly enhancements for the multi-staged open channel, fisheries and native vegetation. Engineering issues included extensive HEC-RAS analysis, slope stability and hazardous materials evaluations. The creek crosses Highway 101 and new bridge and channel improvements had to be tied into the existing Caltrans bridge. The project involved encroachment permits from Caltrans and the City of San Jose as well as a right of engineering permit from UPRR.

Mountain House - Specific Plan III and EIR Support, San Joaquin County

MacKay & Somps provided planning and engineering support to San Joaquin County’s lead consultant, EDAW for the preparation of a Specific Plan and Environmental Impact Report. MacKay & Somps’ services included assisting in the land planning process for this complex process of re-formulating land uses and technical studies to fit within general Plan and Master Plan requirements. Roadway alignments, utility demand / pipe sizing and drainage conveyance systems all had to be addressed due to the addition of a new community college campus that was not part of the original master plan.

H.W. Kolb Elementary School

On this assignment for Dublin Unified School District, MacKay and Somps assisted the project architect with the school site layout. We then prepared final engineering for site grading and on-site infrastructure improvements. We also assisted with processing for approval through the Department of State Architect and then provided construction consultation and construction staking services. Fitting standardized, pre-designed buildings on a steep site caused significant grading design challenges and complicated the requirement for providing ADA compliant “accessible routes” to all buildings. Our efforts and attention to detail enabled us to help the school district achieve substantial cost savings and considerable time savings in the DSA approval process.