Colton Crossing

Project Summary

This project included a grade separation of the UPRR tracks over the existing BNSF tracks.  The purpose of the grade separation is to eliminate a bottleneck in the regional rail network that exists where these two heavily traveled rail lines intersect.  San Bernardino Associated Governments (SANBAG) and the California Department of Transportation (Caltrans), with input from the Federal Rail Administration (FRA), BNSF, UPRR, and the City of Colton, constructed the grade separation between the UPRR and BNSF mainline tracks at the Colton Crossing.  The project included grade separation of the mainline tracks and modification, relocation, and/or construction of existing and/or new embankments, retaining structures, bridges, tracks, rail devices, and other features.

CHJ’s Role

CHJ provided the geotechnical investigation and environmental services during the design and preconstruction phases of the Colton Crossing Grade Separation.  The geotechnical scope of work included performing a geotechnical/geologic investigation that addressed seismicity, embankment construction and settlement, shallow foundation design and pile design.  The environmental scope included conducting a Phase I Site Assessment as well as representative soil sampling.  The purpose of the site assessment was to identify areas of concern due to hazardous materials and/or soil contamination during project construction.  CHJ’s responsibilities included field exploration for the project, consisting of 10 exploratory borings and 10 cone penetration test (CPT) soundings, laboratory testing, as well as 10 Geoprobe borings and analytical testing of soil samples.