SR 75/282 Subsurface Exploration Begins for SR 75/282 Transportation Corridor Project

Date of Record: 2004-07-28
Subsurface Exploration Begins for SR 75/282 Transportation Corridor Project
City, Caltrans analyze soil composition, fault line for proposed traffic solutions
Coronado, CA (July 28, 2004) - As part of the SR 75/282 Transportation Corridor Project to evaluate proposed long-term traffic solutions in Coronado, the City will conduct a series of subsurface explorations along Fourth Street. The explorations will begin in mid-to-late August and continue for a period of three-to-four weeks.

The subsurface exploration program will consist of 21 borings that will test the composition of soil, water and geological formations. A similar study was conducted in 1999 during the City's Pre-Design Study, the first phase of this overall project. Results from the most current boring tests will be combined with past data to provide the City with the information it needs to make an informed decision about a long-term traffic solution.

At the same time, a geophysical assessment survey will be performed along Fourth Street, between A Avenue and the alleyway between Pomona Avenue and Glorietta Boulevard. The purpose of this test is to determine the approximate location of the Coronado fault. The survey will not produce ground vibrations that can be felt by humans. Noise from a small gas generator, used to power the equipment, will be mitigated by a noise-dampening curtain.

"In order to minimize inconveniences for residents and those traveling to work, the City has selected less congested areas along the Fourth Street corridor, such as alleys, side streets and medians, for the majority of the testing," said Gail Brydges, Project Manager of the SR 75/282 Transportation Corridor Project. "Results from these tests will provide project engineers with crucial data that will help plan for and design a project that improves the quality of life in Coronado."

Some work may involve the temporary restriction of parking and the temporary closing of a traffic lane in one direction, in or near the work zones. Access from Fourth Street onto side streets and alleys while work is being performed may also be restricted, but access from Third and Fifth Streets will remain open and available for use.

Most subsurface exploration will take place during the hours of 8 a.m. to 5 p.m., Monday through Friday. The geophysical assessment will be conducted between the hours of 10 p.m. and 6 a.m. for a one-to-two day period. The sensitivity of the recording equipment requires this test be conducted during the quietest period possible along the project corridor.

The City is committed to developing a long-term traffic solution that will help restore and maintain the unique residential and business-friendly atmosphere in Coronado. Through the proposed SR 75/282 Transportation Corridor Project, the City is evaluating six traffic congestion relief alternatives identified during the Pre-Design Study.