In the Heart of the City

A project that incorporated PSEC’s expertise with Urban Sites, and Difficult to Access Sites both, this basement required a 25 foot deep, 20,000 cubic yard excavation at a one-half acre site, completely surrounded by established businesses and development. The site, situated adjacent to two high-traffic streets near downtown San Francisco, required both complicated logistics for traffic management, and coordinating with, …

Dumbarton Quarry Facility Repurposing Adds Urban Park to East Bay Regional Parks System

In the continuing endeavor to complete the Dumbarton Quarry Closure and donation of the property to the City of Fremont, and the East Bay Regional Parks District, PSEC has begun the first-stage construction of the Recreational Vehicle camping area.  This next phase, which should be turned over to the City and the Regional Park authority at the end of 2017, …

Pt. Molate Remediation Project

The remediation project at IR Site Three, at the former Naval Fueling Depot at Point Molate, California, was successfully completed after a series of weather delays during the winter of 2015.  This project, which included a very technically complicated excavation, dewatering, and shoreline protection plan, was a project of note for the City of Richmond, California.  The cleanup is necessary …

Valley Fire Remediation

The Valley Wildfire, the second most costly firestorm in California history, destroyed some 1600 homes and other structures, many tens of thousands of acres of forest land, and did so in a terrain that was not only steep and unforgiving, but also remote and difficult to access.  PSEC, under contract with the State of California, was the primary contractor tasked …

Intercept Wall (TRC) Surrounds Closed Landfill in Antioch, CA

A closed landfill in Antioch, California, potentially had contaminates of concern migrating off-site and moving toward a residential neighborhood. SEC designed a methodology that utilized a pilot-study intercept wall, comprised of installing an impermeable barrier as deep as 120’ below grade. The trench necessitated a slurry support method, that allowed the trench to remain open until the appropriate depth was …