Terraphase is the environmental engineering consultant to the City of Richmond in Northern California for the remediation and redevelopment of the former Naval Fuel Depot Point Molate. The Navy formerly operated a waste oil pond (oil from ship bilges, off-specification fuels, waste oil) at the 12-acre Installation Restoration Site 3 (IR Site 3). Operation of the waste oil pond resulted in extensive petroleum impacts, primarily Bunker C and diesel fuel, to the soil and groundwater across most of the Site.

Scope of Services

Terraphase prepared the design of the remedial solution for the site and oversaw execution of the remedial action which would allow for redevelopment of the property. Terraphase services at the site included pre-characterization, for waste-disposal purposes, of the 12-acre IR Site 3. The characterization consisted of advancing over 100 borings and developing a novel approach to assess mobility of petroleum products in the subsurface. The remedial excavation removed over 200,000 tons of soil, and Terraphase oversaw final grading and drainage of the site. Our services during construction included stormwater compliance, air monitoring, and operation, maintenance, and monitoring of a 100-gallon per minute groundwater treatment plant. The treatment plan had an associated groundwater barrier and non-aqueous phase liquid (NAPL) removal component. Terraphase was responsible for National Pollutant Discharge Elimination System (NPDES) compliance reporting for the groundwater treatment system. Following the remedial excavation, our team collected over 500 confirmation samples. Additionally, we screened over 200,000 tons of import soil from multiple sites around the San Francisco Bay Area based upon strict acceptance criteria. Terraphase participated in regular meetings with the Point Molate Community Advisory Committee as part of this remediation effort.

Notable Accomplishments

• Prepared the design documentation and provided oversight of a $13.5 million removal action for petroleum-contaminated soil along the waterfront
• Oversaw excavation of over 200,000 tons of petroleum-impacted soil and screened all import soil incoming to the site