Remediation of a coastal 90-acre oil field waste disposal facility containing chlorin- ated solvents, TPH, PCBs, and dioxins occurring in drilling mud and site soils and groundwater facilitates development of 300 homes and a wildlife preserve. The wildlife preserve protects a previously believed extinct plant species. This insured remediation project, conducted under scrutiny from the DTSC, EPA, RWQCB, APCD, U.S. Fish and Wildlife, CA Department of Fish and Game, CA Coastal Commission, and local agen- cies, integrated development needs with remediation of soil vapor, soil, and groundwater using a broad variety of characterization and remedial technologies. Characterization techniques included typical soil and groundwater sampling, real time field screening, MIPs, fate and transport evaluations, and risk assessment. Remedial technologies included mass grading (to address both geotechnical and remedial hazards) with soil consolidation and capping, limited off-site disposal, NAPL dewatering and excavation, pump and treat of affected groundwater, ex-situ soil vapor extraction, zero valent iron and biological vertical reductive transport barrier creation, hydraulic barrier creation, and contingent residential vapor barriers. While the overall regulatory process spanned approximately 15 years to address coastal development and endangered species mitiga- tion, intensive remedial characterization began in 2003, with remedial activities sched- uled for completion in October, 2007. Residential development will commence in 2008, with dune habitat establishment to also be completed in 2008.
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