Terraphase has undertaken a comprehensive, multi-year environmental investigation at a former agricultural chemical distribution facility in Southern California. Site contamination linked to historical operations was first assessed in the late 1980s. Since then, the investigation has evolved significantly through multiple phases conducted by Terraphase, resulting in identifying residual contaminant sources critical to informing the design of appropriate remedial strategies.
Scope of Services
To date, Terraphase has advanced over 50 soil borings, installed 27 dual-nested soil-vapor probes, collected over 50 grab groundwater samples, installed sub-slab soil-vapor probes, and conducted indoor air sampling. These activities focused on characterizing impacts from 1,2-dichloropropane (1,2-DCP), 1,3-dichloropropene (1,3-DCP), ethylene dibromide (EDB or 1,2-DBA), methyl bromide, and 1,2,3-trichloropropane (1,2,3-TCP).
Notable Accomplishments
- Multi-media investigation of agricultural-related chemicals of concern at a legacy site, particularly 1,2,3-TCP, which has a California’s maximum contaminant level in groundwater of 5 parts per trillion
- Characterized new, formerly unknown, residual source areas to inform remedial design and implementation
