The Department of Toxic Substances Control (DTSC) approved the Eco Cleaners (Site) Removal Action Workplan (RAW) located at 4200 Chino Hills Parkway, Chino Hills. The cleanup decision document, referred to as a RAW, specified the removal action objectives, identified the contaminants of concerns (COCs), and evaluated alternative remediation proposed for the Site.
The COCs at the Site consist of chlorinated volatile organic compounds (VOCs), principally tetrachloroethylene (PCE) and trichloroethylene (TCE), which are the only two VOCs detected in soil vapor that have exceeded their respective risk-based screening levels.
The Project activities consist of the following:
- Install four nested SVE wells with screens at two depths—one from approximately 5 to 20 feet below ground surface, and one from approximately 23 to 38 feet below ground surface.
- Collect baseline (pre-SVE) soil-vapor samples for laboratory analysis from all soil-vapor and sub-slab soil-vapor probes.
- Collect air flow and pressure data under different SVE well operating configurations to evaluate ow vacuum propagates in the two primary, unsaturated soil zones corresponding to the SVE well screen depths; how extraction flow rates correspond to applied SVE well head vacuum in the two primary, unsaturated soil zones corresponding to the SVE well screen depths and appropriate SVE well spacing based on vacuum propagation analysis (generally referred to as
radius of influence) and pore-gas velocity analysis.
-Should SVE be effective, continue operation of the SVE system for 6 to 9 months and monitor system parameters in accordance with South Coast Air Quality Management District requirements.
- Collect VOC concentration data in extracted soil vapor to estimate VOC mass removal rates.
- Evaluate how soil-vapor concentrations change over time (rebound) when SVE is terminated.