UST Remediation LNAPL Multiphase System

Denver Metro Area, Colorado

A multi­phase extraction system was designed to address an extensive LNAPL plume spanning multiple off-site properties to dewater the upper low-permeability zone and allow product recovery and vapor extraction in the sand units where the NAPL was trapped. Based on extensive aquifer testing and site characterization, a system of six dual phase (liquid and vapor) wells were installed and piped to a treatment system with an oil/water separator for LNAPL removal and an air stripper for water treatment. A waste water discharge permit with continuous remote monitoring was approved by the local POTW. The system was effective in removing all mobile NAPL and reducing groundwater concentrations of petroleum hydrocarbons.

UST Remediation LNAPL Multi-Phase System