TECHNICAL IMPRACTICABILITY DETERMINATION
Langan has conducted a comprehensive multi-media investigation at this former industrial facility in New Jersey. The investigation revealed widespread volatile organic contamination in the groundwater, and soils contaminated with heavy metals and cyanide. Several distinct contaminant plumes were identified and characterized in the unconsolidated deposits and bedrock beneath this site. Remediation of shallow aromatic contaminant plumes and dissolved chlorinated hydrocarbons have been addressed primarily by source removal and control. Natural degradation processes have been effective at reducing residual levels of the aromatic compounds. The occurrence of Dense Non-Aqueous Phase Liquid (DNAPL) migrating along the top of the bedrock surface was investigated to determine the extent and potential extent of migration. Based on the results of the investigation, Langan developed and executed a pilot testing program consisting of In-Situ Chemical Oxidation and Air Sparging/Soil Vapor Extraction technologies. The regulatory compliance strategy incorporates requirements of the USEPA Technical Impracticability Evaluation Guidance and NJDEP Classification Exception Area policy.