Principal Hydrogeologist, Independent, Formally With Urs Corp
VOC CONTAMINATION OF SEDIMENTS DUE TO GROUNDWATER-SURFACE WATER INTERACTION – A CASE STUDY
Groundwater at a manufacturing site is contaminated with Chlorobenzene, 1,2- Dichlorbenzene, Aniline, 4-Chloroaniline, and other chemicals associated with dye manufacturing. These volatile organic compounds (VOCs) are also present in sediment of an adjacent freshwater canal because groundwater flows through the sediment. As a result, the dissolved VOCs partition to the organic-rich sediment.
As part of a study to assess sediment quality, several techniques were used to measure VOC and geochemical concentrations at various depths in the sediment. Pore water concentration profiles with centimeter-scale resolution were obtained using in-situ dialysis samplers ("peepers"). These data provide a line of evidence that natural, anaerobic degradation of VOCs is occurring in the sediment.