Water Quality Risk Assessment from Roadway Substructures Employing Fly Ash

Field water quality data collected from roadway substructures constructed with fly ash was assessed for any potential risk of groundwater and surface water trace element contamination. Trace element concentrations constituting the water quality data were compared to federal and state drinking and surface water quality limits. Elements requiring further evaluation were assessed indirectly to conservatively assess predicted field concentrations at a point of compliance (i.e., edge of right-of-way). Overall, the use of fly ash stabilization and fly ash fill in roadway applications described in this study do not impact groundwater and surface water quality making these beneficial reuse applications suitable with respect to trace element leaching based on obtained water quality data. Water quality data used in this study spans seven locations in four states, three substructure applications (subgrade stabilization, base stabilization, and fly ash fill), 18 monitoring points, and many years of monitoring (some more than a decade). These applications are indicated to be low risk and should not be prohibited by future regulations regarding the beneficial reuse of fly ash.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 998-1009
  • Monograph Title: Geo-Chicago 2016: Sustainable Geoenvironmental Systems

Subject/Index Terms

Filing Info

  • Accession Number: 01611075
  • Record Type: Publication
  • ISBN: 9780784480144
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:11PM