m
m
Line 1: Line 1:
{{alert|This page and pages that link to this page are in development. We anticipate populating this page through spring, 2016.|alert-info}}
+
{{alert|This page and pages that link to this page are in development. We anticipate populating this page through 2016.|alert-info}}
  
 
[[file:Contaminated site 2.png|300px|thumb|alt=schematic of contaminated site|<font size=3>Schematic for site where infiltration is not feasible. Note impermeable liner and discharge from underdrain to storm sewer system. For a discussion of considerations at sites with on- or off-site contamination, see [[Overview of considerations for sites with on-site and off-site contamination|this page]].</font size>]]
 
[[file:Contaminated site 2.png|300px|thumb|alt=schematic of contaminated site|<font size=3>Schematic for site where infiltration is not feasible. Note impermeable liner and discharge from underdrain to storm sewer system. For a discussion of considerations at sites with on- or off-site contamination, see [[Overview of considerations for sites with on-site and off-site contamination|this page]].</font size>]]

Revision as of 12:39, 28 June 2016

Information: This page and pages that link to this page are in development. We anticipate populating this page through 2016.
schematic of contaminated site
Schematic for site where infiltration is not feasible. Note impermeable liner and discharge from underdrain to storm sewer system. For a discussion of considerations at sites with on- or off-site contamination, see this page.
schematic of contaminated soil
Schematic for site where infiltration is feasible. Note that contaminated soils are isolated and the groundwater mound does not extend into the contamination. Source:CDM Smith. For a discussion of considerations at sites with on- or off-site contamination, see this page.
Warning: The Construction Stormwater General permit prohibits the use of infiltration BMPs in areas where the infiltrating stormwater will mobilize contaminants.

Managing stormwater at sites with contaminated soils or groundwater is challenging because the infiltrated runoff has the potential to transport contaminants in the soil to the groundwater or mobilize contaminants in the groundwater. Stormwater at contaminated sites can be managed by surface capture and treatment, or as infiltration by avoiding contact between runoff and contaminated soils and groundwater. Surface capture includes filtration and sedimentation practices. When considering surface capture and treatment of runoff at contaminated sites, the surface capture treatment system will usually need an impermeable barrier to prevent infiltration and potential mobilization of contaminates in soil or groundwater. When considering stormwater infiltration at contaminated sites, it is essential to develop management options to ensure contaminants are not mobilized. To accomplish this, a project proposer must understand site conditions (e.g. soils, hydrogeology, land use), the nature and extent of contamination (i.e. site conceptual model), and applicable regulations. The following pages provide information on these topics, including case studies and links to additional information and guidance.



Related pages