Other Recent Additions
Posted: October 20, 2016
These Brownfields grants may be used to address sites contaminated by petroleum and hazardous substances, pollutants, or contaminants (including hazardous substances co-mingled with petroleum). Assessment grants are funded over three years. Applicants may apply for up to $200,000 in hazardous substances funding or up to $200,000 in petroleum funding. Community-wide Applicants applying for both hazardous substances funding and petroleum funding may request a combined total up to $300,000. Assessment Coalition Applicants may apply for up to $600,000 in hazardous substances funding and/or petroleum funding. Cleanup Grants are funded over three years. Applicants can apply for up to $200,000 per brownfield site and can submit up to three separate, site-specific cleanup proposals. The proposal submission deadline is December 20, 2016.
Posted: October 10, 2016
The Saunders Supply Company Superfund Site is located in Suffolk County, Virginia, in EPA Region 3, and is a 7-1/3 acre former wood treating plant. The source areas included wastewater ponds, treatment areas, and burn pits located on the Saunders property and were remediated by removing liquids and contaminated soil. Primary contaminants are currently pentachlorophenol (PCP), arsenic, and chromium in groundwater. The site is in the operation and maintenance (O&M) phase and uses a groundwater pump and treat (P&T) system to control migration of the contaminants and remove contaminant mass from the aquifer. An optimization review team was assembled and met with regulatory stakeholders and consultants at the site to observe site conditions, review site data and remediation goals, and discuss the technical aspects of the existing remedy and its performance toward achieving remediation goals. This report summarizes the findings and recommendations of the optimization review team.
Posted: October 4, 2016
When a residual petroleum smear zone was revealed upon cessation of pump and treat at the Shore Medical Center, Chestertown, Maryland, the Maryland Department of Environment permitted a pilot test of the Ivey-Sol® push-pull surfactant flushing technology in July/August 2014. The success of the pilot led to approval for full-scale use of the technology in August 2015. By the 27th week of successful implementation (March 2016), the site team recommended system closeout. This report details the remediation activities and results. Reports for the Chester River Hospital Center are posted under the Kent County heading at
Posted: September 20, 2016
Propane gas and oxygen were added to groundwater via sparging to stimulate native microbes to biodegrade NDMA in situ at the Aerojet Superfund site in Rancho Cordova, Calif. Groundwater NDMA concentrations at the test site ranged from ~2,000 to >30,000 ng/L. The biosparging system was operated for a period of 374 days, and full rounds of sampling were conducted on 12 occasions. Data from this field test indicate that propane biosparging can be an effective approach to reduce the concentrations of NDMA in a groundwater aquifer by 3 to 4 orders of magnitude, and that concentrations in the low ng/L range can be achieved with continuous treatment. The groundwater in this region currently is captured by a groundwater extraction and treatment system, and NDMA is removed by UV irradiation. Based on a cost analysis for treatment of a shallow groundwater plume (~10-40 ft bgs) ~400 ft in width, a propane biosparge barrier was estimated to be more cost-effective for NDMA removal than pump and treat with either UV or a fluidized bed bioreactor.
Posted: September 20, 2016
In lab experiments performed to determine the coupled effects of hydrodynamics, bioturbation, and biogeochemical processes on the transformation, mobility, bioavailability, and toxicity of metals in contaminated sediments, oxidation of surficial sediments liberated metal species that were then mobilized to both porewater and overlying water. Liberation of metals generally increased with hydrodynamic shear on the sediment-water interface, even in some low-permeability sediments. Sediment resuspension transitorily mobilized particulate metals but did not significantly mobilize dissolved metals or increase contaminant bioavailability or toxicity. Bioturbation and bioirrigation by burrowing worms, however, greatly increased sediment heterogeneity, oxygen delivery into sediments, and efflux of metals to both porewater and overlying water. Bioturbation also destabilized sediments, resulting in greater particle resuspension and metals efflux following flow perturbations. Based on these findings, the authors recommend including measurements of the effects of flow forcing and sediment resuspension in concert with biological perturbations during assessments of metals bioavailability and toxicity in contaminated sediments.