C&D LANDFILL - Construction/Demolition Landfill

A C&D landfill in Mobile, Ala. discovered that it had unknowingly accepted a mercury-bearing hazardous waste over a two-year period. The waste, Glass Syntactic Polyurethane (GSPU), is a hazardous material as classified by the US EPA Toxicity Leaching Characteristic Procedure (TCLP).

SESI supervised test pitting to determine the feasability of excavation and separation of hazardous waste from debris within the landfill. Following a settlement for funding, SESI prepared a plan detailing the excavation, screening and removal of the hazardous waste from the landfill. The plan was approved by the Alabama Department of Environmental Management and excavation, screening, and removal of waste occured from 2009 through 2010.

Depths of waste within the landfill exceeded 60 feet from land surface over a 25-acre portion of the landfill. Approximately 500,000 cubic yards of waste were screened and 400,000 pounds of GSPU waste was removed and underwent proper disposal at a hazardous waste facility.

A secondary benefit of the screening process allowed for the recycling of metal goods and concrete that were placed in the landfill prior to the benefits of recycling being known and the screening allowed for the recovery of layers of cover material that will be utilized for years to come. Overall, a gain of approximatley 25% of air space within the area of remediation was realized and added 3 to 5 years of disposal space.

COLISEUM BOULEVARD PLUME - 1200-Acre TCE Plume

Southern Earth Sciences, Inc. is providing sampling and consulting services for this 1200-acre site in north-central Montgomery containing Trichloroethylene (TCE) in the groundwater.

The Alabama Department of Transportation (ALDOT), under the direction of the Alabama Department of Environmental Management (ADEM), has conducted investigations throughout this area since 1999 when the TCE was discovered.

Groundwater monitoring wells were installed to establish a monitoring system in which samples are taken on a quarterly basis from various sites within the CBP and at various depths. Soil cores were obtained during well installations to viusally log the subsurface lithology.

SESI's involvement with the CBP includes collecting samples from a network of over 100 groundwater monitoring wells covering 1200 acres each quarter. At selected locations throughout the site, surface water and soil samples are also collected for analysis. Periodically, SESI conducts CPT testing and Geoprobe® investigations as well as managing installation of monitoring wells with sonic drilling.

TETRACHLOROETHYLENE (PCE) PLUME - Former Dry Cleaners

Southern Earth Sciences, Inc. utilized direct push technology to install injection wells within the plume of PCE that originated at a former dry cleaning facility.

Remedial activities included injection of microbial solution to enhance biological degredation and lower concentrations of chlorinated hydrocarbons below cleanup levels.

UNDERGROUND STORAGE TANK - UST Site

Southern Earth Sciences, Inc. performed a site assessment, designed and installed a dual phase extraction system to remediate a hydrocarbon plume.

Free product was removed, and dissolved phase concentrations below closure levels were achieved within twelve months of operation.

NPDES PERMIT - Sand and Gravel Pit

Southern Earth Sciences, Inc. provided services for National Pollutant Discharge Elimination System (NPDES) individual mining permit application.