Remediation of Tetrachloroethylene
contaminated Soil and Groundwater
Work Description
– General:
Chase Environmental Group
was contracted for the investigation and remediation of
Soil and Groundwater at a dry cleaning facility. A groundwater
assessment identified extensive subsurface Tetrachloroethylene
contamination in an area immediately adjacent to the dry
cleaning areas.
The Corrective Action Plan was implemented in two stages:
R’Place
Pub - Remediation of
Soil and Groundwater at a dry
cleaning facility
Stage 1 VAMPIRE™ Remediation
Vacuum Assisted Multi-Phase Remediation Extraction (VAMPIRE®)
is an innovative and cost effective remediation method that
utilizes high vacuum pressures and flow rates to remove
multiple phase (i.e. vapor, adsorbed, dissolved, and free
phase) VOCs. VAMPIRE® simultaneously removes VOCs from both
the vadose and saturated zones.
The VAMPIRE™ was used to remove the high concentrations
of TCE prior to the injection of HRC.
Three 8-hour VAMPIRE™ events were performed resulting in
the removal of 27 lbs of chlorinated compounds.
Stage 2 Hydrogen Releasing Compound injection.
Hydrogen Releasing Compound is a product designed specifically
for the in-situ treatment of chlorinated solvent based contamination
in the groundwater environment. Hydrogen Releasing Compound
is a viscous liquid that is pressure injected directly into
the subsurface. Upon contact with water, Hydrogen Releasing
Compound slowly hydrolyzes and is broken down by microbial
action. During this process, lactic acid is released and
utilized by microbes to produce hydrogen. The resulting
hydrogen is then used in a microbially mediated process
known as reductive dechlorination. This step-by-step biodegradation
process (reductive dechlorination) reduces harmful contaminants
into harmless end products.
Hydrogen Releasing Compound injection was used to complete
the degradation of the chlorinated compounds to a acceptable
levels.
40 lbs of Hydrogen Releasing Compound were injected into
25 locations in the area of the plume. Groundwater sampling
and analysis ids performed quarterly to determine the efficiency
of the degradation. The analysis is summarized in Table
1.
Location:
Louisville, KY
Regulatory Basis:
RCRA, OSHA, NPDES, municipal regulations
Contaminants: Chemical: Tetrachloroethylene and dry
cleaning solvents
