Remediation Status: In active remediation

Why the technology was selected:
Bio-augmentation was selected at this site because of the natural favorabilty towards this type of remediation. Because PCE daughter products were present, augmenting natural processes was a sensible technology.

Date implemented:
August 2011

Final remediation design:
Three in-situ bio-augmentation injections have been completed at this site (August 2011, April 2012, and January 2013).
January 2013 injection: 100 gallons of a solution Cl-Out was injected into the shallow groundwater zone through seven temporary injection points located accross accessible areas of the existing PCLE zone. The injection points were advanced using direct push methods on a grid approximately 20 feet. The target injection depth was between 35 and 40 feet below ground surface.

Results to date:
The analytical results of the most recent groundwater monitoring event indicate that stable to decreasing concentrations are present across the site except for a single monitoring well where concetrations continue to fluctuate. Currently, the highest concentration of PCE was reported in MW-13 at a level of )0.108 mg/L. The most current analytical data confirms that only a small portion of the original groundwater plume remains at the site.

Next Steps:
Continued monitoring of the ongoing groundwater response action at the site. Future monitoring and sampling of the groundwater plume will evaluate the effectiveness of the response action and determine if further action is needed.

Cost to Design and Implement:
$58,412.65