Remediation Status: In groundwater monitoring

Date implemented:
*FY11 Biostimulation

Final remediation design:
Two in-situ treatment events were conducted during fiscal year 2011. The first event involved chemical oxidation with the injection of 400 gallons of potassium permanganate (KMnO4) through 21 injection points. The second event, completed approximately two months after the first, consisted of bioaugmentation with the injection of 200 gallons of Cl-Out® through 20 injection points. On December 13, 2011, additional in-situ groundwater treatment was conducted at the property. During this event, 200 gallons of KMnO4 was injected into the first GWBU through 13 temporary injection points located in approximately the same locations as the FY 2011 injections.

Results to date:
The analytical results of this post-treatment groundwater monitoring event indicate decreasing concentrations across the site within the first groundwater bearing unit. The decreasing trends are attributable to the in-situ response actions completed between May 2011 and December 2011.

Next Steps:
Since this type of groundwater response action typically requires multiple injection iterations to achieve the target goals; additional in-situ injection events could be warranted in the future. However the contractor proposed monitoring the first GWBU to determine if any concentration rebound occurs. It should be noted that additional groundwater response actions are warranted for the second groundwater bearing unit in the future.

Why the technology was selected:
In-situ oxidation for the first GWBU. By reducing the concentrations in the first GWBU, vertical migration to the second and third GWBUs could be reduced if not eliminated.

Date implemented:
FY11 Chem-Ox (2 events)

Final remediation design:
Two in-situ treatment events were conducted during fiscal year 2011. The first event involved chemical oxidation with the injection of 400 gallons of potassium permanganate (KMnO4) through 21 injection points. The second event, completed approximately two months after the first, consisted of bioaugmentation with the injection of 200 gallons of Cl-Out® through 20 injection points. On December 13, 2011, additional in-situ groundwater treatment was conducted at the property. During this event, 200 gallons of KMnO4 was injected into the first GWBU through 13 temporary injection points located in approximately the same locations as the FY 2011 injections.

Results to date:
The analytical results of this post-treatment groundwater monitoring event indicate decreasing concentrations across the site within the first groundwater bearing unit. The decreasing trends are attributable to the in-situ response actions completed between May 2011 and December 2011.

Next Steps:
Since this type of groundwater response action typically requires multiple injection iterations to achieve the target goals; additional in-situ injection events could be warranted in the future. However the contractor proposed monitoring the first GWBU to determine if any concentration rebound occurs. It should be noted that additional groundwater response actions are warranted for the second groundwater bearing unit in the future.

Date implemented:
*FY11 Biostimulation and FY11 Chem-Ox (2 events)

Final remediation design:
Two in-situ treatment events were conducted during fiscal year 2011. The first event involved chemical oxidation with the injection of 400 gallons of potassium permanganate (KMnO4) through 21 injection points. The second event, completed approximately two months after the first, consisted of bioaugmentation with the injection of 200 gallons of Cl-Out® through 20 injection points. On December 13, 2011, additional in-situ groundwater treatment was conducted at the property. During this event, 200 gallons of KMnO4 was injected into the first GWBU through 13 temporary injection points located in approximately the same locations as the FY 2011 injections.

Results to date:
The analytical results of this post-treatment groundwater monitoring event indicate decreasing concentrations across the site within the first groundwater bearing unit. The decreasing trends are attributable to the in-situ response actions completed between May 2011 and December 2011.

Next Steps:
Since this type of groundwater response action typically requires multiple injection iterations to achieve the target goals; additional in-situ injection events could be warranted in the future. However the contractor proposed monitoring the first GWBU to determine if any concentration rebound occurs. It should be noted that additional groundwater response actions are warranted for the second groundwater bearing unit in the future.