THIRD FIVE-YEAR REVIEW AT THE FORMER LOWRY AIR FORCE BASE, DENVER AND AURORA, COLORADO, MARCH 2019, AVAILABLE FOR REVIEW

On behalf of the Air Force Civil Engineer Center (AFCEC), Lowry Assumption, LLC (LAC) conducted the third Five-Year Review of environmental remedies that have been implemented at the former Lowry Air Force Base. Under an Agreement between LAC and AFCEC with oversight from the Colorado Department of Public Health and Environment, a review of long-term remedial activities is conducted every five years to ensure continued protection of human health and the environment. Reviews are conducted for sites where the remedial action is complete, but where hazardous substances, pollutants or contaminants remain at the site above levels that allow for unlimited use and unrestricted exposure; or for sites that require five or more years to complete. In this document, all remedies implemented at Lowry were evaluated, and remedies in place at the Landfill Zone and Basewide Groundwater (Operable Units 2 and 5) were carried forward into a full review. 

Construction of the remedy at OU2 was completed in 2005. The remedy is protective of human health and the environment based on the monitoring data. Exposure pathways that could result in unacceptable risk are controlled through the landfill cap, runoff control systems, implementation of the Operation Maintenance and Monitoring Plan (O&M) plan, and the existing State Environmental Covenant (HMCOV00023) that runs with the land. Post–closure monitoring is ongoing in accordance with a CDPHE-approved plan. No issues were identified with the OU2 remedy that are not covered under the O&M plan.

The remedy at OU5 is protective of human health and the environment in the long-term. All known exposure pathways have been eliminated or adequately controlled through deed restrictions, the State environmental covenants, and aggressive remediation of the groundwater plumes. Since the last five-year review, site-specific standards considered protective of human health were promulgated for TCE and 1,4-dioxane in groundwater. Groundwater monitoring following the completion of active treatment in OU5 continues to provide the data necessary to evaluate contaminant concentrations and to confirm the ongoing effectiveness and protectiveness of the remedy. Despite the need for supplemental remedial injections at the Building 1432 source area to further reduce residual TCE mass, evaluation of these data indicate there is no current adverse effect to the protectiveness of the remedy.

The Third Five-Year Review is available for review on the Air Force Administrative Record under document number AR 591826. The website address is:

http://afcec.publicadmin-record.us.af.mil/. Click on BRAC radio button, click on Lowry AFB, enter 591826 in the Full Metadata Search field, and click on the Search button.

The document is also available for review by appointment at the LAC library at 7921 Southpark Plaza, Suite 109, Littleton, CO.

If you have any questions, or would like more information on the sites under review for the former Lowry Air Force Base, please

contact:

Paul Weaverling
Lowry Assumption, LLC
7921 Southpark Plaza, Suite 109          
Littleton, CO  80120
(303) 972-6633 (phone)
(303) 962-6655 (fax)

Paul Carroll
Air Force Civil Engineer Center
AFRPA/DC REESE
9801 Reese Blvd. North, Suite 210
Lubbock, TX 78416-2107         
(806) 885-5010 (phone)