DEQ created this webpage to provide access to the technical reports and technical correspondence for the petroleum release at the former Exxon Service Station at 9901 Georgetown Pike in Great Falls, Virginia (the “site”). DEQ staff will typically post reports or technical correspondence on this webpage within 30 days of receipt, after staff has reviewed the information and confirmed that it is complete.
Technical reports from the responsible person and DEQ regulatory letter can be found by clicking Links to Documents.
Below is a summary of DEQ's conceptual understanding of the release and groundwater at Great Falls.
DEQ conceptual understanding of the Great Falls site PDF format
On November 22, 2013, DEQ received the revised initial Corrective Action Plan (CAP), prepared by Kleinfelder on behalf of the Responsible Person (RP), Fairfax Petroleum Realty, LLC. DEQ will be seeking public comment for 30 days after Public Notice of the CAP (approximately until December 27, 2013). An electronic copy of the CAP was sent to the Great Falls Citizen’s Association (GFCA) for review and GFCA have provided links to the CAP on their website. The RP has also provided three hard copies to the Great Falls Public Library. Further details on the corrective action plan process and on how to provide comments can be found by following this link.
The CAP approval and a summary of comments received and DEQ’s review of the comments, along with the responsible person’s January 2014 groundwater monitoring report are now available in the "Links to Documents" webpage.
In August of 2009, Exxon, through its consultant, Groundwater and Environmental Services, Inc. (GES), performed a site assessment at the property and discovered petroleum in the groundwater. They reported this finding, and DEQ assigned Pollution Complaint (PC) 2010-3028 to the case. During the latter part of 2009, Exxon performed initial abatement and site characterization activities at the site. As part of the site characterization, Exxon discontinued use of the on-site drinking water well and connected to municipal water. Exxon also identified and, where granted access, sampled drinking water wells within a quarter mile of the site.
Since 2009, groundwater monitoring has continued at the site and off-site potable wells have been sampled by DEQ’s petroleum program contractor, Stoner Culligan. There have been no confirmed detections of petroleum contaminants in samples taken from offsite potable wells.
In 2010, Exxon sold the property to Fairfax Petroleum Realty, LLC, which assumed liability for the cleanup. Fairfax Petroleum Realty hired Kleinfelder as its environmental consultant, and Kleinfelder has been conducting investigation activities since that time. Kleinfelder performed a Remedial Feasibility Study in early 2010, and a supplemental subsurface investigation in late 2011. In 2012, the service station was decommissioned and the underground storage tanks removed.
Groundwater in the Great Falls area is the source of drinking water for many private wells; therefore, Fairfax Petroleum must design a Corrective Action Plan (CAP) to ensure that those private wells are not at risk from this release. In effect, that means the CAP for this site will include a remediation system that can reduce onsite petroleum contaminants to a concentration where it can be predicted by modeling, and demonstrated by groundwater monitoring, that natural attenuation processes will prevent onsite and offsite petroleum contaminants from reaching private water supply wells.
On behalf of Fairfax Petroleum Realty, Kleinfelder submitted a draft initial CAP to DEQ in October 2013. DEQ met with the Great Falls Citizens Association (GFCA) Special Committee on Groundwater Contamination and subsequently requested that Kleinfelder make revisions to the draft. A revised initial CAP was submitted to DEQ on November 22, 2013. Public Notice was made in the Great Falls Connection newspaper on November 27, 2013. Comments are invited for a 30 day period from the initial public notice, or to December 27, 2013. DEQ plans to have a public meeting to hear comments on the CAP at 8.30pm on December 17, 2013, after the December GFCA meeting at the Grange, Great Falls.
This initial CAP involves the construction and installation of a system designed to remove the main source of the remaining contaminants. It also includes the installation of additional monitoring wells and the completion of further system design testing. Once that work has been completed, DEQ anticipates that a CAP addendum will be prepared describing the remediation end points that will protect the beneficial uses of groundwater in the area, particularly the nearby private supply wells.
To provide comments on the CAP, please email the DEQ case manager, Alex Wardle, at firstname.lastname@example.org or write to Virginia Department of Environmental Quality, Northern Regional Office, 13901 Crown Court, Woodbridge, VA 22193. Please include the pollution complaint number, PC2010-3028, in all correspondence.