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Record of Decision System (RODS)



Address:  OFF RTE 40 
City & State:  ABERDEEN  MD  21005
County:  HARFORD
EPA ID:  MD3210021355
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-00/057
ROD Date:  07/17/2000
Operable Unit(s):  03
Abstract:  Aberdeen Proving Ground (APG) is located on the northwestern shore of the Chesapeake Bay, approximately 15 miles northeast of Baltimore, MD. The installation occupies nearly 72,000 acres of Baltimore and Harford Counties and is divided into two areas known as the Aberdeen Area and the Edgewood Area. The Western Boundary Study Area (WBSA) is located in the Aberdeen Area of APG in Harford County, Maryland.

The WBSA is located along the northwestern boundary of the Aberdeen Area of APG, bounded on the south and the southeast by Old Baltimore and Michaelsville Roads. Parts of the WBSA have been used as an airfield, a testing area for weapons and vehicles, a maintenance facility and storage area for vehicles, a landfill, and a housing area for troops. Because limited weapons testing has been performed in the WBSA in the past and is presently continuing, unexploded ordnance (UXO) can be found in some portions of the study area.

Based in potential receptors, the WBSA was divided into three operable units (OUs). OU-1 is the groundwater in the southwestern two-thirds of the WBSA near the Harforf County well field.

Lands adjacent to the WBSA on all sides are generally undeveloped. Most of the area to the north and the northwest is farmland. To the south and southwest are APG test ranges. There is some development on APG east of the WBSA. The only current users of natural resources in the vicinity are seasonal hunting programs operated by APG including deer and upland game hunting in the fall and turkey hunting in the spring. The nearest human receptors of groundwater from the WBSA are the offpost Harford County population drinking that water distributed to their homes. The closest homes to the study site are adjacent to APG along the northwest boundary.

The WBSA is not on the USEPA's National Priority List (NPL) but APG and the Department of the Army have agreed in a Federal Facility Agreement with the USEPA to follow the CERCLA process in the remediating site.

A Record of Decision (ROD) addressing OU-1 was completed in July 2000.
Remedy:  The selected remedy for Operable Unit 1 (OU-1), Plant Construction with Granular Activated Carbon (GAC) Adsorption, involves enlarging and relocating the existing treatment facility to Harford County's Perryman (HCP) facility and connecting to the system to all eight of the HCP wells. This action addresses the most highly contaminated groundwater. Treatment residuals will be disposed of off-site, such that the site will require long-term management. Because this remedy will result in hazardous substances remaining on site above health based levels, a review will be conducted every five years after commencement of remedial action to insure that this remedy continues to provide adequate protection to human health and the environment. The plant would have a capacity of 5.2 mgd. The treatment system will continue to be a fixed bed GAC system. The GAC system will treat water from HCP-5 and HCP-6, which water is currently contaminated above remedial action levels. The other six wells, which are not currently contaminated, will also be connected to the treatment system. This remedy will be capable of handling any migration of future. In addition, the treatment of uncontaminated water will not shorten the life of the granulated activated carbon or otherwise increase the annual O&M costs. This GAC unit is also capable of handling explosives as well as the halogenated volatile organic compounds (VOCs). Additionally, this remedy includes development if a groundwater monitoring plan and continued yearly monitoring of the Harford County Well Field to identify changes in the plume or groundwater flow. The implementation of this action is predicted on the County and Army agreeing to a long-term contract or other appropriate agreement.

Estimated Capital Cost: $1,675,621
Estimated Annual O&M Cost: $270,928
Estimated Present Worth Cost: $4,260,520
Text:  View full-text ROD [ 486K ]
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