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Record of Decision System (RODS)



Address:  AIR BASE RD- NR ST RTE 395 
City & State:  VICTORVILLE  CA  92392
EPA ID:  CA2570024453
EPA Region:  09
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R09-94/115
ROD Date:  03/07/1994
Operable Unit(s):  01
Media:  groundwater
Contaminant:  TCE
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The 5,347 acre George Air Force Base (GAFB) site is located in the western Mojave Desert. The Mojave River flows along the east side of GAFB. Communities within the Victor Valley area include the town of Adelanto, the City of Victorville, and Silver Lakes, Apple Valley, and Hewsperia. The aquifers at the site are a shallow Upper Aquifer and a deeper Regional Aquifer separated by a Middle Clay/Silt Aquitard. The land use for the adjacent properties consist of residential, industrial, and commercial.

The site includes the Northeast Disposal Area (NEDA) and areas north of the base, the STP Percolation Ponds, and the Industrial/Storm Drain. These sites consist of burial sites, landfill disposal sites, and spill liquid disposal sites. The STP Percolation Ponds, Site WP-26 (S-21), consists of five wastewater treatment plant percolation ponds that were used from the early 1950s until 1980. The percolation ponds were used primarily for discharge of treated sanitary wastes, and may have also received waste soils and solvents from industrial shops. The Industrial/Storm Drain, Site SD-25 (S-20), is located within the central and northeastern portions of GAFB. The Industrial/Storm Drain has been in operation since the early 1940. The industrial/Storm Drain consists of the storm drain southeast of the operation apron (East Storm Drain) and the storm drain between the operation apron and the Crosswind (Secondary)runway (West Storm Drain), as well as the outfall ditch downgradient from the storm drains.

OU1 includes ground water beneath the northeastern portion of GAFB (Northeast Disposal Area [NEDA] and adjacent off-base areas, the Industrial/Storm Drain (site SD-25[S-20]), and the Sewage Treatment Plant (STP) Percolation Ponds (site WP-26[S-21]).

The contaminant of concern in the groundwater is TCE. The source of contamination in not currently known. Several waste disposal sites within NEDA were identified as a potential sources. The Industrial/Storm Drain site has had contaminated sediments removed from the site. The soils beneath this area are not considered hazardous.

In 1986, the California Lahontan Regional Water Quality Control Board (RWQCB) adopted the Cleanup and Abatement Order (CAO). The CAO required the USAF to define the extent of TCE contamination in the groundwater beneath the NEDA, submit a plan for remediation, and begin cleanup of the groundwater. GAFB was placed on the NPL in 1990.

GAFB sites were grouped into three operable units based on the type of waste present and the geographical location. This ROD addresses OU1 which discusses treatment of the TCE plume in groundwater beneath the site. Site SD-25 and Site WP-26 require no further action. The NEDA will be treated for the TCE plume. Operable unit 2 consists of the entire Liquid Fuel Distribution System, including five aboveground tanks, two major pipelines, seven fuel pits, and distribution lines. Contamination at OU 2 is the result of jet fuel releases. OU3 consists of the 58 remaining IRP sites located throughout GAFB. Contamination relates to activities associated with equipment maintenance; fire training; fuel use and storage; pest control laboratory, shop, hospital operation; and old landfill and solid waste disposal.

The remedy status for the media addressed in this ROD are as follows: Groundwater 1 is Final Action. The media associated with this site has a volume of 183,000,000 Sq. Yards. Sediment 1 is No Action. The media volume associated with this site is not documented. Surface Water 1 is No Action. The media volume associated with this site is not documented. The state concurs with the selected remedy.
Remedy:  The selected remedial action, Alternative 2, includes: installation of an estimated 19 groundwater extraction wells; ground water treatment using two air stripping towers with direct discharge of emissions to the atmosphere; discharge of treated water to the Upper Aquifer using the former STP Percolation Ponds; temporary discharge of treated water to an arroyo during the treatability study and potential future discharge to the base golf course; installation and quarterly sampling of an estimated eight new monitoring wells in conjunction with ground water monitoring, the exact number to be determined based on Phase I system efficiency; and implementation of deed restrictions as appropriate to prohibit use of ground water until ground water cleanup levels have been achieved. The overall Capital costs are $ 3,225,100. The annual O&M costs are $394,300 (Year 1 to 30.)
Text:  View full-text ROD [ 162K ]
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