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Record of Decision System (RODS)

HANFORD 200-AREA (USDOE)

Abstract

Site Name:  HANFORD 200-AREA (USDOE)
Address:  200 AREA 
City & State:  BENTON COUNTY  WA  99352
County:  BENTON
 
EPA ID:  WA1890090078
EPA Region:  10
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/039
ROD Date:  07/15/1999
Operable Unit(s):  15
 
Media:  Debris, Groundwater, Soil
 
Abstract:  In 1988, the Hanford Site was scored using the Environmental Protection Agency's (EPA's) Hazard Ranking System. As a result of the scoring, the Hanford Site was added to the National Priorities List (NPL) in July 1989 as four sites (the 1100 Area, the 200 Area, the 300 Area, and the 100 Area). Each of these areas was further divided into operable units. These operable units contain contamination in the form of hazardous waste, radioactive/hazardous mixed waste, and other Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) hazardous substances.

In anticipation of the NPL listing, the Department of Energy (DOE), EPA, and the Washington State Department of Ecology (Ecology) entered into a Hanford Federal Facility Agreement Consent Order in May 1989. This agreement established a procedural framework and schedule for developing, implementing, and monitoring remedial response actions at Hanford. The agreement also addresses Resource Conservation and Recovery Act (RCRA) compliance and permitting.

In 1991, a CERCLA removal action was initiated in the 200 Area utilizing vapor extraction systems to remove carbon tetrachloride from the vadose zone and prevent further migration to ground water. To date, over 100,000 pounds of carbon tetrachloride have been removed from the soil. This removal action is anticipated to continue until at least the year 2000.

In 1994, in accordance with CERCLA and the National Environmental Policy Act (NEPA), DOE performed a remedial investigation/feasibility study for the Environmental Restoration Disposal Facility.

OU 15:
Operations in the 200 North Area were mainly related to irradiated nuclear fuel storage. The purpose of the facilities in this area was to provide a storage site for the fuel while the radioisotope decay processes for many of the short-lived radioisotopes were occurring. The area is located approximately 7 to 12 km south of the 100 Areas and immediately north of the 200 Areas. The 200-CW-3 waste site group includes contaminant sources resulting from the release of cooling water from the fuel storage basins.

A Interim ROD addressing Area 200 was signed in July 1999.
 
Remedy:  The selected remedy for sites within 200-CW-3 is further sampling to determine whether remedial action is necessary to protect public health and the environment and the "plug-in approach" for remedial action. Because these sites are similar to the 46 100-Area sites where sampling data already indicates the need for remedial action, they will "plug-in" to the same remedy if further sampling indicates remedial action is warranted. There are seven sites within 200-CW-3 and 154 other 100-Area sites that will undergo further sampling.

The selected remedy for both 100 and 200 Areas waste sites will include the following activities:

DOE is required to submit the remedial design report, remedial action work plan, a sampling and analysis plan as primary documents. These documents and associated documents concerning the planning and implementation of remedial design and remedial action shall be submitted to EPA and Ecology for approval prior to the initiation of remediation. The current remedial design report and remedial action work plan may be revised as an alternative to submitting new documents.

Removing and stockpiling any necessary uncontaminated overburden will involve, to the extent practicable, that this material will be used for backfilling excavated areas.

Excavation activities will follow standard construction practices for excavation and transportation of hazardous materials and will follow as low as reasonable achievable (ALARA) practices for remediation workers. Dust suppression during excavation, transportation, and disposal will be required, as necessary.

Treatment, as necessary to meet ERDF waste acceptance criteria will be performed in the 100 Area or at the ERDF prior to disposal. Recycling of treated materials and re-use of treated materials for backfilling excavated areas are expected to reduce remedial action costs. Materials that are transported to ERDF for disposal must meet disposal acceptance criteria, including treatment provisions, for that facility.

The extent of remediation of the waste sites will take into account certain site-specific factors. The waste sites are represented by the following two general categories and the primary factors for consideration are discussed for each:

For shallow sites were the entire engineered structure, soil, or debris contamination is present within the top 4.6 m (15ft), remedial action objectives (RAOs) will be achieved when contaminant levels are demonstrated to be at or below MTCA Method B for inorganics or organics for residential exposure and the 15 mrem/year residential dose level and are at levels that provide protection of groundwater and the Columbia River.

For sites where the engineered structure, and/or contaminated soil and debris begins above 4.6 m (15ft) and extends to below 4.6 m (15ft), the engineered structure (at a minimum) will be remediated to achieve Remedial Action Objectives (RAOs) so the contaminant levels are demonstrated to be at or below MTCA Method B levels for metals and organics for exposure and the 15 mrem/yr. residential dose level and are at levels that provide protection of
 
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