Environmental

Site 11

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Site 11: Production Well “F”

Background

Site 11 originally consisted of a boiler house (Building 215), fuel oil storage area, and a deep bedrock production well known as F-Well. The original boiler house, built in the late-1950s, was approximately 1,000square feet and housed a single boiler unit. In 1961, F-Well was installed adjacent to Building 215 to provide potable water to Plant 1 as well as to the boiler housed in Building 215. Following its installation, attempts to use F-Well were unsuccessful due to sand flowing into the well through fractures in the bedrock and as a result F-Well was never put into production.

In 1962, an addition was added to the boiler house that doubled its size and the number of boilers. During this expansion, F-Well was covered by the building addition’s foundation. In the late-1980s, the boiler house was decommissioned.

In 1995, an advanced site inspection (ASI) was conducted to characterize potential groundwater and soil contamination in and around F-Well and a former oil pit. Prior to the ASI, the facility removed the former oil pit and any visibly contaminated soil. The ASI identified a limited area of soil contamination and an area of alluvial and bedrock groundwater contamination. Furthermore, light aqueous phase liquid (LNAPL) and dense aqueous phase liquid (DNAPL) were detected in F-Well during a downhole video camera survey and over-drilling activity. The LNAPL and DNAPL were removed during the over-drilling activity.

Several investigations were conducted following the ASI, identifying volatile organic compounds and inorganic contamination in groundwater.

 

A Record of Decision (ROD) for Site 11 was signed in January 2012 (the ROD document was combined for Sites 11 and 12 because of their close proximity to each other and similar contaminants). The selected remedy for Site 11 is focused enhanced anaerobic biodegradation, monitored natural attenuation, and institutional controls. Remedial action at Site 11 took place on November 2012 and included injection of a carbon-containing material to the groundwater to treat chlorinated compounds using enhanced reductive dechlorination, in accordance with the ROD. LTM activities, including groundwater sampling, are conducted on an annual basis, and the results are documented in progress reports.

Detailed information from previous investigations conducted at Site 11 is available in the Administrative Record.

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