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Site 9

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Site 9 - Camp Moffett Ravine Fill Area

Historical Use

In 1980, during the repair of a collapsed portion of roadway in the Camp Moffett Ravine, fill material consisting of a variety of galley-type wastes were excavated. There was no information to suggest that hazardous waste disposal occurred at the Camp Moffett Disposal Area; however, Naval Station Great Lakes personnel stated that various wastes and materials were placed in a hole where three former ravines converged in the area along the east side of Camp Moffett.

In addition, during 2003 excavation, activities associated with construction of Building 1425, Combat Training Pool, galley-type wastes were also encountered. During the 2005 and 2006 construction of the new Recruit Processing Facility and Uniform Issue Building, non-hazardous material/debris was excavated while digging the footers for the foundation. Geotechnical boring logs for the design of the foundation of the new Recruit Processing Facility and Uniform Issue Building describe fill material including cinders, cobbles, concrete, glass and brick.

Remedial Actions

The RI was conducted to determine the nature of fill material(s) that were placed in three former ravines (which are also described as being three "fingers”), and to identify potential risks associated with Site 9. The chemical data for Site 9 (groundwater and subsurface soil) were used to conduct a Human Health Risk Assessment (HHRA). Exposure of ecological receptors to site contaminants was expected to be minor based on the industrial nature of the site and lack of suitable habitat; therefore, it was not necessary to evaluate potential risks to ecological receptors at the site.

The site investigation also considered whether the movement of site groundwater could pose a threat to off-site areas. Groundwater from the site may be collected in the stormwater piping that discharges into the unnamed tributary to Pettibone Creek east of Sheridan Road. If the groundwater is contaminated, it could contribute to surface water contamination in the tributary. Investigations of Pettibone Creek and the unnamed tributary of Pettibone Creek did not identify surface water contamination, nor whether Site 9 groundwater is a potential contamination source.

The RI was completed in two phases. A geophysical survey was completed prior to Phase I of the RI to determine the edges of the fill area related to the former ravines; this information was used to guide the subsequent media sampling efforts. Phase I of the RI fieldwork was conducted in September 2009 and consisted of the drilling of soil borings, and collecting soil samples for laboratory analysis. Phase II of the RI fieldwork was conducted in November 2009 and consisted of installing permanent groundwater monitoring wells, collecting groundwater samples for laboratory analysis, and surveying of the groundwater monitoring wells.

The Site 9 ROD was signed in 2014. The selected remedy for Site 9 includes LUCs to make sure the property is not developed for residential or non-residential special uses (such as parks, day care, or schools). Potential construction plans would have to be reviewed to protect workers and confirm proper management of contaminated media prior to construction activities. LUCs also prevent groundwater use and stipulate that existing pavement, buildings, and maintained grassy areas are used as barriers to prevent exposure to contamination. The barriers are required to remain intact. LUCs were implemented in May 2016.

Previous Investigations

Previous investigations, plans and documentation at this site are: IAS; RI/RA; FS; PP; and a ROD.

Current Status

LUCs have been implemented at this site.

Site 9 Map

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