SA 80, Steam Plant 4 Petroleum Site

Background
Steam Plant 4 is located in the northern end of downtown and was used to supply steam to various buildings in the area. The plant was built in the late 1940s and was operational until 1995. Underground storage tanks (USTs) 27089 and 27090 were installed in 1950 and stored JP 5 fuel used for the boilers in the steam plant. Two small releases were reported at the site in June 1991 (approximately 50 to 70 gallons) and May 1995 (trace amounts). Investigations were performed at the site from 1992 to 1997. Petroleum hydrocarbons were detected in groundwater at concentrations greater than state cleanup levels and free product was identified on the groundwater surface. Passive free-product recovery was conducted from 1997 to 2000.

The OU A Record of Decision (ROD) identified free-product recovery as the interim remedy for this site in 2000. The 2005 Decision Document identifies monitored natural attenuation (MNA) and institutional controls (ICs) as the final remedy selected for this site. Monitoring commenced during 2005.

Identified Contaminants
Petroleum hydrocarbons in soil and groundwater

Click here to display the data table.

Current Actions
The Navy conducts natural attenuation monitoring at six wells annually.

Petroleum Institutional Controls

Equitable Servitude

Groundwater Restrictions
Domestic use of groundwater in the Downtown Area is restricted because of the potential presence of petroleum compounds and other chemicals in the groundwater. Domestic groundwater use is defined as that used by households or transients for human and animal consumption, cooking, bathing, showering, gardening, irrigation, or use on consumable food products, watering animals and any other domestic use. The excavation notification program at individual sites provides one barrier to drilling; enforcement of the prohibition will also occur through periodic visual inspections. The visual inspections will focus on unauthorized wells in the restricted area. Groundwater use restrictions are included in the equitable servitude.

Inspections and Reporting
The ICs identified in this plan will be inspected and reported on an annual basis, or as necessary. Annual site inspection reports will present the results of inspections. The annual reporting requirements will be included in CERCLA 5-year reviews.

Land Use Restrictions
Commercial and industrial land uses and continuing residential land uses where housing exists in the Downtown Area are permitted in accordance with the Interim Conveyance document. Residential housing is allowed in existing housing units located at Amulet Housing, Arctic Acres Housing and SWMU 62. Future residential housing construction will be evaluated for impacts to ongoing petroleum cleanup activities.

Soil Excavation Restrictions
Soil excavation notifications are required for all the Downtown Area Petroleum sites with ICs. The excavation notifications will be required for each proposed excavation below 2 feet. The notifications will be evaluated to determine whether a proposed project at an IC site is consistent with the land use restrictions. The notifications are an additional tool for the Navy to receive timely information (in the absence of local zoning requirements) to monitor land use restrictions.

Petroleum Engineering Controls

Fencing and Gates

Land Use Control and Ordnance Hazard Signs

Other Engineering Controls
Other engineering controls include landfill caps (CERCLA sites), free-product recovery wells (SAERA sites), and free-product recovery trenches (SAERA sites).

sa 80 survey