TRIANGLE CHEMICAL CO.
BRIDGE CITY, TX
On this page:
- What Is Being Done to Clean Up the Site?
- What Is the Current Site Status?
- EPA’s Involvement at the Site
- Emergency Response and Removal
- Operable Units (opens new page)
- Cleanup Progress (opens new page)
The Triangle Chemical Company site is located in Bridge City in Orange County, Texas. A chemical mixing and blending facility operated at the site from the early 1970s until 1981. Chemicals handled during operations included industrial cleaning compounds, automotive brake fluid, windshield washer solvent, hand cleaners and pesticides. Poor waste management practices resulted in soil and groundwater contamination and fishkills in Coon Bayou. Following cleanup, operation and maintenance activities and groundwater monitoring are ongoing. EPA took the site off the Superfund program’s National Priorities List (NPL) in April 1997.
What Is Being Done to Clean Up the Site?
The site is being addressed through federal and state actions.
About 53,000 gallons of hazardous liquids and over 3,000 cubic yards of contaminated sludge waste have been remediated at the site. About 1,000 55-gallon drums, 21,000 gallons of tank liquids and 350 cubic yards of contaminated trash, debris and soil have been removed from the site. The State of Texas is currently monitoring the site for remedy effectiveness.
EPA has conducted five-year reviews at the site. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent review concluded that response actions at the site are in accordance with the remedy selected by EPA and that the remedy continues to be protective of human health and the environment in the short term. Actions to ensure long-term protectiveness include groundwater sampling and maintenance in accordance with an approved operation and maintenance manual, continuing groundwater monitoring at well MW-7, repairing the fence and replacing damaged or missing well caps.
What Is the Current Site Status?
The site’s long-term remedy, selected in 1985, included deep-well injection of liquids (53,000 gallons) and mechanical aeration of contaminated soils to release volatile organics to the atmosphere under controlled conditions. The remedial action finished in September 1990. Operation and maintenance activities and groundwater monitoring are ongoing.
Following cleanup, EPA took the site off the NPL in April 1997.
EPA’s Involvement at the Site
The Triangle Chemical Company operated a chemical mixing and blending facility on site from the early 1970s until 1981. Chemicals handled at the facility included industrial cleaning compounds, automotive brake fluid, windshield washer solvent, hand cleaners and pesticides.
Raw materials and finished products were stored at the site in surface storage tanks and 55-gallon drums. Waste management practices at the site were poor, and contamination at the site resulted from discharges from deteriorated drums and spills and leaks from drums and tanks. Local residents reported seven fish kills in Coon Bayou during a six-year period between March 1976 and October 1982. The fish kills were believed to have resulted from discharges of hazardous materials from the Site to the bayou.
The site owner/operator abandoned the site in 1981.
Emergency Response and Removal
Cleanup has also included removal actions, or short-term cleanups, to address immediate threats to human health and the environment. In 1982, EPA installed a fence, removed drums, bulked and solidified contaminated soils, and sent soils and equipment to a permitted landfill. About 1,000 55-gallon drums, 21,000 gallons of tank liquids, and 350 cubic yards of contaminated trash and soil were removed. In 1985, EPA repaired the fence and dug a drainage canal at the site.
During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.