20,000 Oil Spills A Year in U.S.: EPA Tells Congress What It Is Doing To Combat BP Oil Blowout in Gulf
Approximately 20,000 oil spills are reported each year to the federal government. While the severity of these spill reports varies widely, EPA evaluates as many as 13,000 spills to determine if its assistance is required. Usually, EPA either manages the oil spill response or oversees the response efforts of private parties at approximately 300 spills per year. That’s what Lisa P. Jackson, Administrator, U.S. Environmental Protection Agency, said in testimony before the Subcommittee on Energy and Environment, Committee On Energy And Commerce, U.S. House of Representatives in the “Combating the BP Oil Spill” hearing held on May 27th. Some estimates have placed the amount of oil that has gushed in to the Gulf at 19 million gallons.
According to Jackson, the administration efforts have focused on responding to the disaster and ensuring that the responsible parties stop the discharge, remove the oil, and pay for all costs and damages. EPA is a key part of those efforts. EPA’s Oil Spill Program focuses on activities to prevent, prepare for and respond to oil spills from a wide variety of facilities that handle, store, or use various types of oil. EPA regulates approximately 620,000 of these facilities, including oil production, bulk oil storage, and oil refinery facilities that store or use oil in above-ground and certain below-ground storage tanks. Additionally, EPA is the principal federal response agency for oil spills in the inland zone, including inland waters. Such inland zone oil spills may come from, oil pipeline ruptures, tank spills, and other sources.
EPA shares the responsibility of responding to oil spills with the U.S. Coast Guard (USCG). Further, we share the responsibility for prevention and preparedness with USCG and several other federal agencies. The USCG leads the response to spills that occur along the coast of the United States, or in the coastal zone, and EPA leads the response to spills that occur in the internal United States, or the inland zones. The exact lines between the inland and coastal zones are determined by Regional Response Teams (RRTs) and established by Memoranda of Agreement (MOAs) between regional EPA and USCG offices. EPA and USCG have a strong relationship and work closely on oil spill response activities regardless of where the spill occurs.
On April 22, 2010, the mobile offshore drilling unit (MODU) Deepwater Horizon, owned and managed by Transocean and contracted by BP P.L.C., sank after an explosion and a severe fire. Since that time, several thousand barrels per day of crude oil is being released into the Gulf of Mexico. The USCG, as the federal On-Scene Coordinator for the oil spill response, is implementing its responsibility to lead the federal environmental response actions in the coastal zone and is overseeing all response operations, including those made by BP.
The Secretary of the Department of Homeland Security has classified this oil discharge as a Spill of National Significance (SONS) and the USCG Admiral Thad Allen has been designated the National Incident Commander (NIC). EPA has integrated some of its staff into the Unified Area Command (UAC) as well as the local incident command posts. We have developed monitoring and assessment plans for surface and subsurface dispersant application, and we are providing technical assistance, air monitoring, and water quality sampling at several locations in Louisiana, Mississippi, and Alabama to assist in the oil spill response.
Air quality monitoring
EPA responders are monitoring for particulate matter, hydrogen sulfide, and total volatile organic compounds (VOCs) associated with the oil as well as the in situ burns. We are also monitoring ozone levels and testing for specific VOCs that are present in crude oil: benzene, toluene, ethylbenzene, xylene and napthalene. We are operating a network of fixed air quality monitoring stations in the Gulf Coast region and specially deployed monitoring and sampling equipment.
In addition, EPA has deployed its twin engine aircraft, the Airborne Spectral Photometric Collection Technology (ASPECT), to detect chemical constituents associated with the oil spill, as well as to monitor for particulates over the in situ burns. We have also brought in two Trace Atmospheric Gas Analyzers (TAGA) mobile laboratory “buses” which are capable of real-time sampling and analysis, and can detect a range of chemical contaminants at very low levels. The TAGA mobile labs have specialized sampling equipment that can be used at remote locations to measure air quality. Additional response air monitoring and sampling sites have been set up by EPA response teams near Venice and Chalmette, LA, Mobile, AL and Ocean Springs, MS. In addition, we are also coordinating data collected from state monitors, and we are analyzing and tracking this information daily to note any unusual readings that might indicate changes in air quality that could trigger a call for action to protect public health.
Water quality monitoring
EPA teams are conducting surface water monitoring activities along the Gulf Coast. EPA is also collecting water quality and sediment samples in areas not yet affected by the oil release, in order to establish a data baseline. Based on the tests at the shoreline completed to date, water quality does not currently pose an increased risk to aquatic life in tested areas; however, EPA will continue to sample and test water to more fully assess water quality. We are currently developing post-impact water quality monitoring plans which will enable us to analyze water and sediment samples to detect chemicals found in oil as well as the chemical constituents of the dispersants that are being used in the oil spill response.
Use of Dispersant
When this crisis occurred, the federal OSC granted BP authorization to use approved dispersant on oil on the surface of the water in an effort to mitigate the shoreline impacts of the oil spill on fisheries, nurseries, wetlands and other sensitive environments. The OSC’s authorization includes water quality monitoring and the dispersant being applied in order to ensure the protection of the environment and public health in affected areas. Dispersants contain a mixture of chemicals, that, when applied directly to the spilled oil, can break down the oil into smaller drops that can sink below the water’s surface. Dispersed oil forms a “plume” or “cloud” of oil droplets suspended in the water. The dispersed oil mixes vertically and horizontally into the water column and is rapidly diluted. Naturally occurring bacteria and other microscopic organisms’ biological processes can degrade the oil droplets over time. EPA is constantly monitoring air and water quality in the Gulf Coast area to ensure the health of nearby residents in protected. The results are posted on EPA’s web site as it becomes available.
Because of the magnitude of the Deepwater Horizon Oil Spill, the RRT authorized BP to conduct tests of a new approach to use dispersants underwater, at the source of the oil leaks. The test data was evaluated to determine the efficacy of subsurface application and it was determined that BP can move forward with full-scale application contingent upon following an adaptive monitoring plan. An EPA/USCG joint directive specifies requirements for BP to follow for subsurface dispersant applications and includes evaluation criteria for the RRT to shut-down subsurface application.
Available data from each subsurface application is analyzed each evening jointly by EPA and the National Oceanic and Atmospheric Administration (NOAA) to determine whether subsurface dispersant application can be continued. Since the subsurface application was initiated, dissolved oxygen levels and the biological tests are within normal ranges. Initial studies indicate that the subsurface application of approximately 10,000-15,000 gallons of dispersants have the equivalent effect on the oil as the surface application of approximately 50,000 gallons of dispersant. Thus, the subsurface application of dispersants is much more efficient and could result in far less dispersants being released into the environment.
It is important to understand that the use of dispersants has environmental trade-offs. Dispersants are generally less toxic than the oils they break down. We know that surface use of dispersants decreases the environmental risks posed by oil spills to shorelines and organisms that live in surface waters. When used this way, dispersants usually break down over the course of weeks. However, the long term effects of dispersants on aquatic life are unknown, which is why EPA and the Coast Guard are requiring BP to implement a sampling and monitoring plan. The federal oil spill response ensures that dispersant operations are constantly monitored to detect any adverse environmental effects that may outweigh the expected benefits of applying dispersants to the Deepwater Horizon oil spill.
However, with the successful use of subsurface application to date, EPA and USCG have issued an Order to BP to eliminate, if operationally possible, surface dispersant application. BP was also directed to find an alternative less toxic dispersant. BP argued that one was not available, but EPA determined that BP’s analysis was insufficient. EPA is performing its own scientific verification of the data BP presented and is conducting a separate scientific analysis to determine whether a less toxic alternative is available at the needed volumes.
The Deepwater Horizon Oil Spill is a massive and potentially unprecedented environmental disaster that has already impacted the lives and the livelihoods of countless people in the Gulf Coast region. While BP is a responsible party for this oil spill, EPA has been working alongside many federal and state agencies to implement emergency oil spill response actions since day one. EPA’s Headquarters Emergency Operations Center is fully operational and is monitoring the overall oil spill response operation.
EPA is also preparing for a potential support role in shoreline assessment and cleanup operations. EPA’s support work may include continued sampling and analysis, identifying and prioritizing sensitive resources, and determining the need for cleanup and recommending cleanup methods and endpoints. We are working within the Unified Command to promote oil recovery and recycling and also to identify landfill locations for any collected oil, oil contaminated booms and other contaminated response materials. EPA, in coordination with the Gulf Coast states, will continue to provide information to both workers and the public about monitoring results and will help to address local community concerns.
EPA will continue to provide full support to the USCG and the UC, and will continue to take a proactive and robust role in monitoring, identifying, and responding to potential public health and environmental concerns. As local Gulf Coast communities assess the impact of the Deepwater Horizon oil spill on their economies, EPA, in partnership with other federal, state, and local agencies, as well as other community stakeholders, will devote its efforts necessary to assist in the oil spill response.
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