Mercury is a naturally occurring toxic metallic substance that exists as a liquid or vapor in its elemental form and can be a solid or liquid in its compound form. Elemental mercury is used in producing chlorine liquid and caustic soda, in extracting gold from ore or materials that contain gold, and in thermometers, barometers, and electrical switches. Silver-colored dental fillings (known as dental amalgam) typically contain about 50 percent metallic mercury. Mercury forms inorganic compounds when combined with elements such as chlorine, sulfur, or oxygen. Inorganic mercury compounds are used in fungicides, skin-lightening creams, topical antiseptic or disinfectant agents, antibacterials, preservatives in some prescription and over-the-counter medicines, coloring paints, and tattoo dyes. In combination with carbon, mercury forms organic compounds, the most common of which is methylmercury, which can build up in certain edible freshwater and saltwater fish and marine mammals. In recent years, mercury use has declined as the availability of nonmercury-based materials has been developed. For example, the large lamps that light parking lots used to be made with mercury, but are increasingly being made without it. Also, the Mercury-Containing and Rechargeable Battery Management Act of 1996 severely restricted the mercury content in batteries sold after the act’s enactment date of May 13, 1996. Today, the predominant uses of mercury are for the production of chlorine-related products, the amalgam used in dental fillings, and wiring devices that carry electrical current. As figure 1 shows, mercury use in the United States generally declined between 1980 and 1997, according to the U.S. Geological Survey, which compiled those data until 1997. Debris contaminated with mercury can come from various sources—often from a cleanup effort (such as a mercury spill) or demolition of a mercury-contaminated building (such as a laboratory). It can also include structural steel, glass, wooden pallets, cloth, and ruptured containers and devices. When debris contains hazardous amounts of mercury or other hazardous wastes, the hazardous waste debris must be treated to address each of the hazardous wastes. The debris definition excludes the following materials: any material for which a specific treatment standard is provided in 40 C.F.R. Part 268, Subpart D (namely lead acid batteries, cadmium batteries, and radioactive lead solids); process residuals such as smelter slag and residues from the treatment of waste, wastewater, sludges, or air emission residues; and intact containers of hazardous waste that are not ruptured and that retain at least 75 percent of their original volume. A mixture of debris and other material (such as soil or sludge) is subject to the hazardous waste debris regulations if the mixture is comprised primarily of debris, by volume, based on visual inspection. Figure 2 provides a general description of categories of waste that EPA typically classifies as debris and that could be contaminated with mercury. Mercury-contaminated debris (such as bricks, pipes, ruptured metal drums, or large chunks of concrete) may either be treated according to (a) the mercury-specific standards described above (primarily including retorting for high-mercury containing waste), or (b) encapsulated or stabilized, regardless of the mercury concentration level. If managed using the mercury-specific standards, the waste or residue from the retorting process must have their toxicity reduced to specified numerical levels before it can be land disposed. Waste managed according to the alternative treatment standards for hazardous debris does not generally have to be tested before it is land disposed because, according to EPA, obtaining a representative sample is often impractical. In addition, the leach test, which requires grinding as part of the test procedure, may not be appropriate for certain debris treatment technologies, such as encapsulation, since the grinding step would defeat the protective mechanism of the treatment technology. According to EPA officials, the agency encourages businesses that generate mercury-contaminated debris to remove the mercury contaminated material from the debris—a process referred to as source separation. Also, according to EPA and industry, there are some debris items (such as debris contaminated with mixtures of mercury and organic chemicals) that remain difficult to retort; as such, the debris regulations are needed to ensure that such debris is treated and disposed of properly. Table 1 summarizes EPA’s debris regulations and definitions of debris. In 1999, EPA issued an advance notice of proposed rulemaking to conduct a comprehensive review of the RCRA hazardous waste treatment regulations for mercury-containing wastes. EPA had identified mercury as one of the more persistent toxic chemicals regulated under RCRA. EPA stated that potential revisions, if any, would be based on the comments that it received and data obtained from ongoing studies and other sources. Among other issues, EPA requested comments on whether to (1) allow alternative treatment options to retorting for high mercury-containing waste and (2) require retorting for high mercury-containing waste that meets the definition of debris. With respect to allowing alternative treatment options to retorting for high mercury-containing waste, EPA made available data to the public in 2003 on two studies that assessed the feasibility of land disposal for elemental mercury and for difficult-to-treat high mercury-containing waste that had been treated by stabilization. From these studies, EPA concluded that treatment by stabilization may not result in a waste that is stable under some hazardous waste landfill conditions. According to EPA officials, the agency was concerned about using stabilization for elemental mercury in certain landfill conditions where leaching was more likely to occur. EPA did not change the existing hazardous waste regulations for mercury-containing waste. With respect to requiring that high mercury-containing waste that meets the definition of debris be retorted, all of the comments that EPA received, except one, expressed the view that EPA should not modify the alternative treatment standards for debris to require the retorting of debris with high concentration levels of mercury because debris is not always amenable to retorting and because the alternative treatment standards for debris provide needed flexibility to manage difficult-to-treat wastes. EPA did not modify the debris regulations. In 2003, EPA collaborated with the Association of State and Territorial Solid Waste Management Officials and the Northeast Waste Management Officials’ Association to discuss potential mismanagement of mercury-contaminated debris. Based on those discussions, EPA issued a debris memorandum in October 2003 to state waste managers that provided guidance for managing mercury-contaminated debris. In that guidance memorandum, EPA sought to clarify the types of waste that are eligible for treatment under the alternative treatment standards for debris, provide information on the improved capabilities of mercury “retorters” to accept and recover mercury from debris-like waste, and describe how to meet the performance standards for several debris treatment technologies. In a May 2004 follow-up letter, the Administrator of EPA stated that EPA had not found any evidence that there is a significant environmental problem associated with the management of mercury-contaminated debris under EPA’s current rules. Figure 3 shows that mercury-containing waste comes from industrial and nonindustrial sources. EPA requires the collection of data on hazardous waste activities from industrial sources, but not from nonindustrial sources. Nonindustrial sources generate mercury-containing waste, such as household thermometers and dental amalgam, which may, if not recycled, be generally disposed of in municipal solid waste landfills. Under RCRA, hazardous waste landfills and businesses that retort mercury-contaminated debris must meet federal standards designed to protect public health and the environment. Among other standards, hazardous waste landfills must meet minimum technological requirements, including double composite liners, a leachate collection and removal system, and a leak detection system, as well as provide for groundwater monitoring. In addition, hazardous waste landfills may not operate without a RCRA permit. Landfills must also meet other more stringent state requirements, if any, which often include on-site state inspectors and additional groundwater monitoring wells. According to EPA’s RCRAInfo data, there are 19 commercial hazardous waste landfills in the United States, most of which accept mercury-containing waste. Facilities that retort mercury-contaminated debris may only retort wastes below specified organic concentration limits or above specified heating values. In addition, the facilities must comply with waste sampling and analysis requirements. As of 2005, four companies reported that they operate seven facilities that retort mercury-contaminated debris. Figure 4 show the locations of the 19 commercial hazardous waste landfills and seven retorting facilities in the United States. Every 2 years, EPA compiles and summarizes data on the amount of hazardous waste generated, treated, and disposed of. For this biennial report, EPA requires businesses to submit information to the states on each waste generated, treated, and/or disposed of. Among other things, businesses report on the type of hazardous constituent(s) present in the waste, the process (such as chlorine production) or activity (such as demolition) that generated the hazardous waste, and the treatment or disposal method used in managing the hazardous waste. EPA also requests, but does not require, that businesses submit certain additional information about the waste, including the portion of the waste that is debris. EPA maintains the data in its RCRAInfo database. The states conduct data reliability assessments (such as checking for missing values, out-of-range values in each field, and inconsistencies and errors in the data) before entering the information into RCRAInfo; EPA also conducts data reliability assessments of RCRAInfo data. EPA uses its RCRAInfo database, which began in 1999, to maintain data on hazardous waste submitted by states. According to EPA officials, RCRAInfo was designed specifically to track national trends of hazardous waste generation, treatment, and disposal. In 1991, EPA began producing its biennial reports, and it began collecting data on debris as a separate category of physical form in 2001. EPA’s most recent biennial hazardous waste report, for the 2003 reporting cycle, was released in April 2005. According to RCRAInfo data, in 2003, mercury-contaminated debris constituted about 12,000 metric tons of the mercury-containing waste; about 0.4 percent of all mercury-containing waste and about 0.03 percent of all hazardous waste in 2003. Table 2 summarizes RCRAInfo’s data on the total quantities of the hazardous waste, mercury-containing waste, and mercury-contaminated debris treated and disposed of in 2001 and 2003. Appendix II provides more information on mercury-contaminated debris, such as the types of businesses and industry processes that generated the debris and the total quantity of debris that was generated, treated, and disposed of in each state. RCRAInfo data on mercury-contaminated debris may be incomplete. EPA does not require businesses to report to their states on the physical form of the waste, including the portion of their mercury-containing waste that they treated and disposed of as debris. Since reporting the physical form of the waste is optional, the portion of a state’s mercury-containing waste that was treated and disposed of as debris is not known for businesses that did not submit such information. Our analysis of the 2003 RCRAInfo data showed that businesses did not report the optional information on the physical form of the waste in about 9 percent of the instances in which mercury-containing waste was treated and disposed of. These instances accounted for less than 1 percent of the total quantity of mercury-containing waste (10,011 metric tons of the 3,145,726 metric tons of mercury-containing waste). If businesses did not report the optional debris information to states, then the states could not report it to EPA. Businesses that did not submit optional information may have managed a portion of the waste as debris or they may have managed none of this waste as debris. In 2001, the first year businesses reported on debris, RCRAInfo data showed that businesses did not submit the optional information on the physical form of a waste (including debris) in about 14 percent of instances when they treated and disposed of mercury-containing waste. Specifically, these instances accounted for about 4.5 percent of the total quantity of mercury-containing waste treated and disposed of (about 51,179 metric tons of the 1,124,900 metric tons of mercury-containing waste). Furthermore, EPA’s biennially collected data on debris may be reported incorrectly. The directions EPA gave states and businesses for reporting data was ambiguous. EPA had a “debris” category in the Hazardous Waste Report instructions, but it did not provide a complete list of debris items. For example, ruptured metal drums are typically considered debris, but are not included in the list of items in the debris category description and there is a separate “metal drum” category. Thus, if businesses were reporting ruptured metal drums, they might report ruptured drums in the debris category or in the metal drums category. EPA told us that it intended businesses to use the debris category to report all waste identified as hazardous waste debris. Businesses that generate, treat, and dispose of mercury-containing waste are unclear about the types of mercury-containing waste items that can be treated and disposed of as debris. In response to our survey, officials in 21 states and 6 hazardous waste landfill operators identified one or more items as debris that do not typically meet EPA’s debris definition. For example, state officials frequently identified intact fluorescent light bulbs, soil, and intact containers (other than batteries), that include intact devices such as regulators and thermometers, which may contain high levels of mercury, as being subject to the alternative treatment standards for debris. Intact containers (which are excluded from the definition of debris) and the other items (which do not fit the definition of debris) must be treated in accordance with RCRA’s mercury-specific hazardous waste treatment standards. In addition, although EPA’s definition of debris states that “debris means solid material exceeding a 60 millimeter particle size,” officials in 3 states classified ruptured devices and batteries with particle size less than 60 millimeters as debris. These ruptured mercury-containing items may be high mercury-containing waste, which would require retorting. However, if these items were managed according to the alternative treatment standards for debris, they could be encapsulated or stabilized and then disposed of in a hazardous waste landfill. EPA prohibits this treatment and disposal method for high mercury-containing waste, which must generally be retorted; the residual that remains must meet a leach test standard before it can be land disposed. Figure 5 lists the mercury-containing wastes that would typically not be eligible for treatment and disposal using the alternative treatment standards for debris. Table 3 summarizes the views of the state officials we surveyed on whether they would classify certain types of mercury-containing wastes as debris. The wastes listed in table 3 would not typically meet EPA’s definition of debris. However, as the table shows, officials in several states identified nondebris items as being debris, and officials in 21 states reported that they would treat and dispose of at least one item listed in the table as debris although the item would not typically meet EPA’s definition of debris. Appendix III summarizes the state officials’ responses to our survey on mercury-containing waste treatment and disposal practices. In addition to these nondebris items listed in table 3, our survey also asked about three debris items: ruptured drums, ruptured batteries with particle size exceeding 60 millimeters, and other ruptured devices with particle size exceeding 60 millimeters. According to our survey results, only one state’s official considered as debris these three items that EPA would also typically consider to be debris. Officials in 9 other states reported that they classify all of the items on our list as hazardous waste and did not classify any of these items as debris. For example, ruptured drums and ruptured devices were wastes that these states typically classified as hazardous waste, but which EPA classifies as debris. Four of the 14 commercial hazardous waste landfill operators that responded to our survey identified intact fluorescent light bulbs as debris and 3 of the 14 identified intact devices as debris. These items would generally be considered intact containers and therefore be specifically excluded from EPA’s debris definition. The landfill operators responded correctly about particle size requirements for debris. None of the landfill operators identified intact drums as debris. Table 4 summarizes the landfill operators’ views on whether they would classify certain types of mercury-containing wastes as debris. The wastes listed in table 4 would not typically meet EPA’s definition of debris. However, as the table shows, some landfill operators identified nondebris items as being debris, and 6 landfill operators reported that they would treat and dispose of at least one item listed in the table as debris although the item would not typically meet EPA’s definition of debris. Appendix IV summarizes the commercial hazardous waste landfill operators’ responses to our survey on mercury-containing waste treatment and disposal practices. In addition to these nondebris items listed in table 4, our survey also asked about three debris items: ruptured drums, ruptured batteries with particle size exceeding 60 millimeters, and other ruptured devices with particle size exceeding 60 millimeters. According to our survey results, only one landfill considered as debris these three items that EPA would also typically consider to be debris. Furthermore, while EPA allows certain mercury-containing waste to be managed as debris, the commercial hazardous waste landfill operators were sometimes stricter in what they allowed. Specifically, two landfill operators do not allow any mercury-containing waste that we listed in our survey to be managed as debris; two other landfill operators only allow one mercury item (ruptured drums or ruptured batteries with particle size exceeding 60 millimeters) to be treated and disposed of according to the alternative treatment standards for debris; and two landfill operators send debris with high levels of mercury (i.e., greater than 260 milligrams per kilogram) to retorting facilities, including one who reported receiving mercury-containing waste inappropriately labeled as debris, which they sent to a retorting facility for treatment. While our survey results show that officials in many states and most landfill operators have a good understanding of the debris rule, there are some instances in which states and landfill operators identified items as debris that would not typically meet EPA’s debris definition. Since the 2001 Hazardous Waste Report cycle, there is a separate category called “debris” and businesses that determine that their waste is “debris” will naturally use the debris category to report their debris data. However, as discussed earlier, there is confusion about the debris category and more wastes have been reported as debris than EPA considers to be debris. With respect to treatment methods that have been used for debris, EPA’s RCRAInfo data showed considerable differences between the 2001 and 2003 cycles. For this analysis, we used the data reported for debris contaminated only with mercury. We did not use data for debris that contained mercury and other hazardous constituents because the method used to treat the mercury was not readily discernable from the RCRAInfo data. As shown in table 5, in 2001, businesses that generated mercury-only contaminated debris treated most of the debris by metals recovery such as retorting; in 2003, most of the debris was treated by encapsulation or stabilization before land disposal. Most of that 2003 debris that was encapsulated or stabilized before land disposal came from one facility. EPA officials were surprised to learn from us that most debris was not coming from hazardous material spill sites or cleanup sites that typically have on-site state or federal oversight in treatment and disposal decisions. According to our analysis of RCRAInfo’s 2003 data, debris was generated as follows: about 25 percent from ongoing routine processes, such as replacing pipes at a chlorine plant; about 41 percent from intermittent events, such as demolishing a about 17 percent from EPA or state-managed sites, such as hazardous material spills or cleanup efforts; and about 16 percent from pollution control and waste management process residuals. Although businesses determine how to manage the majority of mercury-contaminated debris, EPA officials told us they believe that treatment and disposal decisions were made appropriately because of the multiple oversight mechanisms in place. They specifically cited the hazardous waste manifest system and the EPA and state inspection and enforcement programs, discussed below. In addition, they noted that in order to comply with RCRA, hazardous waste landfill operators must, among other things, obtain a RCRA permit and develop a waste analysis plan that documents the procedures the operator will follow to ensure the facility only handles waste it is permitted to and to ensure proper waste disposal. They also noted that hazardous waste landfills must meet minimum technological requirements, including double composite liners, a leachate collection and removal system, and a leak detection system. EPA and the states oversee compliance with treatment and disposal requirements for mercury-contaminated debris as part of their efforts to monitor multiple types of hazardous waste. We identified four mechanisms that monitor compliance with hazardous waste regulations, including the debris regulations. First, to ensure hazardous waste is properly managed, EPA established a tracking system to monitor hazardous waste from its generation to its disposal. The critical component of this system is the uniform hazardous waste manifest, which is a form prepared by all businesses that generate, transport, or offer for transport, hazardous waste for off-site treatment, recycling, storage, or disposal. The manifest contains information on the type and quantity of the waste being transported, instructions for handling the waste, and signature lines for all parties involved in the disposal process. Each party that handles the waste signs the manifest and retains a copy for themselves. Once the waste reaches its destination, the receiving facility returns a signed copy of the manifest to the business that generated the waste, confirming that the waste has been received by the designated facility. Each of these documents must generally be retained for 3 years. Second, EPA requires businesses that generate, treat, and dispose of hazardous waste to retain certain other records for 3 years. Businesses that generate hazardous waste must send a notification with the initial shipment of every waste. The information that the notification must include varies according to the status of the waste. Facilities that treat hazardous waste are required to send similar notifications along with shipment of the treated wastes to facilities that dispose of hazardous waste. A certification normally accompanies this notification stating that the waste meets its treatment standards and may be land disposed. Facilities that dispose of hazardous waste are the final link in the waste management chain. As a result, these facilities have to test the waste residue that they receive to ensure that it meets the treatment standards. Third, EPA and states’ hazardous waste enforcement programs periodically monitor compliance with EPA regulations, primarily through oversight inspections of facilities and enforcement actions (such as fines and imprisonment) to correct violations. As part of its oversight, EPA provides compliance assistance and incentive programs to encourage businesses to “self-police” and voluntarily discover, disclose, and correct violations of RCRA requirements. In response to our survey, 29 states reported violations related to the treatment and disposal of mercury-containing waste during the past 5 years. Generally, the states discovered the violations during inspections, and most of the violations concerned the treatment and disposal of mercury-containing lamps, such as fluorescent light bulbs. We confirmed in our followup conversations with these states that very few of their reported violations were related to the treatment and disposal of mercury-contaminated debris. In one instance, however, a state agency fined a university $18,000 for hazardous waste violations, such as inappropriately disposing of mercury-contaminated debris. The university had failed to sample a building for mercury contamination before renovating it, and mercury was discovered in several areas after the demolition debris from the renovation had been removed. Lastly, EPA and many states provide citizens with telephone hotlines, Web sites, and forms to file complaints or report potential hazardous waste violations. Some states that responded to our survey stated that some mercury-containing waste violations were reported by citizens’ tips. We recognize that EPA developed the debris regulations to manage waste that could not be readily addressed with the existing RCRA regulations. With respect to mercury-contaminated debris, EPA has assessed the potential environmental risks and determined that the debris standards can be used for mercury-containing waste that meets the debris definition. EPA also provided a guidance memorandum to states intended to clarify the types of wastes that can be managed using the debris standards. However, our analysis showed that states and industry in some instances considered items to be debris that typically do not meet EPA’s definition of debris. As a result, EPA’s information on debris may not be entirely accurate. We believe EPA would have better information on debris in RCRAInfo if EPA would clarify and provide a better description of the types of waste that should and should not be reported in the debris category in the instructions for submitting biennial data. In addition, we recognize that mercury-contaminated debris represents a very small portion of the hazardous waste that is treated and disposed of annually in the United States. However, we are concerned that officials in several states and operators of some commercial hazardous waste landfills that responded to our survey reported that in some instances they would consider items to be debris that typically do not meet EPA’s definition of debris. EPA’s debris definition specifically excludes some of these items. Thus, some waste items might be disposed of inappropriately and in a more risky manner. EPA did not consider the impact of states and industry misunderstanding the debris standards when it examined the use of the debris regulations for high mercury-containing waste. Since there is apparent confusion about what constitutes debris, we believe that EPA should begin an outreach effort to communicate and clarify the types of mercury-containing hazardous wastes that can be treated and disposed of using the debris treatment standards. To better ensure that the businesses that generate, treat, and dispose of hazardous waste are properly managing and reducing the risk of their mercury-containing waste, we are making the following two recommendations to the Administrator of the Environmental Protection Agency: clarify and better describe the types of waste that can and cannot be reported under the “debris” reporting category and include the definition of debris in the instructions for the Hazardous Waste Report and conduct further outreach to communicate to states and hazardous waste landfills the types of mercury-containing wastes that can be treated and disposed of according to the alternative treatment standards for debris. We provided EPA with a draft of this report for review and comment. In oral comments, EPA stated that it agreed with our recommendations. EPA also provided technical comments, which we incorporated into the report as appropriate. As agreed with your office, unless you publicly announce the contents of this report earlier, we plan no further distribution until 30 days from the date of this letter. At that time, we will send copies of this report to the Administrator of the Environmental Protection Agency and other interested officials. We will also provide copies to others upon request. In addition, the report will be available at no charge on GAO’s Web site at http://www.gao.gov. If you or your staff have any questions about this report, please contact me at (202) 512-3841 or at stephensonj@gao.gov. Contact points for our Offices of Congressional Relations and Public Affairs may be found on the last page of this report. GAO staff who contributed to this report are listed in appendix V. The objectives of our review were to determine (1) the mechanisms that the Environmental Protection Agency (EPA) uses to track the treatment and disposal of mercury-contaminated debris and the quantity of mercury- contaminated debris that is disposed of, (2) the extent to which EPA, states, and industry share a common understanding of the types of mercury-containing wastes that can be treated and disposed of as debris, and (3) EPA and state controls that are in place to monitor compliance with EPA’s treatment and disposal requirements for mercury-contaminated debris. For the purpose of this report, we used the following terms: businesses that generate mercury-containing waste—includes private companies and government and university facilities and laboratories; mercury-containing waste—includes hazardous waste that contained any of the six mercury waste codes: (1) D009—mercury; (2) K071— brine purification muds from the mercury cell process in chlorine, in which separately prepurified brine is not used; (3) K106—wastewater treatment sludge from the mercury cell process in chlorine production; (4) P065—mercury fulminate; (5) P092—phenylmercury acetate; and/or (6) U151—mercury; and mercury-contaminated debris—includes mercury-containing waste and was reported under EPA’s debris reporting category. To determine the mechanisms that are used to track the treatment and disposal of mercury-contaminated debris, we reviewed EPA documents and reports (such as EPA’s biennial hazardous waste reports) and EPA regulations and policies. We also interviewed officials at EPA, Ohio’s Environmental Protection Agency, the Association of State and Territorial Solid Waste Management Officials, the Environmental Council of the States, the Environmental Technology Council, and the Northeast Waste Management Officials’ Association. In addition, we met with officials from the departments of Defense and of Energy to discuss the types of mercury- contaminated debris that they generate. To identify the quantity of the hazardous waste that is disposed of as mercury-contaminated debris, we obtained RCRAInfo hazardous waste data for the 2001 and 2003 reporting cycles. We assessed the reliability of the data and found that they were sufficiently reliable for our use. We also developed a survey to gather information from the 50 states and the District of Columbia on, among other things, their treatment and disposal practices for mercury- contaminated debris and whether they collected data more frequently than required by EPA’s biennial hazardous waste reports. To determine the extent to which EPA, states, and industry share a common understanding of the types of mercury-containing wastes that can be treated and disposed of as hazardous debris, we used two surveys to gather information on, among other things, states’ and hazardous waste landfills’ current practices for treating and disposing of certain mercury- containing wastes using EPA’s alternative treatment standards for debris. We surveyed the 50 states and the District of Columbia. We obtained a list of state hazardous waste officials from the Association of State and Territorial Solid Waste Management Officials and the Environmental Council of the States. We confirmed with each state official, that he or she was the appropriate state official to complete our survey on mercury- contaminated debris or obtained the name of another official and confirmed with that official. In addition, we surveyed businesses that treat and dispose of mercury-containing waste. We included in this survey, the 19 U.S. commercial hazardous waste landfills identified by EPA. We obtained the list of hazardous waste landfills by using 2001 and 2003 information from EPA’s RCRAInfo Permit Module. We confirmed with each landfill operator that he or she was the appropriate individual to complete our survey on mercury-contaminated debris. We did not survey federal and private facilities that could also treat and dispose of this waste and facilities that primarily retort mercury-containing waste, such as fluorescent light bulbs. Before distributing the surveys, we conducted pretests of the questions with officials who would be responding to the surveys in order to ensure the validity of the survey questions. For the state survey, we conducted pretests with seven states (Maryland, Nevada, Ohio, Oklahoma, New Hampshire, Montana, and Delaware) located in six EPA regions. For the landfill survey, we conducted pretests with commercial hazardous waste landfill operators in Texas and New York. As part of each pretest, we interviewed the respondents after they had filled out a survey to ensure that the questions were clear, unambiguous, and unbiased and that completing the survey would not place an undue burden on the officials completing it. On the basis of the feedback from the pretests, we modified the questions, as appropriate. For the state survey, we received responses from 48 states and the District of Columbia. We did not receive responses from Alaska and Iowa because EPA has not provided these states with the authority to implement RCRA requirements, and EPA has the lead for all RCRA activities in these states. We received responses from 14 hazardous waste landfill operators in 7 companies that manage 15 of the 19 landfills. Two companies that manage four landfills chose not to participate in our survey. We also interviewed officials at EPA, Ohio’s Environmental Protection Agency, the Association of State and Territorial Solid Waste Management Officials, the Environmental Technology Council, the Northeast Waste Management Officials’ Association, the Chlorine Institute, and the four companies that retort mercury-contaminated debris. Our interviews included questions about the types of mercury-containing wastes that they classify as mercury-contaminated debris. To determine the controls that are in place to monitor compliance with EPA’s treatment and disposal requirements for mercury-contaminated debris, we conducted follow-up interviews with officials in 29 states (Alabama, Arizona, Arkansas, California, Connecticut, Delaware, Florida, Hawaii, Idaho, Illinois, Indiana, Louisiana, Maine, Minnesota, Mississippi, Missouri, Nebraska, Nevada, New Hampshire, North Carolina, New York, Ohio, Pennsylvania, Rhode Island, Texas, Vermont, Virginia, Washington, and Wisconsin) that had identified violations in the treatment and disposal of mercury-containing waste. Our interviews included questions about the type of mercury-containing waste involved in the violations that they reported, the type of business or industry that committed the violation, the way the violations were uncovered, and the type of enforcement actions taken. We also conducted Internet searches on mercury-containing waste violations and reviewed EPA’s requirements and policies for treating and disposing of mercury-contaminated debris and EPA documents related to the development of the debris regulations, such as Federal Register notices. We discussed the effectiveness of these requirements and policies for protecting human health and the environment with officials at EPA, representatives from hazardous waste landfills, Ohio’s Environmental Protection Agency, the Association of State and Territorial Solid Waste Management Officials, the Environmental Technology Council, the Northeast Waste Management Officials’ Association, the Chlorine Institute, and the four companies that retort mercury-contaminated debris. We performed our work between March 2005 and November 2005, in accordance with generally accepted government auditing standards, which included an assessment of data reliability and internal controls. This appendix provides additional information from RCRAInfo on activities related to the generation, treatment, and disposal of hazardous debris contaminated with mercury (mercury-contaminated debris) in the United States during 2001 and 2003. In the first section, we discuss activities related to the generation of mercury-contaminated debris, such as the states where debris was generated and the types of industries that generated the debris. In the second section, we discuss treatment and disposal activities related to mercury-contaminated debris, such as the quantity of mercury-contaminated debris treated and disposed of in each state. According to RCRAInfo data, many states generate mercury-contaminated debris. In 2001, 43 states and the District of Columbia generated 8,028 metric tons of mercury-contaminated debris. Nebraska, Ohio and West Virginia generated about 59 percent of the total (about 4,771 metric tons). Figure 6 shows the quantity of mercury-contaminated debris generated by state in 2001. In 2003, according to RCRAInfo data, 45 states and the District of Columbia reported generating 3,966 metric tons of mercury-contaminated debris. Kentucky, Louisiana, Ohio, Arizona, and New York generated about 52 percent of the total (about 2,076 metric tons). Figure 7 shows the quantity of mercury-contaminated debris generated by state in 2003. According to RCRAInfo data, in 2001, about 95 percent of the total quantity of mercury-contaminated debris (about 7,589 metric tons) was generated by industries representing remediation and waste management services, manufacturing (such as the textile and metals industries), wholesale trade (such as businesses that sell mining products), mining (such as gold ore mining), and utilities (such as power generation and replacing water supply and sewage system equipment). Table 6 summarizes the total quantity of mercury-contaminated debris generated by type of industry in 2001. In 2003, according to RCRAInfo data, about 95 percent of the total quantity of mercury-contaminated debris (about 3,781 metric tons) was generated by industries representing manufacturing (such as the textile and metals industries, remediation and waste management services, educational services (such as colleges and universities), utilities (such as electric power generation and replacing water supply and sewage system equipment), and government activities. Table 7 summarizes the total quantity of mercury-contaminated debris generated by industry type in 2003. With respect to the process or activity that generated the mercury- contaminated debris, RCRAInfo’s 2001 data reported that about 50 percent of the debris (about 4,006 metric tons) came from ongoing production and service processes. Remediation of past contamination and other intermittent events or processes generated about 19 percent (about 1,529 metric tons) and 13 percent (about 1,073 metric tons), respectively. Table 8 provides more information on the types of processes and activities that generated mercury-contaminated debris in 2001. In 2003, according to RCRAInfo data, the majority of the mercury- contaminated debris came from ongoing production and service processes and other intermittent events or processes, about 25 percent (about 1,001 metric tons) and about 41 percent (about 1,639 metric tons), respectively. Table 9 provides more information on the processes or activities that generated mercury-contaminated debris in 2003. According to RCRAInfo data, 18 states treated and disposed of 10,484 metric tons of mercury-contaminated debris in 2001. Ohio and Nevada treated and disposed of about 86 percent of the total quantity of mercury- contaminated debris (about 8,979 metric tons). Figure 8 compares the quantity of mercury-contaminated debris treated and disposed by state in 2001. In 2003, 26 states treated and disposed of 12,029 metric tons of mercury- contaminated debris, according to RCRAInfo data. Alabama, Missouri, Nevada, and Ohio treated and disposed of about 75 percent of the total quantity of mercury-contaminated debris (about 9,078 metric tons). Figure 9 summarizes the quantity of mercury-contaminated debris treated and disposed in each state during 2003. Q1. Which of the following hazardous debris treatment standards has your state implemented? Our state has no hazardous debris treatment standards (percent) (percent) l. Other ruptured devices with particle size exceeding 60 mm (for example, regulator) n. Process residuals (for example, smelter slag) Q2. Assume that the items listed below are different types of mercury-containing hazardous waste (D009, U151). Does your state allow treatment and/or disposal of the following wastes using hazardous debris or hazardous waste treatment standards? Q3. If there are others types of mercury-containing hazardous debris treated and/or disposed in your state, please provide a brief description in the box below. Q4. Does your state collect data on hazardous waste more frequently than required for EPA's Biennial Hazardous Waste Report? (percent) (percent) (percent) (percent) (percent) (percent) (percent) (percent) (percent) (percent) (percent) (percent) 1. During the past 5 years has your landfill accepted any hazardous mercury-containing waste (D009, K071, K106, U151, P065, P092)? (Please check one.) Yes Please continue to Question 2 on the next page. No You do not need to complete additional questions. Please fax this page to: 202-512-2502 or 202-512-2514. Attention: Diana Cheng. For your convenience, a fax cover sheet is on the last page. 2. Assume that the items listed below are different types of mercury-containing hazardous waste (D009, U151) and that these wastes were received from facilities that generated 1,000 kg or more of hazardous waste per month. Would your facility treat and/or dispose of any of the following wastes according to alternative debris treatment standards? (Please check one answer in each row.) Would this waste be treated and/or disposed of according to alternative debris treatment standards? d. Intact drums with at least 75% of their original volume f. Intact fluorescent light bulbs g. Ruptured fluorescent light bulbs i. Ruptured batteries with particle size exceeding 60 mm Ruptured batteries with particle size less than or equal j. k. Other intact devices (for example, thermometer, regulator) l. Other ruptured devices with particle size exceeding 60 mm (for example, regulator) m. Other ruptured devices with particle size less than or equal to 60 mm (for example, thermometer) n. Process residuals (for example, smelter slag) 3. In the space below, please add any comments you wish to make concerning your answers in Question 2. 11 respondents provided comments. 4. During the past 5 years, has your landfill had any instances where you refused to accept mercury-containing debris? Yes Please go to Question 5 No Please go to “Instructions for Returning” at the bottom of this page. Uncertain Please go to “Instructions for Returning” at the bottom of this page. 5. (If Yes to Question 4.) Please describe those instances when your landfill refused to accept mercury-containing debris. If possible, please include a description of the material(s) involved and the reason(s) for refusing the material(s). (You may use the space below, or attach another page.) Reasons cited by respondents included one or more of the following: 1. Landfill does not accept wastes fluorescent light bulbs, switches, and batteries (N=5). 2. Mercury waste from medical, containing a mercury concentration greater than 260 milligrams per kilogram. biological, or infectious waste (N=1). 2. Landfill does not accept metallic mercury. 3. Landfill permit prohibits medical waste in landfill. In addition to the individual named above, J. Erin Lansburgh, Assistant Director; Diana Cheng; Anthony Fernandez; Richard P. Johnson; Jessica Marfurt; Lynn Musser; George Quinn; Kim Raheb; Carol Herrnstadt Shulman; and Jena Sinkfield made key contributions to this report.

Summary: The Environmental Protection Agency (EPA) is responsible for regulating hazardous wastes (such as mercury) under the Resource Conservation and Recovery Act (RCRA). Under RCRA, mercury-containing hazardous waste must meet specific treatment standards before land disposal. But, certain difficult to manage waste due, in part, to its large particle size, can follow alternate "debris" standards that provide diverse treatment options. This report examines (1) the mechanisms that EPA uses to track the treatment and disposal of mercury-contaminated debris and the quantity of this waste, (2) the extent to which EPA, states, and industry share a common understanding of the types of mercury-containing wastes that can be treated and disposed of as debris, and (3) EPA and state controls that are in place to monitor compliance with EPA's treatment and disposal requirements for mercury-contaminated debris. EPA uses its RCRAInfo database to maintain information on all hazardous waste, including mercury-contaminated debris. EPA reported that in 2003, mercury-contaminated debris constituted about 12,000 metric tons--or about 0.4 percent of all mercury-containing waste and about 0.03 percent of all hazardous waste. However, EPA's data on mercury-contaminated debris may be incomplete. Reporting on the physical form of the waste (debris is one of many physical forms) is optional, and businesses did not submit this optional information in about 9 percent of instances when they reported treating and disposing of mercury-containing waste in 2003. In addition, EPA's reporting category for debris does not provide a complete list of items that EPA considers to be debris, and debris can be reported in other categories. The 48 states and the District of Columbia and the 14 commercial hazardous waste landfill operators that responded to our survey do not share a common understanding of the types of mercury-containing waste that EPA allows to be treated and disposed of as debris. For example, in their responses, officials in 21 states and operators of 6 commercial hazardous waste landfills identified as debris waste that is explicitly not debris, such as intact devices containing mercury, and may have used the debris regulations for such waste. Consequently, EPA cannot be certain that businesses are appropriately managing their mercury-containing waste as debris. EPA's mandatory waste tracking and documentation requirements serve as controls to monitor compliance with EPA's treatment and disposal requirements for mercury-contaminated debris. EPA and state oversight inspections and enforcement programs provide additional compliance monitoring with the alternative treatment standards for debris.