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Introduction United States Air Force (USAF) personnel involved in the design, maintenance, deactivation, and/or clean up of small arms firing ranges must address many regulatory considerations. This is an important issue for the Air Force due to site closures, changes in land use and redevelopment, and questions about the likelihood of lead contamination in soils associated with these ranges. The current regulatory framework established for Federal agencies does not provide definitive guidance on the maintenance or remediation of small arms firing ranges. This fact sheet provides an overview of potential compliance issues pertaining to small arms firing ranges, many of which will require site-specific resolution. This fact sheet also discusses application of the Environmental Protection Agency (EPA) Final Munitions Rule ("EPA Munitions Rule"), and introduces the Department of Defense (DoD) Proposed Rule ("DoD Range Rule") regarding the maintenance, closure, and transfer of firing ranges. The information provided will allow the reader to develop an initial plan of action addressing the environmental and health concerns of involved regulatory agencies. Finally, the fact sheet summarizes pollution prevention (P2) practices that should be considered during the management of small arms firing ranges.
Environmental Concerns Small arms firing ranges are essential to weapons training and the mission of the USAF. However, range use often produces soil contaminated with metals from spent bullets. This contamination can create environmental and occupational health problems during range operation and maintenance, as well as during redesign, reuse, and remediation of the range. However, proper management of ranges should alleviate these problems. Lead is the primary soil contaminant of concern at these ranges. Antimony, a hardening agent in bullets, and copper and zinc, the primary components in shell casings and jackets, can also contribute to soil contamination. Bullets are often fragmented and pulverized upon impact with backstops, berms, or bullet traps located at the range. The normal operation of a range can produce lead concentrations of several percent (one percent = ten thousand parts per million) in soils located behind and adjacent to targets and impact berms. Elevated levels of lead have also been found in vegetation growing near impact berms. Care must be taken to protect human health and the environment from lead's potential harmful effects. Antimony, copper, and zinc should be considered as secondary contaminants of potential concern when developing a list of contaminants targeted for analysis and/or cleanup. Lead is a naturally occurring, grayish soft metal, found in the Earth's crust. Human activities such as mining, manufacturing, and the burning of refined fossil fuels have concentrated the amount of lead in certain areas of the environment. Harmful exposures to lead can occur from inhalation of lead dust or fumes, and ingestion of lead contaminated food and water. Lead can accumulate in human, animal, and plant tissue and can cause chronic health effects. Lead contamination in soils at firing range sites can be transported via the following mechanisms: Airborne Particulate Lead - Very small lead particles can become airborne if wind, foot traffic, or maintenance activities disturb contaminated soil. Airborne particles smaller than 10 microns (Sincero, 1996) can be inhaled, and fine particles smaller than 250 microns in diameter can be incidentally ingested (Duggan, 1985). Soil particles smaller than 100 to 200 microns are likely to be ingested because fine particles adhere to skin while larger particles are easily brushed off. Intake of lead through inhalation is usually small (Duggan, 1985). Storm Water Runoff and Erosion - Storm water runoff has the potential to erode and transport contaminated soil and lead particles away from the normal confines of a firing range. Rainfall intensity, ground slope, soil type, and obstructions such as vegetation and fabricated structures will influence the potential transport of lead away from the range. Once the contaminated soil is transported beyond the firing range's boundary, additional environmental impact (e.g., bioaccumulation or bioconcentration) and human exposure could occur. Dissolved Lead in Groundwater/Surface Water - At a neutral pH, lead is relatively insoluble. As water becomes more acidic (decreasing pH), lead solubility tends to increase. When storm water (normally slightly acidic) comes in contact with lead contaminated soil, the lead can be dissolved into the water and transported to nearby groundwater or surface water. If sufficient lead is mobilized, environmental receptors can be affected and risk to human health could occur if these sources are used for drinking water. When groundwater is more than 10 feet below ground surface, it is generally not affected by leaching of lead from soil. However, some regulatory agencies consider dissolved concentrations of lead above 15 micrograms per liter (parts per billion) a potential health concern (Reference: Appendix A: National Primary Drinking Water Standards, Action Level for Lead, 1997.) As with most metals, lead, antimony, copper, and zinc tend to adhere to soil grains and organic material and remain "fixed" in shallow soils.
Review of Applicable Federal Regulations Routine maintenance and the environmental assessment/clean-up of ranges are not specifically addressed in any single Federal regulation. However, portions of different Federal regulations could be applicable in certain situations and should be considered. The following paragraphs provide an overview of these different Federal regulations and how they might apply.
CERCLA
Regardless of whether the RQ for lead or other contaminants has been exceeded at a range, the EPA can, under CERCLA authority, require that lead contaminated soils and groundwater be investigated and remediated, including any off-site environmental contamination originating from the site, if such lead contamination has been determined to pose an unacceptable potential risk to human health or the environment.
RCRA
Under the Resource Conservation and Recovery Act (RCRA), removing lead-containing bullets or lead-contaminated soil from a firing range, or abandoning a range containing such material, may be viewed as "discarding," making the removed materials solid waste subject to RCRA disposal regulations. However, the EPA has deferred to the drafters of the DoD Range Rule (discussed further below) any action on the issue of abandonment or transfer being equivalent to discarding. The DoD Range Rule proposes to address such sites according to a CERCLA-like process, rather than under RCRA authority, where risks posed to human health and environmental receptors are evaluated via site-specific investigations and risk-based remediation goals. This is currently the way the EPA Munitions Rule addresses the investigation and cleanup of active and inactive ranges. The public comment period for the DoD Proposed Rule ended December 1997. The EPA will judge whether the DoD's Final Range Rule "adequately protects human health and the environment" after it is published.
Any RCRA regulated solid waste destined for land disposal must be pre-evaluated for its potential environmental impact. (It is important to note that not all ranges or wastes collected/originating from ranges are necessarily going to be subject to regulation under RCRA. See below under "EPA Final Munitions Rule" and "DoD Proposed Range Rule" for further discussion.) RCRA regulated solid wastes are deemed hazardous if they are a listed waste or exhibit any of the hazardous waste characteristics such as toxicity, ignitability, corrosivity, and reactivity. If a soil sample, when subject to the Toxicity Characteristic Leaching Procedure (TCLP), produces a result in excess of the regulatory limit for lead (5 milligrams per liter (parts per million), then the waste represented by the sample becomes a characteristic hazardous waste due its leachable lead concentration and would be subject to RCRA regulation as a hazardous waste for disposal purposes. As the pH of the lead-containing soil approaches 7 (neutral) or higher (alkaline), its potential for leaching lead above 5 ppm during TCLP testing is lowered. In addition to pH, other important variables affecting the potential for leaching lead from soil samples during TCLP testing are grain size and whether the lead is in elemental form or weathered.
Certain sifting and collection activities can be used to recover lead fragments from range soils. Recovered lead fragments destined for recycling are exempt from RCRA regulation. However, recovered material not destined for recycling and soil handled during the recovery process may be subject to RCRA regulation as a solid waste or a hazardous waste.
According to EPA, authority exists under RCRA to compel remediation where an imminent and substantial endangerment to health or the environment (e.g., contamination of a sensitive habitat or a drinking water supply) may have been created by munitions fragments at a firing range.
While cleanup of lead from small arms firing ranges is normally controlled by CERCLA, the decision regarding which regulatory scheme applies is a fact-specific decision. Thus, these decisions, especially if the range is included in a RCRA permit, should always be coordinated with the servicing Judge Advocate's office. Additional guidance may be found in the EPA memorandum addressed to RCRA/CERCLA national policy managers "Coordination between RCRA Corrective Action and Closure and CERCLA Site Activities, 24 Sep 1996." A copy of this document is available from PRO-ACT.
EPA Final Munitions Rule
Military munitions means all ammunition products and components produced or used by or for the U.S. Department of Defense (DoD) or the U.S. Armed Services for national defense and security, including military munitions under the control of the DoD, the U.S. Coast Guard, the U.S. Department of Energy (DOE), and National Guard personnel. The term military munitions includes, in part: explosives, rockets, bombs, warheads, artillery ammunition, and small arms ammunition. The term does not include nuclear weapons.
Military range means designated land and water areas set aside, managed, and used to conduct research on, develop, test, and evaluate military munitions and explosives, other ordnance, or weapon systems, or to train military personnel in their use and handling. Ranges include firing lines and positions, maneuver areas, firing lanes, test pads, detonation pads, impact areas, and buffer zones with restricted access and exclusionary areas.
Active range means a military range that is currently in service and is being regularly used for range activities.
Inactive range means a military range that is not currently being used, but that is still under military control and considered by the military to be a potential range area, and that has not been put to a new use that is incompatible with range activities.
Under the EPA Munitions Rule, fired military munitions fragments (e.g., spent bullet fragments, debris, and unexploded ordnance) are not considered RCRA waste (i.e., a discarded material) when the munitions were used for their intended purpose, as they would be within the confines of an active or inactive firing range. Under the EPA Munitions Rule, the recovery, collection, and on-range destruction of munitions fragments from an active or inactive range during range clearance activities is also considered "use for intended purpose." Although on-range collection may not by itself render the fragments RCRA waste, the removal of such materials to an off-range location or their burial on-range would be "discarding" and result in the generation of a solid waste, and therefore a potential hazardous waste, subject to RCRA disposal regulations. However, lead-containing munitions fragments destined for off-range reclamation/recycling would be exempted from regulation as a hazardous waste under the RCRA scrap metal provision found in 40 CFR Part 261.6 (a)(3)(ii).
Under the EPA Munitions Rule, fired munitions that land off-range, and are not promptly retrieved, have been discarded and would then be regulated as solid wastes under RCRA.
The EPA did not address in the EPA Munitions Rule the issue of whether munitions fragments at closed ranges (under military control) or transferred ranges (no longer under military control) would be RCRA regulated wastes; that is, if the munitions fragments at closed or transferred ranges would have been "discarded." Instead, the EPA chose to defer the issue in order to allow the agency to evaluate the DoD Range Rule, which proposes that such fragments would not be RCRA waste or subject to cleanup under RCRA (see below). Until the DoD Range Rule is finalized, the provisions of CERCLA would normally control the cleanup of ranges. However, because the decision regarding which regulatory scheme applies is fact-specific, this decision should be coordinated with the servicing Judge Advocate's office.
DoD Proposed Range Rule
The Rule was proposed in response to the EPA Munitions Rule and addresses the management of closed, transferred, and transferring ranges, which were not addressed in the EPA Munitions Rule as discussed above. If finalized, the DoD Range Rule will establish procedures for evaluating and responding to safety, human health, and environmental risks on closed, transferred, and transferring military ranges. To accomplish this, the DoD Range Rule proposes a five-part Range Response Process. This process evaluates appropriate response actions, consistent with CERCLA cleanup provisions, which evaluate actual risks posed by contaminants based on reasonably anticipated future land use. This could mean compliance with significantly different cleanup criteria than might be required under RCRA authority, which would apply if the munitions fragments at closed, transferred, and transferring ranges were designated RCRA solid wastes.
Although the DoD Range Rule is a Proposed Rule, it outlines a reasonable approach to address risk-based management of lead contamination at small arms firing ranges. Copies of DoD's "Closed, Transferred, and Transferring Ranges Containing Military Munitions; Proposed Rule" are available from PRO-ACT or may be obtained by visiting the Defense Environmental Network and Information Exchange (DENIX) World Wide Web site at http://denix.cecer.army.mil/denix/denix.html.
Clean Water Act
Summary
In the end, the determination of appropriate response actions at a range will result from: 1) a site-specific evaluation that characterizes the lateral and vertical extent of contamination and the potential for contaminant movement, 2) the planned future land use at the site, 3) an analysis of exposure pathways/potential receptors, and 4) appropriate risk characterization.
Worker Protection
Another worker protection concern at small arms firing ranges is unexploded ordnance (UXO). The Air Force Deputy Assistant Secretary for Environment, Safety, and Occupational Health has issued a memorandum entitled "Clearance of Unexploded Ordnance at Closing/Realigning Installations" dated 22 March 1996. Although this memorandum offers guidance applicable to closing/realigning installations, it contains information that may be useful to Air Force personnel involved in the clearance, assessment, or clean up of active or inactive ranges. A copy of this document is available from PRO-ACT.
Clean-up Goals for Lead
Other EPA guidance applicable to evaluating adult non-residential exposures that would be consistent with commercial or industrial land use scenarios include:
Remediation goals should be developed to be protective of receptors consistent with planned future land use. Examples of receptors and future land use include: range workers for continued operation as firing range, adult workers for commercial redevelopment of the site, and preschool-age children for residential reuse.
Disposal/Treatment Options for Lead Contaminated Soils
Off-range Disposal
Physical Separation
Stabilization/Solidification
Several techniques for stabilizing and solidifying contaminated soils exist; each should be evaluated with respect to site-specific environmental factors. If soil stabilization and solidification processes are performed on-site, the State may require the facility to obtain a RCRA permit for operation of a treatment, storage, and disposal (TSD) facility. If the stabilized soil mixture does not exceed the hazardous waste threshold as determined by TCLP testing, it may be possible to dispose of it in an ordinary solid waste landfill. Depending on the applicable State regulations, the stabilized soil may be considered safe to remain in-place on site, or to be reused, depending on the results of TCLP testing.
Soil Washing
Other remedial approaches in addition to those discussed above are available and may be appropriate for your particular situation. Additional information on firing range remediation is available from the following sources:
Lead-free Ammunition
Bullet traps
The United States Army Environmental Center (USAEC) is currently evaluating the performance and environmental issues associated with bullet traps. USAEC is reluctant to recommend use of bullet traps on outdoor ranges until further information can be developed from demonstrations and currently installed traps. Manufacturer's claims for complete capture of all fragments and dust are still being evaluated by USAEC. An improperly designed or improperly installed bullet trap could actually increase the potential for lead dust creation and migration on outdoor ranges.
Impact Berms
The design and construction of ranges, including the choice of material for impact berms, should consider pollution prevention opportunities. Ideally, an impact berm should decelerate fired projectiles safely with a minimum of fragmentation and generation of lead dust. The berm material should also be of a texture, e.g., clean sand, that maximizes the ability to separate spent fragments when range clearance activities are undertaken.
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