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3.1 Spoilage of paint in the container is often related to the use of contaminated raw materials, water (particularly recycled washwater), vessels, piping, and equipment in the manufacturing plant. There is a need for a simple method to determine the presence or absence of microorganisms in plants that manufacture paints and coatings. Such a determination enables the manufacturer to establish the point of contamination (that is, raw materials or problem housekeeping areas in the plant) to help in solving the spoilage problem.NOTE 1: Some contamination in plant areas is to be expected, since microorganisms are ubiquitous and cannot generally be eliminated practically (it is what an in-can preservative is supposed to control). Excessive levels of contamination or contaminated raw materials can exceed the capability of the preservative. If you have excessive contamination in the plant, there are methods for decontamination including steam, preservatives, bleach, etc. These should be discussed with your biocide supplier and used with care. Recovery of spoiled or contaminated products is often not feasible, so an adequate level of the appropriate biocide in conjunction with good plant housekeeping practices are essential. Your biocide supplier can also help here.3.2 This test method may be used by persons without basic microbiological training, but some training on aseptic techniques would be recommended.NOTE 2: The reliability of the results obtained from this test method is extremely dependent on the techniques employed. Improper techniques can result in a sterile sample appearing to be contaminated, and even worse, a contaminated sample appearing to be sterile (see also 5.1). It is recommended that you consult with your biocide supplier, raw material supplier, or an independent testing laboratory to confirm questionable results.1.1 This test method covers a procedure for the determination of the microbial condition (contamination or sterility) of raw materials used in the manufacture of paint, and the microbial condition of paint and paint manufacturing areas.1.2 The values in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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5.1 The NVR determined by this test method is that amount that can reasonably be expected to exist on hardware exposed in environmentally controlled areas.5.2 The evaporation of the solvent at or near room temperature is to quantify the NVR that exists at room temperature.5.3 Numerous other methods are being used to determine NVR. This test method is not intended to replace methods used for other applications.1.1 This test method covers the determination of nonvolatile residue (NVR) fallout in environmentally controlled areas used for the assembly, testing, and processing of spacecraft.1.2 The NVR of interest is that which is deposited on sampling plate surfaces at room temperature: it is left to the user to infer the relationship between the NVR found on the sampling plate surface and that found on any other surfaces.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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4.1 This guide addresses issues related solely to strategies and the development of a plan to address wildfire-related physical and chemical changes to water resources in Source Water Protection Areas. This guide does not include specific advice on risk assessment. Mitigation strategies and planning may consist of a wide variety of actions by individuals, communities, or organizations to prepare for the impacts of wildfires on water quality and quantity in Source Water Protection Areas (see Guide E3136).4.2 Source water protection activities not only help the utility identify risk, but they are also necessary to educate regulatory agencies, permitting authorities, and the community about the impacts that their actions can have on source water quality or quantity of the drinking water.4.3 Example Users: 4.3.1 Federal, tribal, state, or municipal facility staff and regulators, including departments of health, water, sewer, and fire;4.3.2 Financial and insurance institutions;4.3.3 Federal, tribal, state, or local land managers;4.3.4 Public works staff, including water systems, groundwater supplies, surface water supplies, stormwater systems, wastewater systems, publicly owned treatment works, and agriculture water management agencies;4.3.5 Consultants, auditors, state, municipal and private inspectors, and compliance assistance personnel;4.3.6 Educational facilities such as experimental forests and nature preserves;4.3.7 Non-regulatory government agencies, such as the military;4.3.8 Wildlife management entities including government, tribal, and non-governmental organizations (NGOs);4.3.9 Cities, towns, and counties, especially in developing climate vulnerability strategies and plans;4.3.10 Commercial and residential real estate property developers, including redevelopers;4.3.11 Non-profits, community groups, and land owners.4.4 Coordination and cooperation must fit into the process for improving community preparedness.4.4.1 Preparedness is based first on the community developing a broad awareness and understanding of the risks that are present locally. Next comes a community-wide evaluation of which community members or assets are most vulnerable to risks, the mechanisms or pathways of risks, and the existing capabilities to address those risks should a wildfire occur (see Guide E3241). The capabilities being evaluated include more than the ability of the first responders or wildland firefighters to take actions. It includes the capabilities of all community members to take appropriate actions.4.4.2 All communities have capability gaps when evaluated against the risks present in the community. Strategic planning aims to fill those capability gaps with prioritization for efforts developed by the community members. Again, improved preparedness is the goal, not simply focusing on response capacity. A wildfire preparedness plan is a good first step.4.4.3 Filling capability gaps requires the use of all the regulatory and social tools available to the community and its partners. All community members have a stake in accident prevention, consequence reduction, and improved collective ability to communicate and respond. Improvements are made through increased awareness, education, training, cooperative programs, and practice. Addressing the identified capability gaps can include a broad range of options such as accident prevention to creation of expectations for the actions of community members to be able to shelter, evacuate, and provide aid to others. Stakeholder engagement is critical to successfully closing capability gaps. This could include forest management, clearing fuel from around structures, and upgrading water filtration systems.4.4.4 Accomplishing these tasks is a community-level activity. While it might be led by an emergency manager or local emergency planning committee, the key to successful preparedness planning is broad coordination and cooperation involving all community members (see Guide E3241).1.1 Overview—Wildfires pose a significant risk to water utilities as they can cause contaminants of concern to be released into surface water and groundwater supplies (1).2 This can endanger human health if systems were not designed to manage these contaminant loads.1.2 Purpose—Mitigation measures of wildfire effects on sediment loads, trace minerals, and contaminants of concern on runoff in a Source Water Protection Area (2) is an expanding area of study that does not have a full set of regulations at the federal or state level. This guide provides public-sector and private-sector land managers and water utility operators details on how to assess the potential impacts of wildfires on watersheds and measures that can be employed to minimize or abate those impacts prior to a wildfire occurring or after it occurs.1.2.1 This guide supplements existing watershed and Source Water Protection Area guidance.1.2.2 This guide will recommend fuel management prior to a wildfire, suppression strategies during a wildfire, and mitigation opportunities for both forests and water treatment systems after the wildfire. It will also support collaboration between involved stakeholders (see Fig. 1 below).FIG. 1 Place-based characteristics for consideration when assessing threats to water supplies and treatment due to a wildfire (adapted from (3)).1.2.3 The purpose of this guide is to provide a series of options that water utilities, landowners, and land managers can implement to limit the chance of a wildfire, specifically in a drinking water watershed, and mitigation opportunities to protect drinking water after a wildfire occurs. This guide encourages consistent management of forests to limit wildfire risks to water resources. The guide presents practices and recommendations based on the best available science to provide institutional and engineering actions to reduce the likelihood of a wildfire and the potentially disastrous consequences. It presents available technologies, institutional controls, and engineering controls that can be implemented by utilities, landowners, and land managers seeking to mitigate the risk of wildfire in a source watershed. With climate change wildfires are an increasing hazard that can affect drinking water supplies. Often water utilities are not prepared for this risk and this guide seeks to support advanced planning.1.2.4 This guide ties into the ASTM E50 standards series related to environmental risk assessment and management.1.2.5 The guide does not provide risk assessment, per se, but may help set priorities for creating a wildfire resilient watershed.1.3 Objectives—The objectives of this guide are to identify the risks of a source watershed o forest to wildfire and identify actions that can be taken to manage those risks. The guide encourages users to set priorities based upon their associated risk. The guide encourages the us to develop long-term solutions for future wildfire risks.1.4 Limitations of this Guide—Given the different types of organizations that may wish to use this guide, as well as variations in state and local regulations, it is not possible to address all the relevant circumstances that might apply to a particular area. This guide uses generalized language and examples for the user. If it is not clear to the user how to apply standards to their specific circumstances, users should seek assistance from qualified professionals. Risks may vary depending on the entity evaluating the risk. This guide does not take a position on the causes or science of extreme weather, natural disasters, or changing environmental conditions.1.5 The guide uses references and information from many cited sources on the control, management, and reduction of pre- and post-fire impacts.1.6 Several national and international agencies served as sources of information on existing and anticipated levels and management of wildfire risks to drinking water supplies including: the Water Services Association of Australia; the U.S. Department of Agriculture; the U.S. Environmental Protection Agency.1.7 This guide recommends reference to current regulatory information about risks gathered from various state agencies, such as departments of environmental protection and water resources boards.1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Adaptation and resiliency measures, however, may be consistent with, and complementary to, other safety measures.1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.1 This consumer safety specification covers thermal-shock-preventing devices and systems delivering water to showering areas.1.2 This specification establishes the minimum performance requirements for the devices and systems to minimize the risks associated with the hazards of thermal shock.1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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4.1 Purpose—This guide provides a process for reclamation of existing CCPs placed in active and inactive storage areas. The guide includes information on the following activities required for the safe and effective reclamation of CCPs from storage areas: (1) Background Review of CCP Storage Areas; (2) Detailed Characterization of CCP Storage Areas; (3) Harvesting Planning and Scoping of CCP Storage Areas; (4) Harvesting Detailed Design and Approval of CCP Storage Areas; and (5) Harvesting Implementation of CCP Storage Areas. More detailed descriptions of these activities are in Sections 6 through 10.4.2 Potential Beneficial Uses of CCPs—There are many CCP storage areas that are potentially harvestable and can provide a functional benefit in a wide variety of beneficial uses. The beneficial use of CCPs contained in these storage areas can have significant environmental and economic benefits for the facility, the facility owner and the local economy, and can significantly reduce disposal operations (1-4).3 Beneficial use of CCPs can provide industry with a safe and responsible way to economically manage the CCPs, while promoting conservation and recycling/reuse, meeting sustainability goals, and addressing the shortage of CCPs in some building product market areas (1, 2, 5). CCPs consist of fly ash, bottom ash, boiler slag, fluidized-bed combustion (FBC) ash, economizer ash, and flue gas desulfurization (FGD) material (see Terminology E2201 for definitions of CCPs) (6, 7).4.2.1 Fly ash is the most abundant CCP in existing storage areas. Its beneficial uses include, but are not limited to: partial replacement for cement in concrete and concrete products – once in concrete, fly ash reacts with Portland cement to create additional reaction products that improve the strength and durability of concrete; raw feed for the production clinker – fly ash can be calcined along with other minerals to produce clinker; blended cements – fly ash can be an important component in the production of blended cement, especially when pozzolanic properties are desired; filler in plastics – fly ash typically increases the stiffness and compressive strength when used as a filler in plastics; controlled low strength materials (CLSM) – CLSM that include fly ash, typically have improved flowability and strength as well as reduced bleeding and shrinkage; as a soil stabilization material; as an aggregate/soil replacement construction material in structural fill and mine reclamation projects; fillers in carpet backing – fly ash is high performance mineral filler; and as a solidification agent within landfills and remediation projects (6-9).4.2.2 Bottom ash can be beneficially used as raw feed for the production of clinker, as a component of structural fills, and as aggregate in the manufacturing of masonry products (6, 7, 9).4.2.3 Boiler slag can be used as blasting grits and roofing granules. Other applications include, but are not limited to, as a component of structural fills and mineral filler in asphalt (7, 9).4.2.4 Fluidized-bed combustion (FBC) ash can be utilized in various mixtures as a low strength concrete material and soil stabilization agent (7).4.2.5 Flue gas desulfurization (FGD) gypsum, in its majority, is typically beneficially used in gypsum panel products. Other uses include in agricultural applications to improve soil, as a component in structural fills, and as an important component in the production of cement (6, 7, 9).4.3 Approval Context—This guide does not supersede local, state or country requirements, if applicable. This guide is intended to be used for storage areas that are both within an approval authority program and historic (or unpermitted) storage areas.4.3.1 For harvesting of CCPs from storage areas within an approval authority program, governing documents should be carefully reviewed and followed to ensure that all requirements relative to design, operations, monitoring, closure, and post-closure are followed, or that agreements are established to ensure compliance and allow for harvesting activities.4.3.2 For harvesting of CCPs from historic (or unpermitted) storage areas, the project team should engage with the appropriate local, state, province, or country approval, or combination thereof, authorities to determine the appropriate requirements, and should ensure that the appropriate engineering controls and institutional controls are incorporated into the harvesting project.4.4 Use of Guide—Approval authorities may incorporate this guide, in whole or in part, into general guidance documents or site-specific approval documents.4.5 Professional Judgment—This guide presumes the active involvement of an environmental professional who is knowledgeable in how to design and construct storage areas and how to identify acceptable site conditions, or when appropriate, satisfy applicable statutory or approval authority limitations on the use of an operating, closed, or historic (unpermitted) storage area.4.6 Inherent Uncertainty—Professional judgment, interpretation, and some uncertainty are inherent in the processes described herein even when decisions are based upon objective scientific principles and accepted industry practices.1.1 This guide provides a framework to address critical aspects related to the harvesting of CCPs placed in active (operational) and inactive (closed or no longer receiving CCPs) storage areas. These storage areas may be used for wet or dry material, and may be located at active or inactive facilities (that is, coal-fired electric utilities or independent power producers that are currently generating electricity or have ceased to do so, respectively). Also, CCPs may be harvested from active or inactive storage areas located on-site or off-site of the facility.1.2 This guide does not include information on how to determine what storage areas or facilities, or both should be selected for potential harvesting of CCPs, as each entity may approach a harvesting program in accordance with their own harvesting pursuits and regulatory requirements. In addition, it does not include information on how an energy company or other interested parties should evaluate inventories to determine the order of their storage areas for potential harvesting, including consideration of risk, performance and cost. This guide is intended to be used to evaluate the potential harvesting of the storage areas once the storage areas are selected for evaluation.1.3 This guide is comprised of the following sections: , Section 1; Referenced Documents, Section 2; Terminology, Section 3; , Section 4; Project Planning and Scoping, Section 5: Background Review of CCP Storage Areas, Section 6; Detailed Characterization of CCP Storage Areas, Section 7; Harvesting Planning and Scoping of CCP Storage Areas, Section 8; Harvesting Detailed Design and Approval (as applicable) of CCP Storage Areas, Section 9; and Harvesting Implementation of CCP Storage Areas, Section 10. Not all information within this guide will be necessary for each harvesting project, and the user should determine the applicability of each section.1.3.1 Section 1, , includes information related to contents of this guide, as well as what is not included in this guide.1.3.2 Section 2, Referenced Documents, includes published documents referenced within this guide.1.3.3 Section 3, Terminology, includes definitions for terms as they relate to this guide.1.3.4 Section 4, , describes the beneficial use of CCPs stored within active and inactive storage areas, including each CCP potential beneficial use; the context of the guide and its use; the professional judgment that is appropriate for use of the guide; and the inherent uncertainty with the processes described within the guide.1.3.5 Section 5, Project Planning and Scoping, describes the steps needed prior to implementing this guide, including: establishing a project team; determining what storage areas within the facility should be evaluated for potential harvesting of CCPs; determining the potential materials to be harvested; compiling existing land use, environmental compliance, geologic/hydrogeologic, topographic, design and construction information; estimating potential project costs and project schedule with contingencies (if feasible); and identifying factors that may impact the ability to harvest the CCPs.1.3.6 Section 6, Site Background Review of CCP Storage Areas, describes the steps for evaluating the attributes of storage areas at the facility relative to harvesting CCPs.1.3.7 Section 7, Detailed Characterization of CCP Storage Areas, describes the steps for developing and implementing the CCP characterization sampling and analysis plan that will evaluate the chemical and physical characteristics of the CCPs within the storage areas, and determining if amendments to the CCPs will be needed for beneficial use.1.3.8 Section 8, Harvesting Planning and Scoping of CCP Storage Areas, describes the steps necessary to evaluate the approval status of the storage areas and develop a conceptual harvesting strategy and approval approach for the project. Considerations are given for both active and inactive storage areas.1.3.9 Section 9, Harvesting Detailed Design and Approval (as applicable) of CCP Storage Areas, describes the steps needed to prepare the detailed design and approval documents (as applicable) for the CCP storage area harvesting and receive the appropriate approval (as applicable).1.3.10 Section 10, Harvesting Implementation of CCP Storage Areas, describes the steps needed to implement the storage area harvesting plans from installation of the appropriate pre-harvesting components and harvesting the CCPs in accordance with the approval requirements, to completing the post-harvesting monitoring and inspections.1.3.11 Sections 6 through 10 provide the five phases (Phase I through V) of the harvesting process that follow once storage areas are selected for harvesting evaluation. Information related to Phase I through V is located on Table 1.1.4 This guide does not include information on the processing of harvested CCPs, and therefore, additional approvals not discussed within this guide may be needed (for example, residual waste processing approvals, air approvals specific to processing, water control approvals, storage system approvals, etc.).1.5 As CCPs are produced, they may be sent off-site directly to beneficial use applications, such as concrete, wallboard and controlled or structural fills, while the alternative is to direct them to dry or wet storage areas. Although many CCPs were placed in storage due to not meeting applicable specifications for use, many other CCPs were stored for lack of market. In either case, the CCPs retain the ability to be considered a wanted material that provides a functional benefit and a benefit to the environment. They can be harvested and lightly processed, if necessary, to meet relevant product specifications and substitute for the raw materials. Depending on the type and homogeneity of CCPs and the type of storage area from which the materials are being harvested (that is, dry or wet storage areas), this harvesting and processing may include, but is not limited to, excavating or dewatering/dredging, drying, milling, classifying and storing or transporting the material before they are beneficially used.1.6 The CCPs that may be harvested include: fly ash, bottom ash and economizer ash generated by powdered carbon boilers; boiler slag; flue gas desulfurization material; fluidized-bed combustion products as defined in Terminology E2201; cenospheres; or other materials suitable for beneficial use.1.7 Laws and approval requirements governing the use of CCPs vary by locality, state and country and generally do not yet include provisions for CCP harvesting as described herein. The user of this guide is responsible for determining and complying with the applicable approval requirements, which may extend beyond harvesting to include approval requirements or guidance on issues such as storage, transportation, end use and other concepts. This guide complements approval programs where guidance on harvesting is unavailable or insufficient, thereby improving the chance that such storage areas may be repurposed for public or private benefit, or both. It is important to engage and educate the approval authority early and often throughout the planning, design and implementation of the harvesting activities. The project team may also consider affording an opportunity to solicit input from other stakeholders.1.8 This guide should not be used as a justification to avoid, minimize or delay implementation of specific management, operation, closure, or remediation activities, or both as appropriate by law or directive, unless the harvesting activities are conducted in conjunction with such strategies to maintain or achieve compliance with the approval requirements or as otherwise agreed upon with the appropriate authorizing agencies.1.9 This guide should not be used to characterize (that is, environmentally assess) a storage area for ownership transfer although portions of such information may supplement other environmental assessments that are used in such a transfer.1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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4.1 Intended Use—This guide may be used by various parties involved in sediment corrective action programs, including regulatory agencies, project sponsors, environmental consultants, toxicologists, risk assessors, site remediation professionals, environmental contractors, and other stakeholders.4.2 Importance of the CSM—The CSM should be continuously updated and refined to describe the physical properties, chemical composition and occurrence, biologic features, and environmental conditions of the sediment corrective action project (Guide E1689).4.3 Reference Material—This guide should be used in conjunction with other ASTM guides listed in 2.1 (especially Guides E3242 and E3382); this guide should also be used in conjunction with the material in the References at the end of this guide (including 3). Utilizing these reference materials will direct the user in developing representative sediment background concentrations.4.4 Flexible Site-Specific Implementation—This guide provides a systematic but flexible framework to accommodate variations in approaches by regulatory agencies and by the user based on project objectives, site complexity, unique site features, regulatory requirements, newly developed guidance, newly published scientific research, changes in regulatory criteria, advances in scientific knowledge and technical capability, and unforeseen circumstances.4.5 Regulatory Frameworks—This guide is intended to be applicable at a broad range of local, state, tribal, federal (such as CERCLA), or international jurisdictions, each with its own unique regulatory framework. As such, this guide does not provide a detailed discussion of the requirements or guidance associated with any of these regulatory frameworks, nor is it intended to supplant applicable regulations and guidance. The user of this guide will need to be aware of the regulatory requirements and guidance in the jurisdiction where the work is being performed.4.6 Systematic Project Planning and Scoping Process—When applying this guide, the user should undertake a systematic project planning and scoping process to collect information to assist in making site-specific, user-defined decisions for a particular project, including assembling an experienced team of project professionals (that is, experienced practitioners familiar with current sediment site characterization and remediation techniques, as well as geochemistry and statistics). These practitioners should have the appropriate expertise to scope, plan, and execute a sediment data acquisition and analysis program. This team may include, but is not limited to, project sponsors, environmental consultants, toxicologists, site remediation professionals, analytical chemists, geochemists, and statisticians.4.6.1 Depending on the regulatory requirements in a jurisdiction, the choice of background reference areas may need to consider critical habitats and ecological receptors.4.6.2 In this guide, sediment (3.1.11) is defined as material being found at the bottom of a water body. Upland soils of sedimentary origin are excluded from consideration as sediment in this guide.4.7 Other Considerations—This guide does not cover all components of a program to develop representative sediment background concentrations.4.7.1 Sediment sampling and laboratory analyses are not covered in this guide. Guides E3163 and E3164 contain extensive information concerning sediment sampling and laboratory analyses.4.7.2 Data quality objectives are not covered in this guide. Data quality objectives are described in (4).4.7.3 Background study design considerations are not covered in this guide but are described in other references, including Guides E3163 and E3164, as well as (5).4.7.4 The use of data evaluation methodologies to obtain representative background data sets from candidate background data sets is not covered in detail in this guide but is discussed in more depth in Guide E3242.4.7.4.1 Identification and removal of high nondetect values from candidate background data sets are discussed in detail in Guide E3242.4.7.4.2 Identification and removal of outliers from candidate background data sets are discussed in detail in Practice E178, as well as Guide E3242.4.7.4.3 Geochemical methodologies used in evaluating candidate background data sets to obtain representative background data sets are discussed in detail in Guide E3242; their applications during background reference area selection are discussed in this guide.4.7.4.4 Chemical forensics methodologies used in evaluating candidate background data sets to obtain representative background data sets are discussed in detail in Guide E3242; their applications during background reference area selection are discussed in this guide.4.7.5 The use of statistical methods to develop BTVs from representative background data sets and to compare such data sets (or the developed BTVs) to the sediment site data sets are discussed in detail in Guide E3242.4.7.6 Geospatial analysis considerations are not thoroughly discussed in this guidance but are discussed in more depth relative to environmental evaluations in (6), which focuses on quality assurance concerns relative to geospatial analyses.4.7.7 In this guide, only the concentrations of PCOCs are considered to be in scope. Residual background radioactivity is out of scope.4.8 Structure and Components of this Guide—The user of this guide should review the overall structure and components of this guide before proceeding with use, including:Section 1 Section 2 Referenced DocumentsSection 3 TerminologySection 4 Section 5 Overview of Representative Background Concentrations and Calculation ProcessSection 6 Background Reference Area Selection CriteriaSection 7 KeywordsAppendix X1 Case StudyReferences  1.1 This guide focuses on the selection of sediment background reference areas from aquatic environments for the purpose of developing representative sediment background concentrations. These concentrations are typically used in contaminated sediment corrective actions performed under various regulatory programs, including the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA). Although many of the references cited in this guide are CERCLA-oriented, the guide is applicable to remedial actions performed under local, state, tribal, federal, and international cleanup programs. However, this guide does not describe the requirements for each jurisdiction.1.1.1 The sediment background reference areas chosen using this guide will need to be approved by the regulatory agency having jurisdiction (or they should take no exception to the areas chosen), especially if the representative background sediment concentrations will potentially be used to develop sediment remedial criteria.1.2 This guide provides a framework to select appropriate sediment background reference areas for the collection of sediment data in the development of representative sediment background concentrations. It is intended to inform, complement, and support, but not supersede, local, state, tribal, federal, or international guidelines.1.2.1 This guide is designed to apply to contaminated sediment sites where sediment data have been collected and are readily available. Additionally, it assumes that risk assessments have been performed, so that the potential contaminants of concern (PCOCs) that exceed risk-based thresholds have been identified. This guide can be applied at multiple points within the project life cycle (such as site assessment and remedial design).1.2.2 Furthermore, this guide presumes that the identified risk-based thresholds are low enough to pose corrective action implementation challenges or that the sediment site is subject to recontamination from ongoing anthropogenic or natural sources (or both) that are not controlled. In either case, representative sediment background concentrations are useful for determining the extent of corrective remedial actions (when used as remedial goals), evaluating risks posed by representative background concentrations, and establishing appropriate post-remedial monitoring plans.1.2.3 A case study for selecting a background reference area using a tiered decision analysis approach is presented in Appendix X1. It compares various characteristics of a hypothetical sediment site associated with a former upland manufactured gas plant (MGP) facility to three candidate background reference areas and identifies the background reference area that best satisfies the decision analysis objectives.1.3 Methodologies used to develop representative background concentrations at contaminated sediment sites are not discussed in this guide—refer to Guide E3242 for a discussion of these methodologies.1.4 Related ASTM Standards—This guide is related to Guide E3382, which provides the overarching framework for the development of representative background concentrations at contaminated sediment sites, including Conceptual Site Model (CSM) considerations. This guide is also related to Guide E3242, which provides a detailed framework for developing representative sediment background concentrations, including statistical and geochemical considerations as well as background threshold values. This guide is also related to Guide E3164, which addresses corrective action monitoring before, during, and after sediment remediation activities, as well as Guide E3163, which concerns sediment sampling and analytical techniques used during sediment corrective action projects. Guide D4823, which concerns sediment core sampling, is also related to this guide.1.4.1 Specifically, this guide is intended to be used under the overarching framework of Guide E3382, in conjunction with the detailed framework to develop representative background values outlined in Guide E3242, to help ensure appropriate background reference areas are chosen for use in representative background concentration development.1.5 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this guide.1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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