1.1 目的- 本惯例的目的是定义美国评估 物业环境状况(ECP) 联邦雷亚尔 物业 本惯例适用于 物业 考虑中租赁、超额及盈余 物业 在关闭和重新调整军事设施时，要求归还联邦所有权，例如废弃矿山和其他联邦拥有的 物业 本实践中的步骤是为了满足经1992年《社区环境响应促进法》(CERFA)和联邦real修订的1980年《综合环境响应、赔偿和责任法》(CERCLA)第120(h)节的某些要求 物业 处置 41 CFR C子部分（41 CFR 102-75).因此，这种做法旨在帮助 用户 收集和分析数据和信息以便分类 物业 纳入适用 物业区域类型的环境状况 （根据ASTM D5746 、物业区域类型环境状况标准分类，（见 附录X1 ).一旦记录在案， ECP报告 用于支持适合转让的调查结果(FOST)、适合租赁的调查结果(FOSL)或未污染的 物业 根据CERFA和CERCLA 120（h）的要求进行测定或其组合。 用户 应注意，它没有解决（除非明确指出）在进行 ECP 或在识别和使用 物业面积类型的标准环境状况 . 1.1.1 物业的环境状况- 根据联邦土地所有权机构政策和总务管理局(GSA)的联邦房地产 物业 管理规定、安 ECP 将为任何联邦拥有的 物业 以契约方式转让或租赁。The ECP 将基于现有的环境信息 存储 , 释放 、治疗或 处置 的 有害物质 、弹药或石油产品 物业 确定或发现 显而易见性 存在或可能存在 释放 或受到威胁 释放 任何 有害物质 或石油产品。在某些情况下，在适当的情况下，可能需要额外的数据，包括采样 ECP 支持FOST或FOSL。先前进行的 ECP 可以根据需要更新并用于制造FOST或FOSL。安 ECP 也可能有助于满足其他环境要求（例如，满足CERFA的要求或促进环境状况报告的准备）。此外， ECP 提供有用的参考文件并协助遵守与以下相关的危害缓解政策 石棉 和含铅涂料。The ECP 过程由离散的步骤组成。这种做法主要涉及 ECP -相关信息收集和分析。 1.1.1.1 讨论- 该实践的先前版本涉及环境基线调查（EBS）。2018年国防部4165.66 M基地重建和调整手册将重点改为 ECP DODM 4165.66 M的附录3提供了FOST和FOSL文件编制的指导。DODM 4165.66 M第C2.4.2.3节为国防部提供了指导 物业 建议用于 处置 和再开发。 1.1.2 CERCLA第120(h)节要求- 这种做法旨在帮助识别联邦真实 物业 以及受CERCLA§120(h)有关受污染联邦不动产转让契约的通知和契约要求约束的国防部安装区域 物业 （42 USC 9601及以下），（参见 附录X2 ).必须遵守CERCLA 120（h）要求的其他联邦土地持有机构包括土地管理局、联邦航空管理局和美国林务局。 1.1.3 CERFA要求- 该实践提供了部分满足CERFA[Pub。长度102–426，106统计。2174]，修订了CERCLA。 物业 划分为区域类型1，根据分类 D5746 根据CERFA和联邦管理条例（41 CFR 102-75中编纂的不动产处置规则）的规定，有资格报告为“未受污染”。此外，某些 物业 分类为区域类型2，有证据表明 存储 发生不到一年的，也可以确定为未污染。At装置和联邦 物业 上市于 国家优先事项清单 ，必须获得环境保护署(EPA)的同意 物业 被视为“未受污染”，因此根据CERCLA 120(h)(4)可转让。环境保护局表示，在某些情况下，与联邦土地所有权机构达成一致可能是合适的 物业 根据CERCLA§120(h)(4)，可以确定为未受污染，尽管一些有限数量的 有害物质 或石油产品已储存， 发布 ，或 处置 上的 物业 （见EPA执法与合规保证办公室，2019年5月）。如果可用信息表明 存储 , 释放 ，或 处置 与预计不会对人类健康或环境构成威胁的活动有关（例如，住宅区、沾满石油的路面区域和常规施用杀虫剂的区域），例如 物业 应该有资格快速重复使用。 附注1: 已确认的 环境关注的新兴化学品 可能需要额外的考虑（见国防部副部长办公室。针对国防部监察长办公室的调查结果，对国防部指令4715.18进行澄清和即将进行的更改的政策备忘录，2022年4月）。 1.1.4 石油产品- 石油产品及其衍生物包括在本惯例的范围内。已知储存石油产品或其衍生物一年或一年以上的区域 发布 或 处置 [CERCLA§120(h)(4)]不符合报告为“未受污染 物业 “在塞尔法下。 1.1.5 其他联邦、州和地方环境法- 除了中确定的CERCLA的适用条款之外，本实践不涉及任何联邦、州或地方法律的要求 1.1.2和 1.1.3 .这些 适用或相关且适当的要求(ARAR) 可能会影响联邦政府的最终处置 物业 . 用户 请注意，联邦、州和地方法律可能会施加额外的 ECP 或其他超出本惯例范围的环境评估义务。 用户 还应意识到在以下方面可能存在其他法律义务 有害物质 或发现于 物业 本实践中未解决的问题，以及可能因不遵守而面临民事或刑事制裁或两者兼而有之的风险。 1.1.6 其他联邦、州和地方不动产以及自然和文化资源法- 这种做法不符合任何联邦、州或地方房地产的要求 物业 或自然和文化资源法。 用户 请注意，许多联邦、州和地方法律可能会施加额外的环境和其他法律要求，这些要求必须在转让契约之前满足 物业 超出了本实践的范围。 附注2: 总务管理局2017年11月针对联邦土地持有机构客户的超额不动产尽职调查清单提供了有关联邦土地持有机构客户的更多详细信息 阿拉斯 . 1.1.7 非联邦财产- 部落、州和地方机构也可以使用该标准来评估非联邦 物业 . 1.2 目标- 指导这种做法发展的目标是 (1) 综合并写下 标准做法 用于进行高质量 ECP , (2) 促进高质量、规范发展 物业地图的环境状况 将包括在 ECP 可用于支持FOSTs、FOSLs和其他适用的环境状况报告， (3) 为方便使用 标准分类 的 物业区域类型的环境状况 （见分类 D5746 ), (4) 促进编制和更新标准指南 ECP报告 ，和 (5) 遵守41 CFR 102-75中的联邦不动产处置条例。 1.3 限制- 用户 应该注意的是，虽然 ECP 以与其他“ 尽职调查 “功能，一个 ECP 不准备满足真正的购买者 物业的 进行40 CFR 312中定义的“所有适当调查”的义务，以建立“ 无辜地主辩护 “CERCLA 107责任。任何此类使用 ECP 任何一方都超出了联邦机构的控制范围，也超出了任何 ECP .任何联邦机构、其雇员或承包商均不保证或陈述任何 ECP报告 满足任何一方的任何此类要求。 1.4 该做法的组织- 这个练习有15个部分。部分 1 是范围。部分 2 标识引用的文档。部分 3 术语，包括非本实践特有术语的定义、本实践特有术语的描述以及首字母缩略词和缩写。部分 4 是 意义 以及这种做法的使用。部分 5 描述 用户的 责任。章节 6– 13 是数据收集分析步骤的主体 ECP 过程。部分 14 简要描述了 ECP 步骤3分类 物业区域类型的环境状况 .部分 15 包含关键字列表。十二个附录不具有约束力和非强制性；它们提供背景、指导和示例。 1.5 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践并确定法规限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ======意义和用途====== 4.1 用途- 本实践旨在供联邦机构使用，并且 环境专业人士 为了方便 ECP 努力。它还旨在供以下人员使用: 物业地图的环境状况 和 ECP报告 用于支持未受污染的CERFA 物业 识别和 物业 适合通过租赁或契约转让。GSA法规解决了 处置 联邦的 物业 （41 CFR§105-72），要求土地持有机构声明 (a) 没有证据表明 有害物质活性 ，或 (b) 有证据表明 有害物质活性 发生在 物业 .如果有证据表明 有害物质活性 发生于 物业 、土地持有机构有“ 尽职调查 提供关于所有“应报告数量”的详细、准确信息的义务 有害物质 存储， 发布 ，或 处置 的 物业 它向GSA报告 处置 根据CERCLA必须报告的特定物质及其报告限值在40 CFR§302.4和40 CFR§373中描述。如果土地持有机构披露 有害物质活性 发生在 物业 ，则土地持有机构必须断言是否 所有要求的补救措施 保护人类健康和环境所必需的 有害物质 . 4.1.1 The ECP报告 根据本实践准备的可用于符合联邦管理法规，即41 CFR 102-75中编纂的不动产处置规则。 4.2 使用说明: 4.2.1 使用不限于CERCLA- 这种做法旨在帮助 用户 开发有关环境状况的信息 物业 因此对广泛的人有用，包括那些可能没有实际或潜在CERCLA责任的人（参见40 CFR 373、41 CFR 102-75和《联邦土地政策和管理法》第208节，公法94-579）。 4.2.2 住宅租户╱买家及其他- 这并不意味着多户住宅建筑的住宅租户、单户住宅或其他住宅房地产的租户或 住宅 供自己住宅使用，进行 ECP 与该等交易有关。因此，这些交易不包括在术语商业房地产交易中。因此，尽管这样 物业 可能包含在 ECP ，他们的 居住者 不得被视为为进行 ECP . 4.2.3 特定站点- 这种做法是针对具体地点的，因为它涉及联邦房地产环境条件的评估 物业 因此，这一做法没有解决交易中提出的许多其他问题，例如购买商业实体；或其中的权益，或其资产的权益，很可能涉及与 物业 以前拥有或经营或其他场外环境负债。 4.3 相关实务- 参见实践 E1527 和 E2247 . 4.4 原则- 以下原则是本惯例和所有相关惯例的组成部分，旨在解决任何歧义或行使本惯例赋予的酌处权时参考 用户 或 环境专业 在执行 ECP 或者在判断 用户 或 环境专业 已进行适当调查或以其他方式进行充分调查 ECP . 4.4.1 不确定性未消除- 没有 ECP 可以完全消除有关潜力的不确定性 公认的环境条件 与 物业 执行此惯例旨在减少有关潜在 公认的环境条件 与 物业 于可行的最低水平，但并非完全消除该等不确定性，以及确认合理的时间及成本限制 物业 信息。 4.4.2 调查的程度是可变的- 不是每个联邦 物业 将保证相同水平的 ECP 努力。与良好做法一致，适当水平的 ECP 将由 物业 受制于 ECP 以及在其行为中形成的信息。 4.4.3 与后续查询的比较- 不应仅仅因为某项调查没有查明 公认的环境条件 与 物业 .这 ECPs 必须根据当时和在作出判断的情况下所作判断的合理性进行评估。后续 ECPs 不应被视为判断任何先前适当性的有效标准 ECP 基于后见之明、新信息、开发技术或分析技术的使用或其他因素。 4.5 环境基线调查的持续可行性- 安 ECP 达到或超过本惯例，并在后续使用日期前不到180天完成，被认为对该使用有效。安 ECP 未达到或超过本惯例或在180天前完成的，可在以下情况下使用 4.6– 4.6.5 . 4.6 既往ECP使用情况- 这种做法承认 ECPs 根据本惯例执行或以其他方式包含在编制时合理准确的信息，将包括随后的信息 用户 可能希望使用以避免进行重复 ECP 程序。因此，本实践描述了应遵循的程序，以帮助 用户 确定在先前执行的ECP中使用信息的适当性。先验制度 ECP 除了本实践中其他地方规定的具体程序外，还应遵守以下原则: 4.6.1 事先信息的使用-受制于 4.6.4 , 用户 和 环境专业人士 可能会使用先前的信息 ECPs 前提是此类信息是通过满足或超过本实践要求的程序生成的，或者准确说明了所提供信息的局限性。当使用来自 ECP 其整体未能达到或超过本惯例的要求，则使用应限于 ECP 基于 ECP报告 ，该 环境专业 发现相当准确。 附注3: 这种做法的早期版本需要审查和分析一组小得多的记录。 4.6.2 先前ECP达到或超过- 受制于 4.6.4 ，先验 ECP 可全部使用，而不考虑这些惯例中规定的具体程序，如果在 用户 ，先验 ECP 符合或超过本惯例的要求和 物业 可能影响 物业区域类型的环境状况 与 物业 自上次以来不太可能发生重大变化 ECP 进行了。在作出这一判断时， 用户 应考虑 物业 受 ECP 以及周围地区的情况 物业 . 4.6.3 当前调查- 除非在 4.6.2 ,之前 ECPs 如果没有对可能影响环境条件的条件进行当前调查，则不应使用 物业 与 物业 自上次以来可能发生了重大变化 ECP 进行了。对于一个 ECP 为了与这种做法保持一致，一个新的 目视检查 , 访谈 ，更新 记录审查 和其他适当的活动。 4.6.4 实际知识例外- 如果 用户 或 环境专业人员 进行 ECP 实际知道正在使用的信息来自先前的 ECP 是不准确的，或者如果是明显的，基于通过 ECP 或进行 ECP 所使用的信息不准确，这种信息来自先前的 ECP 不得使用。 4.6.5 关于先前ECP使用的合同问题- 前人和后人之间的合同和法律义务 用户 的 ECPs 或介于 环境专业人士 谁进行了先验 ECPs 以及那些想使用这种先验的人 ECPs 超出了本实践的范围。

1.1 Purpose— The purpose of this practice is to define good commercial and customary practice in the United States for assessing the environmental condition of property (ECP) of federal real property . This practice applies to property under consideration for lease, excess and surplus property at closing and realigning military installations, claims reverting to federal ownership such as abandoned mines, and other federally-owned property . The steps in this practice are conducted to fulfill certain requirements of the Comprehensive Environmental Response, Compensation and Liability Act of 1980 (CERCLA) section 120(h), as amended by the Community Environmental Response Facilitation Act of 1992 (CERFA) and the federal real property disposal regulations codified in 41 CFR Subpart C (41 CFR 102-75). As such, this practice is intended to help a user to gather and analyze data and information in order to classify property into the applicable environmental condition of property area types (in accordance with the ASTM D5746 , Standard Classification of Environmental Condition of Property Area Types, (see Appendix X1 ). Once documented, the ECP report is used to support Findings of Suitability to Transfer (FOSTs), Findings of Suitability to Lease (FOSLs), or uncontaminated property determinations, or a combination thereof, pursuant to the requirements of CERFA and CERCLA § 120(h). Users of this practice should note that it does not address (except where explicitly noted) requirements for appropriate and timely regulatory consultation or concurrence, or both, during the conduct of the ECP or during the identification and use of the standard environmental condition of property area types . 1.1.1 Environmental Condition of Property— In accordance with the federal landholding agency policies and General Services Administration’s (GSA) federal real property management regulations, an ECP will be prepared or evaluated for its usefulness (and updated if necessary) for any federally-owned property to be transferred by deed or leased. The ECP will be based on existing environmental information related to storage , release , treatment, or disposal of hazardous substances , munitions, or petroleum products on the property to determine or discover the obviousness of the presence or likely presence of a release or threatened release of any hazardous substance or petroleum product. In certain cases, additional data, including sampling, if appropriate under the circumstances, may be needed in the ECP to support the FOST or FOSL. A previously conducted ECP may be updated as necessary and used for making a FOST or FOSL. An ECP also may help to satisfy other environmental requirements (for example, to satisfy the requirements of CERFA or to facilitate the preparation of environmental condition reports). In addition, the ECP provides a useful reference document and assists in compliance with hazard abatement policies related to asbestos and lead-based paint. The ECP process consists of discrete steps. This practice principally addresses ECP -related information gathering and analysis. 1.1.1.1 Discussion— Prior versions of this practice referred to environmental baseline surveys (EBS). The 2018 Department of Defense 4165.66M Base Redevelopment and Realignment Manual changed the focus to ECP . Appendix 3 of DODM 4165.66M provides direction on the preparation of FOST and FOSL documentation. Section C2.4.2.3 of DODM 4165.66M provides direction for Department of Defense property proposed for disposal and redevelopment. 1.1.2 CERCLA Section 120(h) Requirements— This practice is intended to assist with the identification of federal real property and DoD installation areas subject to the notification and covenant requirements of CERCLA § 120(h) relating to the deed transfer of contaminated federal real property (42 USC 9601 et seq.), (see Appendix X2 ). Examples of other federal landholding agencies that must comply with CERCLA §120(h) requirements include the Bureau of Land Management, the Federal Aviation Administration, and U.S. Forest Service. 1.1.3 CERFA Requirements— This practice provides information to partially fulfill the identification requirements of CERFA [Pub. L. 102-426, 106 Stat. 2174], which amended CERCLA. Property classified as area Type 1, in accordance with Classification D5746 is eligible for reporting as “uncontaminated” under the provisions of CERFA and the Federal Management Regulations, Real Property Disposal rules codified in 41 CFR 102-75. Additionally, certain property classified as area Type 2, where evidence indicates that storage occurred for less than one year, may also be identified as uncontaminated. At installations and federal property listed on the National Priorities List , Environmental Protection Agency (EPA) concurrence must be obtained for the property to be considered “uncontaminated” and therefore transferable under CERCLA § 120(h)(4). The EPA has stated that there may be instances in which it would be appropriate to concur with the federal landholding agency that certain property can be identified as uncontaminated under CERCLA § 120(h)(4) although some limited quantity of hazardous substances or petroleum products have been stored, released , or disposed of on the property (see EPA Office of Enforcement and Compliance Assurance, May 2019). If the information available indicates that the storage , release , or disposal was associated with activities that would not be expected to pose a threat to human health or the environment (for example, housing areas, petroleum-stained pavement areas, and areas having undergone routine application of pesticides), such property should be eligible for expeditious reuse. Note 1: Confirmed releases of emerging chemicals of environmental concern may require additional consideration (see Office of the Undersecretary of Defense. Policy Memorandum for Clarifications and Upcoming Changes to Department of Defense Instruction 4715.18 in Response to Department of Defense Office of Inspector General Findings, April 2022). 1.1.4 Petroleum Products— Petroleum products and their derivatives are included within the scope of this practice. Areas on which petroleum products or their derivatives were stored for one year or more, known to have been released or disposed of [CERCLA§ 120(h)(4)] are not eligible to be reported as “uncontaminated property ” under CERFA. 1.1.5 Other Federal, State, and Local Environmental Laws— This practice does not address requirements of any federal, state, or local laws other than the applicable provisions of CERCLA identified in 1.1.2 and 1.1.3 . These applicable or relevant and appropriate requirements (ARARs) may have a bearing upon the ultimate disposition of the federal property . Users are cautioned that federal, state, and local laws may impose additional ECP or other environmental assessment obligations that are beyond the scope of this practice. Users should also be aware that there are likely to be other legal obligations with regard to hazardous substances or petroleum products discovered on property that are not addressed in this practice and that may pose risks of civil or criminal sanctions, or both, for noncompliance. 1.1.6 Other Federal, State, and Local Real Property and Natural and Cultural Resources Laws— This practice does not address requirements of any federal, state or local real property or natural and cultural resources laws. Users are cautioned that numerous federal, state, and local laws may impose additional environmental and other legal requirements that must be satisfied prior to deed transfer of property that are beyond the scope of this practice. Note 2: The General Services Administration’s Excess Real Property Due Diligence Checklist for Federal Landholding Agency Customers, November 2017, provides additional detail on federal ARARs . 1.1.7 Non-Federal Property— This standard may also be used by tribal, state and local agencies to assess the environmental condition of non-federal property . 1.2 Objectives— Objectives guiding the development of this practice are (1) to synthesize and put in writing a standard practice for conducting a high quality ECP , (2) to facilitate the development of high quality, standardized environmental condition of property maps to be included in an ECP that can be used to support FOSTs, FOSLs, and other applicable environmental condition reports, (3) to facilitate the use of the standard classification of environmental condition of property area types (see Classification D5746 ), (4) to facilitate the development of a standard guide for preparing and updating ECP reports , and (5) comply with the Federal Real Property Disposal regulations codified in 41 CFR 102-75. 1.3 Limitations— Users of this practice should note that, while many of the elements of an ECP are performed in a manner consistent with other “ due diligence ” functions, an ECP is not prepared to satisfy a purchaser of real property’s duty to conduct “all appropriate inquiries”, as defined in 40 CFR 312, to establish an “ innocent landowner defense ” to CERCLA § 107 liability. Any such use of any ECP by any party is outside the control of the federal agencies and beyond the scope of any ECP . No warranties or representations are made by any federal agency, its employees, or contractors that any ECP report satisfies any such requirement for any party. 1.4 Organization of This Practice— This practice has 15 sections. Section 1 is the scope. Section 2 identifies referenced documents. Section 3 , Terminology, includes definitions of terms not unique to this practice, descriptions of terms unique to this practice, and acronyms and abbreviations. Section 4 is the significance and use of this practice. Section 5 describes user's responsibilities. Sections 6 – 13 are the main body of the data gathering analysis steps of the ECP process. Section 14 briefly describes the ECP Step 3 classification of environmental condition of property area types . Section 15 contains a list of keywords. The twelve appendices are non-binding and non-mandatory; they provide background, guidance, and examples. 1.5 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. 1.6 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. ====== Significance And Use ====== 4.1 Uses— This practice is intended for use by federal agencies, and environmental professionals in order to facilitate ECP efforts. It is also intended for use by preparers and reviewers of environmental condition of property maps and ECP reports used to support CERFA uncontaminated property identifications and property suitable for transfer by lease or by deed. GSA regulations addressing the disposal of federal property (41 CFR §105-72), require the landholding agency to assert either that (a) there is no evidence of hazardous substance activity , or (b) there is evidence of hazardous substance activity that occurred on the property . If there is evidence that hazardous substance activity occurred on the property , the landholding agency has a “ due diligence ” obligation to provide detailed, accurate information on all “reportable quantities” of hazardous substances stored, released , or disposed of on property that it reports to GSA for disposal . The specific substances that must be reported under CERCLA and their reporting limits are described in 40 CFR §302.4 and 40 CFR §373. If the landholding agency discloses that hazardous substance activity took place on the property , then the landholding agency must assert whether or not all required remedial action necessary to protect human health and the environment has been taken with respect to those hazardous substances . 4.1.1 The ECP reports prepared in accordance with this practice may be used to achieve compliance with the federal Management Regulations, Real Property Disposal rules codified in 41 CFR §102-75. 4.2 Clarifications on Use: 4.2.1 Use Not Limited to CERCLA— This practice is designed to assist the user in developing information about the environmental condition of a property and as such has utility for a wide range of persons, including those who may have no actual or potential CERCLA liability (see 40 CFR §373, 41 CFR §102-75 and Section 208 of the Federal Land Policy and Management Act, Public Law 94-579). 4.2.2 Residential Tenants/Purchasers and Others— No implication is intended that it is currently customary practice for residential tenants of multifamily residential buildings, tenants of single-family homes or other residential real estate, or purchasers of dwellings for one's own residential use, to conduct an ECP in connection with these transactions. Thus, these transactions are not included in the term commercial real estate transactions. Thus, although such property may be included within the scope of an ECP , their occupants shall not be treated as key site personnel with regard to the housing occupied for the purpose of conducting an ECP . 4.2.3 Site-Specific— This practice is site-specific in that it relates to assessment of environmental conditions of federal real property . Consequently, this practice does not address many additional issues raised in transactions such as purchases of business entities; or interests therein, or of their assets, that may well involve environmental liabilities pertaining to properties previously owned or operated or other off-site environmental liabilities. 4.3 Related Practices— See Practices E1527 and E2247 . 4.4 Principles— The following principles are an integral part of this practice and all related practices and are intended to be referred to in resolving any ambiguity or exercising such discretion as is accorded the user or environmental professional in performing an ECP or in judging whether a user or environmental professional has conducted appropriate inquiry or has otherwise conducted an adequate ECP . 4.4.1 Uncertainty Not Eliminated— No ECP can wholly eliminate uncertainty regarding the potential for recognized environmental conditions in connection with a property . Performance of this practice is intended to reduce uncertainty regarding the potential for recognized environmental conditions in connection with a property to the minimum practicable level, but not eliminate such uncertainty altogether, as well as to recognize reasonable limits of time and cost for property information. 4.4.2 Level of Inquiry is Variable— Not every federal property will warrant the same level of ECP effort. Consistent with good practice, the appropriate level of ECP will be guided by the type of property subject to ECP and the information developed in its conduct. 4.4.3 Comparison with Subsequent Inquiry— It should not be concluded or assumed that an inquiry was not an appropriate inquiry merely because the inquiry did not identify recognized environmental conditions in connection with a property . The ECPs must be evaluated based on the reasonableness of judgments made at the time and under the circumstances in which they were made. Subsequent ECPs should not be considered valid standards to judge the appropriateness of any prior ECP based on hindsight, new information, use of developing technology or analytical techniques, or other factors. 4.5 Continued Viability of Environmental Baseline Survey— An ECP meeting or exceeding this practice and completed less than 180 days prior to the date of a subsequent use is presumed to be valid for that use. An ECP not meeting or exceeding this practice or completed more than 180 days previously may be used to the extent allowed by 4.6 – 4.6.5 . 4.6 Prior ECP Usage— This practice recognizes that ECPs performed in accordance with this practice or otherwise containing information which was reasonably accurate at the time prepared will include information that subsequent users may want to use to avoid undertaking duplicative ECP procedures. Therefore, this practice describes procedures to be followed to assist users in determining the appropriateness of using information in ECPs performed previously. The system of prior ECP usage is based on the following principles that should be adhered to in addition to the specific procedures set forth elsewhere in this practice: 4.6.1 Use of Prior Information— Subject to 4.6.4 , users and environmental professionals may use information in prior ECPs provided such information was generated as a result of procedures that meet or exceed the requirements of this practice or accurately state the limitations of the information presented. When using information from an ECP which, as a whole, fails to meet or exceed the requirements of this practice, the use shall be limited to those portions of the ECP which, based upon the limitations and methodology of the ECP report , the environmental professional finds to be reasonably accurate. Note 3: Earlier versions of this practice required the review and analysis of a significantly smaller set of records. 4.6.2 Prior ECP Meets or Exceeds— Subject to 4.6.4 , a prior ECP may be used in its entirety, without regard to the specific procedures set forth in these practices if, in the reasonable judgment of the user , the prior ECP meets or exceeds the requirements of this practice and the conditions at the property likely to affect environmental condition of property area types in connection with the property are not likely to have changed materially since the prior ECP was conducted. In making this judgment, the user should consider the type of property subject to the ECP and the conditions in the area surrounding the property . 4.6.3 Current Investigation— Except as specifically provided in 4.6.2 , prior ECPs should not be used without current investigation of conditions likely to affect the environmental condition of property in connection with the property that may have changed materially since the prior ECP was conducted. For an ECP to be consistent with this practice, a new visual inspection , interviews , an update of the records review , and other appropriate activities may have to be performed. 4.6.4 Actual Knowledge Exception— If the user or environmental professional(s) conducting an ECP has actual knowledge that the information being used from a prior ECP is not accurate or if it is obvious, based on other information obtained by means of the ECP or known to the person conducting the ECP , that the information being used is not accurate, such information from a prior ECP may not be used. 4.6.5 Contractual Issues Regarding Prior ECP Usage— The contractual and legal obligations between prior and subsequent users of ECPs or between environmental professionals who conducted prior ECPs and those who would like to use such prior ECPs are beyond the scope of this practice.