1.1 本指南涵盖了现有油井用于环境现场特征描述和监测的情况。它涵盖了以下主要主题:确定现有水井适用于水文地质特征和地下水质量监测的标准，记录现有水井适用性所需的数据类型，以及现有大容量和小容量水井的相对优势和劣势。 1.2 本指南应与指南一起使用 D5730 ，为环境现场调查提供了一种通用方法。 1.3 本指南未具体说明新监测井或供应井的设计和施工。参考实践 D5092/D5092米 和 D5787 . 1.4 本指南未具体说明地下水取样程序。 请参阅指南 D5903 . 1.5 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本指南提供了有组织的信息收集或一系列选项，不建议采取具体行动。本指南不能取代教育或经验，应与专业判断结合使用。并非本指南的所有方面都适用于所有情况。 本指南并不代表或取代评判特定专业服务是否充分的护理标准，也不应在不考虑项目许多独特方面的情况下应用本指南。本文件标题中的“标准”一词仅表示该文件已通过ASTM共识程序批准。 1.8 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 本指南介绍了在环境调查中使用现有井的一般方法，主要关注地下以及影响地表和地下环境的主要因素。 4.2 现有的油井为地下环境调查提供了宝贵的信息来源。现有油井的具体用途包括: 4.2.1 钻井日志提供了一个地区地下岩性和主要含水单元的信息。现有的井还可以提供井下地球物理测井的途径，用于地层和含水层的解释。示例包括套管井中的自然伽马测井和无套管基岩井中的整套方法（见指南 D5753 ).这些信息可以帮助开发网站的初步概念模型。 4.2.2 利用现有水井进行的试井可以提供有关含水层水文特性的信息。 4.2.3 对现有水井的水位进行监测，只要这些水井位于感兴趣的含水层中，就可以绘制电位图并解释地下水的流向和梯度。 4.2.4 现有水井是评价和监测区域饮用水质量的主要手段。 4.2.5 现有的水井可能有助于绘制污染物羽流图，并有助于持续监测特定地点水平的地下水质量变化。 4.3 只有在充分记录了现有油井的特征，以确定其符合数据使用目的的标准时，才应使用现有油井的数据。

1.1 This guide covers the use of existing wells for environmental site characterization and monitoring. It covers the following major topics: criteria for determining the suitability of existing wells for hydrogeologic characterization and groundwater quality monitoring, types of data needed to document the suitability of an existing well, and the relative advantages and disadvantages of existing large- and small-capacity wells. 1.2 This guide should be used in conjunction with Guide D5730 , that provides a general approach for environmental site investigations. 1.3 This guide does not specifically address design and construction of new monitoring or supply wells. Refer to Practices D5092/D5092M and D5787 . 1.4 This guide does not specifically address groundwater sampling procedures. Refer to Guide D5903 . 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 guide offers an organized collection of information or a series of options and does not recommend a specific course of action. This guide cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this guide may be applicable in all circumstances. This guide is not intended to represent or replace the standard of care by which the adequacy of a given professional service must be judged, nor should this guide be applied without consideration of a project's many unique aspects. The word “Standard” in the title of this document means only that the document has been approved through the ASTM consensus process. 1.8 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 This guide describes a general approach for the use of existing wells in environmental investigations with a primary focus on the subsurface and major factors affecting the surface and subsurface environment. 4.2 Existing wells represent a valuable source of information for subsurface environmental investigations. Specific uses of existing wells include: 4.2.1 Well driller logs provide information on subsurface lithology and major water-bearing units in an area. Existing wells can also offer access for downhole geophysical logging for stratigraphic and aquifer interpretations. Examples include natural gamma logs in cased wells and an entire suite of methods in uncased bedrock wells (see Guide D5753 ). This information can assist in developing the preliminary conceptual model of the site. 4.2.2 Well tests using existing wells may provide information on the hydrologic characteristics of an aquifer. 4.2.3 Monitoring of water levels in existing wells, provided that they are cased in the aquifer of interest, allow development of potentiometric maps and interpretations of groundwater flow directions and gradients. 4.2.4 Existing wells are the primary means by which regional drinking water quality is evaluated and monitored. 4.2.5 Existing wells may assist in the mapping of contaminant plumes, and in ongoing monitoring of groundwater quality changes at the site-specific level. 4.3 Data from existing wells should only be used when characteristics of the well have been sufficiently documented to determine that they satisfy criteria for the purpose for which the data are to be used.