ASTM D6771-21
Standard Practice for Low-Flow Purging and Sampling Used for Groundwater Monitoring

Standard No.

ASTM D6771-21

Release Date

2021

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D6771-21

Scope

1.1 This practice describes the method of low-flow purging and sampling used to collect groundwater samples from wells to assess groundwater quality. 1.2 The purpose of this procedure is to collect groundwater samples that represent a flow-weighted average of solute and colloid concentrations transported through the formation near the well screen under ambient conditions. Samples collected using this method can be analyzed for groundwater contaminants and/or naturally occurring analytes. 1.3 This practice is generally not suitable for use in wells with very low-yields and cannot be conducted using grab sampling or inertial lift devices. This practice is not suitable for use in wells with non-aqueous phase liquids. 1.4 Units—The values stated in SI units are to be regarded as standard. The values given in parentheses are approximate mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.5 This practice offers a set of instructions for performing one or more specific operations. This document cannot replace education or experience and should be used in conjunction with professional judgment. Not all aspects of this practice may be applicable in all circumstances. This ASTM standard 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 document be applied without consideration of a project’s many unique aspects. The word “standard” in the title means only that the document has been approved through the ASTM consensus process. 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.

ASTM D6771-21 Referenced Document

• ASTM D5088 Standard Practice for Decontamination of Field Equipment Used at Nonradioactive Waste Sites
• ASTM D5092/D5092M Standard Practice for Design and Installation of Groundwater Monitoring Wells
• ASTM D5521/D5521M Standard Guide for Development of Groundwater Monitoring Wells in Granular Aquifers
• ASTM D5608 Standard Practice for Decontamination of Field Equipment Used at Low Level Radioactive Waste Sites
• ASTM D5903 Standard Guide for Planning and Preparing for a Groundwater Sampling Event
• ASTM D5978/D5978M Standard Guide for Maintenance and Rehabilitation of Groundwater Monitoring Wells*， 2024-01-01 Update
• ASTM D6089 Standard Guide for Documenting a Ground-Water Sampling Event
• ASTM D6452 Standard Guide for Purging Methods for Wells Used for Groundwater Quality Investigations
• ASTM D6517 Standard Guide for Field Preservation of Ground Water Samples*， 2023-11-01 Update
• ASTM D653 Standard Terminology Relating to Soil, Rock, and Contained Fluids
• ASTM D6564/D6564M Standard Guide for Field Filtration of Groundwater Samples*， 2024-02-01 Update
• ASTM D6634/D6634M Standard Guide for the Selection of Purging and Sampling Devices for Groundwater Monitoring Wells*， 2024-04-21 Update
• ASTM D6725/D6725M Standard Practice for Direct Push Installation of Prepacked Screen Monitoring Wells in Unconsolidated Aquifers*， 2024-04-21 Update
• ASTM D6911 Standard Guide for Packaging and Shipping Environmental Samples for Laboratory Analysis*， 2024-04-21 Update
• ASTM D7069 Standard Guide for Field Quality Assurance in a Groundwater Sampling Event*， 2024-03-15 Update
• ASTM D7929 Standard Guide for Selection of Passive Techniques for Sampling Groundwater Monitoring Wells

ASTM D6771-21 history

• 2021 ASTM D6771-21 Standard Practice for Low-Flow Purging and Sampling Used for Groundwater Monitoring
• 2018 ASTM D6771-18 Standard Practice for Low-Flow Purging and Sampling for Wells and Devices Used for Ground-Water Quality Investigations
• 2002 ASTM D6771-02 Standard Practice for Low-Flow Purging and Sampling for Wells and Devices Used for Ground-Water Quality Investigations