Standard Guide for Sampling Ground-Water Monitoring Wells

SCOPE
1.1 This guide covers sampling equipment and procedures and "in the field" preservation, and it does not include well location, depth, well development, design and construction, screening, or analytical procedures that also have a significant bearing on sampling results.This guide is intended to assist a knowledgeable professional in the selection of equipment for obtaining representative samples from ground-water monitoring wells that are compatible with the formations being sampled, the site hydrogeology, and the end use of the data.
1.2 This guide is only intended to provide a review of many of the most commonly used methods for collecting ground-water quality samples from monitoring wells and is not intended to serve as a ground-water monitoring plan for any specific application. Because of the large and ever increasing number of options available, no single guide can be viewed as comprehensive. The practitioner must make every effort to ensure that the methods used, whether or not they are addressed in this guide, are adequate to satisfy the monitoring objectives at each site.
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only.
1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Historical
Publication Date
09-Aug-2001
Technical Committee
Current Stage
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Designation:D4448–01
Standard Guide for
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Sampling Ground-Water Monitoring Wells
This standard is issued under the fixed designation D 4448; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope D 5088 Practices for Decontamination of Field Equipment
Used at Waste Sites
1.1 This guide covers sampling equipment and procedures
D 5792 Practice for Generation of Environmental Data
and “in the field” preservation, and it does not include well
Related to Waste ManagementActivities: Development of
location, depth, well development, design and construction,
Data Quality Objectives
screening, or analytical procedures that also have a significant
D 5903 Guide for Planning and Preparing for a Groundwa-
bearing on sampling results.This guide is intended to assist a
ter Sampling Event
knowledgeable professional in the selection of equipment for
D 6089 Guide for Documenting a Ground-Water Sampling
obtaining representative samples from ground-water monitor-
Event
ing wells that are compatible with the formations being
D 6452 Guide for Purging Methods for Wells Used for
sampled, the site hydrogeology, and the end use of the data.
Ground-Water Quality Investigations
1.2 This guide is only intended to provide a review of many
D 6517 Guide for Field Preservation of Ground-Water
of the most commonly used methods for collecting ground-
Samples
water quality samples from monitoring wells and is not
2.2 EPA Standards:
intended to serve as a ground-water monitoring plan for any
EPA Method 9020A
specific application. Because of the large and ever increasing
EPA Method 9022
number of options available, no single guide can be viewed as
comprehensive. The practitioner must make every effort to
3. Terminology
ensure that the methods used, whether or not they are ad-
3.1 Definitions:
dressed in this guide, are adequate to satisfy the monitoring
3.1.1 low-flow sampling—a ground water sampling tech-
objectives at each site.
nique where the purge and sampling rates do not result in
1.3 The values stated in SI units are to be regarded as
significant changes in formation seepage velocity.
standard. The values given in parentheses are provided for
3.1.2 minimal purge sampling—the collection of ground
information only.
water that is representative of the formation by purging only
1.4 This standard does not purport to address all of the
thevolumeofwatercontainedbythesamplingequipment(that
safety problems, if any, associated with its use. It is the
is, tubing, pump bladder).
responsibility of the user of this standard to establish appro-
3.1.2.1 Discussion—This sampling method should be con-
priate safety and health practices and determine the applica-
sidered in situations where very low yield is a consideration
bility of regulatory limitations prior to use.
and results from this sampling method should be scrutinized to
2. Referenced Documents confirm that they meet data quality objectives (DQOs) and the
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work plan objectives.
2.1 ASTM Standards:
3.1.3 passive sampling—the collection of ground-water
D 4750 Test Method for Determining Subsurface Liquid
quality data so as to induce no hydraulic stress on the aquifer.
Levels in a Borehole or Monitoring Well (Observation
3.1.4 water quality indicator parameters—refer to field
Well)
monitoring parameters that include but are not limited to pH,
specific conductance, dissolved oxygen, oxidation-reduction
potential, temperature, and turbidity that are used to monitor
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This guide is under the jurisdiction of ASTM Committee D34 on Waste
the completeness of purging.
Management and is the direct responsibility of Subcommittee D34.01.02 on
Sampling Techniques.
4. Summary of Guide
Current edition approved Aug. 10, 2001. Published November 2001. Originally
published as D 4448–85. Last previous edition D 4448–85a (1992).
4.1 The equipment and procedures used for sampling a
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
monitoring well depend on many factors. These include, but
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
are not limited to: the design and construction of the well, rate
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. of ground-water flow, and the chemical species of interest.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4448–01
Sampling procedures may be different if analyses for trace organics are different from those to be taken in sampling for
organics,
...

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