ASTM D6725/D6725M-16
(Practice)Standard Practice for Direct Push Installation of Prepacked Screen Monitoring Wells in Unconsolidated Aquifers
Standard Practice for Direct Push Installation of Prepacked Screen Monitoring Wells in Unconsolidated Aquifers
SIGNIFICANCE AND USE
5.1 This practice is intended to provide the user with information on the appropriate methods and procedures for installing prepacked screen monitoring wells by direct push methods. The monitoring wells may be used to obtain representative water quality samples for aqueous phase contaminants or other analytes of interest, either organic or inorganic (3, 6-8). The monitoring wells may also be used to obtain information on the potentiometric surface of the local aquifer and properties of the formation such as hydraulic conductivity or transmissivity.
5.2 Use of direct push methods to install monitoring wells can significantly reduce the amount of potentially hazardous drill cuttings generated during well installation at contaminated sites. This may significantly reduce cost of an environmental site investigation and groundwater monitoring program. Minimizing generation of hazardous waste also reduces the exposure hazards to site workers, local residents, and the environment.
5.3 Direct push methods for monitoring well installation are limited to use in unconsolidated formations such as alluvial/stream sediments, glacial deposits, and beach type sediments. Direct push methods are generally successful at penetrating clays, silts, sands and some gravel. Deposits such as soils with thick caliche layers, or glacial tills with large cobbles or boulders may be difficult or impossible to penetrate to the desired depth. Direct push methods are not designed for penetration of consolidated bedrock such as limestone, granite or gneiss.
Note 1: The quality of the result produced by this standard is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies that meet the criteria of Practice D3740 are generally considered capable of competent and objective testing/sampling/inspection/etc. Users of this standard are cautioned that compliance with Practice D3740 does not in itself assure reliable results. Rel...
SCOPE
1.1 This practice is based on recognized methods by which direct push monitoring wells may be designed and installed for the purpose of detecting the presence or absence of a contaminant, and collecting representative groundwater quality data. The design standards and installation procedures herein are applicable to both detection and assessment monitoring programs for facilities.
1.2 The recommended monitoring well design, as presented in this practice, is based on the assumption that the objective of the program is to obtain representative groundwater information and water quality samples from aquifers. Monitoring wells constructed following this practice should produce relatively turbidity-free samples for granular aquifer materials ranging from gravels to silty sand.
1.3 Direct push procedures are not applicable for monitoring well installation under all geologic and soil conditions (for example, installation in bedrock). Other rotary drilling procedures are available for penetration of these consolidated materials for well construction purposes (Guide D5092). Additionally, under some geologic conditions it may be appropriate to install monitoring wells without a filter pack (1, 2)2. Guide D6724 may be referred to for additional information on these and other methods for the direct push installation of groundwater monitoring wells.
1.4 The values stated in either inch-pound units or SI units presented in brackets are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026, unless superseded by this standard.
1.6 This standard does not purport to address all of the safety co...
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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.
Designation: D6725/D6725M − 16
Standard Practice for
Direct Push Installation of Prepacked Screen Monitoring
1
Wells in Unconsolidated Aquifers
This standard is issued under the fixed designation D6725/D6725M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.1 This practice is based on recognized methods by which
responsibility of the user of this standard to establish appro-
direct push monitoring wells may be designed and installed for
priate safety and health practices and determine the applica-
the purpose of detecting the presence or absence of a
bility of regulatory limitations prior to use.
contaminant,andcollectingrepresentativegroundwaterquality
1.7 This practice offers a set of instructions for performing
data. The design standards and installation procedures herein
one or more specific operations. This document cannot replace
are applicable to both detection and assessment monitoring
education or experience and should be used in conjunction
programs for facilities.
with professional judgement. Not all aspects of this practice
1.2 The recommended monitoring well design, as presented
may be applicable in all circumstances. This ASTM standard is
inthispractice,isbasedontheassumptionthattheobjectiveof
not intended to represent or replace the standard of care by
the program is to obtain representative groundwater informa-
which the adequacy of a given professional service must be
tionandwaterqualitysamplesfromaquifers.Monitoringwells
judged, nor should this document be applied without consid-
constructed following this practice should produce relatively
eration of the project’s many unique aspects. The word
turbidity-free samples for granular aquifer materials ranging
“Standard” in the title of this document means only that the
from gravels to silty sand.
document has been approved through the ASTM consensus
1.3 Direct push procedures are not applicable for monitor-
process.
ing well installation under all geologic and soil conditions (for
example, installation in bedrock). Other rotary drilling proce-
2. Referenced Documents
dures are available for penetration of these consolidated
3
2.1 ASTM Standards:
materials for well construction purposes (Guide D5092).
D653 Terminology Relating to Soil, Rock, and Contained
Additionally, under some geologic conditions it may be appro-
Fluids
2
priate to install monitoring wells without a filter pack (1, 2) .
D1586 Test Method for Penetration Test (SPT) and Split-
Guide D6724 may be referred to for additional information on
Barrel Sampling of Soils
these and other methods for the direct push installation of
D3740 Practice for Minimum Requirements for Agencies
groundwater monitoring wells.
Engaged in Testing and/or Inspection of Soil and Rock as
1.4 The values stated in either inch-pound units or SI units
Used in Engineering Design and Construction
presented in brackets are to be regarded separately as standard.
D4043 Guide for Selection of Aquifer Test Method in
The values stated in each system may not be exact equivalents;
Determining Hydraulic Properties by Well Techniques
therefore,eachsystemshallbeusedindependentlyoftheother.
D4044 Test Method for (Field Procedure) for Instantaneous
Combining values from the two systems may result in non-
Change in Head (Slug) Tests for Determining Hydraulic
conformance with the standard.
Properties of Aquifers
D4104 Test Method (Analytical Procedure) for Determining
1.5 All observed and calculated values shall conform to the
Transmissivity of Nonleaky Confined Aquifers by Over-
guidelines for significant digits and rounding established in
damped Well Response to Instantaneous Change in Head
Practice D6026, unless superseded by this standard.
(Slug Tests)
1
D4448 Guide for Sampling Ground-Water Monitoring Wells
This practice is under the jurisdiction of ASTM Committee D18 on Soil and
Rock and is the direct responsibility of Subcommittee D18.21 on Groundwater and
Vadose Zone Investigations.
Current edition approved July 15, 2016. Published August 2016. Originally
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approved in 2001. Last previous edition approved in 2010 as D6725–04(2010). For referenced ASTM standards, visit the ASTM website, www.astm.org, or
DOI: 10.1520/D6725_D6725M-16. contactASTM Customer Service at service@astm.org. ForAnnual Book ofASTM
2
The boldface numbers in parent
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D6725 − 04 (Reapproved 2010) D6725/D6725M − 16
Standard Practice for
Direct Push Installation of Prepacked Screen Monitoring
1
Wells in Unconsolidated Aquifers
This standard is issued under the fixed designation D6725;D6725/D6725M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope Scope*
1.1 This practice is based on recognized methods by which direct push monitoring wells may be designed and installed for the
purpose of detecting the presence or absence of a contaminant, and collecting representative groundwater quality data. The design
standards and installation procedures herein are applicable to both detection and assessment monitoring programs for facilities.
1.2 The recommended monitoring well design, as presented in this practice, is based on the assumption that the objective of the
program is to obtain representative groundwater information and water quality samples from aquifers. Monitoring wells
constructed following this practice should produce relatively turbidity-free samples for granular aquifer materials ranging from
gravels to silty sand. Strata having grain sizes smaller than the recommended design for the smallest diameter filter pack materials
should be monitored by alternative monitoring well designs which are not addressed in this practice.
1.3 Direct push procedures are not applicable for monitoring well installation under all geologic and soil conditions (for
example, installation in bedrock). Other rotary drilling procedures are available for penetration of these consolidated materials for
well construction purposes (Guide D5092). Additionally, under some geologic conditions it may be appropriate to install
2
monitoring wells without a filter pack (EPA(1, 21991).) . Guide D6724 may be referred to for additional information on these and
other methods for the direct push installation of groundwater monitoring wells.
1.4 The values stated in either inch-pound units or SI units presented in brackets are to be regarded separately as standard. The
values in parentheses are for information only.stated in each system may not be exact equivalents; therefore, each system shall be
used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice
D6026, unless superseded by 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 and health practices and determine the applicability of regulatory
limitations prior to use.
1.7 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 judgement. 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 the
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.
2. Referenced Documents
3
2.1 ASTM Standards:
D1452D653 Practice for Soil Exploration and Sampling by Auger BoringsTerminology Relating to Soil, Rock, and Contained
Fluids
D1587D1586 Practice for Thin-Walled Tube Sampling of Fine-Grained Soils for Geotechnical PurposesTest Method for
1
This practice is under the jurisdiction of ASTM Committee D18 on Soil and Rock and is the direct responsibility of Subcommittee D18.21 on Groundwater and Vadose
Zone Investigations.
Current edition approved July 1, 2010July 15, 2016. Published September 2010August 2016. Originally approved in 2001. Last previous edition approved in 20042010
as D6725D6725–04(2010).–04. DOI: 10.1520/D6725-04R10.10.1520/D6725_D6725M-16.
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The boldface numbers in parentheses refer to a list of references at the end of this standard.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at se
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