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ASTM D 5092 Document Information:
Title
Standard Practice for Design and Installation of Ground Water Monitoring Wells
ASTM International
Publication Date:
Jan 1, 2004
Scope:
This practice describes a methodology for designing and installing
conventional (screened and
filter-packed) ground-water monitoring wells suitable for formations
ranging from unconsolidated
aquifers (i.e., sands and gravels) to granular materials having
grain-size distributions with up to
50 % passing a #200 sieve and as much as 20 % clay-sized material
(i.e., silty fine sands with
some clay). Formations finer than this (i.e., silts, clays, silty
clays, clayey silts) should not
be monitored using conventional monitoring wells, as representative
ground-water samples, free of
artifactual turbidity, cannot be assured using currently available
technology. Alternative
monitoring technologies (not described in this practice) should be
used in these formations
The recommended monitoring well design and installation procedures
presented in this practice are
based on the assumption that the objectives of the program are to
obtain representative
ground-water samples and other representative ground-water data from a
targeted zone of interest in
the subsurface defined by site characterization.
This practice, in combination with proper well development (D 5521),
proper ground-water sampling
procedures (D 4448), and proper well maintenance and rehabilitation (D
5978), will permit
acquisition of ground-water samples free of artifactual turbidity,
eliminate siltation of wells
between sampling events, and permit acquisition of accurate
ground-water levels and hydraulic
conductivity test data from the zone screened by the well. For wells
installed in fine-grained
formation materials (up to 50 % passing a #200 sieve), it is
generally necessary to use
low-flow purging and sampling techniques (D 6771) in combination with
proper well design to collect
turbidity-free samples.
This practice applies primarily to well design and installation
methods used in drilled boreholes.
Other Standards, including Guide D 6724 and Practice D 6725, cover
installation of monitoring wells
using direct-push methods.
The values stated in inch-pound units are to be regarded as standard.
The values in parentheses are
for information only.
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.
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. Nat 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 of this document
means only that the document has been approved through the ASTM
consensus process.
Keywords:
- aquifer
- borehole drilling
- geophysical exploration
- ground water
- monitoring well
- site investigation
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