EP 1110-1-18
24 Apr 00
(c) Man-made features, such as utilities.
(d) Past, current and future land use.
(2) Ordnance Penetration. When planning geophysical investigations for buried UXO, it is
necessary to consider possible depth of UXO. If UXO is intentionally buried, factors affecting
burial depth may include type of soil, mechanical versus hand-excavation, depth of water table,
etc. If the munition was fired or dropped, then the depth of penetration can be estimated by
considering soil type, munition type and weight, and impact velocity. Penetration depths may be
estimated using a Maximum Ordnance Penetration source document such as the nomograph
found in Figure 4-8 of TM 5-855-1, Fundamentals of Design for Conventional Weapons. There
are many cases where UXO can penetrate deeper than geophysical instruments can reliably
detect. On such sites, it is possible that undetected UXO remains deeper than it can be detected.
(3) OE Instrument Detection Rates. Detection rates are always site-specific and are highly
dependent upon the type of ordnance at the site, how the ordnance was used, how deeply it may
be buried, environmental conditions, and cultural influences. Previous test results have shown
that, regardless of the particular detector system tested, the best detection systems utilize
computer-based post processing to assist data evaluation and target selection.
(4) OE Detection Instrument Performance.
(a) The performance of OE detection instruments varies as a result of different
characteristics such as soil type, moisture content, depth to groundwater, vegetation, and type of
OE. The number of environmental and OE factors affecting the performance of OE detection
instruments are so numerous that a test of various potential OE detection instruments should be
performed on the site to determine which instrument performs the best.
(b) The purpose of OE instrument testing is to:
Document the consideration given to various OE detection instruments for use at a
project site, the criteria used to identify geophysical instruments for consideration, and
the causes for their respective selection or rejection.
Document the capabilities and limitation of each OE detection instrument selected for
consideration at the site-specific geophysical prove-out.
Observe each OE detection instrument operating in the contractor's configuration, using
the contractor's personnel and methodologies at the project site operating as a unit.
Evaluate the contractor's data collection, data transfer quality, data quality control
method(s), and data transfer rates.
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