EP 1110-1-18
24 Apr 00
9-4. Site Characterization.
a. Overview.
(1) The purpose of an OE site characterization is to obtain surface and subsurface OE data
to characterize the site and to generate recommendations for the proposed OE response action.
This characterization should include data from any OE that has been located and/or disposed of
by EOD or local law enforcement. Potential sources for this data include the ASR, EOD records,
or local law enforcement records. The following types of data should be collected:
(a) Type(s) of OE.
(b) Location of OE.
(c) Density of OE.
(d) Penetration Depth.
(2) The components of the site characterization phase include:
(a) Implementation of the sampling methodology.
(b) OE Detection Instrument Testing, if not completed during the RECON task.
(c) Area preparation.
(d) Field sampling.
b. Statistical Tools. During an EE/CA site characterization, the following statistical tools
may be used to collect site-specific data: SiteStats/GridStats or UXO Calculator. Contact the OE
MCX for additional detail on these statistical tools.
(1) SiteStats/GridStats. SiteStats may be used during sampling efforts to aid in establishing
the boundaries of contaminated areas and estimating the density of contamination within an area.
SiteStats provides for sequential sampling procedures and a statistical determination of sampling
termination points. SiteStats accepts a small amount of uncertainty in characterizing individual
subareas (grids) in exchange for a much greater understanding of the contamination of the overall
site. GridStats provides a statistical sampling methodology for estimation of ordnance
contamination density within individual grids.
(2) UXO Calculator. The UXO Calculator is a statistical model for determining the
amount of UXO in a sector. The UXO Calculator assumes homogeneous OE contamination
within an identified area. It is used to determine statistical confidence intervals for UXO density
and to perform statistical tests concerning UXO densities.
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