Ordnance and Explosives Site Statistical Sampling Methodology (SiteStats)

Abstract

SiteStats/GridStats is a statistical sampling decision support tool that statistically characterizes the density of ordnance at FUD sites. SiteStats/GridStats was jointly developed by the Huntsville Division Corps of Engineers and QuantiTech Inc. This tool is designed to minimize the sampling requirements necessary to characterize Ordnance and Explosives (OE) contamination for a specified level of statistical confidence. The characterization includes a confidence interval and point estimate of contamination density using the hypergeometric probability distribution and the sequential probability ratio test. SiteStats is used to determine the ordnance density for the FUD site. GridStats (a submodule of SiteStats and a stand alone program) is used to determine the ordnance density for an individual grid. GridStats has significantly reduced the number of anomalies that must be investigated in a grid to determine the density of that grid. Under the current GridStats configuration, no more than 40% of anomalies have to be investigated to achieve statistical confidence of the density of the grid. Normally much less than 40% of the anomalies have to be investigated (on average 20-25%). SiteStats/GridStats uses sophisticated statistical techniques such as a sequential probability ratio test and clustering algorithms to both increase the statistical confidence and to decrease the data required to be investigated. SiteStats/GridStats is designed to be resident on a laptop computer, is used in the field by non-technical people and to be extremely user friendly. SiteStats/GridStats has been used at numerous FUD sites and has saved the Government significant amounts of money in the investigation stage of the Engineering Evaluation and Cost Analysis phase and has led to the development of much more accurate ordnance density estimates for the sites (the ordnance density is required to determine the public risk inherent at the site).

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1996
Accession Number
ADA509676

Entities

People

  • Arkie Fanning
  • Jeffrey L. Riggs

Tags

Communities of Interest

  • Counter IED
  • Human Systems

DTIC Thesaurus Topics

  • Algorithms
  • Army
  • Basic Programming Language
  • Computer Programs
  • Computers
  • Costs
  • Engineering
  • Explosives
  • Governments
  • Laptop Computers
  • Munitions
  • Probability
  • Probability Distributions
  • Sampling
  • Statistical Sampling
  • Test Methods
  • Unexploded Ammunition

Readers

  • Aerospace Research.
  • Environmental Remediation and Restoration.
  • Statistical inference.