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Groundwater Monitoring Statistics
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The March 2009 Unified Guidance document provides guidance for the statistical analysis of groundwater monitoring data from RCRA facilities. It updates and replaces the earlier 1989 Interim Final Guidance and the July 1992 Addendum. Three documents which are part of the 2009 guidance are also found below.
- March 2009 Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities—Unified Guidance (PDF) (884 pp, 6.6 MB) (Complete Document)
- Table of Contents (PDF) (12 pp, 129K)
- Part I: Statistical Design and Philosophy (PDF) (198 pp, 1.6MB)
- Part II: Diagnostic Methods and Testing (PDF) (148 pp, 1.4MB)
- Part III: Detection Monitoring Tests (PDF) (138 pp, 1.2MB)
- Part IV: Compliance/Assessment and Corrective Action Tests (PDF) (58 pp, 444K)
- Appendices (PDF) (330 pp, 1.9MB)
- Fact Sheet for the March 2009 Unified Guidance (PDF) (4 pp, 57K)
- Optimal Rank Calculator for Non-Parametric Prediction Limits* (VisualBasic6, 460K)
*Note: Some anti-virus computer software may not accept this calculator in .exe format. Please contact the EPA Program Information and Implementation Division for a hard copy. - Narrative for development and use of the Optimal Rank Calculator (PDF) (28 pp, 340K)
Supporting Documentation for the Unified Guidance
Following release of the 2004 draft version of the Unified Guidance, numerous comments were received from states and other interested parties. In 2005, three national peer review experts provided detailed comments on the draft. For your information, the peer reviewer comments and an EPA Responsiveness Summary to these and other major concerns are found below.
- Peer Reviewer Comments(PDF) (112 pp, 616K)
- EPA Responsive Summary to Peer and Other 2004 draft Unified Guidance Comments (PDF) (57 pp, 284K)
GRITS/STAT Software
The U.S. Environmental Protection Agency no longer supports this software.
