Science & Technology
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PEST - Model-Independent Parameter Estimation Manual (4th Ed.)
A manual for using PEST, a model-independent parameter optimiser, to calibrate models and interpret field and laboratory data. 4th Edition
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A Exercise in Using PEST to Calibrate a Groundwater Model
Exercise to gain experience in using the comprehensive model postprocessing functionality available through Time Series PROCessor (TSPROC) & PEST in calibrating a HSPF model.
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Burlington Northern Santa Fe Railroad – West Burlington Facility, West Burlington, Des Moines County, Iowa - Fact Sheet, May 2022
Final Decision/Response to Comments
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Great Plains and Midwest Harmful Algal Blooms Conference
A workshop with the goal of developing a shared understanding of best practices for preventing harmful algal blooms in an agricultural dominated landscape, protecting source water quality, making connections and identifying shared HAB related goals, needs,
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Meet EPA Researcher Nick Dugan
The researchers at work profile for Nick Dugan
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The Clean Air Act: Solving Air Pollution Problems with Science and Technology
The Act calls for states and EPA to solve multiple air pollution problems through programs based on the latest science and technology information.
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Borehole Deviation
Borehole Deviation
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Borehole Caliper
Borehole Caliper
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Borehole Vertical Seismic Profiling (VSP)
Borehole Vertical seismic profiling (VSP)
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Neutron Borehole Logging
Borehole Neutron Density
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Electrical Resistivity
Surface electrical resistivity surveying is based on the principle that the distribution of electrical potential in the ground around a current-carrying electrode depends on the electrical resistivities and distribution of the surrounding soils and rocks.
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IRIS Recent Additions
Users can find notifications of detailed changes to IRIS website over the years.
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IRIS Program Outlook
This page describes assessments that are in development and projected public milestone dates.
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Prioritization of Toxics in the Columbia River
List of highest priority toxic contaminants in the Columbia River.
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Designation and NAAQS Information Related to the 1-Hour Ozone (1979 Standard) - NAAQS Revoked
Designation and NAAQS Information Related to the 1-Hour Ozone (1979 Standard) - NAAQS Revoked
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Green Book Frequent Questions
Green Book Frequently Asked Questions
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Near Road Monitoring
Information on the near road monitoring network
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Community-Scale Air Toxics Ambient Monitoring (CSATAM)
Webpage for the PAMS monitoring network containing information on background, methods, QA, and other resources.
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From Brownfield to Breadbasket: Health Impact Assessments Help Communities Make Healthy Decisions
PA is helping officials in Dover, Delaware, make decisions about the site by conducting a rapid Health Impact Assessment, an approach for identifying how a proposed policy or project might impact the health of a community.
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Meet EPA Environmental Engineer Terra Haxton, Ph.D.
EPA Environmental Engineer Terra Haxton, Ph.D., uses computer simulation models to protect drinking water. She investigates approaches to help water utilities be better prepared to respond to contamination incidents in their distribution systems.