Science & Technology
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EcoRisk Portal
The EcoRisk Portal provides access to EPA’s ecological risk assessment authorities, regulations, policy, guidance, training, and technical resources.
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Surface and Source Water Tools
Surface and Source Water Tools
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Water Quality Standards Tools for Tribes
This website provides tools to assist tribes with the adoption of new or revised water quality standards developed under the Clean Water Act.
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Inter-Agency Engagement on Nutrient Reduction
Information related to Inter-Agency Engagement on Nutrient Reduction.
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Water Quality Trading Memorandums
Information related to Water Quality Trading Memorandums.
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EPA’s Water Quality Trading Policy: Promoting Market-Based Mechanisms for Improving Water Quality
Final presentation slides from EPA’s March 5, 2019 webinar on the memo: Updating EPA’s Water Quality Trading Policy to Promote Market-Based Mechanisms for Improving Water Quality. This memo seeks to modernize the agency’s water quality trading policies
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TRI Relative Risk-Based Environmental Indicators: Interim Toxicity Weighting Summary Document, June 1997
This document provides the methodology and preliminary results for the chronic exposure human health toxicity weights used in the Indicators project
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Methodology Document for RSEI Model Version 2.1.5, October 2007
This methodology document accompanies version 2.1.5 of the Risk-Screening Environmental Indicators model.
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Risk-Screening Environmental Indicators (RSEI) Methodology
Risk-Screening Environmental Indicators (RSEI) Methodology
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Developing the Risk-Screening Environmental Indicators
Describes options considered during the development of the Risk-Screening Environmental Indicators screening model
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Methodology Document for RSEI Model Version 2.1, January 2004
This methodology document accompanies version 2.1 of the Risk-Screening Environmental Indicators model.
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Methodology Document for RSEI Model Version 2.1.2, August 2004
This methodology document accompanies version 2.1.2 of the Risk-Screening Environmental Indicators model.
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RSEI Version 2.1 Distribution Package
Information distributed to users in technical release of RSEI Version 2.1
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Estimate of Stack Heights and Exit Gas Velocities for TRI Facilities in OPPT's Risk-Screening Environmental Indicators Model, June 1999
This document describes the methods used to estimate stack heights and exit gas velocities for TRI facilities
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TRI Relative Risk-Based Environmental Indicators Methodology, June 1997
This report explains how the proposed Indicators are constructed, and includes discussions of the conceptual methodology, data sources, and the computational approach.
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Joint US EPA ASPECT and 64th CST Chemical and Radiological Field Exercise Report
This report covers a joint chemical and radiological field training exercise using EPA's ASPECT.
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User's Manual for OPPT's Risk-Screening Environmental Indicators Model: Version 1.0, November 1999
This manual describes the Indicator methodology, operations of the computer model and the step-by-step processes to perform them, and pre-run queries available with the model.
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User's Manual for RSEI Model Version 2.1, December 2002
This manual accompanies version 2.1 of the Risk-Screening Environmental Indicators model.
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User's Manual for RSEI Model Version 2.1.2, August 2004
This manual accompanies version 2.1.2 of the Risk-Screening Environmental Indicators model.
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User's Manual for RSEI Model Version 2.1.5, September 2007
This manual accompanies version 2.1.5 of the Risk-Screening Environmental Indicators model