Science & Technology

This page shows all of the pages at www.epa.gov that are tagged with Science & Technology.

  • ARP Enhanced Air Quality Monitoring for Communities - Competitive Grant

    ARP competitive grant- enhanced air quality monitoring for communities

  • Selections for the ARP Enhanced Air Quality Monitoring Competitive Grant

    List of selections for the Enhanced Air Quality Monitoring for Communities competitive grant (RFA# EPA-OAR-OAQPS-22-01)

  • Vapor Recovery Units

    Vapor recovery units (VRUs) are commonly used to capture methane emissions from storage tanks and a variety of other low pressure sources such as pipeline pigging operations, compressors, and dehydrators.

  • Centrifugal Compressors

    A centrifugal compressor is used to increase the pressure of natural gas in pipelines. Centrifugal compressors contain rotating shafts that require seals to prevent the high-pressure natural gas from escaping the compressor casing.

  • Route Blowdown Gas to Low Pressure System

    Rerouting blowdown gas (from stations, equipment, or pipelines) to an existing low-pressure gas system can reduce the amount of high-pressure natural gas that would otherwise be emitted to the atmosphere.

  • Reroute Glycol Skimmer Gas

    Some glycol dehydrators use condensate separators to recover natural gas liquids and the non-condensable gas (or skimmer gas) is often vented to the atmosphere. Rerouting the skimmer gas to the reboiler firetubes can reduce emissions.

  • Pipeline Blowdowns

    Pipeline blowdowns are routine operations on transmission and distribution systems to allow operators to safely perform maintenance. This practice involves isolating and depressurizing a section of the pipeline and venting the gas to the atmosphere.

  • Pneumatic Controllers

    Natural gas-powered pneumatic controllers are used in the natural gas industry to operate valves that control liquid level, pressure, and other processes. Some controllers are designed to bleed continuously, while others may bleed gas only when actuated.

  • Liquids Unloading

    Accumulation of liquids (i.e., water and hydrocarbons) in a mature gas well can slow down gas production. To increase gas production, the liquids must be cleared from the well. Removing the liquids is commonly referred to as “liquids unloading.”

  • Basic Information

    NHDPlus is a geospatial, hydrologic framework dataset that is intended for use by geospatial analysts and modelers to support water resources related applications. NHDPlus was developed by the USEPA in partnership with the US Geologic Survey

  • In-Situ Bioremediation of Contaminated Ground Water

    This document is one in a series of Ground Water Issue papers which have been prepared in response to needs expressed by the Ground Water Forum. It is based on findings from the research community in concert with experience gained at sites undergoing ...

  • Performance Evaluations of Pump-and-Treat Remediations

    Recent research has led to a better understanding of the complex chemical and physical processes controlling the movement of contaminants through the subsurface, and the ability to pump such contaminants...

  • Contaminant Transport in Fractured Media: Models for Decision Makers

    This paper summarizes the current status of modeling ground-water flow and contaminant transport in fractured rock systems.

  • Facilitated Transport

    Facilitated transport is an issue identified by the forum as a concern of Superfund decision-makers. Any process that has the potential to speed the transport of a pollutant beyond ...

  • Accuracy of Depth to Water Measurements

    Accuracy of depth to water measurements is an issue identified by the Forum as a concern of Superfund decision-makers as they attempt to determine directions of ground-water flow, areas of recharge or discharge, the hydraulic characteristics of...

  • Ground Water Sampling for Metal Analyses

    Filtration of ground-water samples for metals analysis is an issue identified by the Forum as a concern of Superfund decision-makers. Inconsistency in EPA Superfund cleanup ractices occurs where one EPA Region implements a remedial action based on...

  • Basic Concepts of Contaminant Sorption at Hazardous Waste Sites

    This paper summarizes the basic concepts of sorption in soil and ground water with emphasis on nonpolar organic contaminants.

  • Characterizing Soils for Hazardous Waste Site Assessment

    Soil characterization at hazardous waste sites

  • Dense Nonaqueous Phase Liquids

    This issue paper is a literature evaluation focusing on DNAPLs and provides an overview from a conceptual fate and transport point of view of DNAPL phase distribution, monitoring, site characterization, remediation, and modeling.

  • Reductive Dehalogenation of Organic Contaminants in Soils and Ground Water

    Reductive dehalogenation is a process which may prove to be of paramount importance in dealing with a particularly persistent class of contaminants often found in soil and ground water at superfund sites.

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