Science & Technology

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

  • Appendix F2 - EDR Summary of Hercules, Inc.

    EDR Identified Public Supply Wells - Regulatory agency database searches and the information obtained is summarized.

  • Memorandum to Timothy Hassett, Hercules Incorporated dated Oct 3, 2008

    Memorandum dated October 3, 2008 from Eco-Systems, Inc. to Hercules, Incorporated in Hattiesburg, Mississippi about Sludge Sample Analyses

  • TestAmerica Analytical Report of Hercules, Inc. site

    Analytical report of Hercules, Inc site in Hattiesburg, MS, prepared by TestAmerica Laboratories, Inc., Aug. 25, 2011. Job ID 680-70818-1

  • Appendix A EPA Approval of the former Chemical Plan

    Interim Measures Work Plan Letter dated April 16, 2012

  • Revised Quality Assurance Project Plan (QAPP) for Hercules, Inc.

    Revised Quality Assurance Project Plan (QAPP) for Hercules, Inc. in Hattiesburg, MS prepared by Arcadis, Nov. 30, 2011. USEPA RCRA 3013(a) Administrative Order, EPA ID No. MSD 008 182 081, Docket No. RCRA-04-2011-4251, MDEQ AI No. 2022

  • TSC Science Priorities

    Learn about EPA Tribal Science Council science priorities.

  • Indicators: Conductivity

    Conductivity is a measure of the ability of water to pass an electrical current. Because dissolved salts and other inorganic chemicals conduct electrical current, conductivity increases as salinity increases.

  • Indicators: Atrazine

    Atrazine is an herbicide widely used for control of broadleaf and grassy weeds. It is sprayed on row crops such as corn, sorghum and sugarcane, and in some areas is used on residential lawns. It also been used on highway and railroad rights-of-way.

  • EcoRisk Portal

    The EcoRisk Portal provides access to EPA’s ecological risk assessment authorities, regulations, policy, guidance, training, and technical resources.

  • Indicators: Zooplankton

    Zooplankton are small, free-floating aquatic microorganisms including crustaceans, rotifers, open water insect larvae, and aquatic mites. The zooplankton community is composed of both primary consumers and secondary consumers.

  • Indicators: Sediment Diatoms

    Diatoms are a type of algae that are typically abundant in marine and freshwater ecosystems. They have inorganic cell walls made up of silica (glass). Diatoms most commonly grow suspended in water, although they can also attach to substrates.

  • Indicators: Phytoplankton

    Phytoplankton are free-floating, microscopic algae that inhabit the sunlit, upper layer of most freshwater and marine environments. They are usually responsible for the color and clarity of lakes, wetlands, rivers, streams and estuaries.

  • Indicators: Fish Assemblage

    Fish assemblage refers to the variety and abundance of fish species in a given waterbody. Fish are sensitive indicators of physical and chemical habitat degradation, environmental contamination, migration barriers, and overall ecosystem productivity.

  • Indicators: Wetland Vegetation (Introduced Species)

    Introduced plants are indicators of the ecological integrity of waters and evidence of increased human-caused disturbance in the watershed. Introduced species that cause economic or environmental harm, or harm to human health, are called invasive species.

  • Indicators: Wetland Vegetation (Plant Community)

    Wetland vegetation specifically grows in water or is adapted to a growing in soil that is at least periodically flooded with water. These wetland plants are also referred to as “hydrophytes.”

  • Region 10: Risk Assessment Contacts

    Region 10 public points of contact, resources and research publications related to risk assessment.

  • Integrated Science Assessment - Final Reports

    Publications

  • Exposure Factors Handbook Chapter 9

    Exposure Factors Handbook: 2011 Edition and 2018 Update. The Exposure Factors Handbook provides information on various physiological and behavioral factors commonly used in assessing exposure to environmental chemicals.

  • Indicators: Chlorophyll a

    Chlorophyll allows plants (including algae) to photosynthesize, i.e., use sunlight to convert simple molecules into organic compounds. Chlorophyll a is the predominant type of chlorophyll found in green plants and algae.

  • Indicators: Benthic Macroinvertebrates

    Benthic (meaning “bottom-dwelling”) macroinvertebrates are small aquatic animals and the aquatic larval stages of insects. Benthic macroinvertebrates are commonly used as indicators of the biological condition of waterbodies.