Exposure Investigation Workplan
LOWER ELWHA KLALLAM TRIBE SHELLFISH BEDS NEAR PORT ANGELES HARBOR
PORT ANGELES, CLALLAM COUNTY, WASHINGTON
December 13, 2002
Washington State Department of Health
Under a Cooperative Agreement with the
Agency for Toxic Substances and Disease Registry
TABLE OF CONTENTS
- Agency for Toxic Substances and Disease Registry (ATSDR):
- The principal federal public health agency involved with hazardous waste issues, responsible for preventing or reducing the harmful effects of exposure to hazardous substances on human health and quality of life. ATSDR is part of the U.S. Department of Health and Human Services.
- Any substance that can cause or contribute to the production of cancer.
- Comparison value:
- A concentration of a chemical in soil, air or water that, if exceeded, requires further evaluation as a contaminant of potential health concern. The terms comparison value and screening level are often used synonymously.
- Any chemical that exists in the environment or living organisms that is not normally found there.
- Contact with a chemical by swallowing, by breathing, or by direct contact (such as through the skin or eyes). Exposure may be short-term (acute) or long-term (chronic).
- Hazardous substance:
- Any material that poses a threat to public health and/or the environment. Typical hazardous substances are materials that are toxic, corrosive, ignitable, explosive, or chemically reactive.
- Soil, water, air, plants, animals, or any other part of the environment that can contain contaminants.
- Compounds composed of carbon, including materials such as solvents, oils, and pesticides which are not easily dissolved in water.
- Parts per trillion (ppt)/Parts per million (ppm):
- Units commonly used to express low concentrations of contaminants. For example, 1 ounce of trichloroethylene (TCE) in 1 million ounces of water is 1 ppm. 1 ounce of TCE in 1 trillion ounces of water is 1 ppt.
- Remedial investigation:
- A study designed to collect the data necessary to determine the nature and extent of contamination at a site.
- Volatile organic compound (VOC):
- An organic (carbon-containing) compound that evaporates (volatilizes) easily at room temperature. A significant number of the VOCs are commonly used as solvents.