Environment terminology · MLC-0121

Environment terms: D (1,538)

Page 1 of 4

Daily AverageArithmetic average of the hourly values measured in a 24-hour period.
Daily Block AverageArithmetic mean of all valid emission concentrations or parameter levels recorded when a unit is operating...
Daily Compliance MeasurementDaily measurements used to assess compliance with the maximum for any one day.
Daily Discharge1. The discharge of a pollutant measured during any 24-hour period that reasonably represents a calendar day...
Daily maximumThe highest allowable "daily discharge." May also be represented in the CFR as "Maximum for any 1 day"...
Daily Maximum LimitThe maximum allowable discharge of pollutant during a calendar day. Where daily maximum limitations are...
Daily SpreadManure management system component in which manure is routinely removed from a confinement facility and is...
Daily ValueAs applied to produced water effluent limitations and NSPS means the daily measurements used to assess...
Daily Values Average (30 Consecutive Days)1. Average of the daily values obtained during any 30 consecutive day period. [40 CFR 435.11 (CFR 2013)]
Dairy AnimalAnimals that produce milk used for human consumption
Dairy CowA bovine from which milk production is intended for human consumption, or is kept for raising replacement...
Dairy Herd ImprovementA specific testing plan which requires supervision and compliance with all official DHI rules.
Dairy Herd Improvement AssociationAn organization with programs and objectives intended to improve the production and profitability of dairy...
Dairy Herd Improvement RegistryA modification of the DHIA program to make milk production records acceptable by the specific dairy breed...
Dairy ProductFoods made from the milk of mammals.
Dairy SteerA neutered male of any of the dairy cattle breeds. The "dairy steers" are raised for meat production and...
Dam1. Mother or female parent in a pedigree, normally applies to cattle.
Dam FailureCatastrophic type of failure characterized by the sudden, rapid, and uncontrolled release of impounded water...
DamageAny deterioration or physical injury such that the internal structure (cohesion) is inadequate, or which has...
Damage Estimation ModelRepresentation of processes that estimate the damage caused by some environmental event.
Damage SeverityThe total amount of damaged material, categorized as: 1. Major - greater than or equal to 160 square feet or...
Damaged friable miscellaneous ACMFriable miscellaneous ACM which has deteriorated or sustained physical injury such that the internal...
Damaged Friable Miscellaneous Asbestos Containing MaterialFriable miscellaneous ACM which has deteriorated or sustained physical injury such that the internal...
Damaged Friable Surfacing Asbestos Containing MaterialFriable surfacing ACM which has deteriorated or sustained physical injury such that the internal structure...
Damaged or Significantly Damaged Thermal System Insulation Asbestos Containing MaterialThermal system insulation ACM on pipes, boilers, tanks, ducts, and other thermal system insulation equipment...
DamagesAs defined by section 1001 of the OPA means damages specified in section 1002(b) of the Act, and includes the...
Damp proofingSealing the foundation walls to prevent outside moisture from entering the basement, although not as tightly...
Damper1. Device that restricts airflow to modulate the flow rate.
DampersControls that vary airflow through an air outlet, inlet, or duct. A damper position may be immovable...
Damping OffIn damping-off, pathogens attack seeds soon after planting or attack roots of seedlings soon after...
DampproofingSealing the foundation walls to help prevent outside moisture from entering the basement.
DamsIssues regarding safety of dams and levees are entered into the RAINE database.
Danio rerioZebra (Fish)
Darcy's Law1. An empirically derived equation for the flow of fluids through porous media. It is based on the...
Dark-Spots DiseaseA coral disease characterized by darkly pigmented areas of tissue on stony corals.-At present, there is no...
DashboardA web-based interactive visualization tool that is a graphical interface to existing tools and data...
Data1. Documented information or evidence of any kind.
Data & Application Hosting Infrastructure Operations & MaintenanceActivities to support data and application hosting, including mainframe, supercomputer and central...
Data & ToolsModels, Methods, Maps, Data Files, Databases, Glossaries, Software, Tutorials, etc.
Data AccessThe provision of portal services, including identity management and access control, to provide access to...
Data Access Services (Publishing)Network publishing is a term that refers to using Exchange Network technologies, services and specifications...
DATA ADMINISTRATIONThe comprehensive management of an organization's data, such as by ensuring consistent definitions of data...
Data Administration & IntegrationManagement of Agency data standards for compliance with all applicable EPA and non-EPA requirements and...
Data Analysis1. The provision of applications and tools for decision support analytics on an enterprise basis. This...
Data AssessmentEvaluation of a set of data as to accuracy, completeness, relevance, etc.
DATA BASEIn electronic records, a set of data, consisting of at least one file or of a group of integrated files...
DATA BASE MANAGEMENT SYSTEMA software system used to access and retrieve data stored in a data base.
Data blockA logical grouping of data elements and other data blocks defined for the purposes of reporting data.
Data BreachThe unauthorized movement or disclosure of sensitive information to a party, usually outside the...
Data Call-InA part of the Office of Pesticide Programs (OPP) process of developing key required test data, especially on...
Data categoryThe category of emissions inventory data to be reported. The EIS data categories are: Facility Inventory...
Data CellsThe basic components of data tables (used for data storage and display) as opposed to tables that are used to...
Data Clarity and CompletenessOne of EPA's five Assessment Factors that describes the degree of clarity and completeness with which the...
Data Collection1. Activities to support the collection of business information from states, partners, stakeholders and...
Data Collection InstrumentA form or set of forms used to collect information for an evaluation. Forms may include interview...
Data Collection PlanA written document describing the specific procedures to be used to gather the evaluation information or...
Data CommunicationsActivities to operate and maintain conventional local area networks, metropolitan area networks, wide area...
Data Dictionary1. An organized collection of information about the definition, structure, and use of data in an organization.
Data Dispersion1. The variation between data values in a sample.
Data element1. In electronic records, a combination of characters or bytes referring to one separate item of information...
Data Element DictionarySee http://www.epa.gov/superfund/sites/ded/index.htm. The Data Element Dictionary (DED) is a table in which...
Data Evaluation RecordOPP's evaluation of data supporting registration of a pesticide. See also Science review, Cleared review.
Data ExchangeExchange Network term for any routine exchange of information between two or more network partners. Exchanges...
Data FabricationMaking up data or results.
DATA FIELDA specific area of an electronic record allocated for a particular category of data, usually one data...
DATA FILE1. In electronic records, an organized collection of data, usually arranged in logical records that are...
Data Gap1. Absence of any valid study or studies in the Agency's files which would satisfy a specific data...
data integrity1. Refers to security (i.e., the protection of information from unauthorized access or revision) to ensure...
Data ModelDescriptions of data structures and their contained elements that attempt to represent facts and knowledge in...
data objectivity1. A characteristic indicating whether information is being presented in an accurate, clear, complete, and...
Data of Known QualityData are of known quality when the qualitative and quantitative components associated with their derivation...
Data Poor ChemicalChemical substances about which there is not enough information to assess their potential to harm human...
DATA PROCESSINGSystematically performing a series of actions with data. May be done by manual, mechanical...
Data Quality1. The term data quality refers to all features and characteristics of data that bear on its ability to meet...
Data Quality ActAlso referred to as the Information Quality Act. This act was a short, two-sentence rider to a spending bill...
Data Quality Assessment1. The scientific and statistical evaluation of data to determine if data obtained from environmental...
Data Quality Indicator1. Precision, bias, representativeness, completeness, comparability, and sensitivity.
Data Quality Indicators1. The quantitative statistics and qualitative descriptors used to interpret the degree of acceptability or...
Data Quality Objective1. RAGS Volume I, Part A, Chapter 4 defines a DQO as "qualitative and quantitative statements to ensure that...
Data Quality Objective ApproachSet of approval criteria that must be met so that data from an alternative test method can be used in...
Data Quality Objective ProcessA systematic planning tool based on the scientific method that identifies and defines the type, quality, and...
Data Quality Objectives1. The qualitative and quantitative statements derived from the DQO Process that clarifies study's technical...
Data Quality Objectives Process1. A systematic planning tool to facilitate planning of environmental data collection activities. Data...
Data ReductionThe process of transforming the number of data items by arithmetic or statistical calculations, standard...
Data ReuseThe ability to generate the same results of an investigation when it is repeated by another person, or by...
Data Review1. A term with a different meaning to different persons. Clarification should be sought when this term is...
Data ScienceStudy of the methodology of extracting knowledge and insights from large and complex data sets, requiring...
Data ServiceA web service used to access data.
Data Set1. A group of related records that are organized and treated as a unit. Also used interchangeably with data...
Data SiloRepository of fixed data that remains under the control of one department and is isolated from the rest of...
Data Standard1. A data standard documents an agreement on representation, format, and definition for common data...
Data StovepipeData which operates in a standalone environment, is not shared with others and is not integrated with other...
Data Stream Information1. Information (i.e., messages and parameters) originated within the engine by a module or intelligent...
Data Submitters ListCurrent Agency list, entitled “Pesticide Data Submitters by Chemical,” of persons who have submitted data to...
Data Transformation1. Data transformation is a mathematical treatment which alters the measurement scale of the observations...
Data typeThe data format defined for a given data element. Common data types include string, integer, and date. EIS...
Data Uncertainty1. Uncertainty (see definition) that is caused by measurement errors, analytical imprecision and limited...
Data Universal Numbering SystemA unique, nine-digit series of numerals that identifies a business.
Data Usability1. The process of determining and ensuring that the quality of the data produced meets the intended use of...
data utility1. Refers to the usefulness of the information to the intended users. Data utility is one of the constituents...
Data Validation1. An analyte- and sample-specific process that extends the evaluation of data beyond method, procedural, or...
Data Verification1. The process of evaluating the completeness, correctness, and conformance/compliance of a specific data set...
Data VisualizationData visualization is a branch of bioinformatics that focuses on the graphical presentation of information...
Database1. A collection of information that has been systematically organized for easy access and analysis. Databases...
DataBase Systems SupportDataBase Systems Support group is a pool of resources that provides complete technical and consulting support...
DataflowAnother term used for "data exchange".
Data.govU.S. government website to increase public access to high value, machine readable datasets generated by the...
Data-Poor SituationA situation where there is not enough data to support a recommendation
Data-Rich SituationA situation where there is enough data to support a recommendation
Dataset1. The entire set of data submitted to the EIS by an S/L/T for an inventory year. An S/L/T nonpoint emissions...
Dataset GroupGroup of datasets that contain the same kind of data and usually the same format, but include records for...
Date For Public Notice On Proposed RemedyThe event by which the State or EPA provides notice to the public that a proposed remedy has been tentatively...
DATE OF COMPLETIONThe date on which all work under an award is completed or the date on the award document, or any supplement...
Date PostedThe date a document was posted to the Regulations.gov website.
Date Received1. Date the Administrator or a permitting authority comes into possession of information or correspondence...
Dateometer(day-TOM-uh-ter) A small calendar disc attached to motors and equipment to indicate the year in which the...
datumA quantity, or a set of quantities, that serves as a basis for the calculation of other quantities; in...
Daughter ProductsRadioactive atoms decay in an attempt to become more stable. The element that remains after the radioactive...
Day CabType of tractor cab that is not a sleeper cab.
Day Tank1. A tank used to store a chemical solution of known concentration for feed to a chemical feeder. A day tank...
DaylightingBuried streams under vacant lots or city parks could be dug up and restored to their natural above-ground...
Day-Night Sound Level24-hour time of day weighted equivalent sound level, in decibels, for any continuous 24-hour period, obtained...
DB2IBM's relational database system that runs under the MVS operating system
DBE(Relates to OSBDU)
DC/DC ConverterThis device converts higher-voltage DC power from the traction battery pack to the lower-voltage DC power...
DDT1. A group of colorless chemicals, no longer made today, that was used to kill insects. DDT is toxic to...
de micromis partyParty whose contribution is equal to or less than (1) 0.002% of total volume or 110 gallons (such as two...
De Minimis1. This is a Latin phrase which means "the law does not care about very small matters." In other words, the...
De Minimis Emission LevelWhen the total direct and indirect emissions resulting from a federal action are below the listed de minimis...
de minimis partyParty whose contribution of hazardous substances to a facility is minimal, both in terms of volume and...
De MinimusThe 10% de minimis indirect cost rate is a Federally-recognized rate that non-Federal entities may use to...
DeacetylationDeacetylation is the covalent chemical or post-translational biochemical addition of an acetyl group(s) to a...
Dead End1. The end of a water main which is not connected to other parts of the distribution system by means of a...
Dead MallA shopping mall that no longer does the retail business it was built to accommodate
Dead timeIn nuclear logging, dead time is the amount of time required for the system to be ready to count the next...
Dead zoneA condition where no oxygen is present in the water. Dead zones are often caused by the decomposition of...
DeadenerSpecialty coating applied to selected vehicle surfaces primarily for the purpose of reducing the sound of...
Deadener MaterialDeadener and thinner added to deadener.
deadmen1. Anchors drilled or cemented into the ground to provide additional reactive mass to DP sampling rigs. The...
Dealer Demonstration VehicleAny vehicle that is operated by a motor vehicle dealer (as defined in section 216(4) of the Act) solely for...
DeaminationThe removal of an amino group (NH2) from a chemical compound.
DeathLack of reaction of a test organism to gentle prodding.
Death CertificateCertified document issued by either a medical practitioner or a governmental agency that details the date...
Debris1. A broad category of large manufactured and naturally occurring objects that are commonly discarded (e.g...
Debris FlowA type of landslide made up of a mixture of water-saturated rock debris and soil with a consistency similar...
Debris ManagementPlans addressing disposal of materials, including vegetative, construction and demolition, hazardous or...
Debris Removal ScreenCoarse screening used to capture larger pieces of trash.
DebtAmount owed to the United States from sources which include loans insured or guaranteed by the United States...
Debt PaymentThe dollar amount that must be paid each year toward paying down or retiring existing debt.
Debt ServiceThe amount of principal and interest due on a loan in a given time period, typically the current year.
Debt Service Coverage Ratio1. DSCR = Debt Service Coverage Ratio = Net Income / Total Debt
Debt WaiverCancellation, remission, forgiveness or non-recovery of a debt or debt-related charge as permitted or...
DebtorIndividual, organization, association, corporation, or a State or local government indebted to the United...
DebugThe identification and removal of bugs from computer code. Bugs are errors in computer code that range from...
Debugging1. The process of detecting and eliminating mistakes in computer programs or other software. Also called...
Decant1. To draw off the upper layer of liquid (water) after the heavier material (a solid or another liquid) has...
DecarbonizationProcess of reducing the amount of GHG emissions, specifically carbon dioxide with a goal of zero by limiting...
DecarboxylationThe removal of a carboxyl group, usually in the form of carbon dioxide, from a chemical compound.
Decarburization VesselAny vessel used to further refine molten steel with the primary intent of reducing the carbon content of the...
Decay1. The gradual decrease in the amount of a given substance in a given system due to various sink processes...
Decay Chain1. The series of decays or transformations that radionuclides go through before reaching a stable form. For...
Decay FungusTwo major kinds of decay fungi are recognized: brown rot and white rot. White-rot fungi remove both lignin...
Decay Product1. Isotope formed by the radioactive decay of some other isotope. This newly formed isotope possesses...
Decay Products1. Degraded radioactive materials, often referred to as "daughters" or "progeny"; radon decay products of...
Decayed WoodWood that has been rotted or decomposed by fungi.
DecentralizeForcing a logging probe against one side of the drill hole.
Decentralized System1. An onsite or clustered system used to collect, treat, and disperse or reclaim wastewater from a small...
Decentralized Wastewater TreatmentDecentralized solution which treats and disperses wastewater as close as possible to its source, uses the...
Deceptive ImprintingRefers to a mechanism leading to a fixed state of immunity that fails to adapt to a changing pathogen and has...
DecharacterizeTreat a characteristic waste so that it no longer exhibits a characteristic property. For characteristic...
Dechlorination1. Removal of chlorine and chemical replacement with hydrogen or hydroxide ions to detoxify a substance.
Decibel1. (DES-uh-bull) A unit for expressing the relative intensity of sounds on a scale from zero for the average...
Deciduous PlantPlants having structures that are shed at regular intervals or at a given stage in development, such as trees...
Deciduous treesTrees such as oaks and maples that lose their leaves during part of the year. See coniferous trees.
DeciliterOne-tenth of a liter (0.1 liter).
DECIMAL FILING SYSTEMA system for classifying records by subject, developed in units of 10 and coded for arrangement in numerical...
Decision Analysis1. Application of quantitative methods to decision-making.
Decision Analysis MetricParameter measuring the performance of a variable in decision analysis.
Decision Analysis ToolIn decision analysis that instrument used to identify, assess, and represent important features of a decision.
Decision ContextA comprehensive description of the circumstances surrounding the decision being made (or anticipated...
Decision CriteriaDecision criteria, or factors, that are specific measures used to assess the Decision/Management Alternatives.
decision maker1. Individual(s) or groups of people responsible for making choices or determining policy that impacts the...
decision making process1. One of any social and mental processes leading to the selection of a course of action among several...
Decision ScienceBranch of knowledge employing mathematical methods to analyze complex problems to gain insight into the most...
Decision StakeholderPrimarily concerned with the problem, its impacts, representation of interests/ concerns, management scenario...
decision support framework1. An organizing structure to inform the decision making process. (modified from: ESRP Decision Support Theme)
Decision Support Platform1. The computer or operating system on which decision support software runs.
Decision Support SoftwareComputer programs used by decision-makers to help answer questions, solve problems, and support or refute...
decision support systemAn interactive computer-based system to aid decision makers in identifying and solving problems, and making...
Decision Support TechniqueMathematical or statistical procedures used as aids in making a decision. They are frequently used in medical...
decision support toolsSoftware, analysis methods, models, data sets, maps, etc. available to inform the decision making process...
Decision TheoryMathematics-based theory aimed at helping practitioners reach optimal decisions.
decision tree1. A hierarchy of rules within a computer program, represented by a tree-like structure, that enables a set...
Decisional BodyAny EPA employee who is or may reasonably be expected to act in a decision-making role in a proceeding under...
decision/management alternativeAn alternative policy or management option for action or inaction to accomplish a specific goal or objective...
Deciview Index1. Value for a day that is derived from calculated or measured light extinction, such that uniform increments...
Deck CoverDevice which covers an opening in a floating roof deck. Some deck covers move horizontally relative to the...
Deck DrainageAny waste resulting from deck washings, spillage, rainwater, and runoff from gutters and drains including...
Deck RunoffWater runoff from precipitation, freshwater washdowns, and seawater that falls on the exposed decks of a...
Decker SystemAll equipment used to thicken the pulp slurry or reduce its liquid content after the pulp washing system and...
Deckle edgeThe rough or feathered edge of paper when left untrimmed.
DeclarationAn enforceable attestation by a responsible authority within the manufacturer's organization that the product...
DeclarationsA term used in insurance for the portion of the contract (a.k.a., Dec Sheet or Dec Page) that contains...
DECLASSIFICATIONThe process or result of determining that information no longer requires classification for national security...
Declining-Block RatePricing structure for which the dollar amount charged per unit of water (such as dollars per gallon)...
Declutching/FreewheelingSome transmissions can disengage from the drive-shaft in the event the drive-shaft speed is greater than the...
DecoctionSubstance prepared by boiling
Decoking Operation1. Sequence of steps conducted at the end of the delayed coking unit's cooling cycle to open the coke drum to...
Decommission1. The process of removing a nuclear facility from service. This involves reducing residual radioactivity to...
Decomposer1. Organisms that help break down dead plants and animals for reuse.
Decomposition1. Metabolic breakdown of organic materials; the formation of by-products of decomposition releases energy...
Decomposition EmissionEmissions released from a polymer production process as the result of a decomposition or during attempts to...
Decomposition (Manufacturing)1. Dividing molecules by thermal and catalytic cracking.
Deconstruction1. The careful and systematic dismantling of a building structure to maximize the recovery of valuable...
Deconstruction DesignAlso called Design for Disassembly, is the design of buildings or products to facilitate future change and...
Decontamination1. Removal of harmful substances such as noxious chemicals, harmful bacteria or other organisms, or...
Decontamination EfficacyThe effectiveness of decontamination procedures for homeland security pracitces
Decontamination of Spore-Forming Microorganisms1. A process that eliminates or inactivates viable bioburden and any associated toxic material via the use of...
Decontamination (radioactive)The removal of radioactive material from a structure, object or person.
Decontamination Verification1. This phase involves monitoring decontamination processes to confirm decontamination has been conducted...
Decontamination Wastewater TreatmentA technology for treating wastewater generated from decontamination of sites contaminated by biological or...
Deconvolution1. A data processing technique applied to seismic reflection data to improve the detection and resolution of...
Decorative Chromium ElectroplatingProcess by which a thin layer of chromium (typically 0.003 to 2.5 microns) is electrodeposited on a base...
Decorative TinSingle-walled container, designed to be covered or uncovered that is manufactured from metal substrate equal...
Decreased Birth WeightLessened mass of infants at the time of birth as compared with others of the same gestational age.
Decreasing-Block Rate1. A pricing structure for which the dollar amount charged per unit of water (such as dollars per gallon)...
Dedicated LineA communications circuit or channel provided for the exclusive use of a particular subscriber. Dedicated...
Dedicated Pesticide Active Ingredient Process UnitPAI process unit constructed from equipment that is fixed in place and designed and operated to produce only...
Dedicated Pharmaceutical Manufacturing Process UnitPMPU that is composed of equipment that is used to manufacture the same product for a continuous period of 6...
Dedicated VehicleAny motor vehicle engineered and designed to be operated using a single fuel. Flexible fuel vehicles and...
Deduct When Referring to AllowancesPermanent withdrawal of allowances by the Administrator from an Allowance Tracking System compliance account...
DeductibleA threshold on a policy basis that the insured must pay for damages (i.e., insured loss) before an insurer...
Deductive Inference1. Inference from general principles to their consequences. Also see inductive inference and abductive...
DeedA signed and usually sealed instrument containing some legal transfer, bargain, or contract.
Deed NoticeCommonly refers to a non-enforceable, purely informational document filed in public land records that alerts...
Deed RestrictionNot a traditional property law term, but rather is used in the NCP as a shorthand way to refer to types of...
Deemed Savings1. An approach to estimating energy and demand savings, usually used with programs targeting simpler...
Deep Atmospheric ConvectionThermally driven turbulent mixing where vertical motions take parcels from lower atmosphere above 500 hPa...
Deep Boundary CurrentA current that connects high-latitude ocean waters (where deep water is formed) with upwelling regions. The...
Deep CirculationThe mass circulation of the oceans that carries cold polar surface water to depth, sinking due to higher...
Deep ConvectionLarge mass flows of water in the deep ocean that form critical parts (and return paths) of the great ocean...
Deep Coral Carbonate MoundTopographic seafloor structures that are the result of previous periods of coral growth, often with...
Deep Draft VesselBarges, ships, or ferries operating primarily in the open ocean. Shipping on the Great Lakes and the Saint...
Deep DrillingThose drilling events in the Delaware Basin that reach or exceed a depth of 2,150 feet below the surface...
Deep MiningThe exploitation of coal or mineral deposits at depths exceeding about 3,000 feet. Also known as underground...
Deep Precipitating Cumulus ConvectionVertical transport of heat, moisture and momentum. Cumulus convection where the cloud layer is associated...
Deep Vein ThrombosisA blood clot (thrombus) in a deep vein in the lower extremity.
Deep Water Coral ReefReefs formed by deepwater azooxanthellate (i.e., lacking symbiotic algae), stony corals (Order Scleractinia)...
Deep WebThe deep web makes up information on the internet that is accessible, but will not be found by regular search...
deep well injectionA process by which waste fluids are injected deep below the surface of the earth.
Deep/Cold Water Coral ReefReefs formed by deepwater azooxanthellate (i.e., lacking symbiotic algae), stony corals (Order Scleractinia)...
Deepwater HabitatAny open water area in which the mean water depth exceeds 6.6 feet in nontidal areas or at mean low water in...
Deepwater Horizon Oil Spill1. April 20, 2010 Deepwater Horizon mobile offshore drilling unit explosion and resulting oil spill.
Deepwell InjectionDisposal of wastewater, brine, or other waste through injection wells.
Deer RepellentSubstance which, when applied, through taste or odor, discourages deer from browsing on the protected...
Defeat Device1. AECD or other control feature that reduces the effectiveness of the emission control system under...
DefecationThe normal process of elimination of fecal material from the rectum.
DefendantAny person alleged in a complaint under §27.7 to be liable for a civil penalty or assessment under §27.3.
Defense ClauseA provision in a casualty insurance policy that provides additional coverage for defense costs.
Defense CostsLegal costs, charges, and expenses incurred in the investigation, defense, or the adjustment of a claim.
Defense WasteRadioactive waste from any activity performed in whole or in part in support of DOE atomic energy defense...
DefensibleThe ability to withstand any reasonable challenge related to the veracity of integrity of laboratory...
Defensible SpaceBuffer you create between a building on your property and the grass, trees, shrubs, or any wildland area that...
Defensive BehaviorSelf protective behavior
Defensive SecretionCaustic, irritant or foul smelling fluids produced by insects as a means of defense; applied to victims...
Deficiency DiseasesA condition produced by dietary or metabolic deficiency. The term includes all diseases caused by an...
Define the CaseA step in the Stressor Identification process in which the impairment and its spatial and temporal scope are...
Defined Area Use DenialTo deny or restrict the use of any area for the present or future discharge of any dredged or fill material.
Defined Excluded LiabilitiesA risk allocation tool used in property transactions that identifies and allocates between seller and buyer...
Defined Organic Parent FileThe Defined Organic Parent (DOP) file is a specialized SDF file created for use in Structure-Activity...
Deflocculating AgentA material added to a suspension to prevent settling.
DeflouridationThe removal of excess fluoride in drinking water to prevent the staining of teeth.
Defluoridation(de-FLOOR-uh-DAY-shun) The removal of excess fluoride in drinking water to prevent the mottling (brown...
DefoliantAn herbicide that removes leaves from trees and growing plants.
Deforestation1. Those practices or processes that result in the conversion of forested lands for non-forest uses...
DefrostingRemoval of frost contamination from an aircraft when there has been no active precipitation.
DefumerProcess unit that is used for holding pitch-impregnated refractory shapes as the shapes defume or cool...
Degasification1. (DEE-GAS-if-uh-KAY-shun) A water treatment process which removes dissolved gases from the water. The gases...
Degasification System1. Surface pre-mining, horizontal pre-mining, and post-mining systems.
Degasification WellWell which facilitates the escape of gases from coal mines for safety purposes.
Degassing BoxDevice exterior to a furnace, located in a transfer line from a furnace, used to refine (flux) molten...
DegenerationThe process of declining from a higher to a lower level of effective power or vitality or essential quality.
DeglutitionThe act of taking solids and liquids into the gastrointestinal tract through the mouth and throat.
Degradable Organic Carbon1. Fraction of DOC that actually decomposes under the (presumably anaerobic) conditions within the landfill.
DegradatesThe product of the environmental transformations of a pesticide. Degradates can have similar properties to...
Degradation1. Conversion of an organic compound to one containing a smaller number of carbon atoms.
degradation potentialThe degree to which a substance is likely to be reduced to a simpler form by bacterial activity.
Degraded Aquatic HabitatDegraded aquatic habitat (habitat alterations) occurs when naturally occurring stream channels are changed or...
Degraded Aquatic LifeDegraded aquatic life (impaired biota) means that the biological community normally expected in a lake...
Degraded WetlandWhen a wetland functions properly, it provides water quality protection, fish and wildlife habitat, natural...
DegreaserA chemical such as soap, solvents, alkali, or detergent that dissolves and helps remove greases and oils.
DegreasingRemoving surface grease and oils
Degree DayA rough measure estimating the amount of heat in a given area; it is defined as the difference between the...
Degree Day NormalsSimple arithmetic averages of monthly or annual degree days over a long period of time (usually the 30 year...
Degree Days (Population Weighted)Heating or cooling degree days weighted by the population of the area in which the degree days are recorded...
Degree of FreedomThe total number of items in a sample minus the number of independent relationships existing among them; the...
Degree of the Polynomial Model SettingThe number of times dose is factored into the model equation (maximum=21). A value must be entered here...
Degrees of Freedom1. For dose-response model fitting, the number of data points minus the number of model parameters estimated...
Dehydrated Onion and Garlic ProcessingProcessing of dehydrated onions and garlic into the following product styles: Air, vacuum, and freeze dried...
Dehydrated Vegetable ProcessingProcessing of dehydrated vegetables in the following product styles: Air, vacuum and freeze dried, blanched...
DehydrationThe removal of the water from any substance.
Dehydrator1. Device in which a liquid absorbent (including desiccant, ethylene glycol, diethylene glycol, or...
Dehydrator Vent Emission1. Natural gas and CO2 released from a natural gas dehydrator system absorbent (typically glycol) reboiler or...
DehydrogenationThe removal of hydrogen from a chemical compound.
DeicingProcedures and practices to remove or prevent any accumulation of snow or ice on:(1) An aircraft; or(2)...
DeionizeTo remove ions from a solution using an ion-exchange process.
Deionized WaterASTM Type I water or equivalent.
DelawareThe coastal drainage and associated waters from and including the Manasquan River Basin to and including the...
Delaware BasinThose surface and subsurface features which lie inside the boundary formed to the north, east and west of the...
DelayCause something to take longer than reasonably expected or planned, postpone, or slow the completion or...
Delayed Coker VentMiscellaneous process vent that contains uncondensed vapors from the delayed coking unit's blowdown system...
Delayed Coking Unit1. One or more refinery process units in which high molecular weight petroleum derivatives are thermally...
Delayed Compliance OrderAn order issued by the State or by the Administrator to an existing stationary source, postponing the date...
Delayed Health EffectA disease or an injury that happens as a result of exposures that might have occurred in the past.
Delayed Health HazardToxic effect occurring after a lapse of time
Delayed-Type Hypersensitivity1. Delayed hypersensitivity reaction (DTH) - type IV reaction, an inflammatory response that develops 24 to...
Delegate AgencyState air pollution control agency, local agency, other State agency, Tribal agency, or other agency...
Delegated AgencyAny agency that has been delegated authority to implement and enforce requirements of this part by the...
Delegated StateA state (or other governmental entity such as a tribal government) that has received authority to administer...
Delegation & PartnershipsActivities to manage external relationships related to the conduct of Agency business, including formal legal...
Deleted from the NPLDeletion of sites from the National Priorities List (NPL) may occur once all response actions are complete...
deleted NPL siteA site that has been deleted from the Superfund National Priorities List because its cleanup goals have been...
DELETINGThe process of permanently removing, erasing, or obliterating recorded information from a medium, especially...
Deletion from National Priorities ListDeletion of sites from the National Priorities List (NPL) may occur once all response actions are complete...
Deletion from the NPLDeletion of sites from the National Priorities List (NPL) may occur once all response actions are complete...
Deliberately Modified Genetic MaterialDirected addition, rearrangement, or removal of nucleotide sequences to or from genetic material.
Deliberative Process PrivilegeDocuments and records created during the government's internal decision making process; it is well...
DelimiterDelimiters are characters used to separate items in the same field in a database. In the HERO database, a...
DelineationThe process of identifying a watershed boundary on the basis of topographic information.
Delineation WellWell drilled in order to determine the boundary of a field or producing reservoir. [40 CFR 60.5430b (CFR...
Delinquent DebtDebt which has not been paid by the date specified by the Government for payment or which has not been...
DeliriumA usually reversible condition characterized by the acute and sudden development of confusion, illusions...
Delist1. Use of the petition process (1) to have a chemical's toxic designation rescinded; (2) to remove a site...
DelistedIndicates whether a waterbody or segment has been removed from a list of impaired waters or areas of concern...
Delisted ReasonThe specific reason or explanation for removing a waterbody or segment from a list of impaired waters or...
DelistingA site-specific petition process whereby a handler can demonstrate to EPA that a particular wastestream...
Delivered LoadThe amount of a pollutant delivered to the tidal waters of the Chesapeake Bay or its tidal tributaries from...
Delivered ProductGreen power fed into the same electric transmission and distribution system that serves the end user. Review...
Delivery PotentialThe likelihood that a hazardous input will be transported to a community resource.
Delivery RatioFactor applied to pollutant reduction credits when sources are directly discharging to a waterbody of concern...
Delivery StationFacility where the pipeline product is delivered to the customer.
Delmarva BayPonded, depressional wetlands that occur along the Atlantic coastal plain. [40 CFR 401.11 (CFR 2017)][40 CFR...
Delmarva Peninsula1. The land separating the Chesapeake Bay from the Atlantic Ocean. The Delmarva Peninsula falls within the...
delta1. A low relief landform composed of sediments deposited at the mouth of a river that commonly forms a...
Delta Diversityas change along climatic gradients or among geographic areas.
Delta MethodVariance of a function of random variables approximated from the derivatives of the function with respect to...
Delta Plain1. The level (or nearly level) surface that makes up the landward part of a large delta; strictly, a flood...
Demagging BoxDevice exterior to a furnace, located in a transfer line from a furnace, used to refine (flux) molten...
Demand1. Generally, the amount of a particular good or service that a consumer or group of consumers will want to...
Demand chargeThe peak kW demand during any quarter hour interval multiplied by the demand charge rate.
Demand CurveThe relationships between various prices of a good and the changing quantities of it that people want under...
Demand Forecast1. A projection of future demand that can be made on a systemwide or customer-class basis.
Demand ManagementMeasures, practices, or incentives deployed by water utilities to permanently reduce the level or change the...
Demand Response ProgramIncentive-based programs that encourage electric power customers to temporarily reduce their demand for power...
Demand response programsIncentive-based programs that encourage electric power customers to temporarily reduce their demand for power...
demand-dosingA configuration in which a specific volume of effluent is delivered to a component (e.g., a drainfield)...
Demand-Side MeasureA measure:(1) To improve the efficiency of consumption of electricity from a utility by customers of the...
Demand-side Waste ManagementPrices whereby consumers use purchasing decisions to communicate to product manufacturers that they prefer...
DemanufacturingDisassembly and recycling of obsolete consumer products such as computers, electronic appliances, and carpet...
Dementia1. Loss of intellectual abilities interfering with an individual's social and occupational functions. Causes...
DemercurizationRemoval of mercury.. Roasting/retorting and incineration are thermal techniques and the most commonly used...
De-MethanizerNatural gas processing unit that separates methane rich residue gas from the heavier hydrocarbons (e.g...
De-MethanizingNatural gas process that separates methane rich residue gas from the heavier hydrocarbons (e.g., ethane...
Demineralization1. (DEE-MIN-er-al-uh-ZAY-shun) A treatment process which removes dissolved minerals (salts) from water.
DemographicHaving to do with population or socioeconomic conditions.
Demographic Index1. The Demographic Index in EJSCREEN is a combination of percent low-income and percent minority, the two...
Demographic InformationPersonal characteristics of a person or group (e.g., age, sex, race/ethnicity, residence, and occupation)...
Demographic QuestionA question used in compiling vital background and social statistics.
Demonstration field programA collection of demonstration research projects to provide preliminary estimates of resource condition for...
Demonstration projectA field research project designed to provide preliminary estimates of a resource condition for a single...
DemulcentCompounds that form soothing films on the surface of mucous membranes. They are generally used as agents to...
Denatured Fuel EthanolAnhydrous ethanol that contains a denaturant to make it unfit for human consumption, that is produced or...
DendrimerTree-like, highly branched, polymeric compounds. They grow three-dimensionally by the addition of shells of...
Dendritic Cell1. A type of antigen-presenting cell that picks up foreign substances from the bloodstream and presents them...
Dendritic DrainageThe dendritic drainage pattern is characterized by irregular branching in all directions with the tributaries...
Dendritic Web TechniqueA method for making sheets of polycrystalline silicon in which silicon dendrites are slowly withdrawn from a...
DendroctonusBark Beetle
Denial of ServiceAn attack that prevents or impairs the authorized use of information system resources or services.
Denitrification1. The biochemical reduction of nitrate or nitrite to gaseous nitrogen, either as molecular nitrogen or as an...
denitrification enzyme assayAn assay used to quantify the initial rate, or Phase I, of denitrification using the acetylene block...
Denitrifying MicroorganismBacteria which reduce nitrates and nitrites to elemental nitrogen
Dense DevelopmentNumber of units (housing units) per unit area of land is above 80 to 100 per hectacre.
Dense Gas SystemConveyance system operated to limit oxygen levels below 12 percent.
Dense Non-Aqueous Phase Liquid1. A non-aqueous phase liquid (NAPL) with a specific gravity greater than 1.0. Because the specific gravity...
Dense Nonaqueous Phase LiquidA DNAPL is one of a group of organic substances that are relatively insoluble in water and more dense than...
Dense Non-Aqueous Phase LiquidsSuch as chlorinated solvents, creosote based wood-treating oils, coal tar wastes, and pesticides are...
Densified logsLogs that are made of compressed sawdust.
Density1. (DEN-sit-tee) A measure of how heavy a substance (solid, liquid or gas) is for its size. Density is...
Density FlowFlow caused by differential density between two convergent water masses - or by a parcel of denser water...
Density logAlso called gamma-gamma log; gamma photons from a radioactive source in the sonde are backscattered to a...
Density-DependenceRegulation of the size of a population by mechanisms that are themselves controlled by the size of that...
Density-Dependence ProcessRegulation of the size of a population by mechanisms that are themselves controlled by the size of that...
Dental AmalgamAlloy of elemental mercury and other metal(s) that is used in the practice of dentistry.
Dental Amalgam DischargeDischarge from dentists' offices containing dental amalgam. Dental amalgam, sometimes referred to as “silver...
Dental DischargerFacility where the practice of dentistry is performed, including, but not limited to, institutions, permanent...
Dental OfficePlace where dentistry (care and treatment of the teeth) is practiced.
DentifriceAny preparation used for cleansing teeth; they usually contain an abrasive, detergent, binder and flavoring...
DenuderHorizontal or vertical container which is part of a mercury chlor-alkali cell and in which water and alkali...
Deny or Restrict UseTo deny or restrict the use of any area for the present or future discharge of any dredged or fill material.
DeodorantAgents that remove, correct, repress, or mask undesirable ODORS. In personal hygiene, deodorants often...
Deoxycytidine MonophosphateDeoxycytidine (dihydrogen phosphate). A deoxycytosine nucleotide containing one phosphate group esterified to...
DeoxynivalenolA mycotoxin produced by Fusarium fungi that infect corn, wheat, oats, barley, rice, and other grains
Deoxyribonucleic Acid1. DNA is the chemical name for the molecule that carries genetic instructions in all living things. The DNA...
DepaintingRemoval of a permanent coating from the outer surface of an aerospace vehicle or component, whether by...
Depainting EquipmentTools or machines used to remove any dried coating from a hard surface, such as media blasting equipment...
Depainting OperationUse of a chemical agent, media blasting, or any other technique to remove permanent coatings from the outer...
Department HeadHead of any Federal department or agency, for example, the Secretary of HHS, and any other officer or...
Department of DefenseSee http://www.defenselink.mil/admin/about.html. The mission of the Department of Defense (DOD) is to provide...
Department of EnergySee http://www.energy.gov/. In 1989, the Department of Energy (DOE) created the Office of Environmental...
Department of TransportationSee http://www.dot.gov/. Established by an act of Congress on October 15, 1966, the Department of...
Departure Angle1. Smallest angle, in a plan side view of an automobile, formed by the level surface on which the automobile...
Departure curvesGraphs that show the correction that may be made to logs for some extraneous effects, such as hole diameter...
Dependent Variable1. A variable that may, it is believed, be predicted by or caused by one or more other variables called...
de-perched dunesDunes that form on lowland areas beyond plateaus.
DephosphorylationThe catalyzed removal of phosphate groups from biological molecules, by phosphatases.
Depleted Uranium1. The material left over after natural uranium has been processed to make fuel for use in nuclear power.
Depletion CurveIn hydraulics, a graphical representation of water depletion from storage-stream channels, surface soil, and...
DepolymerizationType of chemical change in which a polymeric substance breaks down into simpler, smaller weight substances as...
Deposited Coating SolidCoating solids which remain on the substrate or object being painted.
Deposition1. The lying, placing, or throwing down of any material.
depositional beachesBeaches that receive more sand than they lose over time.
DEPOSITORYA place where records are kept and made available for use. Also called repository. See also ARCHIVES (3).
Depository SiteSite (other than a processing site) selected under Section 104(b) or 105(b) of the Act.
Deposit-Refund SystemA combination of a product charge (the deposit) and a subsidy for recycling or proper disposal (the refund)...
Depreciation1. Reduction in value of an item caused by the elapse of time between the date of acquisition and the date of...
Depression1. A low area in a field where surface drainage away from the area does not occur.
Depressurization1. A condition that occurs when the air pressure inside a structure is lower that the air pressure outdoors...
depth of closureA theoretical depth below which sediment exchange between the nearshore (beach and shoreface) and the...
Depth of invasionRadial distance from the wall of the hole to which mud filtrate has invaded.
Depth reference or datumZero reference for logs of a well; kelly bushing may be used if the rig is still on the well; ground level or...
Depth sectionA cross section to which a velocity function has been applied, thus converting arrival times of reflections...
Depuration1. A process that results in elimination of toxic substances from an organism.
Depuration RateThe rate at which a substance is eliminated from an organism.
DerailmentA non-collision event in which one or more wheels of a rail transit vehicle unintentionally leaves the rails.
Derated Generation CapacityDecrease in the available capacity of an electric generating unit, due to a system or equipment modification...
DerechoA derecho (pronounced similar to “deh-REY-cho” in English) is a widespread, long-lived wind storm that is...
Derivative Engine1. For Emissions Certification Purposes, engine that has the same or similar emissions characteristics as an...
Derived 5-Cycle Carbon Dioxide5-cycle CO2 derived from the FTP-based city and HFET-based highway fuel economy by means of the equation...
Derived 5-Cycle Fuel Economy5-cycle fuel economy derived from the FTP-based city and HFET-based highway fuel economy by means of the...
Derived Data1. Any previously published dataset that the researcher has added data to or subtracted data from to form the...
Derived ProductA new datastream generated by applying an algorithm or model to existing data.
Derived-From RuleA rule that regulates residues from the treatment of listed hazardous wastes.
DermalPertaining to the skin
Dermal Absorption1. Process by which a chemical penetrates the skin and enters the body as an internal dose.
Dermal adherenceThe loading of a substance onto the outer surface of the skin.
Dermal Contact1. Contact with (touching) the skin.
Dermal ExposureContact between a chemical and the skin.
Dermal ToxicityThe ability of a pesticide or toxic chemical to poison people or animals by contact with the skin.
Dermatitis1. Inflammation of the skin
DermatophyteSeveral well-known anamorphic forms are parasitic upon the skin.
DermatoxinSpecific substances elaborated by plants, microorganisms or animals that cause damage to the skin; they may...
Dermo1. An oyster disease caused by the protozoan parasite Perkinsus marinus, which many Chesapeake Bay oysters...
DESA synthetic estrogen, diethylstilbestrol is used as a growth stimulant in food animals. Residues in meat are...
Des MoinesThe Des Moines River Basin. Iowa, Minnesota, Missouri. Area = 14400 sq.mi.
Desalination1. Removing salts from ocean or brackish water by using various technologies.
Desalinization(DEE-SAY-leen-uh-ZAY-shun) The removal of dissolved salts (such as sodium chloride, NACI) from water by...
DESCRIPTION1. In records management, the process of giving a written account of the contents and characteristics of a...
descriptive epidemiologic study1. An evaluation of the amount and distribution of a disease in a specified population by person, place, and...
Descriptive EpidemiologyAspect of epidemiology concerned with organizing and summarizing health-related data according to time...
Descriptive LiteratureInformation provided by an offeror, such as cuts, illustrations, drawings, and brochures, that shows a...
Descriptive StatisticA statistic used to describe a set of samples upon which observations were made.
DesertA land area so dry that little or no plant or animal life can survive.
Desert DustAerosols comprising of minerals from arid and semi-arid regions that absorb sunlight as well as scatter...
Desert PlantPlants such as cacti and other succulentsnaturally suited to thrive in an environment of extreme temperatures...
Desertification1. Land degradation in arid, semi-arid, and dry sub-humid areas resulting from various factors, including...
Desiccant1. (DESS-uh-kant) A drying agent which is capable of removing or absorbing moisture from the atmosphere in a...
Desiccant Cooling DeviceUses solar thermal energy to regenerate (dry) the desiccant.
Desiccation(DESS-uh-KAY-shun) A process used to thoroughly dry air; to remove virtually all moisture from air.
Desiccator(DESS-uh-KAY-tor) A closed container into which heated weighing or drying dishes are placed to cool in a dry...
Design1. The overall plan for a particular evaluation. The design describes how program performance will be...
Design & Manage Employee Training ProgramsRefers to planning, administering, or evaluating programs designed to develop employees and manage learning...
Design and Construction TechnologyAny physical configuration of the cooling water intake structure, or a technology that is placed in the water...
Design CapacityThe average daily flow that a treatment plant or other facility is designed to accommodate.
Design ConceptType of facility identified by the project, e.g., freeway, expressway, arterial highway, grade-separated...
Design Controlled Potential Particulate Matter Emissions RateTheoretical particulate matter (PM) emissions (Mg) that would result from the operation of a control device...
Design EfficiencyRated overall net efficiency ( e.g., electric plus useful thermal output) on a lower heating value basis at...
Design ElementAny control system (i.e., computer software, electronic control system, emission control system, computer...
Design EvaluationProcedure for evaluating control devices that complies with the requirements in § 63.985(b)(1)(i).
design flowProjected flow through a watercourse that will recur with a stated frequency. The projected flow for a given...
Design for DeconstructionDesigning buildings to facilitate future renovations and eventual dismantlement, including designing for...
Design ScopeDesign aspects which will affect the proposed facility's impact on regional emissions, usually as they relate...
Design Stream FlowThe stream flow used to conduct steady-state wasteload allocation modeling.
Design ValueThe monitored reading used by EPA to determine an area's air quality status; e.g., for ozone, the fourth...
Designated AgencyState, local, or Federal agency designated by the state under the provisions of § 68.215(d) .
Designated Agency OfficialDirector, Office of Civil Rights.
Designated Certification OfficerEPA official to whom the Administrator has delegated authority to issue EIAPP certificates. Note that the...
Designated Compliance Officer1. Manager, Engine Programs Group (6403-J), U.S. Environmental Protection Agency, 1200 Pennsylvania Ave...
Designated Enforcement OfficerDirector, Air Enforcement Division (2242A), U.S. Environmental Protection Agency, 1200 Pennsylvania Ave...
Designated Existing FacilityAny existing facility (see § 60.2(aa)) which emits a designated pollutant and which would be subject to a...
Designated Facility1. A hazardous waste treatment, storage, or disposal facility which has received a RCRA permit (or interim...
Designated for Drinking Water UseSection 305(a) of the Clean Water Act requires states to prepare a water quality inventory that designates...
Designated Management AgencyAgency identified by a WQM plan and designated by the Governor to implement specific control recommendations.
Designated OfficerManager of the Engine Programs Group (6405-J), U.S. Environmental Protection Agency, 1200 Pennsylvania Ave...
Designated PersonAny person designated by the local education agency (LEA), who is properly trained to direct and oversee...
Designated Pollutant1. An air pollutant which is neither a criteria nor hazardous pollutant, as described in the Clean Air Act...
Designated ProductsProducts that are or can be made from recovered materials that have been designated in the CPG through EPA's...
Designated RecordShall include laboratory analysis reports that identify whether gasoline meets the requirements for a given...
Designated Representative1. Meaning given to it in section 402(26) of the Act and the regulations promulgated thereunder.
Designated State AgencyState agency designated by State law or other authority to be responsible for registering pesticides to meet...
Designated use1. Classification specified in water quality standards for each waterbody or segment describing the level of...

1,538 of 30,736 terms in Environment terminology (MLC-0121). Request the full dataset.