Environment terminology · MLC-0121

Environment terms: R (1,610)

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Research ethicsEthical conduct in research.
Research gas mixtureCalibration gas mixture developed by agreement of a requestor and NIST that NIST analyzes and certifies as...
Research life cycleThe stages of research as defined by EPA's Office of Research and Development including planning, project...
Research milestoneA scheduled event signifying the completion of a major or critical Research Activity/Task/Study, Research...
Research misconduct1. Intentional, knowing, or reckless behavior in research that is widely viewed as highly unethical and often...
Research negligencea failure to follow the standard of care which results in harm to a person or organization. In science...
Research or laboratory activity1. Operation whose primary purpose is for research and development of new processes and products that is...
Research or laboratory equipment1. Any equipment for which the primary purpose is to conduct research and development into new processes and...
Research or laboratory facility1. Any stationary source whose primary purpose is to conduct research and development to develop new...
Research or laboratory operationOperation whose primary purpose is for research and development of new processes and products, that is...
Research outcomeThe expected result, Impact, or consequence that ORD will realize due to ORD research.
Research outputOutputs are Research Products (synthesized and/or translated) in the format needed by the End User. Outputs...
Research permission childAgreement of parent(s) or guardian to the participation of their child or ward in research.
Research permit1. EPA may issue research permits for the dumping of materials into the ocean as part of a research project...
Research problem statementA concise description of the issues that need to be addressed by the National Research Program. It is used to...
Research productProducts that are a direct outcome of research and that are formulated to meet the needs of the end user.
Research product (deliverable)A deliverable that results from a specific Research Project or Research Task. This may include (not an...
Research projectA single, focussed activity with a single primary research objective. The project includes the entire...
Research reportA book-length presentation of the best of EPA's research findings.
Research reproducibilityThe ability to generate the same results of an investigation when it is repeated by another person, or by...
Research rigorStrict application of the scientific method to ensure robust and unbiased experimental design, methodology...
Research securitySafeguarding the research enterprise against the misappropriation of research and development to the...
Research typeSeveral classifications which describe research including the research purpose and the venue.
Research venueResearch characterized by context or setting.
Reseller1. Any person who purchases gasoline or diesel fuel identified by the corporate, trade, or brand name of a...
ReservationAll land within the limits of any Indian reservation under the jurisdiction of the United States Government...
ReserveThe quantity of mineral demonstrated to be present and known to be economically producible.
Reserve capacity1. Pollutant loading rate set aside in determining stream waste load allocation accounting for uncertainty...
Reserve volume1. The volume of air remaining in the lungs after a maximal expiration.
Reserved"Reserved" is a term used as a placeholder within the Code of Federal Regulations. An agency uses "Reserved"...
Reserved emission credit1. Emission credits generated within a model year waiting to be reported to EPA at the end of the model year.
Reserved landFederal lands which are dedicated to or set aside for a specific purpose or program and which are, therefore...
Reserved lands, see Reserved land
Reservoir1. A pond, lake, tank or basin, natural or man-made, used for the storage, regulation and control of water.
Residence1. Any home, house, apartment building, or other place of dwelling which is occupied during any portion of...
Residence time1. Length of time that a pollutant remains within a section of a stream or river. The residence time is...
ResidentA species that lives permanently in a particular area.
Resident animal speciesSpecies that lives permanently in a particular area.
Resident individualA person who lives or attends school or day care on a property with an area of observed contamination and...
Resident individual subject to level I concentrationsA resident individual is subject to Level I concentrations if, the concentration of a hazardous substance...
Resident individual subject to level II concentrationsA resident individual not subject to Level I concentrations.
Resident population1. Resident population of the United States includes persons resident in the 50 States and the District of...
Resident speciesA species that lives permanently in a particular area.
Residential boilerBoiler used to provide heat and/or hot water and/or as part of a residential combined heat and power system...
Residential building1. A structure used primarily as a dwelling for one or more households.
Residential end-use sectorConsists of all private residences, whether occupied or vacant, owned or rented, including single family...
Residential furnaceFurnaces burn natural gas, fuel oil, propane/ butane (bottled gas), or electricity to warm the air. The...
Residential hydronic heaterHeating system where a hot piped liquid, usually water, transfers heat from the boiler to the rest of the...
Residential landWhere the structures house dwelling units. Residential land uses range from high density, represented by the...
Residential lead-based paint wasteWaste containing lead-based paint, which is generated as a result of activities such as abatement...
Residential masonry heaterSolid-fueled heating device in which the heat from combustion in the firebox is stored in masonry and slowly...
Residential occupancy periodThe time between a person moving into a residence and the time the person moves out or dies.
Residential propertyAny property that is used for any of the purposes described in the following standard land use codes (ref...
Residential smart meterA meter that records a customer's electricity usage for time intervals of one hour or less, and can transmit...
Residential solid wasteWastes generated by the normal activities of households, including, but not limited to, food wastes, rubbish...
Residential tankTank located on property used primarily for dwelling purposes.
Residential type central air conditionerThere are four basic parts to a residential central air-conditioning system (1) a condensing unit, (2) a...
Residential use1. Pesticide application in and around houses, office buildings, apartment buildings, motels, and other...
Residential volumeThe volume (m3) of the structure in which an individual resides and may be exposed to airborne contaminants.
Residential waste1. Refers to waste generated by single- and multi-family homes including old newspapers, clothing, disposable...
Residential wellA pumping well that serves one home or is maintained by a private owner.
Residential wood heaterSeveral types of wood-burning appliances that people use to heat their home - either as a primary source of...
Residential/Commercial AreaThose areas where people live or reside, or where people work in other than manufacturing or farming...
Residual1. Amount of a pollutant remaining in the environment after a natural or technological process has taken...
Residual chlorineThe amount of free and/or available chlorine remaining after a given contact time under specified conditions.
Residual contaminationContaminants left at a site after the risks posed by the site have been reduced and the site no longer...
Residual currentCurrent movement resulting from asymmetry in tidal flow - notably within a partially enclosed estuary or...
Residual disinfectant concentration1. "C" in CT calculations.
Residual disinfectant concentration (regulatory), see Residual disinfectant concentration
Residual emissionDifference in emissions from an OCS source if it applies the control requirements(s) imposed pursuant to §...
Residual fuel1. A petroleum fuel with a T90 temperature at or above 700 °F. For example, No. 5 fuels and No. 6 fuels are...
Residual fuel oil1. The heavier oils that remain after the distillate fuel oils and lighter hydrocarbons are distilled away in...
Residual fuel oil no. 5 (Navy Special)Classification for the heavier fuel oil generally used in steam powered vessels in government service and...
Residual fuel oil no. 6 (a.k.a. Bunker C)Classification for the heavier fuel oil generally used for the production of electric power, space heating...
Residual layerThe elevated portion of a convective boundary layer that remains after a stable boundary layer develops at...
Residual oil1. Crude oil, fuel oil numbers 1 and 2 that have a nitrogen content greater than 0.05 weight percent, and all...
Residual oil fly ashThe inorganic residue remaining after the incomplete oxidation of oil and residual fuel oil.
Residual radioactive materialWaste (which the Secretary determines to be radioactive) in the form of tailings resulting from the...
Residual radioactive material controlAny remedial action intended to stabilize, inhibit future misuse of, or reduce emissions or effluents from...
Residual risk1. The risk associated with pollutants after the application of maximum achievable control technology or MACT.
Residual saturation1. Saturation below which fluid drainage will not occur.
Residual treeLive trees left standing after the completion of harvesting.
Residual trees, see Residual tree
Residual variance1. The variance in experimental measurements remaining after accounting for the variance due to the...
Residual volume1. The lung volume after maximal expiration (TLC - VC).
Residuals, see Residual
Residuals (Waste)1. Any liquid or solid material containing Table 9 compounds that is removed from a wastewater stream by a...
Residue1. The dry solids remaining after the evaporation of a sample of water or sludge.
Residue gasProduction lease natural gas from which gas liquid products and, in some cases, non-hydrocarbon components...
Residue gas compressorCompressors operated by the processing facility, whether inside the processing facility boundary fence or...
Residue of concernParent pesticidal compound and its metabolites, degradates, and impurities of toxicological concern.
Residue studiesResearch which examines the recalcitrance, bioavailability, toxicity, solubility, etc. of pesticide residues...
Residue toleranceMaximum permissible residue level for pesticides in raw agricultural produce and processed foods. Any food...
Residues, see Residue
ResiduumResidue from crude oil after distilling off all but the heaviest components, with a boiling range greater...
Resilience1. A capability to anticipate, prepare for, respond to, and recover from significant multi-hazard threats...
Resiliency planAddresses a community's capability to anticipate, prepare for, respond to, and recover from significant...
ResinSynthetic adhesive (including glue) or natural binder, including additives, used to bond wood or other...
Resin canalTubular intercellular spaces lined with resin-secreting cells, common in the wood, bark, and leaves of many...
Resin gradeSubdivision of resin classification which describes it as a unique resin, i.e., the most exact description of...
Resin manufacturing type1. Broad classification of resin referring to the basic manufacturing process for producing that resin...
Resin modified emulsion pavementResin modified emulsion pavement contains a binder made primarily from tree resins. Construction processes...
Resin stripperUnit that removes organic compounds from a raw polyvinyl chloride and copolymer product. In the production of...
Resin systemType of resin used, including but not limited to urea-formaldehyde, soy, phenol-formaldehyde, or...
Resinated woodWood products (containing binders and adhesives) produced by primary and secondary wood products...
Resin-bonded refractory productFormed refractory product that is manufactured using a phenolic resin or other type of thermosetting resin as...
Resinous materialViscous, high-boiling point material resembling pitch or tar, such as plastic resin, that sticks to or...
ResistanceFor plants and animals, the ability to withstand poor environmental conditions or attacks by chemicals or...
Resistance processA Resistance Process consists of activities of biologic molecules or complexes involved in processes that...
Resistant statisticA statistic that is not much influenced by changes in a few observations.
Resistivity (electrical)Electrical resistance to the passage of a current, expressed in ohm-meters; the reciprocal of conductivity.
Resistivity logAny of a large group of logs that are designed to make quantitative measurements of the specific resistance...
Resistivity logs, see Resistivity log
Resolution1. The ability of a microform or optical disk system to record and display fine detail.
Resolution targetA chart containing a number of increasingly smaller resolution test patterns consisting of sets of horizontal...
Resource1. Anything used by organisms to meet their needs, including air, water, minerals, plants, fuels, and other...
Resource classA subdivision of a resource; examples include small lakes, oak-hickory forests, emergent estuarine wetlands...
Resource conservationConserving natural resources and energy use by managing materials more efficiently. Three primary strategies...
Resource Conservation & Recovery ActTo provide technical and financial assistance for the development of management plans and facilities for the...
Resource Conservation and Recovery Act corrective measure constructionThe Resource Conservation and Recovery Act (RCRA) Corrective Measure Construction (CMC) is the implementation...
Resource Conservation and Recovery Act corrective measure designThe Resource Conservation and Recovery Act (RCRA) Corrective Measure Design (CMD) establishes the general...
Resource Conservation and Recovery Act corrective measure studyThe Resource Conservation and Recovery Act (RCRA) Corrective Measure Study (CMS) develops and evaluates...
Resource Conservation and Recovery Act facility assessmentA facility assessment completed under the Resource Conservation and Recovery Act that identifies solid waste...
Resource Conservation and Recovery Act facility investigationThe Resource Conservation and Recovery Act (RCRA) Facility Investigation (RFI) evaluates the nature and...
Resource Conservation and Recovery Act Information SystemA national program management and inventory system about hazardous waste handlers.
Resource Conservation and Recovery Act Interim/Stabilization MeasureThe Resource Conservation and Recovery Act (RCRA) Interim/Stabilization Measure (ISM) is a RCRA removal...
Resource Conservation and Recovery Act OrderAny formal Resource Conservation and Recovery Act order submitted when violations are detected during...
Resource Conservation and Recovery Act SB/RTCRCRA corrective action decision document reflecting the remedy to be implemented at a...
Resource Conservation ChallengeA major national effort to find flexible, yet more protective, ways to conserve our valuable natural...
Resource depletionUsing up or making unusable resources that occur in nature without providing for replenishment
Resource domainThe areal extent of a resource; the region occupied by a resource.
Resource fieldA production unit consisting of a collection of oil and gas pools that when projected to the surface form an...
Resource groupIn EMAP's Resource Monitoring and Research section, a group of scientific and administrative personnel...
Resource lack of accessIn a public health emergency, individuals without access to testing, personal protective equipment...
Resource management systemA term used by NRCS defined as a combination of NRCS conservation practices and management identified by land...
Resource mismatchThe decoupling of a previously synchronized ecological relationship, such as changes in timing within a...
Resource officialsEPA's Senior Resources Officials (SROs) and Junior Resource Officials (JROs) are charged with strengthening...
Resource poolingThe provider’s computing resources are pooled to serve multiple consumers using a multi-tenant model, with...
Resource recovery1. The extraction of useful materials or energy from solid waste. Such materials can include paper, glass...
Resource Recovery ActTo amend the Solid Waste Disposal Act in order to provide financial assistance for the construction of solid...
Resource recovery unitFacility that combusts more than 75 percent non-fossil fuel on a quarterly (calendar) heat input basis.
Resource sensitivityThe responsiveness or susceptibility of an environmental asset to hazardous inputs.
Resource unitA unit of a discrete resource, for example, a lake. A population of such a resource will be an explicit set...
Resources, see Resource
Respect for persons1. To respect autonomy is to give weight to the autonomous person's considered opinions and choices while...
Respirable particlesRespirable particles are those that penetrate into and are deposited in the nonciliated portion of the lung...
Respiration1. The process in which an organism uses oxygen for its life processes and gives off carbon dioxide.
Respiration rateThe sum total of the physical and chemical processes in an organism by which oxygen is conveyed to tissues...
Respiratory disorders1. A non-neoplastic or neoplastic disorder that affects the tracheobronchial tree and/or the lung parenchyma...
Respiratory effectsEffects on the process of breathing or on the lungs.
Respiratory hypersensitivityForm of hypersensitivity affecting the respiratory tract. It includes asthma and seasonal allergic rhinitis.
Respiratory illnessDiseases effecting the organs we use to breathe. Asthma, bronchitis, and pneumonia are examples of...
Respiratory mortalityDeath or the death rate due to respiratory illness.
Respiratory mucosaThe mucous membrane lining the respiratory tract , including the nasal cavity; the larynx; the trachea and...
Respiratory system1. The organs in our body involved with the process of breathing.
Respiratory system measurementMeasurements which indicate the functioning of the organs that are involved in breathing. These include the...
Respiratory toxicantToxicants which affect the organs that are involved in breathing. These include the nose, throat, larynx...
Respiratory toxicityProperty of chemical which damages the respiratory function
Respond to global climate changeIncludes the design, implementation, and management of domestic and international programs, regulatory and...
Respondent1. Refers to the state, locality, or individual that completes a recycling measurement survey form.
Respondent error1. A type of non-sampling error caused by respondents intentionally or unintentionally providing incorrect...
Response1. The biological result of an exposure. This term is synonymous with effect, but emphasizes the receptor...
Response action1. A response action is a short-term removal action or a long-term remedial response, authorized under CERCLA...
Response action startPoint in time when funding is set-aside by either EPA, other Federal agencies, States, or PRPs to begin...
Response additivityIn a mixture, when the toxic response (rate, incidence, risk, or probability of effects) from the combination...
Response (Biological), see Response
Response claimA preauthorized demand in writing for a sum certain for response costs referred to in section 111(a)(2) of...
Response costAll costs of removal or remedial action incurred and to be incurred by the United States at a facility...
Response dataBiological result of an exposure or dose. Biological responses can be quantified in several ways. Some...
Response designThe process of obtaining a response at a site.Can be in a single index period during a year, or multiple...
Response equipment operating environmentRivers and Canals, Inland, Great Lakes, or Ocean. These terms are used to define the conditions in which...
Response rateThe percentage of persons in a sample who respond to a survey.
Response styleThe tendency of a respondent to answer in a specific way regardless of how a question is asked.
Response surfaceA theoretical multi-dimensional “surface” that describes the response of a model to changes in its parameter...
Response variable1. A variable on which information is collected and which there is an interest because of its direct policy...
Response variables (in the context of nutrient criteria)Quantifiable parameters (e.g., chlorophyll a, turbidity) that are used to indicate and measure change in...
Responsible agency1. The organizational element that has the legal duty to ensure that owners, operators, or users of...
Responsible corporate officerA person who is authorized by the regulated party to make representations on behalf of, or obligate the...
Responsible government official1. EPA Administrator or any EPA employee who is accountable to the Administrator for carrying out a power or...
Responsible maintenance officialPerson designated by the owner or operator as having the knowledge and the authority to sign records and...
Responsible management entityA legal entity responsible for providing various management services with the requisite managerial...
Responsible managerThe manager of the affected area.
Responsible official1. One of the following:(1) For a corporation, a president, secretary, treasurer, or vice-president of the...
Responsible party1. A person or business that is responsible for a hazardous site; whenever possible, EPA requires Responsible...
Responsive researchResearch that works closely with EPA’s Programs, Regions, and beyond and that is essential to identifying...
Responsiveness summary1. A summary of oral and written comments received by EPA during a public comment period on key documents or...
REST Web ServiceSoftware system designed to support machine-to-machine interaction over a network. Representational State...
Resting lossEvaporative emissions that may occur continuously, that are not diurnal emissions, hot soak emissions...
Resting sporeA spore that is thick-walled to enable it to remain dormant and survive through times of environmental stress
Restoration1. Return of an ecosystem to a close approximation of its presumed condition prior to disturbance.
Restoration Advisory BoardRestoration Advisory Boards (RABs) foster teamwork by bringing community members together with DOD, DOE, and...
Restoration plan1. A restoration plan is an EPA approved plan to restore water quality provided by the State. Plans could...
Restored ecosystemA degraded ecosystem that has been returned to a close approximation of its remaining natural potential
Restored waters1. Restored Waters is the process for bringing an impaired water back to its water quality standards to meet...
Restored wetlandA wetland that will mimic the functions of a healthy natural wetland.
Restricted diffusionTransport of substances across a biological membrane where the flux rate of the diffusing material is...
Restricted entry intervalThe time after a pesticide application during which entry into the treated area is restricted.
Restricted informationInformation that is privileged or that is otherwise protected from disclosure pursuant to applicable...
Restricted useA pesticide may be classified (under FIFRA regulations) for restricted use if it requires special handling...
Restricted use pesticide1. Restricted use pesticides - which make up about a quarter of total pesticides used - may be applied only...
Restricted use pesticide retail dealer1. Any person who makes available for use any restricted use pesticide, or who offers to make available for...
Restricted wastesWastes that have LDR treatment standards, but can be land disposed without treatment because of an exemption...
Restricted-use pesticides, see Restricted use pesticide
Restriction endonucleasesA class of endonucleases that cleaves DNA after recognizing a specific sequence.
Restriction enzymes1. Enzymes that recognize specific regions of a long DNA molecule and cut it at those points.
Restroom Divider/PartitionBarrier used to provide privacy in public restroom facilities.
ResultData value for a sample result or a code representing an observation (e.g., WMO codes). Result values can be...
Result remarkA single character code and definition used to further quantify a result.
Retail buildingBuildings used by commercial business, including grocery, clothing, and furniture shops, among others, which...
Retail competitionIn states with retail competition, consumers have the opportunity to choose their energy provider and...
Retail facilityStationary source at which more than one-half of the income is obtained from direct sales to end users or at...
Retail landLand used predominantly for the sale of products and services.
Retail outlet1. Any establishment where consumer products are sold, supplied, or offered for sale, directly to consumers.
Retail saleSale by a commercial owner of a wood heater to the ultimate purchaser.
Retail tradeThe Retail Trade sector comprises establishments engaged in retailing merchandise, generally without...
Retail transport emissionTypical emissions from truck, rail, water, and other-modes of transportation required to transport materials...
Retail transport emissions, see Retail transport emission
Retailer1. Any person who sells, supplies, or offers aerosol coating products for sale directly to consumers...
Retained recordsIn NARA's usage, older records in an agency's custody that are scheduled as permanent but overdue for...
RetainersPlastic or steel retaining caps that prevent soil cores from falling out of sample barrel when they are...
Retaining wallWall built to hold back soil or rock, allowing adjacent areas to be held securely at different elevations.
Retan-Wet finishFinal processing steps performed on a tanned hide including, but not limited to, the following wet processes...
RetardationPreferential retention of contaminant movement in the subsurface resulting from adsorptive processes or...
Retarder soundSound which is heard and identified by the observer as that of a retarder, and that causes a sound level...
Retarding agentAgent used to slow the setting of cement during construction
RetentionAn outcome effect that describes the degree to which measures or practices are retained in use after they are...
Retention basinA retention basin, also called a wet pond, is an impoundment that is designed to maintain a permanent pool of...
Retention periodThe length of time that records are to be kept. See also DISPOSITION (1).
Retention rateThe amount of recovered material that is transformed into a recycled product, relative to the total amount of...
Retention time1. In chromatography, the time between when a sample is injected and the time the chromatographic peak is...
Retina1. The sensory membrane that lines most of the large posterior chamber of the vertebrate eye, is composed of...
Retinal arteryCentral retinal artery and its branches. It arises from the ophthalmic artery, pierces the optic nerve and...
Retinal veinCentral retinal vein and its tributaries. It runs a short course within the optic nerve and then leaves and...
RetinoblastomasTumors of the eye.
Retinoic acid bindingRetinoic Acid Binding consists of a biophysical interaction between retinoic acid (ligand) and a biological...
Retinoid receptor bindingA process that involves the binding of a retinoid to an intracellular retinoid receptor. These interactions...
RetinoidsA group of tetraterpenes, with four terpene units joined head-to-tail. Biologically active members of this...
Retired gas insulating equipmentEither any gas insulated equipment including hermetically-sealed pressure switchgear, that is energized at...
RETIREMENTThe transfer of records to agency storage facilities or a Federal records center. See also ACCESSION (2)...
Retirement ratioFactor applied to pollutant reduction credits to accelerate water quality improvement. The ratio indicates...
Retiring an applianceWhen referring to an appliance, means the removal of the refrigerant and the disassembly or impairment of the...
RetortAirtight pressure vessel, typically a long horizontal cylinder, used for the pressure impregnation of wood...
Retractable tipA steel tip that is connected to the DP rods so that it can be detached at a designated depth while still...
Retread tireWorn automobile, truck, or other motor vehicle tire whose tread has been replaced.
RetreatOne of three possible responses to sea-level rise, which involves adapting to shoreline change rather than...
RetrofillRemove PCB or PCB-contaminated dielectric fluid and to replace it with either PCB, PCB-contaminated, or...
Retrofit1. Addition of a pollution control device on an existing facility without making major changes to the...
Retrofit device manufacturerPerson or company which is engaged in the business of producing or assembling, and which has primary control...
Retrofit evaluation programSequence of analyses and tests prescribed by the Administrator as described in § 610.13 in order to evaluate...
Retrofit/Rebuild EquipmentEquipment certified in accordance with the certification regulations contained in this subpart.
RetrofitsInstallation of a new or redesigned stormwater facility to treat stormwater from existing impervious area...
Retrofitted configurationTest configuration after adjustment of engine calibrations to the retrofit specifications and after all...
Retro-fitted water systemExisting water delivery system to which new technologies or features have been added
Retrofitting an appliance1. To convert an appliance from one refrigerant to another refrigerant. Retrofitting includes the conversion...
Retrofitting an automobileAddition of a new item, modification or removal of an existing item of equipment beyond that of regular...
Retrospective case study1. A study of sites where hydraulic fracturing has occurred nearby, with a focus on sites with reported...
Retrospective risk assessment1. An evaluation of the causal linkages between observed ecological effects and stressor(s) in the...
Retrospective study1. An epidemiological study which compares diseased persons with non-diseased persons and works back in time...
Retro-transcribing virusA virus which replicates by reverse transcription of a RNA or DNA intermediate. All retro-transcribing...
RetrotranspositionAny DNA Integration in which the donor molecule is a retrotransposon.
Retrovirus1. A type of virus that stores its genetic information in a single-stranded RNA molecule and constructs a...
Return airAir removed from a space to be then recirculated or exhausted.
Return alleyThe alley through which cows must pass when moving from the milking parlor back to the cow housing area after...
Return flow1. That part of a diverted flow that is not consumptively used and returned to its original source or another...
Return land to productive business or industrial useThe planning and execution of programs at the federal, state, and local/tribal level to conduct studies...
Return land to productive community useThe planning and execution of programs at the federal, state, and local/tribal level to conduct studies...
Return wallsWalls constructed at the ends of seawalls, bulkheads, or revetments perpendicular to the shoreline to prevent...
Returned mining overburdenAny material overlying an economic mineral deposit which is removed to gain access to that deposit and is...
ReusableComponents, services or other resources that have the potential to be reused by an application or a...
Reusable component servicesThis repository provided a central point of access to a broad range of IT resources, components, and services...
Reuse1. Refers to the use of a product or component of municipal solid waste in its original form more than once...
Reuse assessmentA reuse assessment involves the collection and evaluation of information to develop assumptions about...
Re-use planPreparation of the re-use plan, a document required by the Base Realignment and Closure Acts (BRAC 1-5) that...
Reuse (water)Beneficial use of treated wastewater.
Revealed preferencePreference revealed through buying behavior.
Revealed preference methodA method for valuation that uses buyer behaviors to determine value.
RevenueFunds earned by the system through the sale of water or by other means.
Revenue collectionRevenue Collection includes the collection of government income from all sources. Note: Tax collection is...
Revenue Surplus/DeficitThe difference between the total cost of doing business and the funds received from fees, loans, and grants...
Revenue-producing waterWater metered and sold.
Reverberatory furnace1. Includes the following types of reverberatory furnaces: stationary, rotating, rocking, and tilting.
Reverberatory smelting furnaceAny vessel in which the smelting of copper sulfide ore concentrates or calcines is performed and in which the...
ReversalA typical distortion of normal-resistivity logs opposite beds that are thinner than the AM spacing; the...
ReverseThe opposite of what you see. Type your name on a white sheet of paper in black ink. The reverse of this...
Reverse dosimetryUses human pharmacokinetic models to convert biomarker measurements to dose levels that are comparable to an...
Reverse estuarine flowAn estuarine circulation where evaporation greatly exceeds freshwater input, as in hot dry climes, salinity...
Reverse osmosis1. A membrane separation process designed to treat wastewater containing a variety of contaminants including...
Reverse osmosis reject waterWaste water released from the reverse osmosis process.
Reverse transcriptase-polymerase chain reaction1. A laboratory test that measures the amount of the virus RNA (also known as viral load) in a blood sample...
Reverse transcription inductionReverse Transcription Induction involves initiation of activities involved in copying RNA into DNA by reverse...
Reverse transcription inhibitionReverse Transcription Inhibition involves interference with, or restraint of, activities involved in copying...
Reverse transcription process1. In biology, the process in cells by which an enzyme makes a copy of DNA from RNA. The enzyme that makes...
Reversible effect1. An effect which is not permanent, especially adverse effects which diminish when exposure to a toxic...
Reversionary interestA real estate interest created when a landowner deeds property to another, but the deed specifies that the...
Revetment1. A sloped facing of stone, concrete, etc., built to protect a scarp, embankment, or shore structure against...
Reviewto examine or inspect
Review areaArea surrounding an injection well described according to the criteria set forth in § 146.06 or in the case...
Review officerThe EPA Administrator or his delegatee who is authorized to exercise all powers and duties prescribed or...
ReviewerA person responsible for approving the initial deposit of an author manuscript into NIHMS and then approving...
Reviewing agencyA State agency with an approved permitting program under Title V of the Act. An EPA Regional Office is the...
Reviewing authority1. Administrator or an Indian Tribe in cases where a Tribal agency is assisting EPA with administration of...
Reviewing officialGeneral Counsel of the Authority or his designee who is - (a) Not subject to supervision by, or required to...
Revision checklist linkage tableThis table shows which Revision Checklists are related (i.e., which checklists affect similar sections of...
Revision (rule) checklistsA document based on specific Federal rules published in the Federal Register that addresses changes made to...
Revoke1. To terminate the certificate or an exemption for an emission family. If we revoke a certificate or...
Revolving fundsFinancing tool that recycles funds by providing loans, receiving loan repayments, and then providing further...
Revolving loan fundCapitalized fund, typically maintained by a state government, that provides low-interest loans for energy...
Revolving loan fundsA capitalized fund, typically maintained by a state government, that provides low-interest loans for energy...
Rewind stationUnit from which substrate is collected at the outlet of a web coating line.
Reynoutria sachalinensisCauses the plants to activate an internal defense system that prevents growth of certain fungi, especially...
Reynoutria sachalinensis extract(giant knotweed) is to be used as a spray on greenhouse grown ornamental plants for the purpose of boosting...
RF1 reach segmentThe reach segment portion of the reach index system.
RFA completedThe event by which the RFA is completed.
RFA initiationThe event by which the State or EPA starts to conduct an RFA.
RhabdoviridaeA family of bullet-shaped viruses of the order MONONEGAVIRALES, infecting vertebrates, arthropods, protozoa...
Rhamnus catharticaCommon buckthorn is a shrub or small tree that can grow to 22 feet in height and have a trunk up to 10 inches...
Rhaponticum repensCrowds out native species; toxic to horses.
RheokinesisMovement in relation to water currents.
RheotaxisOrientation to water currents. An animal may face into the current (positive rheotaxis) or face downstream of...
RhizineRoot-like structure of lichen and other organisms.
RhizobenthosOrganisms rooted in the substratum.
RhizobiumA genus of gram-negative, aerobic, rod-shaped bacteria that activate PLANT ROOT NODULATION in leguminous...
Rhizoctonia solaniRhizoctonia solani has perhaps the widest host range of any pathogen, attacking most cultivated crops...
Rhizomatous plantA plant that reproduces by rhizomes. Rhizomes are a horizontal underground stem, usually sending out roots...
Rhizome1. The underground portion of a plant's stem. Rhizomes are usually thick and horizontal, produce roots and...
RhizomorphA specialized form of mycelium produced by certain fungi (e.g. Armillaria spp.) consisting of several strands...
Rhizopus oryzaeUsed to prepare Carbohydrase.
Rhizosphere bacteriaBacteria of the soil surrounding and directly influenced by plant roots.
Rhizosphere fungusFungi in the soil surrounding and directly influenced by plant roots.
Ribbon photovoltaic cellType of photovoltaic device made in a continuous process of pulling material from a molten bath of...
Ribonucleic acid1. A molecule that carries the genetic message from DNA to a cellular protein-producing mechanism.
Ribosomal DNADNA sequences encoding RIBOSOMAL RNA and the segments of DNA separating the individual ribosomal RNA genes...
Ribosomal interactionRibosomal Interaction involves temporary non-covalent binding between biomolecules and ribosomes.
Ribosomal ribonucleic acid1. The most abundant form of RNA. Together with proteins, it forms the ribosomes, playing a structural role...
Ribosomal RNA1. A RNA molecule that does not contain protein-coding sequence information and constitutes the majority of...
Ribosome1. A ribosome is a cellular particle made of RNA and protein that serves as the site for protein synthesis in...
Ribosome assembly interferenceRibosome Assembly Interference involves inhibition or restraint of the formation of ribosomes.
Rice (Food)Rice delivered to a plant before processing.
Rich burn four stroke engineFour-stroke spark ignited reciprocating internal combustion engine where the manufacturer's recommended...
RichelieuThe Riviere Richelieu Basin, including Lake Champlain drainage, within the United States. New York, Vermont...
Ridge1. A long, narrow elevation, usually sharp crested with steep sides. Larger ridges can form an extended...
Ridge tillage1. The soil is left undisturbed from harvest to planting except for strips up to 1/3 of the row width...
Riffle1. A rocky shoal or sand bar located just below the surface of the water.
Riffle and pool complexSteep gradient sections of streams are sometimes characterized by riffle and pool complexes. Such stream...
Riffle and pool complexes, see Riffle and pool complex
Riffle (Placer Mining)Obstacles placed along the bottom of a sluice or rocker that form pockets to catch gold by concentrating...
Riffle zone reconstructionRebuilding an area of stream rapids
Rift zoneA region of Earth's crust along which divergence is taking place. A linear zone of volcanic activity and...
Rigging upPlacing and assembling the various parts of equipment that make up the rig, and preparing the rig for...
Right-of-wayThe cleared area along the road alignment that contains the roadbed, ditches, road slopes, and back slopes.
RightsA legal or moral entitlement. Rights generally imply duties or obligations. For example, if A has a right not...
Rill1. A small channel eroded into the soil surface by runoff, rills easily can be smoothed out (obliterated) by...
Rill erosion1. The removal of soil by concentrated water running through little streamlets, or headcuts. Detachment in a...
Rim sealDevice attached to the rim of a floating roof deck that spans the annular space between the deck and the wall...
RinderpestA viral disease of cloven-hoofed animals caused by Morbillivirus (Rinderpest virus). It may be acute...
Ring canala part of the water vascular system of echinoderms. Specifically, a circumoral ring around the esophogus with...
Ring carrierAny plastic ring carrier device that contains at least one hole greater than 13/4 inches in diameter which is...
Ring carriers processorPersons or entities that produce ring carriers ready for use as beverage carriers.
Ring closing metathesisReactions, with metal catalysts, used to synthesis unsaturated rings
Ring feederA steel hoop with individual head gates that may be placed over a large round bale of hay when feeding it.
Ringlemann chartA series of shaded illustrations used to measure the opacity of air pollution emissions, ranging from light...
RingwormFungal infection of keratinized tissues such as hair, skin and nails.
RinsateLiquid resulting from the rinsing of the interior of any equipment or container that has come in direct...
Rio Grande closed basinsThe Estancia, Tularosa Valley, Salt Basin and other closed basins lying between the Rio Grande and the Pecos...
Rio Grande headwatersThe Rio Grande Basin from its headwaters to the river's intersect with the Colorado-New Mexico state line...
Rio Grande regionThe drainage within the United states of: (a) the Rio Grande Basin, and (b) the San Luis Valley, North...
Rio Grande-AmistadThe drainage within the United states of the Rio Grande Basin from the Junction of the Mexico, New Mexico...
Rio Grande-Elephant ButteThe Rio Grande Basin from the Colorado-New Mexico state line to and including Elephant Butte Reservoir, and...
Rio Grande-FalconThe drainage within the United states of the Rio Grande Basin from Amistad Reservoir to and including Falcon...
Rio Grande-MimbresThe drainage within the United states of the Rio Grande Basin from Elephant Butte Reservoir to the junction...
Riot control agent1. Highly irritating agents normally used by law enforcement for crowd control or by individuals for...
Rip current1. A strong, narrow current of surface water that flows seaward through the surf into deeper water.
Riparian1. Areas adjacent to rivers and streams. These areas often have a high density, diversity, and productivity...
Riparian area1. Vegetated ecosystems along a waterbody through which energy, materials, and water pass. Riparian areas...
Riparian areas, see Riparian area
Riparian buffer1. A specific area to be managed within a riparian area.
Riparian disturbanceA measure of the evidence of human activities in and alongside streams, such as dams, roadways, pastureland...
Riparian forest bufferTrees, shrubs and other vegetation located along the edge of rivers, streams and other waterways that filter...
Riparian forest buffers, see Riparian forest buffer
Riparian habitat1. Areas adjacent to rivers and streams with a differing density, diversity, and productivity of plant and...
Riparian rights1. Entitlement of a land owner to certain uses of water on or bordering his property, including the right to...
Riparian vegetation1. Hydrophytic vegetation growing in the immediate vicinity of a lake or river closely enough so that its...
Riparian vegetative coverVegetation corridor alongside streams and rivers. Intact riparian vegetative cover reduces pollution runoff...
Riparian water rights1. The rights of an owner whose land abuts water. They differ from state to state and often depend on whether...
Riparian zone1. The border or banks of a stream. Although this term is sometimes used interchangeably with floodplain, the...
Riprap1. A protective layer or facing of quarrystone placed to prevent erosion, scour, or sloughing of an...
Rise time, T 10-90Time interval of a measurement instrument's response after any step increase to the input between the...
Risk1. The expected frequency or probability of undesirable effects resulting from exposure to known or expected...
Risk acceptanceExplicit or implicit decision not to take an action that would affect all or part of a particular risk.
Risk (adverse) for endangered speciesRisk to aquatic species if anticipated pesticide residue levels equal one-fifth of LD10 or one-tenth of LC50...
Risk advisoryNon-regulatory document that communicates risk information to those who may have to make risk management...
Risk analysisA detailed examination including risk assessment, risk evaluation, and risk management alternatives...
Risk Assessment1. A process to determine the increased risk from exposure to environmental pollutants together with an...
Risk assessment guidanceSee http://www.epa.gov/osweroe1/content/rmp/. Facilities are required to submit risk management plans (RMP)...
Risk assessment (human health), see Risk Assessment
Risk assessment methodology for water utilitiesA methodology for conducting vulnerability assessment programs for drinking water utilities.
Risk assessment process1. A process to determine the increased risk from exposure to environmental pollutants together with an...
Risk assessment typeThe type of qualitative or quantitative evaluation of the environmental and/or health risk resulting from...
Risk assessment work planA document that outlines the specific methods to be used to assess risk, and the protocol for presenting risk...
Risk assessor1. The person who analyzes information from a cleanup/Superfund site to determine if there is the possibility...
Risk avoidanceStrategies or measures taken that effectively remove exposure to a risk. [DHS Risk Steering Committee Risk...
Risk by type1. The probability of adverse effects resulting from exposure to an environmental agent.
Risk calculationA way of numerically estimating the possibility of risk to the environment using ecotoxicological benchmarks.
Risk characterization1. A phase of risk assessment that integrates the results of the exposure and effects analyses to evaluate...
Risk communication1. The process of exchanging information about levels or significance of health or environmental risk.
Risk description1. Risk description provides information important for interpreting the risk results and identifies a level...
Risk descriptorA statistic (e.g., arithmetic mean, 95th percentile) that describes the risk to the assessment endpoint.
Risk estimate1. A description of the probability that organisms exposed to a specified dose of chemical will develop an...
Risk estimation1. Risk estimation is the combination of an exposure profiles and exposure-effects in an ecological risk...
Risk evaluation1. A component of risk assessment in which judgments are made about the significance and acceptability of...
Risk factor1. A characteristic (e.g., race, sex, age, obesity) or variable (e.g., smoking, exposure) associated with...
Risk for non-endangered speciesRisk to species if anticipated pesticide residue levels are equal to or greater than LC50.
Risk groupGroup within a community at high risk for particular diseases or conditions due to the environmental...
Risk (human health), see Risk
Risk hypothesesProposed answers to questions risk assessors have about what responses assessment endpoints will show when...
Risk hypothesisProposed answers to questions risk assessors have about what responses assessment endpoints will show when...
Risk identificationRecognizing that a hazard exists and trying to define its characteristics. Often risks exist and are even...
Risk Management1. Decisions about whether an assessed risk is sufficiently high to present a public health concern and about...
Risk management alternatives developmentProcess of systematically examining risks to develop a range of options and their anticipated effects for...
Risk management (human health), see Risk Management
Risk management methodologySet of methods, principles, or rules used to identify, analyze, assess, and communicate risk, and accept...
Risk management planRisk management plan required under subpart G of this part.
Risk management plan facility proximity1. The environmental burden indicator for RMP facility proximity measures how close people might live to an...
Risk management plans, see Risk management plan
Risk manager1. The person who makes decisions concerning how to proceed with the cleanup process in response, in part, to...
Risk matrixTool for ranking and displaying components of risk in an array.
Risk monitoringProcess of following up the decisions and actions within risk management in order to ascertain that risk...
Risk perceptionSubjective judgment about the characteristics and/or severity of risk.
Risk profile1. A description of a food safety problem and its context so as to guide further risk management action.
Risk ratioA measure of association that quantifies the association between an exposure and a health outcome from an...
Risk reductionActions that can decrease the likelihood that individuals, groups, or communities will experience disease or...
Risk scenarioHypothetical situation comprised of a hazard, an entity impacted by that hazard, and associated conditions...
Risk specific doseThe dose associated with a specified risk level.
Risk typeA facility (a site known to hold or discharge a contaminant) or event (such as a combined sewer overflow)...
Risk-based ConcentrationsAn estimate of a health-based air concentration of a chemical that a person or ecosystem could be exposed to...
Risk-based corrective actionAs defined by EPA, RBCA is a streamlined approach through which exposure and risk assessment practices are...
Risk-based decision making1. Determination of a course of action predicated primarily on the assessment of risk and the expected impact...
Risk-based DosesAn estimate of a health-based, media-specific concentration (e.g., soil or water) of a chemical that a person...
Risk-based framingPlanning based on the pros and cons of a given set of possibilities; includes assessment of a risk in terms...
Risk-based TargetingThe direction of resources to those areas that have been identified as having the highest potential or actual...
Risk-benefit analysis1. A formal comparison of the short- and long-term risks to the overall societal benefits of an activity...
Risk/Health AssessmentAt each site, EPA determines the possibility for human and ecological contact (i.e., exposure) with...
Risk-informed decision makingDetermination of a course of action predicated on the assessment of risk, the expected impact of that course...
Risk-relatedRSEI produces three main types of results: pounds-based, hazard-based, and risk-related. Risk-related results...
RisperidoneA selective blocker of DOPAMINE D2 RECEPTORS and SEROTONIN 5-HT2 RECEPTORS that acts as an atypical...
Ritter reactionMethod for making a N-alkyl amide
Ritualized behaviora behavior that once served its own purpose but has come to act as a signal about that purpose. For example...
Rival goodsA good the enjoyment or benefit of which by one person reduces another person's ability to enjoy or benefit...
RiverA natural stream of water of considerable volume, larger than a brook or creek.
River and canalBody of water confined within the inland area, including the Intracoastal Waterways and other waterways...
River basinThe land area drained by a river and its tributaries.
River diversion1. A set of engineering approaches used to redirect the flow of river water from its natural course for a...
River floodingThe rise of a river to an elevation such that the river overflows its natural banks causing or threatening...
River plumeFormation of water resulting from the discharge of low-salinity water into marine waters of the ocean...
Riverbank protectionPreventing erosion of streambanks
River/Estuary PlumeFormation of water resulting from the discharge of low-salinity water into marine waters of the ocean...
Riverine1. Of a river, relating to or produced by a river.
Riverine estuaryThis class of estuary tends to be linear and seasonally turbid (especially in upper reaches), and it can be...
Riverine system1. All wetland and deepwater habitats contained within a channel, with two exceptions (1) wetlands dominated...
Riverine wetlandsRiverine wetlands include wetlands and deepwater habitats contained within a channel, except those areas...
Rivers, see River
RNA bindingRNA Binding is the molecular interaction between an RNA molecule and a macromolecule (usually protein or...
RNA degradationRNA degradation is a regulated cellular biochemical process that involves depolymerization of RNA...
RNA foldingThe folding of noncontiguous stretches of RNA to produce a more compact tertiary level of structure.
RNA interferenceRNA degradation is a regulated cellular biochemical process that involves depolymerization of RNA...
RNA polyadenylationThe enzymatic addition of a sequence of adenylyl residues at the 3' end of an RNA molecule.
RNA polyadenylation inhibitionRNA Polyadenylation Inhibition involves events or activities that directly hinder the covalent addition of...
RNA polyadenylation regulationRNA Polyadenylation Regulation involves cellular events or activities that directly control the covalent...
RNA processingModifications of primary RNA transcripts including: splicing, cleavage, base modification, capping and the...
RNA proof-readingRNA Proof-Reading is the process whereby RNA polymerase can backup and remove incorrect bases during the...
RNA splicing1. Removal of introns from mRNA precursors and the reattachment or annealing of exons.
RNA synthesisUsed to denote the transcription of DNA into RNA. The biochemical machinery includes sequence-specific DNA...
RNA synthesis inductionRNA Synthesis Induction consists of the initiation of activities involved in the polymeric linkage of ribose...
RNA synthesis inhibitionRNA Synthesis Inhibition involves interference with, or restraint of, the activities involved in the...
RNA transcription inhibitionRNA Transcription Inhibition involves interference with, or restraint of, the activities of the cellular...
RNA virus1. A virus whose genetic material is RNA.
RNA-Directed DNA Polymerase1. A polymerase that catalyzes the formation of complementary DNA (cDNA) from an RNA template.
RNA-Protein InteractionInteractions responsible for the assembly and stability of protein-RNA complexes. Such complexes are of...
RoadAccess and haul roads, driveways or established vehicle paths, permanent or temporary, which are graded...
Road crownA convex road surface that allows runoff to drain to either side of the road prism.
Road failureA portion or location along a forest road where generally erosion or poor construction has resulted in the...
Road oilAny heavy petroleum oil, including residual asphaltic oil used as a dust palliative and surface treatment on...
Road outslopeTo shape the road surface to cause runoff to flow toward the outside shoulder.
Road pavementHard smooth surface which is durable and allows traffic over the road.
Road prismAll parts of a road including cut banks, ditches, road surfaces, road shoulders, and road fills.
Road profile1. The cross-sectional shape of the road surface in relation to the road corridor.
Road-load coefficientSets of A, B, and C road-load force coefficients that are used in the dynamometer road-load simulation, where...
RoadwaySurfaces on which vehicles travel. This term includes public and private highways, roads, streets, parking...
Roaster1. Any facility in which a copper sulfide ore concentrate charge is heated in the presence of air to...
Roaster stackThe stack is a point of emission of the roasting operation.
Roasting1. Heating (oxidizing) process where ground chromite ore is mixed with alkaline material (such as soda ash...
Roasting operationProcess that uses an industrial furnace in which milled ore is combusted across a fluidized bed to oxidize...
Robinia pseudoacaciaBlack locust is a fast growing tree that can reach 40 to 100 feet in height at maturity. While the bark of...
Robotic parlorA completely automated system for milking cows that requires limited human contact.
RobustnessThe capacity of a model to perform well across the full range of environmental conditions for which it was...
RockA naturally-occurring solid aggregate of one or more minerals, mineraloids or, in some cases, organic...
Rock colorColor of the rock
Rock damsBarriers, often employed in conjunction with excavated pools, constructed across a drainage way or off-stream...
Rock deformation recordRecord of the folding, faulting, and other processes resulting from shear, compression, and extension of...
Rock formationA formation or body of rock

1,610 of 29,894 terms in Environment terminology (MLC-0121). Request the full dataset.