Environment terminology · MLC-0121
Environment terms: U (505)
- U. S. Land Ownership TypeThe separation of Federal and non-Federal lands and the distinction between administrative units of land...
- UbiquinoneA lipid-soluble benzoquinone which is involved in ELECTRON TRANSPORT in mitochondrial preparations. The...
- Ubiquitinated Protein DegradationUbiquitinated Protein Degradation involves the regulated covalent conjugation of one or more ubiquitin...
- UbiquitinationUbiquitin is a family of widely distributed proteins found in all eukaryotes that contain a highly conserved...
- UdderThe encased group of mammary glands provided with teats or nipples as in a cow, ewe, mare or sow. Also...
- U-factorU-factor measures the heat transfer through a window, door, or skylight and tells you how well the product...
- µg/dLMicrogram per deciliter.
- UIC Program DirectorThe chief administrative officer of any state or tribal agency or EPA Region that has been delegated to...
- Ulmus pumilaSiberian elm is a fast-growing tree in the elm family (Ulmaceae) distinguished by small toothed leaves about...
- UlnaLong bone in forearm
- Ulnar NerveA major nerve of the upper extremity. In humans, the fibers of the ulnar nerve originate in the lower...
- UlocladiumA rapidly growing, dark brown or black fungus that is a potential allergen. Its spores are unusually large...
- Ulocladium oudemansii U3 StrainA naturally occurring soil fungus existing as a saprophyte of dead and decaying plant matter. As a...
- Ultimate AnalysisDetermination of the percentages of carbon, hydrogen, nitrogen, sulfur, and chlorine and (by difference)...
- Ultimate Biochemical Oxygen DemandLong-term oxygen demand required to completely stabilize organic carbon in wastewater or natural waters.
- Ultimate Cause1. The action or policy that is responsible for creating or sustaining a source.
- Ultimate Consumer1. First commercial or non-commercial purchaser of a container or product that is not intended for...
- Ultimate FactorAspects of the environment that are directly important to the well-being of an organism (for example, food)...
- Ultimate Purchaser1. First person who in good faith purchases a product for purposes other than resale.
- UltisolsUltisols are soils that have an argillic or kandic horizon with low base saturation. They may have any soil...
- Ultra Clean CoalCoal that is washed, ground into fine particles, then chemically treated to remove sulfur, ash, silicone, and...
- Ultra Low-Emission VehicleAny light-duty vehicle or light-duty truck conforming to the applicable Ultra Low-Emission Vehicle standard...
- Ultra Low-Emitting Formaldehyde ResinResin in a composite wood product that meets the emission standards in § 770.18(c).
- Ultra low-sulfur dieselDiesel fuel that is certified to meet the standards in § 1090.305.
- Ultra Low-Sulfur Diesel Fuel1. For in-use fuels, ultra low-sulfur diesel fuel means a diesel fuel marketed as ultra low-sulfur diesel...
- ULTRAFICHEMicrofiche with images reduced more than 90 times the original.
- Ultrafiltration1. Membrane filtration process commonly used in water treatment. Membranes are primarily used for particulate...
- Ultrafiltration SystemThe device significantly reduces the sample volume by concentrating the microorganisms contained in a large...
- Ultrafine Diesel Engine ExhaustExhaust containing particulates of less than 0.1 microns
- Ultrafine particlesParticles that are generally classified as having diameters less than 0.1 µm.
- Ultra-low-flush toiletA toilet that uses not more than 1.6 gallons per flush.
- Ultra-Low-Sulfur Liquid FuelDistillate oil that has less than or equal to 15 parts per million (ppm) sulfur.
- Ultra-Sonic FlowmeterDevice that measures the mass or volumetric rate of flow of a gas, liquid, or solid moving through an open or...
- Ultrasonic MachiningForcing an abrasive liquid between a vibrating tool and a part. Particles in the abrasive liquid strike the...
- Ultrasonic TestingNondestructive test which applies sound, at a frequency above about 20 HJz, to metal, which has been immersed...
- UltravioletA portion of the electromagnetic spectrum with wavelengths shorter than visible light. The sun produces UV...
- Ultraviolet Differential Absorption LidarA lidar instrument that sends pulses of laser radiation at different wavelengths into the atmosphere to...
- Ultraviolet DisinfectionUV light used to disinfect drinking water involves (1) generating UV light with the desired germicidal...
- Ultraviolet LightElectromagnetic radiation with a wavelength between 300 and 400 nanometers.[40 CFR 59.680 (CFR 2013)][40 CFR...
- Ultraviolet Radiation1. Electromagnetic radiation with wave lengths less than visible light but greater than x-rays.
- ultraviolet rays1. Radiation from the sun in the invisible portion of the spectrum. Some UV rays (UV-A) enhance plant life...
- Ultraviolet-AUV with wavelengths 315 - 400 nm.
- Ultraviolet-BUV with wavelengths 280 - 315 nm.
- Ultraviolet-CUV with wavelengths less than 280 nm.
- UmbilicusThe depression or scar on the abdomen that marks the former site of attachment of the umbilical cord.
- Umbrella LiabilityA form of insurance protection against losses in excess of amounts covered by other liability insurance...
- UmkehrThe Umkehr (um) measurements can be used to calculate the ozone profile (ozone as a function of height).
- UnacceptableThis designation means that it is illegal to use a product as a substitute for an ODS in a specific end-use...
- Unacceptable Adverse EffectImpact on an aquatic or wetland ecosystem which is likely to result in significant degradation of municipal...
- Unaccounted-For Water1. The amount of nonaccount water less known or estimated losses and leaks.
- Unallocated SourceNot an HRS source type, rather a means of including within the hazardous waste quantity factor those...
- Unallowable CostAny cost that, under the provisions of any pertinent law, regulation, or contract, cannot be included in...
- Unassessed Waters1. Unassessed Waters are waters that have not been monitored by states, territories, and tribes for their...
- Unauthorized Dispersion TechniqueAny dispersion technique which, under section 123 of the Act and the regulations promulgated pursuant to that...
- UnbundledThe energy attribute that is separate, and may be traded separately, from the underlying electricity produced.
- Unbundled ContractThe energy attribute that is separate, and may be traded separately, from the underlying electricity produced.
- Unbundled Renewable Energy CertificateThe non-physical renewable energy certificate has been separated from the physical electricity.
- Uncalcined ClayClay that has not undergone thermal processing in a calciner.
- Uncensored Method1. Analytical methods that nearly always produce numerical values that meet qualitative identification...
- Uncertainty1. The term used in this guidance to describe lack of knowledge about models, parameters, constants, data...
- Uncertainty Analysis1. Investigates the effects of lack of knowledge or potential errors on the model (e.g., the "uncertainty"...
- Uncertainty and Variability1. One of EPA's five Assessment Factors (see definition) that describes the extent to which the variability...
- Uncertainty (Caused by Issue)Uncertainty caused by the issue itself. Its outcomes or alternatives.
- Uncertainty (Caused by Source)Uncertainty caused by things such as incomplete information and inadequate understanding.
- Uncertainty, Counting (radiochemistry)The component of measurement uncertainty attributable to the random nature of radioactive decay and radiation...
- Uncertainty, ExpandedQuantity defining an interval about the result of a measurement that may be expected to encompass a large...
- Uncertainty Factor1. One of several, generally 10-fold, default factors used in operationally deriving the RfD and RfC from...
- Uncertainty FactorsFactors used in the adjustment of toxicity data to account for unknown variations. Where toxicity is measured...
- Uncertainty LocusIn whose mind the uncertainty exists.
- Uncertainty of Measurement1. A parameter associated with the result of a measurement that characterizes the dispersion of the values...
- Uncertainty QuantificationIEM models require both knowledge and uncertainty from different system components to be integrated into a...
- Uncertainty RatioFactor applied to pollutant reduction credits generated by nonpoint sources that accounts for lack of...
- Uncertainty, Standard (radiochemistry)An estimate of the measurement uncertainty expressed as a standard deviation. {OW/TSC}
- Uncertainty/variability factorOne of several, generally 10-fold, default factors used in operationally deriving the RfD and RfC from...
- Uncertified PersonAny person who is not holding a currently valid certification document indicating that he is certified under...
- Uncombined WaterDroplets of water that have not combined with hygroscopic particles or do not contain dissolved solids.
- Uncommon Variety MineralMineral materials that have a special quality, quantity, character, or locationHelp location See "claim."...
- uncommon variety mineralsMineral materials that have a special quality, quantity, character, or location that makes them of unique...
- unconfinedConditions in which the upper surface of the zone of saturation forms a water table under atmospheric...
- Unconfined Aquifer1. An aquifer in which there are no confining beds between the capillary fringe and land surface, and where...
- Unconsolidated BluffA steep bank or cliff made of clay, till, or other sediments.
- unconsolidated bluffsA steep bank or cliff made of clay, till, or other sediments.
- Unconstrained Dose-Response ModelNo restrictions imposed on the estimates of parameters.
- Uncontrolled Coating LineCoating line consisting of only never-controlled work stations.
- Uncontrolled Coating OperationCoating operation from which none of the organic HAP emissions are routed through an emission capture system...
- Uncontrolled EmissionOrganic HAP process vent emissions or metal HAP process vent emissions, as applicable, at the outlet of the...
- Uncontrolled Fluorinated Greenhouse Gas EmissionGas stream containing fluorinated GHG which has exited the process (or process condenser or control...
- Uncontrolled Hazardous Air Pollutant EmissionGas stream containing HAP which has exited the process (or process condenser, if any), but which has not yet...
- Uncontrolled Hazardous Waste Site1. Means any site where hazardous wastes or other hazardous substances have been released, abandoned, or...
- Uncontrolled Loading RackLoading rack used to load gasoline cargo tanks that is not a controlled loading rack.
- Uncontrolled Organic Hazardous Air Pollutant EmissionOrganic HAP emitted from a unit operation prior to introduction of the emission stream into a control device...
- Unconventional resource1. An umbrella term for oil and natural gas that is produced by means that do not meet the criteria for...
- Uncovered Finished Water Storage FacilityTank, reservoir, or other facility used to store water that will undergo no further treatment to reduce...
- Undenatured EthanolLiquid that meets one of the definitions in paragraph (1) of this definition: (1)(i) Ethanol that has not...
- Underarm AntiperspirantAny aerosol product that is intended by the manufacturer to be used to reduce perspiration in the human...
- Underarm DeodorantAny aerosol product that is intended by the manufacturer to be used minimize odor in the human axilla by...
- Underbody Anti-Chip CoatingAnti-chip coating applied to the underbody or wheel wells primarily for the purpose of protecting these areas...
- Underbody CoatingCoating designed for protection and sound deadening that is typically applied to the wheel wells and...
- UnderclayThe soil in which the trees or other coal-forming swamp vegetation was rooted.
- UndercoaterCoating formulated and recommended to provide a smooth surface for subsequent coatings.
- Under-Cowl Fuel LineFuel line that is entirely contained within the cowl of an outboard engine. This does not include a fuel line...
- UndercurrentA wide, flat sluice box placed beneath the main sluice box used to save fine gold.
- Underfire AirAny forced or induced air, under control as to quantity and direction, that is supplied from beneath and...
- UnderflowThe lateral motion of water through the upper layers until it enters a stream channel. This usually takes...
- Underground AreaUnderground room, such as a basement, cellar, shaft or vault, providing enough space for physical inspection...
- Underground Coal MineA mine where coal is produced by tunneling into the earth to the coalbed, which is then mined with...
- Underground DetentionUnderground vaults, storage cells, or water piping systems used for stormwater flow rate and volume control...
- Underground InfiltrationUnderground infiltration includes a variety of proprietary and non-proprietary practices that are usually...
- Underground Injection1. Subsurface emplacement of fluids through a bored, drilled or driven well; or through a dug well, where the...
- Underground Injection Control1. Activities to support state, local, and tribal governments to prevent contamination of drinking water...
- Underground Injection Control PermitPermit issued under the authority of Part C of the Safe Drinking Water Act at 42 U.S.C. 300h et seq.
- Underground Injection Control Program1. Program responsible for regulating the construction, operation, permitting, and closure of injection wells...
- Underground injection control well1. Units into which hazardous waste is permanently disposed of by injection 0.25 miles below an aquifer with...
- Underground Injection Well1. A constructed system designed to place waste fluids above, into, or below aquifers classified as...
- Underground Injection WellsSteel- and concrete-encased shafts into which hazardous waste is deposited by force and under pressure.
- Underground MineMine where coal is produced by tunneling into the earth to the coalbed, which is then mined with underground...
- Underground ReleaseAny belowground release.
- Underground Source of Drinking Water1. An aquifer or portion of an aquifer that supplies any public water system or that contains a sufficient...
- Underground Sources of Drinking WaterAquifers currently being used as a source of drinking water or those capable of supplying a public water...
- Underground StorageSubsurface facilities utilized for storing natural gas that has been transferred from its original location...
- Underground Storage Tank1. A tank and any underground piping connected to the tank that has 10% or more of its volume (including pipe...
- Underground Storage Tank OperatorAny person in control of, or having responsibility for, the daily operation of the UST system.
- Underground Storage Tank RemovalResponse action that requires expeditious attention to reduce imminent and substantial dangers to human...
- Underground Storage Tank System1. A tank and any underground piping connected to the tank that has at least 10 percent of its combined...
- Underground Storage Tanks1. A tank and any underground piping connected to the tank that is used to contain an accumulation of...
- Underground Storage VesselStorage vessel stored below ground. [40 CFR 60.5430b (CFR 2024)]
- Underground Tank1. Device meeting the definition of “tank” in § 260.10 whose entire surface area is totally below the surface...
- Underground Uranium MineMan-made underground excavation made for the purpose of removing material containing uranium for the...
- Underground Uranium MiningThe mining process that involves extracting rock through a tunnel or opening in the side of a hill or...
- Underhood Label IDLocated on a label in the engine compartment, the label indicates engine family or EPA vehicle test group.
- Underlying Hazardous Constituent1. Any constituent listed in 40 CFR 268.48, "Table UTS - Universal Treatment Standards", except fluoride...
- Underlying Hazardous ConstituentsConstituents that must be treated in order to meet contaminant-specific levels for purposes of the LDR...
- Undersea Weapons Systems Specialty CoatingAny coating applied to any component of a weapons system intended to be launched or fired from under the sea.
- Understory1. The layer of forest located underneath the canopy. Here, smaller trees and shrubs grow, replacing older...
- Undertow1. Seaward-directed current generated by water that is receding from the shoreline after wave run up.
- Undertread Cementing OperationSystem used to apply cement to a continuous strip of tread or combined tread/sidewall component. An...
- UnderutilizationReduction, during any calendar year in Phase I, of the heat input (expressed in mmBtu for the calendar year)...
- Underwater Ship HusbandryDischarge from the grooming, maintenance, and repair of hulls and hull appendages performed while a vessel is...
- UnderwriterA person trained in evaluating risks and determining the rates and coverages that will be used for them.
- UnderwritingThe process of selecting risks for insurance and determining in what amounts and on what terms the insurance...
- Undetermined DocumentationEPA is in the process of obtaining information documenting the most recent activity from the State or Federal...
- Undiscovered Petroleum ResourceResources postulated from geologicinformation and theory to exist outside of known oil and gas fields.
- Undisturbed PerformancePredicted behavior of a disposal system, including consideration of the uncertainties in predicted behavior...
- Undisturbed Yucca Mountain Disposal SystemYucca Mountain disposal system is not affected by human intrusion.
- Undue BurdenUndue burden means significant difficulty or expense. In determining whether an action would result in an...
- Undulant FeverInfection caused by bacteria of the genus BRUCELLA mainly involving the MONONUCLEAR PHAGOCYTE SYSTEM. This...
- Unemployed PersonPersons aged 16 years and older who had no employment during the reference week, were available for work...
- UnemploymentAll those who did not have a job at all during the reporting period, made at least one specific active effort...
- Unequal ProbabilityOften it is desirable to select units from the target population with different (unequal) inclusion...
- Unexpended Article 5 AllowanceArticle 5 allowances that have not been used. At any time in any control period a person's unexpended Article...
- Unexpended Consumption AllowanceConsumption allowances that have not been used. At any time in any control period a person's unexpended...
- Unexpended Critical Stock AllowanceCritical stock allowances against which methyl bromide has not yet been sold for an approved critical use.
- Unexpended Critical Use AllowanceCritical use allowances against which methyl bromide has not yet been produced or imported. At any time in...
- Unexpended Destruction and Transformation CreditDestruction and transformation credits that have not been used. At any time in any control period a person's...
- Unexpended Essential-Use AllowanceEssential-use allowances that have not been used. At any time in any control period a person's unexpended...
- Unexpended Export Production AllowanceExport production allowances that have not been used. A person's unexpended export production allowances are...
- UNEXPENDED FEDERAL FUNDSFederal funds obligated but not yet disbursed. Represents the difference between the amount of EPA funds...
- Unexpended HCFC-141b Exemption AllowanceHCFC-141b exemption allowances that have not been used. A person's unexpended HCFC-141b exemption allowances...
- Unexpended Production AllowanceProduction allowances that have not been used. At any time in any control period a person's unexpended...
- Unexploded Ordnance1. The term exploded ordnance refers to any munition, weapon delivery system, or ordnance item that contains...
- Unfinished Oil1. All oils requiring further processing, except those requiring only mechanical blending.
- Unfinished oilsAll oils requiring further refinery processing, except those requiring only mechanical blending. Includes...
- Unfit-for-Use Tank SystemTank system that has been determined through an integrity assessment or other inspection to be no longer...
- Unfunded Mandates Reform ActTo curb the practice of imposing unfunded Federal mandates on States and local governments; to strengthen the...
- UNICORtrade name for the FPI (Federal Prisons Industries)
- UnificationCombining molecules through alkylation and polymerization.
- uniform distribution1. The general formula for the probability density function of the uniform distribution is f(x) = 1/(B-A) for...
- Uniform Finish BlenderCoating designed to blend a repaired topcoat into an existing topcoat.
- Uniform PortionUniform portion of a standardized permit consists of terms and conditions, relevant to the unit(s) you are...
- Uniform RateA pricing structure for which the dollar amount charged per unit of water (such as dollars per gallon) does...
- Uniform Resource LocatorA Uniform Resource Locator is the address of an Internet file which includes the service protocol or IP...
- Uniform Water RatePricing structure for which the dollar amount charged per unit of water (such as dollars per gallon) does not...
- Unilateral Admin OrderAdministrative order issued by EPA that can direct potentially responsible parties (PRPs) to conduct removal...
- Unilateral Administrative OrderA legal document signed by EPA directing the PRPs to take corrective action or refrain from an activity. It...
- unilateral administrative ordersA legal document issued by EPA directing a potentially responsible party to perform site cleanup. A UAO sets...
- Uninstalled EngineEngine not installed in, or an integrated part of, the final product.
- Unintended Social ImpactUnanticipated effect on some sector of society such as employment
- Unintentional InjuryAn accidental injury
- Unique FarmlandRefers to soils designated by the Natural Resources Conservation Service is land other than prime farmland...
- Unique identifierA unique string of letters and numbers associated with a term. Unique identifiers (UUIDs) are source specific...
- UnitThis is the code that represents the unit for measuring the sample.
- Unit Acquisition CostNet invoice unit price of the property including the cost of modifications, attachments, accessories, or...
- Unit Cancer RiskEstimate of the lifetime risk caused by each unit of exposure in the low exposure region.
- Unit HydrographThe hydrograph of one inch of storm runoff generated by a rainstorm of fairly uniform intensity within a...
- Unit of AnalysisThe class of elemental units that constitute the population and the units selected for measurement; also, the...
- Unit of MeasureA predetermined quantity (as of length, time, or heat) adopted as a standard of measurement.
- Unit of MeasurementUnits used to define the amount of something, e.g., mg/L (chemistry), pCi/L and mrem/year (radiochemistry)...
- Unit Operation1. Those processing steps that occur within distinct equipment that are used, among other things, to prepare...
- Unit PackagingPackage that is labeled with directions to use the entire contents of the package in a single application.
- Unit Participation Power Sales AgreementUnit participation power sales agreement under which a utility or industrial customer reserves, or is...
- Unit Risk1. The upper-bound excess lifetime cancer risk estimated to result from continuous exposure to an agent at a...
- Unit Risk Estimate1. The upper-bound excess lifetime cancer risk estimated to result for continuous exposure to an agent at a...
- Unit Startup1. Period when a municipal waste combustion unit begins the continuous combustion of municipal solid waste...
- Unit VentilatorA fan-coil unit package device for applications in which the use of outdoor- and return-air mixing is...
- Unit-Based PricingSystems under which residents pay for municipal waste management and disposal services by weight or volume...
- Unit-Based Pricing/Pay-As-You-ThrowRefers to a system under which residents pay for municipal solid waste management services per unit of waste...
- United Nations Framework Convention on Climate Change1. The Convention on Climate Change sets an overall framework for intergovernmental efforts to tackle the...
- United StatesThe States, the District of Columbia, the Commonwealth of Puerto Rico, the Canal Zone, Guam, American Samoa...
- United States Department of EnergyDepartment of Energy [40 CFR 191.02 (CFR 2018)][40 CFR 194.2 (CFR 2018)]40 CFR 197.2 (CFR 2018)
- United States Environmental Protection Agency1. United States Environmental Protection Agency. [40 CFR 122.2 (CFR 2013)][40 CFR 144.3 (CFR 2018)]
- United States Interim StorageAfter use in the reactor, fuel assemblies become highly radioactive and must be removed and stored under...
- United States ManufacturerPerson who produces or manufactures in the United States.
- United States Parent Company1. Highest-level United States company(s) with an ownership interest in the facility or supplier as of...
- Univariate AnalysisAn analysis of a single variable.
- Univariate Normal DistributionA normal distribution which models only a single variable of interest. Like the normal distribution, its...
- Universal MeteringMetering of all water-service connections.
- Universal PrecautionRecommendations issued by CDC to minimize the risk of transmission of bloodborne pathogens, particularly HIV...
- Universal Resource LocatorA specific character string that constitutes a reference to an Internet resource.
- Universal ServiceThe financial mechanism which helps compensate telephone companies or other communications entities for...
- Universal Soil Loss EquationAn equation used to predict the average rate of erosion of an area on the basis of the rainfall, soil type...
- Universal Transverse MercatorA grid-based method of specifying locations on the surface of the earth.
- Universal transverse Mercator projectionThe map projection used in many standard map series. This projection uses the Mercator projection formula on...
- Universal Treatment Standards1. These are the constituent-specific treatment standards found in §268.48.
- Universal Waste1. Means any of the following hazardous wastes that are managed under the universal waste requirements of 40...
- Universal Waste Handler1. A generator (as defined in this section) of universal waste. [40 CFR 260.10 (CFR 2013)]
- Universal Waste Large Quantity Handler1. Universal waste handler (as defined in this section) who accumulates 5,000 kilograms or more total of...
- Universal Waste Transfer Facility1. Any transportation-related facility including loading docks, parking areas, storage areas and other...
- Universal Waste Transporter1. Means a person engaged in the off-site transportation of universal waste by air, rail, highway, or water...
- Universal Wastes1. Commonly recycled wastes with special management provisions intended to facilitate recycling. There are...
- UniverseThe total entity of interest in a sampling program, often together with some structural features. The EMAP...
- UNIXMost commonly used to refer to a category of operating systems based on the operating system of the same name...
- Unlawful ActivityAn illegal action or actions
- Unleaded GasolineGasoline which is produced without the use of any lead additive and which contains not more than 0.05 gram of...
- Unliquidated Obligations1. For reports prepared on a cash basis the amount of obligations incurred by the grantee that have not been...
- Unlisted Hazardous SubstanceA solid waste, as defined in 40 CFR 261.2, which is not excluded from regulation as a hazardous waste under...
- Unloaded CoastdownDynamometer coastdown run with the vehicle wheels off the roll surface.
- Unloading LegDevice which includes a bucket-type elevator which is used to remove grain from a barge or ship
- Unloading Organic Liquids OperationTransfer of organic liquids from a transport vehicle, container, or storage vessel to process components...
- Unmanaged Combustion Residual LeachateCombustion residual leachate which either: (1) Is determined by the permitting authority to be the functional...
- Unmarried PartnerA person who is not related to the householder, who shares living quarters with, and who has a close personal...
- Unmetered WaterWater delivered but not measured for accounting and billing purposes.
- unnecessary or undueA surface disturbance greater than what would normally result when an activity is being accomplished by a...
- Unnecessary or Undue Surface DisturbanceSurface disturbance greater than what would normally result when an activity is being accomplished by a...
- UNOBLIGATED BALANCEThe portion of the funds authorized by the federal awarding agency that has not been obligated by the...
- UNOBLIGATED FEDERAL FUNDSFederal funds that the recipient has not spent; the difference between the amount of EPA funds awarded to the...
- Unobtrusive MeasuresAny method of data collection in which the subjects are not aware that they are being studied.
- Unpaid Family Worker1. Persons who work without pay for 15 or more hours per week on a farm or in a business operated by a member...
- Unplanned FireFire occurring in nature without human intervention or planning, such as a wildfire ignited by a lightening...
- Unreasonable Adverse Environmental EffectAny unreasonable risk to man or the environment, taking into account the economic, social, and environmental...
- Unreasonable Marine Environmental Degradation1. Significant adverse changes in ecosystem diversity, productivity and stability of the biological community...
- Unreasonable RiskUnder the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), "unreasonable adverse effects" means...
- UNRECOVERED INDIRECT COSTThe difference between the amount awarded and the amount which could have been awarded under the recipient's...
- Unregulated ContaminantPolluting compounds not routinely required to be measured by law.
- Unrelated IndividualPerson, sharing a housing unit, who is not related to the householder by birth, marriage or adoption...
- Unsafe to Inspect EquipmentEquipment cannot be inspected without elevating the inspection personnel more than two meters above a support...
- Unsafe-to-Monitor EquipmentMonitoring personnel would be exposed to an immediate danger as a consequence of monitoring the piece of...
- Unsanitized DocumentA version of a document from which information claimed as trade secret or confidential has not been withheld...
- unsaturatedThe characteristic of a carbon atom in a hydrocarbon molecule that shares a double bond with another carbon...
- Unsaturated BromochlorofluorocarbonsFluorinated GHGs that contain only bromine, chlorine, fluorine, and carbon and that contain one or more bonds...
- Unsaturated BromofluorocarbonsFluorinated GHGs that contain only bromine, fluorine, and carbon and that contain one or more bonds that are...
- Unsaturated ChlorofluorocarbonsFluorinated GHGs that contain only chlorine, fluorine, and carbon and that contain one or more bonds that are...
- Unsaturated Hydrobromochloro-FluorocarbonsFluorinated GHGs that contain only hydrogen, bromine, chlorine, fluorine, and carbon and that contain one or...
- Unsaturated HydrobromofluorocarbonsFluorinated GHGs that contain only hydrogen, bromine, fluorine, and carbon and that contain one or more bonds...
- Unsaturated Zone1. The zone between land surface and the capillary fringe within which the moisture content is less than...
- Unscheduled Maintenance1. Any adjustment, repair, removal, disassembly, cleaning, or replacement of vehicle components or systems...
- UNSCHEDULED RECORDSRecords whose final disposition has not been approved by NARA. See also DISPOSITION (1), FINAL DISPOSITION...
- Unscheduled ShutdownUnexpected halt to facility operations for the purpose of maintenance or restoring equipment performance.
- UNSOLICITED PROPOSALAn informal written offer to perform EPA funded work for which EPA did not publish a solicitation. (40 CFR...
- Unstabilized Crude OilCrude oil that is pumped from the well to a pipeline or pressurized storage vessel for transport to the...
- Unstabilized Waste SolidOrganic materials in sewage sludge that have not been treated in either an aerobic or anaerobic treatment...
- Unstable Area1. Land subject to natural or human-induced forces that may damage the structural components of an active...
- UnstratifiedIndicates a vertically uniform or well-mixed condition in a waterbody. See also stratified.
- unstructured informationMay be defined as the direct product of human communication. Examples include natural language documents...
- Unstructured Text MiningUnstructured text mining is the parsing of text that has not been organized in any way. In a database...
- Untranslated RNA1. RNA which does not code for protein but has some enzymatic, structural or regulatory function. Although...
- Untreated Landfill GasLandfill gas that is not treated landfill gas.
- Untreated Lumber1. Wood or wood products that have been cut or shaped and include wet, air-dried, and kiln-dried wood...
- Untreated Sewage ReleaseRelease of untreated domestic or commercial waste water.
- Untreated Stormwater ReleaseRelease of storm water runoff, snow melt runoff, and surface runoff and drainage; rainfall that does not...
- Unvented Gas Space HeaterVent-free heating appliance, intended as a supplemental source of heat. Because of the dangers from the...
- Unwind StationUnit from which substrate is fed to a web coating line.
- UpA term used to describe how many similar pieces can be printed on a larger sheet; two up, four up, etc.
- Upcoming Model Year1. For an engine family the model year after the one currently in production. [40 CFR 1033.901 (CFR 2013)][40...
- UPDATABLE MICROFORMA microform to which more images can be added at any time.
- updriftRefers to the location of one section or feature along the coast in relation to another; often used to refer...
- Upfront CostInclude preacquisition or prep reduction costs incurred for processes,, products, systems, or facilities...
- upgradient1. It the direction of increasing static (potentiometric) head.
- Upland1. An area of the terrestrial environment that does not have direct interaction with surface waters.
- Upland GamebirdGame birds found in terrestrial habitats.Includes species such as ring-necked pheasant, quails, grouse, wild...
- Upland HabitatA broad category that includes agricultural land, forest/woodland, grassland and field/meadow.
- Upper ArkansasThe Arkansas River Basin above Its intersect with the Colorado-Kansas state Line. Colorado, Kansas, New...
- Upper Bound1. A plausible upper limit to the true value of a quantity. This is usually not a true statistical confidence...
- Upper CanadianThe Canadian River Basin above its intersect with the New Mexico-Texas state line. Colorado, New Mexico. Area...
- Upper ChesapeakeThe Chesapeake Bay and its tributary drainage north of the Maryland-Virginia state line including the...
- Upper CimarronThe Cimarron River Basin from its headwaters to the river's most downstream intersect with the...
- Upper ColoradoThe Colorado River Basin above and including the Oak Creek Basin. New Mexico, Texas. Area = 16000 sq.mi.
- Upper Colorado RegionThe drainage of: (a) the Colorado River Basin above the Lee Ferry compact point which is one mile below the...
- Upper Colorado-Dirty DevilThe Colorado River Basin below the confluence with the Green River Basin to the Lee Ferry compact point, but...
- Upper Colorado-DoloresThe Colorado River Basin from and including the Bitter Creek Basin to the confluence with the Green River...
- Upper ColumbiaThe Columbia River Basin within the the United States above the confluence with the Snake River Basin...
- Upper Detection LimitThe largest concentration that an instrument can reliably detect.
- Upper ExtremityThe region of the body that includes the arm, the forearm, and hand.
- Upper Gastrointestinal TractThe upper gastrointestinal (GI) tract is comprised of mouth, pharynx, esophagus and stomach while the lower...
- Upper GilaThe Gila River Basin above Coolidge Dam, including the Animas Valley closed basin. Arizona, New Mexico. Area...
- Upper HudsonThe Hudson River Basin to and including the Popolopen Brook Basin just upstream from Bear Mountain Bridge...
- Upper IllinoisThe Illinois River Basin above the confluence of and including the Fox River Basin. Illinois, Indiana...
- Upper Mississippi RegionThe drainage of the Mississippi River Basin above the confluence with the Ohio River, excluding the Missouri...
- Upper Mississippi-Black-RootThe Mississippi River Basin below the confluence with the St. Croix River Basin to and including the Root...
- Upper Mississippi-Iowa-Skunk-WapsipiniconThe Mississippi River Basin below Lock and Dam 13 to the confluence with the Des Moines River Basin...
- Upper Mississippi-Kaskaskia-MeramecThe Mississippi River Basin below the confluence with and excluding the Missouri River Basin to the...
- Upper Mississippi-Maquoketa-PlumThe Mississippi River Basin below the Root River Basin west of the Mississippi River and the La Crosse River...
- Upper Mississippi-SaltThe Mississippi River Basin below the confluence with the Des Moines River Basin to the confluence with the...
- Upper OhioThe Ohio River Basin below the confluence of the Allegheny and Monongahela River Basins to the confluence...
- Upper PecosThe Pecos River Basin to but excluding the Delaware River Basin. New Mexico, Texas. Area = 23500 sq.mi.
- Upper percentile1. Values in the upper tail (i.e., between 90th and 99.9th percentile) of the distribution of values for a...
- Upper Respiratory TractStructures that conduct air into the lungs, including the nasal cavity, mouth, pharynx, and larynx.
- Upper SnakeThe Snake River Basin to and including the Clover Creek Basin. Idaho, Nevada, Utah, Wyoming. Area = 35600...
- Upper SteamPortion of assist steam introduced via nozzles located on the exterior perimeter of the upper end of theflare...
- Upper TennesseeThe Tennessee River Basin above Watts Bar Dam. Georgia, North Carolina, Tennessee, Virginia. Area = 17200...
- Upper Water ColumnThe area from just below the surface to the boundary of the pycnocline, if present. (If a pycnocline is not...
- Upper WhiteThe White River Basin above and including the Little Red River Basin to the point of highest backwater effect...
- Upper YellowstoneThe Yellowstone River Basin above the confluence with the Bighorn River Basin. Montana, Wyoming. Area = 14400...
- Upper-Bound EstimateEstimate not likely to be lower than the true risk.
- Upper-Bound Lifetime Cancer RiskA likely upper limit to the true probability that a person will contract cancer over a 70-year lifetime due...
- Uppermost Aquifer1. The geologic formation nearest the natural ground surface that is an aquifer, as well as lower aquifers...
- Upper-Tail ProbabilityProbability that a variable exceeds a specified value.
- Uprated Generation Capacityincrease in available electric generating unit power capacity due to a system or equipment modification.
- Upset1. An exceptional incident in which there is unintentional and temporary noncompliance with the permit limit...
- Upstream EmissionEmissions that occur at life-cycle stages prior to use: e.g., raw materials acquisition, manufacturing, and...
- Upstream EmissionsEmissions that occur at life-cycle stages prior to use: e.g., raw materials acquisition, manufacturing, and...
- Upstream EventContamination event upstream from a drinking water intake
- Upstream WatershedIn How’s My Waterway the upstream watershed shows the entire land area that drains into the smaller selected...
- Uptake1. A process by which materials are transferred into or onto an organism.
- UptimeRatio of the total time during which the abatement system is in an operational mode with fluorinated GHGs or...
- upwelling1. The upward movement of an air mass in the atmosphere.
- Upwelling Longwave IrradianceThe rate at which radiant energy, at a wavelength longer than approximately 4 µm, is being emitted upwards...
- Upwelling Shortwave RadianceThe rate at which radiant energy, at a wavelength between 0.4 and 4 µm, is being emitted upwards into a...
- UracilA chemical compound that is used to make one of the building blocks of RNA. It is a type of pyrimidine.
- Uranium1. A heavy, naturally radioactive, metallic element that is used to produce nuclear power.
- Uranium Byproduct Material1. Waste produced by the extraction or concentration of uranium from any ore processed primarily for its...
- Uranium ConversionThe next step in the nuclear fuel cycle is to convert yellowcake into uranium hexafluoride (UF6) gas at a...
- Uranium EnrichmentAfter conversion, the UF6 gas is sent to an enrichment plant where the individual uranium isotopes are...
- Uranium ExplorationExploration for uranium and the development of mines to extract uranium ore. A variety of techniques are used...
- Uranium Fuel CycleOperations of milling of uranium ore, chemical conversion of uranium, isotopic enrichment of uranium...
- Uranium Mill Tailing Radiation Control ActTo authorize the Secretary of Energy to enter into cooperative agreements with certain States respecting...
- Uranium Mill Tailings PilesFormer uranium ore processing sites that contain leftover radioactive materials (wastes), including radium...
- Uranium milling1. The process that removes uranium from the ore. The ore is crushed and ground up, treated with chemical...
- Uranium Mill-Tailings Waste PilesLicensed active mills with tailings piles and evaporation ponds created by acid or alkaline leaching...
- Uranium MinerPerson hired to remove deposits of uranium ore from the earth.
- Uranium MiningWhen ore deposits that are economically feasible to recover are located, the next step in the fuel cycle is...
- Uranium OreRock containing uranium mineralization in concentrations that can be mined economically, typically one to...
- Uranium PoisoningResulting from mining of radioactive heavy metal uranium, Uranium Ore Dust presents chemical and radiological...
- Uranium Recovery FacilityFacility licensed by the NRC or an NRC Agreement State to manage uranium byproduct material or tailings...
- Uranium-235A naturally-occurring isotope of uranium. U-235 can be concentrated in a process called “enrichment,” making...
- Uranium-238The most abundant naturally-occurring uranium isotope.
- Urban1. High population density, >390 people per square kilometer [Original source: Humbert et. al, 2011, pg...
- Urban Area1. Collective term referring to all areas that are urban; including urbanized areas and urban clusters.
- Urban Bus1. Meaning set forth in §86.091-2 of this chapter.
- Urban Cluster1. A densely settled territory that has at least 2,500 people but fewer than 50,000. New for Census 2000.
- Urban CountyDef 1: A county is considered "urban" if it either includes a metropolitan statistical area with a population...
- Urban Dynamometer Driving ScheduleThe 1372 second transient speed driving sequence used by EPA to simulate typical urban driving. The UDDS for...
- Urban Fabric AnalysisAn Urban Fabric Analysis is a method for determining the proportions of vegetative, roofed, and paved surface...
- Urban forest1. The system of trees and associated plants that grow in small groups or under forest conditions on public...
- urban forest canopyThe land surface area that lies directly beneath the crowns of all trees and tall shrubs.
- Urban Heat IslandThe increased air temperatures in urban areas as contrasted to the cooler surrounding rural areas. [NOAA...
- Urban Heat Island EffectThe urban heat island effect is a measurable increase in ambient urban air temperatures resulting primarily...
- Urban LandscapeAn expanse of natural scenery seen by the eye in one view (Webster 1963) in an urbanized setting
- Urban or Built Up Land by Use1. A Land Cover/Use category consisting of residential, industrial, commercial, and institutional land...
- Urban PopulationAll territory, population and housing units in urbanized areas and in places of more than 2,500 persons...
- Urban Runoff1. The portion of precipitation, snowmelt, or irrigation water that does not naturally percolate into the...
- Urban School ChildrenChildren living in cities, including metropolitan and suburban areas.
- Urban Services RegionLand where city utilities such as water and sewer and public services such as police and fire protection are...
- Urban SoilUrban soils are found in watersheds that provide drinking water, food, waste utilization, and natural...
- Urban Sprawl1. The unplanned, uncontrolled spreading of urban development into areas adjoining the edge of a city.
- Urban Stormwater (Medium/Large MS4)Additional requirements for medium/large municipal separate storm sewer systems (MS4s), as defined at 40 CFR...
- Urban Stormwater Runoff1. Storm water from city streets and adjacent domestic or commercial properties that carries pollutants of...
- Urban Stormwater (Small MS4)Additional requirements for small municipal separate storm sewer systems (MS4s), as defined as 40 CFR...
- Urban Stream Surface WaterWater in a surface stream draining an urbanized land area. The surface urban stream is characterized by...
- Urban WoodTree trimmings, stumps, and related forest-derived biomass from urban settings.
- Urban-1 CountyCounty that contains a part of a Metropolitan Statistical Area with a population greater than 250,000, based...
- Urbanization1. The process by which an area of land becomes more urban in character, developed and otherwise changed to...
- Urbanized Area1. An area consisting of a central place(s) and adjacent territory with a general population density of at...
- Urbanized Areas1. Urbanized Areas are derived from the 2019 U.S. Census Bureau TIGER/Line Urban Areas. Urbanized Areas are...
- Urea1. A form of nitrogen that converts readily to ammonium.
- Urea CycleThe sequence of reactions by which arginine is synthesized from ornithine, then cleaved to yield urea and...
- Urea-Formaldehyde Content in Binder FormulationMass-based percent of urea-formaldehyde resin in the total binder mix as it is applied to the glass fibers to...
- Urea-Formaldehyde Foam InsulationA material once used to conserve energy by sealing crawl spaces, attics, etc.; no longer used because...
- Ureter1. The thick-walled tube that carries urine from each kidney to the bladder.
- Urethra1. A tube that transports urine from the urinary bladder to the outside of the body in both the sexes. It...
- Uric Acid Synthesis InhibitionUric Acid Synthesis Inhibition involves interference with, or restraint of, the formation of the...
- Urinary Bladder1. The distensible sac-like organ that functions as a reservoir of urine, collecting from the kidneys and...
- Urinary System1. The organs involved in the creation and excretion of urine.
- Urine FormationFormation of the liquid by-product of excretion produced in the kidneys, temporarily stored in the bladder...
- Urogenital System1. The body system that includes all organs involved in reproduction and in the formation and voidance of...
- Uropygial GlandGland at the base of a bird's tail to supply preening oil
- Urparian AreaUrparian describes the vegetated areas around roads and sidewalks. The term comes from combining urban and...
- UrticariaA vascular reaction of the skin marked by the transient appearance of smooth, slightly elevated patches...
- U.S. Customs and Border ProtectionCustoms and Border Protection is part of the U.S. Department of Homeland Security that is responsible for...
- U.S. Department, Agency and InstrumentalityAny executive department, military department, or independent establishment within the meaning of 5 U.S.C...
- U.S. Engine ProductionPhase 2 engines produced for purposes of being used in the United States, and includes any engine exported...
- U.S. Food and Drug Administrationwhich is involved in regulation of pesticides in the U.S., particularly enforcement of tolerances in food and...
- U.S. Heavy-Duty Vehicle SalesSales of heavy-duty vehicles subject to the standards of this subpart, where the sale takes place in any...
- U.S. Vehicle SalesUnless otherwise specified, sales in any state or territory of the United States except for California or the...
- U.S. WatersU.S. navigable waters and the U.S. EEZ.
- US06 CycleTest cycle, described in §86.159-00 and listed in appendix I, paragraph (g), of this part, which is designed...
- US06 Driving ScheduleTest procedure as described in 40 CFR 1066.801(c)(2).
- Usable Fuel Storage CapacityAmount of fuel that is available to a vehicle starting from a complete refueling event until the vehicle...
- Usage DirectionsText or graphics on the consumer product's label or accompanying literature that describes to the end user...
- USDAU.S. Department of Agriculture
- USDA Plant Hardiness ZoneZones based on the average annual minimum winter temperature, divided into 10-degree F zones.
- USDA Plant Hardiness Zone 10aAnnual average extreme minimum temperature 1976-2005 was 30 to 35 F
- USDA Plant Hardiness Zone 10bAnnual average extreme minimum temperature 1976-2005 was 35 to 40 F
- USDA Plant Hardiness Zone 11aAnnual average extreme minimum temperature 1976-2005 was 40 to 45 F
- USDA Plant Hardiness Zone 11bAnnual average extreme minimum temperature 1976-2005 was 45 to 50 F
- USDA Plant Hardiness Zone 12aAnnual average extreme minimum temperature 1976-2005 was 50 to 55 F
- USDA Plant Hardiness Zone 12bAnnual average extreme minimum temperature 1976-2005 was 55 to 60 F
- USDA Plant Hardiness Zone 13aAnnual average extreme minimum temperature 1976-2005 was 60 to 65 F
- USDA Plant Hardiness Zone 1aAnnual average extreme minimum temperature 1976-2005 was -60 to -55 F
- USDA Plant Hardiness Zone 1bAnnual average extreme minimum temperature 1976-2005 was -55 to -50 F
- USDA Plant Hardiness Zone 2aAnnual average extreme minimum temperature 1976-2005 was -50 to -45 F
- USDA Plant Hardiness Zone 2bAnnual average extreme minimum temperature 1976-2005 was -45 to -40 F
- USDA Plant Hardiness Zone 3aAnnual average extreme minimum temperature 1976-2005 was -40 to -35 F
- USDA Plant Hardiness Zone 3bAnnual average extreme minimum temperature 1976-2005 was -35 to -30 F
- USDA Plant Hardiness Zone 4aAnnual average extreme minimum temperature 1976-2005 was -30 to -25 F
- USDA Plant Hardiness Zone 4bAnnual average extreme minimum temperature 1976-2005 was -25 to -20 F
- USDA Plant Hardiness Zone 5aAnnual average extreme minimum temperature 1976-2005 was -20 to -15 F
- USDA Plant Hardiness Zone 5bAnnual average extreme minimum temperature 1976-2005 was -15 to -20 F
- USDA Plant Hardiness Zone 6aAnnual average extreme minimum temperature 1976-2005 was -10 to -5 F
- USDA Plant Hardiness Zone 6bAnnual average extreme minimum temperature 1976-2005 was -5 to 0 F
- USDA Plant Hardiness Zone 7aAnnual average extreme minimum temperature 1976-2005 was 0 to 5 F
- USDA Plant Hardiness Zone 7bAnnual average extreme minimum temperature 1976-2005 was 5 to 10 F
- USDA Plant Hardiness Zone 8aAnnual average extreme minimum temperature 1976-2005 was 10 to 15 F
- USDA Plant Hardiness Zone 8bAnnual average extreme minimum temperature 1976-2005 was 15 to 20 F
- USDA Plant Hardiness Zone 9aAnnual average extreme minimum temperature 1976-2005 was 20 to 25 F
- USDA Plant Hardiness Zone 9bAnnual average extreme minimum temperature 1976-2005 was 25 to 30 F
- U.S.-Directed Production Volume1. Amount of portable fuel containers, subject to the requirements of this subpart, produced by a...
- Use Attainability Analysis1. A structured scientific assessment of the factors affecting the attainment of the use which may include...
- Use Class NameThe Use Class assigned to an Assessment Unit.
- Use ClusterA set of competing chemicals, processes, and/or technologies that can substitute for one another in...
- Use Constituting Disposal1. The direct placement of recycled materials, that is wastes or waste derived-products, on the land. Note...
- USE COPIESDuplicates of a magnetic master or of original film that are prepared for use as reference copies or as...
- Use Cost EquationsThis control strategy attribute indicates whether cost equations should be used to compute the cost of...
- Use Group1. A use group is an EPA grouping of a specific state reported designated use. Examples of use groups...
- Use IR CategoryThe EPA Integrated Report Category for the Assessment Unit ID / Use combination, calculated by ATTAINS.
- Use NameName of the designated Use.
- Use RestrictionA general term that includes both use conditions and narrowed use limits.
- Use State IR CategoryLabel of Organization-specific Integrated Reporting categories for the Assessment Unit / Use combination as...
- Use SupportThe decision as to whether the Use Name (designated use) is Fully Supporting, Not Supporting, Insufficient...
- use value1. The value of a good or service derived from its direct or indirect use.
- Use valuesThe value received by individuals from goods or services, which is derived from direct contact with, use of...
- Used Broken Cathode Ray TubeCRT whose glass removed from its housing or casing whose vacuum has been released.
- Used Controlled SubstanceControlled substances that have been recovered from their intended use systems (may include controlled...
- Used Controlled Substance Individual ShipmentKilograms of a used controlled substance for which a person may make one (1) U.S. Customs entry as, as...
- Used Controlled SubstancesA used Class I or Class II compound that has been either recovered from its intended use systems (e.g...
- Used Intact Cathode Ray TubeCRT whose vacuum has not been released.
- Used Oil1. Spent motor oil from passenger cars and trucks collected at specified locations for recycling (not...
- Used Oil Aggregation PointAny site or facility that accepts, aggregates, and/or stores used oil collected only from other used oil...
- Used Oil BurnerFacility where used oil not meeting the specification requirements in § 279.11 is burned for energy recovery...
- Used Oil Collection CenterAny site or facility that is registered/licensed/permitted/recognized by a state/county/municipal government...
- Used Oil Filter RecyclingCrushing and draining of used oil filters of entrained oil and/or shredding and separation of used oil...
- Used Oil Fuel MarketerAny person who conducts either of the following activities:(1) Directs a shipment of off-specification used...
- Used Oil GeneratorAny person, by site, whose act or process produces used oil or whose act first causes used oil to become...
- Used Oil ProcessorFacility that processes used oil.
- Used Oil Re-RefinerFacility that processes used oil.
- Used Oil Transfer FacilityAny transportation related facility including loading docks, parking areas, storage areas and other areas...
- Used Oil TransporterAny person who transports used oil, any person who collects used oil from more than one generator and...
- Used or Reused MaterialIs “used or reused” if it is either:(i) Employed as an ingredient (including use as an intermediate) in an...
- Used Regulated SubstancesRegulated substances that have been recovered from their intended use systems (including regulated substances...
- Used SolventMixture of aliphatic hydrocarbons or a mixture of one and two ring aromatic hydrocarbons that has been used...
- Used TirePassenger car and light- and heavy-duty truck tires. Excludes high-speed industrial tires (from airplanes)...
- Use-Dependent PropertySoil properties that show change and respond to use and management of the soil, such as soil organic matter...
- Useful LifeThe period of time during which an emission standard applies to vehicles or engines. For light-duty vehicles...
- Useful Power1. With regard to a cogeneration unit, electricity or mechanical energy made available for use, excluding any...
- Useful Thermal Energy1. With regard to a cogeneration unit, thermal energy that is:(1) Made available to an industrial or...
- Useful Thermal Output1. Thermal energy made available for use in any heating application (e.g., steam delivered to an industrial...
- Use-Inherent PropertySoil properties that show little change over time and are not affected by use and management of the soil...
- User1. An organization, group, or individual that utilizes the results or products from environmental programs or...
- User ChargeCharge levied on users of a treatment works, or that portion of the ad valorem taxes paid by a user, for the...
- User Fee1. A fee which is collected only from those persons who use a particular service, as opposed to one collected...
- User Fee CollectionUser Fee Collection involves the collection of fees assessed on individuals or organizations for the...
- User Friendly Solar OvenA highly safe, reliable, and low-cost solar cooking and heating device that can effectively boil, bake, and...
- User GuideIn electronic records, a package of descriptive and technical documentation prepared for use with a data...
- User Multi-purpose KeyThis free text is not present if End Date is not null.
- Use-Specific InstructionInformation and requirements specific to a particular pesticide product or work site that an applicator needs...
- U.S.-Flagged VesselVessel of U.S. registry or a vessel operated under the authority of the United States.
- USGS Field Lab CodeIndicates where the measurement was made (i.e., in the field or in the lab) as defined by the USGS.
- USGS Hydrologic UnitsHierarchical subdivision of land area of United States based on hydrology. "Provide a standardized base for...
- U.S.-Registered AircraftAircraft that is on the U.S. Registry.
- UST systems that are federally regulatedAccording to Section 9001 of RCRA's Subtitle I, federally regulated UST systems are defined as "any one or...
- UstilaginomycetesThe class that contains the fungi (called smut fungi) which cause plant smut diseases
- Usual dietary intakesRefers to the long-term average daily intake by an individual.
- Uterus1. A hollow, thick-walled, muscular organ located within the pelvic cavity of a woman. Within the uterus the...
- Utica ShaleThe Utica Shale is below the Marcellus Shale and has both natural gas and liquid hydrocarbons. It overlaps...
- UtilitiesThe Utilities sector comprises establishments engaged in the provision of the following utility services...
- Utility1. One of three main components of quality in EPA's Information Quality Guidelines. Utility refers to the...
- Utility Competitive Bid SolicitationPublic request from a regulated utility for offers to the utility for meeting future generating needs. A...
- Utility FlareThermal oxidation system using an open (without enclosure) flame. An enclosed combustor as defined in §§...
- Utility Infrastructure Pricing to Support Infill DevelopmentRevising utility pricing and cost recovery structures to reflect the true cost of energy delivery supports...
- Utility Interconnection1. The method of utilizing electricity produced from manure management facilities. Options include either (1)...
- Utility LoadThe total electricity demand for a utility district.
- Utility Power Distribution System1. Portion of an electricity grid owned or operated by a utility and dedicated to delivering electricity to...
- Utility ProjectA project that includes uses such as water and/or gas pipelines, or electricity transmission lines.
- Utility Regulatory AuthorityAuthority, board, commission, or other entity (limited to the local-, State-, or federal-level, whenever so...
- Utility SystemAll interconnected units and generators operated by the same utility operating company.
- Utility UnitUnit owned or operated by a utility:(1) That serves a generator in any State that produces electricity for...
- UV Light Cured CoatingsThese coatings use UV light to set the coating instead of solvents.
- UV MutagenesisThe process by which the genetic information of an organism is changed in a stable manner by the radiation in...
- UV RadiationLight having a wavelength greater than 10 nm but less than 400 nm.
- UV-ABand of ultraviolet radiation with wavelengths from 320-400 nanometers produced by the Sun. UVA is not...
- UVA1. A band of ultraviolet radiation with wavelengths from 320-400 nanometers produced by the Sun. UVA is not...
505 of 30,736 terms in Environment terminology (MLC-0121). Request the full dataset.