Abbreviations & Acronyms: R-Z
Note: Some acronyms have more than one meaning. Multiple meanings are listed, separated by semi-colons.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
RA: Reasonable Alternative; Regulatory Alternatives; Regulatory Analysis; Remedial Action; Resource Allocation; Risk Analysis; Risk Assessment
RAATS: RCRA Administrate Action Tracking System
RAC: Radiation Advisory Committee. Raw Agricultural Commodity; Regional Asbestos Coordinator. Response Action Coordinator
RACM: Reasonably Available Control Measures
RACT: Reasonably Available Control Technology
RAD: Radiation Adsorbed Dose (unit of measurement of radiation absorbed by humans)
RADM: Random Walk Advection and Dispersion Model; Regional Acid Deposition Model
RAM: Urban Air Quality Model for Point and Area Source in EPA UNAMAP Series
RAMP: Rural Abandoned Mine Program
RAMS: Regional Air Monitoring System
RAP: Radon Action Program; Registration Assessment Panel; Remedial Accomplishment Plan; Response Action Plan
RAPS: Regional Air Pollution Study
RARG: Regulatory Analysis Review Group
RAS: Routine Analytical Service
RAT: Relative Accuracy Test
RB: Request for Bid
RBAC: Re-use Business Assistance Center
RBC: Red Blood Cell
RC: Responsibility Center
RCC: Radiation Coordinating Council
RCDO: Regional Case Development Officer
RCO: Regional Compliance Officer
RCP: Research Centers Program
RCRA: Resource Conservation and Recovery Act
RCRIS: Resource Conservation and Recovery Information System
RD/RA: Remedial Design/ Remedial Action
R&D: Research and Development
RD&D: Research, Development and Demonstration
RDF: Refuse-Derived Fuel
RDNA: Recombinant DNA
RDU: Regional Decision Units
RDV: Reference Dose Values
RE: Reasonable Efforts; Reportable Event
REAP: Regional Enforcement Activities Plan
REE: Rare Earth Elements
REEP: Review of Environmental Effects of Pollutants
RECLAIM: Regional Clean Air Initiatives Marker
RED: Reregistration Eligibility Decision Document
REDA: Recycling Economic Development Advocate
ReFIT: Reinvention for Innovative Technologies
REI: Restricted Entry Interval
REM: (Roentgen Equivalent Man)
REM/FIT: Remedial/Field Investigation Team
REMS: RCRA Enforcement Management System
REP: Reasonable Efforts Program
REPS: Regional Emissions Projection System
RESOLVE: Center for Environmental Conflict Resolution
RF: Response Factor
RFA: Regulatory Flexibility Act
RFB: Request for Bid
RfC: Reference Concentration
RFD: Reference Dose Values
RFI: Remedial Field Investigation
RFP: Reasonable Further Programs. Request for Proposal
RHRS: Revised Hazard Ranking System
RI: Reconnaissance Inspection
RI: Remedial Investigation
RIA: Regulatory Impact Analysis; Regulatory Impact Assessment
RIC: Radon Information Center
RICC: Retirement Information and Counseling Center
RICO: Racketeer Influenced and Corrupt Organizations Act
RI/FS: Remedial Investigation/ Feasibility Study
RIM: Regulatory Interpretation Memorandum
RIN: Regulatory Identifier Number
RIP: RCRA Implementation Plan
RISC: Regulatory Information Service Center
RJE: Remote Job Entry
RLL: Rapid and Large Leakage (Rate)
RMCL: Recommended Maximum Contaminant Level (this phrase being discontinued in favor of MCLG)
RMDHS: Regional Model Data Handling System
RMIS: Resources Management Information System
RMP: Risk Management Plan
RNA: Ribonucleic Acid
ROADCHEM: Roadway Version that Includes Chemical Reactions of BI, NO2, and O3
ROADWAY: A Model to Predict Pollutant Concentrations Near a Roadway
ROC: Record Of Communication
RODS: Records Of Decision System
ROG: Reactive Organic Gases
ROLLBACK: A Proportional Reduction Model
ROM: Regional Oxidant Model
ROMCOE: Rocky Mountain Center on Environment
ROP: Rate of Progress; Regional Oversight Policy
ROPA: Record Of Procurement Action
ROSA: Regional Ozone Study Area
RP: Radon Progeny Integrated Sampling. Respirable Particulates. Responsible Party
RPAR: Rebuttable Presumption Against Registration
RPM: Reactive Plume Model. Remedial Project Manager
RQ: Reportable Quantities
RRC: Regional Response Center
RRT: Regional Response Team; Requisite Remedial Technology
RS: Registration Standard
RSCC: Regional Sample Control Center
RSD: Risk-Specific Dose
RSE: Removal Site Evaluation
RTCM: Reasonable Transportation Control Measure
RTDF: Remediation Technologies Development Forum
RTDM: Rough Terrain Diffusion Model
RTECS: Registry of Toxic Effects of Chemical Substances
RTM: Regional Transport Model
RTP: Research Triangle Park
RUP: Restricted Use Pesticide
RVP: Reid Vapor Pressure
RWC: Residential Wood Combustion
S&A: Sampling and Analysis. Surveillance and Analysis
SAB: Science Advisory Board
SAC: Suspended and Cancelled Pesticides
SAEWG: Standing Air Emissions Work Group
SAIC: Special-Agents-In-Charge
SAIP: Systems Acquisition and Implementation Program
SAMI: Southern Appalachian Mountains Initiative
SAMWG: Standing Air Monitoring Work Group
SANE: Sulfur and Nitrogen Emissions
SANSS: Structure and Nomenclature Search System
SAP: Scientific Advisory Panel
SAR: Start Action Request. Structural Activity Relationship (of a qualitative assessment)
SARA: Superfund Amendments and Reauthorization Act of 1986
SAROAD: Storage and Retrieval Of Aerometric Data
SAS: Special Analytical Service. Statistical Analysis System
SASS: Source Assessment Sampling System
SAV: Submerged Aquatic Vegetation
SBC: Single Breath Cannister
SC: Sierra Club
SCAP: Superfund Consolidated Accomplishments Plan
SCBA: Self-Contained Breathing Apparatus
SCC: Source Classification Code
SCD/SWDC: Soil or Soil and Water Conservation District
SCFM: Standard Cubic Feet Per Minute
SCLDF: Sierra Club Legal Defense Fund
SCR: Selective Catalytic Reduction
SCRAM: State Consolidated RCRA Authorization Manual
SCRC: Superfund Community Relations Coordinator
SCS: Supplementary Control Strategy/System
SCSA: Soil Conservation Society of America
SCSP: Storm and Combined Sewer Program
SCW: Supercritical Water Oxidation
SDC: Systems Decision Plan
SDWA: Safe Drinking Water Act
SDWIS: Safe Drinking Water Information System
SBS: Sick Building Syndrome
SEA: State Enforcement Agreement
SEA: State/EPA Agreement
SEAM: Surface, Environment, and Mining
SEAS: Strategic Environmental Assessment System
SEDS: State Energy Data System
SEGIP: State Environmental Goals and Improvement Project
SEIA: Socioeconomic Impact Analysis
SEM: Standard Error of the Means
SEP: Standard Evaluation Procedures
SEP: Supplementary Environmental Project
SEPWC: Senate Environment and Public Works Committee
SERC: State Emergency Planning Commission
SES: Secondary Emissions Standard
SETAC: Society for Environmental Toxicology and Chemistry
SETS: Site Enforcement Tracking System
SF: Standard Form. Superfund
SFA: Spectral Flame Analyzers
SFDS: Sanitary Facility Data System
SFFAS: Superfund Financial Assessment System
SFIP: Sector Facility Indexing Project
SFIREG: State FIFRA Issues Research and Evaluation Group
SFS: State Funding Study
SHORTZ: Short Term Terrain Model
SHWL: Seasonal High Water Level
SI: International System of Units. Site Inspection. Surveillance Index. Spark Ignition
SIC: Standard Industrial Classification
SICEA: Steel Industry Compliance Extension Act
SIMS: Secondary Ion-Mass Spectrometry
SIP: State Implementation Plan
SITE: Superfund Innovative Technology Evaluation
SLAMS: State/Local Air Monitoring Station
SLN: Special Local Need
SLSM: Simple Line Source Model
SMART: Simple Maintenance of ARTS
SMCL: Secondary Maximum Contaminant Level
SMCRA: Surface Mining Control and Reclamation Act
SME: Subject Matter Expert
SMO: Sample Management Office
SMOA: Superfund Memorandum of Agreement
SMP: State Management Plan
SMR: Standardized Mortality Ratio
SMSA: Standard Metropolitan Statistical Area
SNA: System Network Architecture
SNAAQS: Secondary National Ambient Air Quality Standards
SNAP: Significant New Alternatives Project; Significant Noncompliance Action Program
SNARL: Suggested No Adverse Response Level
SNC: Significant Noncompliers
SNUR: Significant New Use Rule
SO²: Sulfur Dioxide
SOC: Synthetic Organic Chemicals
SOCMI: Synthetic Organic Chemicals Manufacturing Industry
SOFC: Solid Oxide Fuel Cell
SOTDAT: Source Test Data
SOW: Scope Of Work
SPAR: Status of Permit Application Report
SPCC: Spill Prevention, Containment, and Countermeasure
SPE: Secondary Particulate Emissions
SPF: Structured Programming Facility
SPI: Strategic Planning Initiative
SPLMD: Soil-pore Liquid Monitoring Device
SPMS: Strategic Planning and Management System; Special Purpose Monitoring Stations
SPOC: Single Point Of Contact
SPS: State Permit System
SPSS: Statistical Package for the Social Sciences
SPUR: Software Package for Unique Reports
SQBE: Small Quantity Burner Exemption
SQG: Small Quantity Generator
SR: Special Review
SRAP: Superfund Remedial Accomplishment Plan
SRC: Solvent-Refined Coal
SRF: State Revolving Fund
SRM: Standard Reference Method
SRP: Special Review Procedure
SRR: Second Round Review. Submission Review Record
SRTS: Service Request Tracking System
SS: Settleable Solids. Superfund Surcharge. Suspended Solids
SSA: Sole Source Aquifer
SSAC: Soil Site Assimilated Capacity
SSC: State Superfund Contracts
SSD: Standards Support Document
SSEIS: Standard Support and Environmental Impact Statement;. Stationary Source Emissions and Inventory System.
SSI: Size Selective Inlet
SSMS: Spark Source Mass Spectrometry
SSO: Sanitary Sewer Overflow; Source Selection Official
SSRP: Source Reduction Review Project
SSTS: Section Seven Tracking System
SSURO: Stop Sale, Use and Removal Order
STALAPCO: State and Local Air-Pollution Control Officials
STAPPA: State and Territorial Air Pollution
STAR: Stability Wind Rose. State Acid Rain Projects
STARS: Strategic Targeted Activities for Results System
STEL: Short Term Exposure Limit
STEM: Scanning Transmission-Electron Microscope
STN: Scientific and Technical Information Network
STORET: Storage and Retrieval of Water-Related Data
STP: Sewage Treatment Plant. Standard Temperature and Pressure
STTF: Small Town Task Force (EPA)
SUP: Standard Unit of Processing
SURE: Sulfate Regional Experiment Program
SV: Sampling Visit; Significant Violater
SW: Slow Wave
SWAP: Source Water Assessment Program
SWARF: Waste from Metal Grinding Process
SWC: Settlement With Conditions
SWDA: Solid Waste Disposal Act
SWIE: Southern Waste Information Exchange
SWMU: Solid Waste Management Unit
SWPA: Source Water Protection Area
SWQPPP: Source Water Quality Protection Partnership Petitions
SWTR: Surface Water Treatment Rule
SYSOP: Systems Operator
TAD: Technical Assistance Document
TAG: Technical Assistance Grant
TALMS: Tunable Atomic Line Molecular Spectroscopy
TAMS: Toxic Air Monitoring System
TAMTAC: Toxic Air Monitoring System Advisory Committee
TAP: Technical Assistance Program
TAPDS: Toxic Air Pollutant Data System
TAS: Tolerance Assessment System
TBT: Tributyltin
TC: Target Concentration. Technical Center. Toxicity Characteristics. Toxic Concentration:
TCDD: Dioxin (Tetrachlorodibenzo-p-dioxin)
TCDF: Tetrachlorodi-benzofurans
TCE: Trichloroethylene
TCF: Total Chlorine Free
TCLP: Total Concentrate Leachate Procedure. Toxicity Characteristic Leachate Procedure
TCM: Transportation Control Measure
TCP: Transportation Control Plan; Trichloropropane;
TCRI: Toxic Chemical Release Inventory
TD: Toxic Dose
TDS: Total Dissolved Solids
TEAM: Total Exposure Assessment Model
TEC: Technical Evaluation Committee
TED: Turtle Excluder Devices
TEG: Tetraethylene Glycol
TEGD: Technical Enforcement Guidance Document
TEL: Tetraethyl Lead
TEM: Texas Episodic Model
TEP: Typical End-use Product. Technical Evaluation Panel
TERA: TSCA Environmental Release Application
TES: Technical Enforcement Support
TEXIN: Texas Intersection Air Quality Model
TGO: Total Gross Output
TGAI: Technical Grade of the Active Ingredient
TGP: Technical Grade Product
THC: Total Hydrocarbons
THM: Trihalomethane
TI: Temporary Intermittent
TI: Therapeutic Index
TIBL: Thermal Internal Boundary Layer
TIC: Technical Information Coordinator. Tentatively Identified Compounds
TIM: Technical Information Manager
TIP: Technical Information Package
TIP: Transportation Improvement Program
TIS: Tolerance Index System
TISE: Take It Somewhere Else
TITC: Toxic Substance Control Act Interagency Testing Committee
TLV: Threshold Limit Value
TLV-C: TLV-Ceiling
TLV-STEL: TLV-Short Term Exposure Limit
TLV-TWA: TLV-Time Weighted Average
TMDL: Total Maximum Daily Limit; Total Maximum Daily Load
TMRC: Theoretical Maximum Residue Contribution
TNCWS: Transient Non-Community Water System
TNT: Trinitrotoluene
TO: Task Order
TOA: Trace Organic Analysis
TOC: Total Organic Carbon/ Compound
TOX: Tetradichloroxylene
TP: Technical Product; Total Particulates
TPC: Testing Priorities Committee
TPI: Technical Proposal Instructions
TPQ: Threshold Planning Quantity
TPSIS: Transportation Planning Support Information System
TPTH: Triphenyltinhydroxide
TPY: Tons Per Year
TQM: Total Quality Management
T-R: Transformer-Rectifier
TRC: Technical Review Committee
TRD: Technical Review Document
TRI: Toxic Release Inventory
TRIP: Toxic Release Inventory Program
TRIS: Toxic Chemical Release Inventory System
TRLN: Triangle Research Library Network
TRO: Temporary Restraining Order
TSA: Technical Systems Audit
TSCA: Toxic Substances Control Act
TSCATS: TSCA Test Submissions Database
TSCC: Toxic Substances Coordinating Committee
TSD: Technical Support Document
TSDF: Treatment, Storage, and Disposal Facility
TSDG: Toxic Substances Dialogue Group
TSI: Thermal System Insulation
TSM: Transportation System Management
TSO: Time Sharing Option
TSP: Total Suspended Particulates
TSS: Total Suspended (non-filterable) Solids
TTFA: Target Transformation Factor Analysis
TTHM: Total Trihalomethane
TTN: Technology Transfer Network
TTO: Total Toxic Organics
TTY: Teletypewriter
TVA: Tennessee Valley Authority
TVOC: Total Volatile Organic Compounds
TWA: Time Weighted Average
TWS: Transient Water System
TZ: Treatment Zone
UAC: User Advisory Committee
UAM: Urban Airshed Model
UAO: Unilateral Administrative Order
UAPSP: Utility Acid Precipitation Study Program
UAQI: Uniform Air Quality Index
UARG: Utility Air Regulatory Group
UCC: Ultra Clean Coal
UCCI: Urea-Formaldehyde Foam Insulation
UCL: Upper Control Limit
UDMH: Unsymmetrical Dimethyl Hydrazine
UEL: Upper Explosive Limit
UF: Uncertainty Factor
UFL: Upper Flammability Limit
ug/m3: Micrograms Per Cubic Meter
UIC: Underground Injection Control
ULEV: Ultra Low Emission Vehicles
UMTRCA: Uranium Mill Tailings Radiation Control Act
UNAMAP: Users' Network for Applied Modeling of Air Pollution
UNECE: United Nations Economic Commission for Europe
UNEP: United Nations Environment Program
USC: Unified Soil Classification
USDA: United States Department of Agriculture
USDW: Underground Sources of Drinking Water
USFS: United States Forest Service
UST: Underground Storage Tank
UTM: Universal Transverse Mercator
UTP: Urban Transportation Planning
UV: Ultraviolet
UVA, UVB, UVC: Ultraviolet Radiation Bands
UZM: Unsaturated Zone Monitoring
VALLEY: Meteorological Model to Calculate Concentrations on Elevated Terrain
VCM: Vinyl Chloride Monomer
VCP: Voluntary Cleanup Program
VE: Visual Emissions
VEO: Visible Emission Observation
VHS: Vertical and Horizontal Spread Model
VHT: Vehicle-Hours of Travel
VISTTA: Visibility Impairment from Sulfur Transformation and Transport in the Atmosphere
VKT: Vehicle Kilometers Traveled
VMT: Vehicle Miles Traveled
VOC: Volatile Organic Compounds
VOS: Vehicle Operating Survey
VOST: Volatile Organic Sampling Train
VP: Vapor Pressure
VSD: Virtually Safe Dose
VSI: Visual Site Inspection
VSS: Volatile Suspended Solids
WA: Work Assignment
WADTF: Western Atmospheric Deposition Task Force
WAP: Waste Analysis Plan
WAVE: Water Alliances for Environmental Efficiency
WB: Wet Bulb
WCED: World Commission on Environment and Development
WDROP: Distribution Register of Organic Pollutants in Water
WENDB: Water Enforcement National Data Base
WERL: Water Engineering Research Laboratory
WET: Whole Effluent Toxicity test
WHO: World Health Organization
WHP: Wellhead Protection Program
WHPA: Wellhead Protection Area
WHWT: Water and Hazardous Waste Team
WICEM: World Industry Conference on Environmental Management
WL: Warning Letter; Working Level (radon measurement)
WLA/TMDL: Wasteload Allocation/Total Maximum Daily Load
WLM: Working Level Months
WMO: World Meteorological Organization
WP: Wettable Powder
WPCF: Water Pollution Control Federation
WQS: Water Quality Standard
WRC: Water Resources Council
WRDA: Water Resources Development Act
WRI: World Resources Institute
WS: Work Status
WSF: Water Soluble Fraction
WSRA: Wild and Scenic Rivers Act
WSTB: Water Sciences and Technology Board
WSTP: Wastewater Sewage Treatment Plant
WWEMA: Waste and Wastewater Equipment Manufacturers Association
WWF: World Wildlife Fund
WWTP: Wastewater Treatment Plant
WWTU: Wastewater Treatment Unit
ZEV: Zero Emissions Vehicle
ZHE: Zero Headspace Extractor
ZOI: Zone Of Incorporation
ZRL: Zero Risk Level