Environment terminology · MLC-0121

Environment terms: 0-9 (93)

• ">="This indicates that the limitation is greater than or equal to the value presented in the CFR.
• 10 Point Milk and Dairy Beef Residue Prevention ProtocolDesigned by veterinarians and milk producer organizations to avoid contamination of milk with antibiotics. It...
• 10 Year 24-Hour Rainfall Event1. Rainfall event with a probable recurrence interval of once in ten years as defined by the National Weather...
• 100-year 24-Hour Rainfall EventPrecipitation event with a probable recurrence interval of once in ten years, or twenty five years, or one...
• 100-year flood1. The standard used by the National Flood Insurance Program (NFIP) for floodplain management purposes and to...
• 100-Year Flood LevelsSevere flood levels with a one-in-100 likelihood of occurring in any given year.
• 10-Day Lethal Concentration 50 PercentApplied to the sediment toxicity BAT effluent limitations and NSPS means the concentration...
• 10-Day Rolling Average1. Arithmetic mean of all valid hours of data from 10 successive operating days, except for periods of...
• 10-Year 24-Hour Precipitation EventMaximum 24-hour precipitation event with a probable reoccurrence interval of once in 10 years. This...
• 10-year, 24-hour stormA rainfall event of 24-hour duration and 10-year frequency that is used to calculate the runoff volume and...
• 1,1 Dichloroethylene or 1,1 DichloroethenePlease see the ATSDR fact sheet for 1,1 Dichloroethylene or 1,1 Dichloroethene.
• 1,1,1-Trichloro-2,2-bis(p-chlorophenyl)ethane1. The first chlorinated hydrocarbon insecticide has a half-life of 15 years and can collect in fatty tissues...
• 1,1,1-TrichloroethanePlease see the ATSDR fact sheet for 1,1,1-TCA.
• 1,1,2,2-Tetrachloroethane1,1,2,2-Tetrachloroethane is a manufactured, colorless, dense liquid that does not burn easily. It is...
• 11-Aminodecanoic AcidChemical substance, CAS Number 2432-99-7.(2)
• 1,1-Dichloro-2,2-bis(p-chlorophenyl)ethyleneDDT metabolite
• 1,1-DichloroethanePlease see the ATSDR fact sheet for 1,1-DCA.
• 11(e)(2) byproduct materialA legal definition from the Atomic Energy Act. The tailings or wastes produced by the extraction or...
• 1,2,3,4,7,7-HexachloronorbornadieneThe chemical substance 1,2,3,4,7,7-hexachloronorbornadiene, CAS Number 3389-71-7.
• 12-Month Rolling AverageArithmetic mean of the previous 12 months of valid fuel analysis data. The 12 months should be consecutive...
• 13 CFRBusiness Credit and Assistance
• 16S rRNA GenePart of the ribosomal RNA genes that microbiologists use for the phylogenetic identification of bacteria. Due...
• 17-Ethinyl EstradiolEthinyl estradiol is a semisynthetic alkylated estradiol with a 17-alpha-ethinyl substitution. It has high...
• 18 CFRConservation of Power and Water Resources
• 19 CFRCustoms Duties
• #1DDistillate fuel classification relating to ‘‘No. 1-D’’ diesel fuels as described in ASTM D 975-04. The...
• 1-Hour National Ambient Air Quality Standard Maintenance AreaArea that was designated nonattainment for the 1-hour NAAQS on or after November 15, 1990 and was...
• 1-Hour Ozone Design Value1-hour ozone concentration calculated according to 40 CFR part 50, Appendix H and the interpretation...
• 1st Cleanup Action InitiatedThe first physical cleanup action underway at a site, consisting of either a removal or remedial activity.
• 1-year, 24-hour Precipitation EventMaximum 24-hour precipitation event with a probable recurrence interval of once in one year as defined by the...
• 1-Year, 2-Year, and 10-Year, 24-Hour Precipitation EventsMaximum 24-hour precipitation event with a probable recurrence interval of once in one, two, and ten years...
• 2008 Ozone NAAQS2008 8-hour primary and secondary ozone NAAQS codified at 40 CFR 50.15.
• 2,2',4,4'-Tetrabromodiphenyl EtherA brominated diphenyl ether with the CAS Registry Number 5436-43-1
• 2,3,7,8-HDDAny of the dibenzo-p-dioxins totally chlorinated or totally brominated at the following positions on the...
• 2,3,7,8-HDFAny of the dibenzofurans totally chlorinated or totally brominated at the following positions on the...
• 2,3,7,8-Tetrachlorodibenzo-p-Dioxin2,3,7,8-Tetrachlorodibenzo-p-dioxin which is often referred to simply as dioxin and is the reference for a...
• 2,3,7,8-Tetrachlorodibenzo-p-dioxin Toxic Equivalency QuotientA procedure that expresses the toxicity of PCDD, PCDF, and PCB in terms of the most toxic dioxin, as...
• 23S rRNA GenePart of the ribosomal RNA genes that microbiologists use for the phylogenetic identification of bacteria. Due...
• 24-Hour Daily Average1. Either the arithmetic mean or geometric mean (as specified) of all hourly emission concentrations when the...
• 25-year 24-Hour Rainfall Event1. Maximum precipitation event with a probable recurrence interval of once in 25 years as defined by the...
• 25-year, 24-hour stormA rainfall event of 24-hour duration and 25-year frequency that is used to calculate the runoff volume and...
• 2-ButoxyethanolA clear colorless liquid that smells somewhat like ether. It is usually produced by a reaction of ethylene...
• #2DDistillate fuel classification relating to ‘‘No. 2-D’’ diesel fuels as described in ASTM D 975-04.
• 2-MethoxyethanolMolecular Formula is C3H8O2 and the Chemical Structure is CH3OCH2CH2OH. 2-Methoxyethanol is used primarily as...
• 2-year, 24-hour Precipitation EventMaximum 24-hour precipitation event with a probable recurrence interval of once in two years as defined by...
• 300 Series Stainless SteelAny stainless steel alloy with a Unified Numbering System for Metals and Alloys number designated from S30100...
• 303(d)Refers to section 303(d) of the Clean Water Act, which requires states, territories, and authorized tribes to...
• 303(d) and 305(b) Integrated ReportEPA recommended approach to integrating water quality conditions data submitted by states under Clean Water...
• 303(D) List1. A list of streams, lakes, and estuaries where state water-quality standards are not met or where...
• 303(d) Listed Impaired Waters1. A CWA Section 303(d) listed impaired water is a waterbody that is impaired or threatened and needs a TMDL...
• 303(d) Threatened and Impaired Waters ListUnder Section 303(d) of the Clean Water Act (CWA) or Act, states, territories, and authorized tribes are...
• 305(b)Refers to section 305 subsection (b) of the Clean Water Act. 305(b) generally describes a report of each...
• 30-Day AverageArithmetic mean of pollutant parameter values of samples collected in a period of 30 consecutive days.
• 30-Day Rolling Average1. Arithmetic mean of all valid hours of data from 30 successive operating days, except for periods of...
• 319 Nonpoint Source ProjectNonpoint source pollution reduction project funded under the Clean Water Act Section 319 Nonpoint Source...
• 319 Project IDClean Water Act Section 319 Nonpoint Source Management Program grant project identification number.
• 33 CFRNavigation and Navigable Waters
• 36 CFRParks, Forests, and Public Property
• 3-Bag Federal Test ProcedureFederal Test Procedure specified in part 86 of this chapter, with three sampling portions consisting of the...
• 3-Day, 24-Hour Rolling AverageDaily calculations of the average 24-hour emission rate (lbs/ton of feed/charge), over the 3 most recent...
• 3-Hour Rolling AverageArithmetic mean of the previous thirty-six 5-minute periods of valid operating data collected, as specified...
• 40 CFRProtection of Environment
• 401(a) CertificationA requirement of CWA section 401(a) that all federally issued permits be certified by the state in which the...
• 40-hexThe landscape description hexagon that is established on each of the grid points in the EMAP grid. Actual...
• 43 CFRPublic Lands: Interior
• 4,4'-Methylenebis(2-chloroaniline)(CAS No. 101-14-4) is subject to reporting under this section. The substance also is identified as...
• 48 CFRFederal Acquisition Regulations System
• 4-AminobutyrateAn amino acid which acts as a neurotransmitter in some organisms. [ISBN:0198506732]
• 4B Restoration ApproachA method for achieving water quality standards for water quality impaired segments through controls developed...
• 4-Bag Federal Test Procedure3-bag FTP, with the addition of a sampling portion for the hot-start stabilized phase (“Bag 4”).
• 4-day averageHighest allowable average of daily discharge values for four consecutive monitoring days, calculated as the...
• 4-Day Lethal Concentration 50 PercentApplied to the sediment toxicity BAT effluent limitations and NSPS means the concentration...
• 4-Hour Block Average Emission Rate1. Average of all hourly emission rates when the affected facility is operating and combusting MSW measured...
• 4-HydroxynonenalCytotoxic product from peroxidation of liver microsomal lipids.
• 4-MethylcyclohexanemethanolA clear, colorless liquid, which is reported to smell like licorice. It is used in a coal industry in the...
• 5 CFRAdministrative Personnel
• 50 CFRWildlife and Fisheries
• 50% WaiverAn applicant that meets the definition of a small business is eligible for a fifty percent (50%) waiver of...
• 500 ppm LM Diesel FuelDiesel fuel subject to the alternative sulfur standards in § 1090.320 that is produced by a transmix...
• 505 CycleTest cycle that consists of the first 505 seconds (seconds 1 to 505) of the EPA Urban Dynamometer Driving...
• 50-State Engine FamilyEngine family that meets both federal and California Air Resources Board motor vehicle emission control...
• 5-Cycle Federal Test ProcedureFTP, HFET, US06, SC03 and cold temperature FTP tests as described in subparts B and C of this part.
• 5-Year, 6-Hour Precipitation EventMaximum 6-hour precipitation event with a probable recurrence interval of once in 5 years as established by...
• 7,12-DimethylbenzanthracenePolycyclic aromatic hydrocarbon found in tobacco smoke that is a potent carcinogen.
• 75% WaiverAn applicant that meets the definition of a small business, a corporation, partnership or un-incorporated...
• 7520 FormsThe 7520 ("Seventy-five twenty") forms have been generated by U.S. Environmental Protection Agency...
• 7-Day Average Pollutant ValueArithmetic mean of pollutant parameter values for samples collected in a period of 7 consecutive days.
• 7Q10Seven-day, consecutive low flow with a ten year return frequency; the lowest stream flow for seven...
• 866 CycleTest cycle that consists of the last 866 seconds (seconds 505 to 1372) of the EPA Urban Dynamometer Driving...
• 8-Hour Block AverageAverage of all hourly emission concentrations or parameter levels when the municipal waste combustion unit...
• 8-Hour National Ambient Air Quality StandardAir quality standards under the Clean Air Act (42 U.S.C. 7401 et seq.) codified at 40 CFR 50.10.
• 8-Hour Ozone Design Value8-hour ozone concentration calculated according to 40 CFR part 50, appendix I.
• 96-Hour Lethal Concentration 50 PercentConcentration (parts per million) or percent of the suspended particulate phase (SPP) from a sample that is...

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