TWA concentration definition

TWA concentration means the time weighted average concentration of an atmospheric contaminant when calculated over a normal 8 hour working period during a 5 day working week;
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Examples of TWA concentration in a sentence

  • Employees are not required to wear respirators if monitoring information collected and analyzed in accordance with paragraph (e)(3) of this section demonstrates that the ambient 8-hour TWA concentration of the new chem- ical substance in the area is less than 1 ppm for gases and vapors and 5 μg/m3 for particulates with an allowable TWA excursion of 50 percent above these concentrations for a duration of 30 minutes or less.(iii) Quantitative fit test.

  • Thus, the PELs are the maximum permitted 8-hour TWA concentration of an airborne contaminant without the use of respiratory protection.

  • Ecotoxicology; aquatic.This may include argumentation that a time-weighted average (TWA) concentration is relevant for risk assessment.

  • Consequently, a single, brief sample that is applicable to an OEL-C is not appropriate to the OEL-TWA; here a sufficient number of samples are needed to permit determination of a TWA concentration throughout a complete cycle of operation or throughout the work shift.

  • EXPOSURE LIMITS:Unless specified otherwise, limits are expressed as a time-weighted average (TWA) concentration for an 8-hour work shift of a04-hour workweek.

  • The Action Level for airborne lead exposure is 30 μg/m3, as an 8-hour time weighted average (TWA) concentration, without regard to the use of respirators.

  • The intent of the guidelines is to manage fatigue and provide flexibility for IC’s and Line Officers managing initial attack, extended attack, and large fires.

  • Al- though routine pulmonary function testing is only required by the standard once every year for persons who are exposed over the TWA concentration limit, these tests have an obvious value in investigating possible respiratory dysfunction and should be used wherever deemed appropriate by the physi- cian.

  • For the River Lambourn there was an underestimation of the TWA concentration of uranium by up to 57% when no DBL is accounted for in the calculations, with the TWA calculations using the averaged DBL over the deployment time (Fig.

  • Number of samples needed.Samples taken for determining compliance with the STEL differ from those that measure the TWA concentration in important ways.

Related to TWA concentration

  • Net concentration means the difference between the concentration of a given substance in a sample taken of the discharge and the concentration of the same substances in a sample taken at the intake which supplies water to the given process. For the purpose of this definition, samples that are taken to determine the net concentration shall always be 24-hour composite samples made up of at least six increments taken at regular intervals throughout the plant day.

  • Alcohol concentration means the number of grams of alcohol per:

  • Excess Concentration means the sum of the following amounts, without duplication:

  • Background concentration means such concentration of that substance as is present in:

  • Concentration means the weight of any given material present in a unit volume of liquid. Unless otherwise indicated in this permit, concentration values shall be expressed in milligrams per liter (mg/l).

  • Derived air concentration (DAC) means the concentration of a given radionuclide in air which, if breathed by the reference man for a working year of 2,000 hours under conditions of light work, results in an intake of one ALI. For purposes of these regulations, the condition of light work is an inhalation rate of 1.2 cubic meters of air per hour for 2,000 hours in a year. DAC values are given in Part 4, Appendix 4B, Table 4B1, Column 3.

  • Marijuana concentrate means any type of marijuana product consisting wholly or in part of

  • Daily Concentration means the concentration of a substance as measured in a daily composite sample, or, arithmetic average of all grab sample results defining a grab sample average.

  • iron ore concentrates means products (whether in pellet or other form) resulting from secondary processing but does not include metallised agglomerates;

  • Cannabis concentrate means cannabis that has undergone a process to concentrate one or more active cannabinoids, thereby increasing the product’s potency. Resin from granular trichomes from a cannabis plant is a concentrate for purposes of this division. A cannabis concentrate is not considered food, as defined by Section 109935 of the Health and Safety Code, or a drug, as defined by Section 109925 of the Health and Safety Code.

  • Cannabinoid concentrate means a substance obtained by separating cannabinoids from marijuana by:

  • Medical marijuana concentrate means a specific subset of Medical Marijuana that was produced by extracting cannabinoids from Medical Marijuana. Categories of Medical Marijuana Concentrate include Water-Based Medical Marijuana Concentrate, Food-Based Medical Marijuana Concentrate and Solvent-Based Medical Marijuana Concentrate.

  • Excess Concentration Amount means, as of any date of determination on which any one or more of the Concentration Limitations are exceeded, an amount (calculated by the Servicer and without duplication) equal to the Dollar Equivalent of the portion of the Adjusted Principal Balance of each Eligible Collateral Loan that causes such Concentration Limitation to be exceeded.

  • Residual disinfectant concentration means the concentration of disinfectant measured in mg/L in a representative sample of water.

  • Obligor Concentration Limit At any time, in relation to the aggregate Unpaid Balance of Receivables owed by any single Obligor and its Affiliated obligors (if any):

  • concentrates means flavoring ingredients and, depending on the product, sweeteners used to prepare syrups or finished beverages;

  • Concentration Percentage means (i) for any Group A Obligor, 10.00%, (ii) for any Group B Obligor, 8.00%, (iii) for any Group C Obligor, 6.00% and (iv) for any Group D Obligor, 4.00%.

  • Cannabis processing facility means a person that:

  • Concentration Limit shall have the meaning set forth in the Pricing Side Letter.