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Methyl Bromide Risk Characterization in California (2000) / Chapter Skim
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Appendix C: Calculation of Air Exchange Rates
Pages 90-93

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From page 90...
... is the initial concentration of the contaminant inside the house, C(t) is the concentration of the contaminant at any specific time after t = 0, and k is a rate constant in units of reciprocal time (i.e., if time is expressed in hours, k is in reciprocal hours, or, by convention, "air changes per hourly.
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From page 91...
... In this type of plot, correspondence of the points to the reLognormal plow of adjusted 24-hr exposure data for shallow shank-brped soil fumigation workers / 3.0 o o 2.0 l 1.5 1.0 ,'~ / it/ _' I' .
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From page 92...
... For these same worker groups, Table A-! below compares the reported highest observed values with 95th percentile values calculated from the fitted nominal and lognormal distributions.
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From page 93...
... PUBLIC ACCESS MA TERIALS 93 Dam from "MB exposure data" y = 223.71 ~ 155.22x R2 = 0.890 y = 102~49 ~ 11614x R2 = 0.933 y = 147.00 ~ 111.49x R2 = 0.605 y = 873.75 ~ 574.70x R2 = 0.911 ,' o = Q o ~ / 1000 O / /A Q 2 -1 0 1 2 Z-Score Figure A-2 O C - be , ...
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Key Terms

  • below compares
  • applicators shovelmen
  • lognormal distributions
  • observed values
  • copilots applicators

  • percentile values
  • acute calculated
  • observed acute
  • lognormal fit
  • reciprocal time

  • score figure
  • normal distribution
  • contaminant inside
  • values calculated
  • initial concentration

  • tarp removem
  • rate constant
  • normal lognormal
  • fitted nominal
  • calculated calculated

  • specific time
  • air changes
  • air concentration
  • normal fits
  • reciprocal hours

  • fits project
  • soil fumigation
  • time required
  • exposure data
  • project somewhat


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