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Free exam practice for Washington wastewater treatment operators.

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A pump transfers 10,000 gallons at an average measured rate of 400 gpm. How many minutes does the transfer take?

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Curated values teach an average transfer rate over a measured interval. They are not instantaneous pump capacity, pump-curve performance, head, efficiency, equipment selection, or an operating target.

This Draft family uses selected mathematical facts only. It does not reproduce an official formula sheet or claim Washington exam weighting.

  • Printed page 2 of 10, Detention Time
  • Printed page 8 of 10, Abbreviations: gal, gpd, gpm, hr, MG, MGD, and min
  • Chapter 5, Table 6: 1 min = 60 s; 1 h = 60 min = 3,600 s; 1 d = 24 h = 86,400 s
  • Exam Content, printed page 4 of each Class I-IV document, Units for Calculations and calculation-item totals
  • Exam Information, How can I find exam study materials?