Practice Quiz

Green Plumbing - Question List

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286. An aerobic treatment unit (ATU) system is a suitable alternative to a traditional on-site wastewater treatment system under which condition?
  1. Need a cheaper alternative
  2. Failing existing septic system
  3. Good soil permeability
  4. Interest in long span between pumping out
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287. Each of the following is a key soil property to evaluate for site suitability prior to installing an on-site wastewater treatment system, except:
  1. Texture
  2. Structure
  3. Age
  4. Density
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288. Which of the following would be the best soil for safe and effective on-site wastewater treatment?
  1. Weak structure - firm consistence - high density
  2. Very coarse texture - low density - friable consistence
  3. Strong structure - medium texture - friable consistence
  4. High density - clay texture - strong structure
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289. What is the name of the test that measures the rate at which water permeates wet soil?
  1. Percolation test
  2. Infiltration test
  3. Porosity test
  4. Absorption test
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290. Which of the following is a standard cutoff in terms of percolation rate (minutes it takes for the water to fall one inch during a perc test), above which alternative wastewater treatment systems are generally recommended?
  1. 10 minutes/inch
  2. 30 minutes/inch
  3. 60 minutes/inch
  4. 120 minutes/inch
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