Washington State septic installers
UPDATED ACTUAL Questions and
CORRECT Answers
what is the minimum separation for a well or suction line (list all 3) - CORRECT
ANSWER - 100', 50', 50'
what is the minimum separation for a public well (list all 3) - CORRECT ANSWER -
100',100',100'
what is the minimum separation for a water main (list all 3) - CORRECT ANSWER -
10',10',10'
what is the minimum separation for a surface water table at normal height - CORRECT
ANSWER - 100',50',10'
soil type 1 - CORRECT ANSWER - Gravelly and very gravelly coarse sands, all
extremely gravelly soils excluding soil types 5 and 6, all soil types with greater than or equal to
90% rock fragments.
soil type 2 - CORRECT ANSWER - Coarse sands.
solid type 3 - CORRECT ANSWER - Medium sands, loamy coarse sands, loamy medium
sands
soil type 4 - CORRECT ANSWER - Fine sands, loamy fine sands, sandy loams, loams.
soil type 5 - CORRECT ANSWER - Very fine sands, loamy very fine sands; or silt loams,
sandy clay loams, clay loams and silty clay loams with a moderate or strong structure
, soil type 6 - CORRECT ANSWER - Other silt loams, sandy clay loams, clay loams, silty
clay loams.
soil type 7 - CORRECT ANSWER - Sandy clay, clay, silty clay, strongly cemented or
firm soils
what is the minimum design flow per capita per day - CORRECT ANSWER - 45 gpd
what is the minimum design flow per bedroom per day - CORRECT ANSWER - 120 gpd
or 90 gallons x 1.33 per bedroom
what is the minimum design limit for a 3 bedroom home - CORRECT ANSWER - 900
gallons
what is the maximum effluent loading rate for soil type 1 - CORRECT ANSWER -1
gallon per sqft per day
what is the maximum effluent loading rate for soil type 2 - CORRECT ANSWER -1
gallon per sqft per day
what is the maximum effluent loading rate for soil type 3 - CORRECT ANSWER - .8
gallon per sqft per day
what is the maximum effluent loading rate for soil type 4 - CORRECT ANSWER - .6
gallon per sqft per day
what is the maximum effluent loading rate for soil type 5 - CORRECT ANSWER - .4
gallon per sqft per day
what is the maximum effluent loading rate for soil type 6 - CORRECT ANSWER - .2
gallon per sqft per day
UPDATED ACTUAL Questions and
CORRECT Answers
what is the minimum separation for a well or suction line (list all 3) - CORRECT
ANSWER - 100', 50', 50'
what is the minimum separation for a public well (list all 3) - CORRECT ANSWER -
100',100',100'
what is the minimum separation for a water main (list all 3) - CORRECT ANSWER -
10',10',10'
what is the minimum separation for a surface water table at normal height - CORRECT
ANSWER - 100',50',10'
soil type 1 - CORRECT ANSWER - Gravelly and very gravelly coarse sands, all
extremely gravelly soils excluding soil types 5 and 6, all soil types with greater than or equal to
90% rock fragments.
soil type 2 - CORRECT ANSWER - Coarse sands.
solid type 3 - CORRECT ANSWER - Medium sands, loamy coarse sands, loamy medium
sands
soil type 4 - CORRECT ANSWER - Fine sands, loamy fine sands, sandy loams, loams.
soil type 5 - CORRECT ANSWER - Very fine sands, loamy very fine sands; or silt loams,
sandy clay loams, clay loams and silty clay loams with a moderate or strong structure
, soil type 6 - CORRECT ANSWER - Other silt loams, sandy clay loams, clay loams, silty
clay loams.
soil type 7 - CORRECT ANSWER - Sandy clay, clay, silty clay, strongly cemented or
firm soils
what is the minimum design flow per capita per day - CORRECT ANSWER - 45 gpd
what is the minimum design flow per bedroom per day - CORRECT ANSWER - 120 gpd
or 90 gallons x 1.33 per bedroom
what is the minimum design limit for a 3 bedroom home - CORRECT ANSWER - 900
gallons
what is the maximum effluent loading rate for soil type 1 - CORRECT ANSWER -1
gallon per sqft per day
what is the maximum effluent loading rate for soil type 2 - CORRECT ANSWER -1
gallon per sqft per day
what is the maximum effluent loading rate for soil type 3 - CORRECT ANSWER - .8
gallon per sqft per day
what is the maximum effluent loading rate for soil type 4 - CORRECT ANSWER - .6
gallon per sqft per day
what is the maximum effluent loading rate for soil type 5 - CORRECT ANSWER - .4
gallon per sqft per day
what is the maximum effluent loading rate for soil type 6 - CORRECT ANSWER - .2
gallon per sqft per day
