GEOG 1400 EXAMPREP FINAL PAPER 2026
QUESTIONS WITH SOLUTIONS GRADED A+
▶ T/F: The tank must be level? Answer:T
▶ T/F: A minimum 4-inch-thick sand, sandy loam, clay loam, or pea gravel
pad is required under prefabricated tanks? Answer:T
▶ The standard drainfield depth in East and Central Texas is limited to?
Answer:18 inches minimum and 36 inches maximum
▶ The minimum distance between standard drainfield excavations is?
Answer:3 feet
▶ Grease interceptors are needed? Answer:on wastewater lines from
commercial kitchens
▶ Which of the following is true if porous media in a standard drainfield??
Answer:It should be uniform in size, it should be 0.75 inch to 2 inches in
size, it should be clean and resistant to breakdown
▶ A standard drainfield excavation should? Answer:be level within 1 inch
per 25 feet or a maximum of 3 inches whichever is less
▶ A standard perforated drainline should be which of the following??
Answer:3 inches to 4 inches in diameter, a maximum length of 150 feet,
laid parallel in multiple-line system
▶ The purpose of the geotextile fabric over gravel is to? Answer:prevent
backfill from entering porous media
▶ A pumped effluent drainfield? Answer:is an alternative for well-drained
clay soils on nearly level sites, has a 2% or less slope for single-family
dwellings only
▶ Which of the following must be known prior to actually laying out a new
OSSF?? Answer:building location, size of the property, soil conditions in
the drainfield
QUESTIONS WITH SOLUTIONS GRADED A+
▶ T/F: The tank must be level? Answer:T
▶ T/F: A minimum 4-inch-thick sand, sandy loam, clay loam, or pea gravel
pad is required under prefabricated tanks? Answer:T
▶ The standard drainfield depth in East and Central Texas is limited to?
Answer:18 inches minimum and 36 inches maximum
▶ The minimum distance between standard drainfield excavations is?
Answer:3 feet
▶ Grease interceptors are needed? Answer:on wastewater lines from
commercial kitchens
▶ Which of the following is true if porous media in a standard drainfield??
Answer:It should be uniform in size, it should be 0.75 inch to 2 inches in
size, it should be clean and resistant to breakdown
▶ A standard drainfield excavation should? Answer:be level within 1 inch
per 25 feet or a maximum of 3 inches whichever is less
▶ A standard perforated drainline should be which of the following??
Answer:3 inches to 4 inches in diameter, a maximum length of 150 feet,
laid parallel in multiple-line system
▶ The purpose of the geotextile fabric over gravel is to? Answer:prevent
backfill from entering porous media
▶ A pumped effluent drainfield? Answer:is an alternative for well-drained
clay soils on nearly level sites, has a 2% or less slope for single-family
dwellings only
▶ Which of the following must be known prior to actually laying out a new
OSSF?? Answer:building location, size of the property, soil conditions in
the drainfield
