OSSF DR TEST PRACTICE QUESTIONS WITH VERIFIED ANSWERS
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Course
OSSF DR
Institution
OSSF DR
OSSF DR TEST PRACTICE QUESTIONS
WITH VERIFIED ANSWERS
_______ and ________ soil textural classes are always unsuitable for standard absorptive OSSF
class IA and IV
List each of the major soil horizons surface soil A, surface soil B, and parent material
_____________ is a term describin...
OSSF DR TEST PRACTICE QUESTIONS WITH VERIFIED A NSWERS _______ and ________ soil textural classes are always unsuitable for standard absorptive OSSF ✔✔class IA and IV List each of the major soil horizons ✔✔surface soil A, surface soil B, and parent material _____________ is a term describing the ability of water to migrate through a soil profile under either _________ or __________ conditions. ✔✔Hydraulic conductivity, saturated, unsaturated Interconnected pores in the soil profile allow ______ and _______ to enter the soil at its surface and migrate downward ✔✔air, water List the four components of soil ✔✔air, water, organics, inorganics A drainfield is 50 feet by 90 feet and must be covered with an average of 15 inches of sand loam. How many cubic yards of sandy loam soil must be purchased (find the volume of a rectangular object)? ✔✔208.3 cubic yards What would be the volume of a 5 -foot-diameter pump tank that is 5 feet tall with the inlet 1 foot below the rim? ✔✔587 gals What would be the percent slope on a lot 250 feet deep that drops 20 feet in elevation over the depth of the lot? ✔✔8% How many cubic yards of gravel would be needed to fill a ditch 3 feet deep, 10 feet wide, and 12 feet long with 18 inches of gravel? 1 cubic yard = 27 cubic feet. ✔✔6.67 cubic yards A septic tank is 6 feet in diameter and is 8 feet deep. How many gallons will it hold if the overflow line is located ha lf way up from the bottom? ✔✔846 gals Calculate the working liquid capacity (volume) for this septic tank. SEE PAGE 2 -39!! ✔✔1077gals What is the surface area (area in square feet) of an evapotranspiration system 40 feet wide and 65 feet long? ✔✔2,600 sq ft Figure the acreage for a piece of property that measures 256 feet on each of four sides. ✔✔1.5 acres Figure the area of a lot that measures 60ft by 280ft ✔✔16,800sqft ,0.39 acres A disposal option that might be considered in a clay soil would be a __ ______. ✔✔drip or spray irrigation The primary treatment device providing the least or poorest treatment of domestic wastewater would be _______. ✔✔septic tank Nitrogen or nitrate removal in soil occurs by _________. ✔✔vegetation uptake The factors infl uencing the survival of bacteria in soil are _______. ✔✔moisture, temperature, pH, and organic matter. Physical removal of bacteria by straining occurs when _______. ✔✔the bacteria are larger than the pore openings in the soil
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