Download OSSF DR TEST PRACTICE QUESTIONS AND ANSWERS| 100%VERIFIED| ALREADY PASSED| LATEST 2025-202 and more Exams Water and Wastewater Engineering in PDF only on Docsity!
OSSF DR TEST PRACTICE QUESTIONS
AND ANSWERS| 100%VERIFIED|
ALREADY PASSED| LATEST 2025- 2026
______ 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 half way up from the bottom? 846 gals
Nitrogen or nitrate removal in soil occurs by _________. vegetation uptake The factors influencing 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 A solid that can be filtered out of the wastewater is a _________. suspended solid Which of the following describes domestic wastewater as it leaves a home? fresh, light in color, has dissolved oxygen Which of the following are problems caused by malfunctioning septic tank systems? surface water pollution, groundwater contamination, and standing sewage in neighborhoods An inorganic chemical that affects human health is nitrate
Parasites (helminths) found in untreated sewage include ________. hookworm, round worms, and tapeworms Viruses are responsible for such diseases as poliomyelitis and infectious hepatitis A type of bacteria that indicates sewage contamination is ________. fecal coliform Protozoa are very simple animal organisms that may cause ________. amoeba dysentery and Giardiasis Waterborne diseases that spread by pathogenic bacteria include _________. typhoid, cholera, and dysentery Microorganisms in wastewater include __________. bacteria, viruses, protozoa and helminths. Microorganisms that cause disease are called _________. pathogens Domestic wastewater contains microorganisms that are capable of causing _________.
List the equipment and procedures to protect a work site. signs, regulated speed, cones, barricade, high level flags Who can legally install a septic tank followed by a low-pressure dosing drain field at a rental house? Installer II Planning materials for an OSSF utilizing secondary treatment must be prepared by a/an PE (professional engineer) or RS (registered sanitarian) Penalties for violating the laws, rules, or regulations covering OSSF can be imposed under what headings criminal, injunction, administrative List the 9 steps of the permitting process
- Site Evaluations
- Selection of an OSSF
- System must be planned
- Professional designer (PE or RS) submits planning materials
- Permit application and planning materials must be prepared and submitted
- The application and planning materials are reviewed by permitting authority
- Authorization or permit to construct (ATC) must be granted by permitting authority BEFORE construction can begin
- Construction begins after ATC recieved.
- System must be inspected by permitting agency.
- Notice of approval (NOA) and permit or license to operate will be issued by the permitting agency when completed System has passed all inspections. New OSSF licenses are issued for a term of ______. An individual must complete _______ of TCEQ-approved continuing education courses in order to renew license. 3 years, 24 hours What is needed to pre-qualify for an exam? submitting an application and notarized experience statements, paying class and application fees, and successfully completing the appropriate training course
_______ adopted the current OSSF Rules in 1997 and revised them several times TCEQ Class II soils include the USDA classes of _________ and __________. sandy loam, loam The _________ is a tool to graphically delineate soil textural classes. USDA soil textural triangle List the two unsuitable types of soil structure or structural condition. Platy (like a stack of plates) Massive ( can't break it up, huge pieces) A soil color pattern of orange and brown on a background of gray or bluish color is called mottling The ideal soil environment for organic effluent decomposition is one of good ______ and ________. soil air, soil water balance
Soil associations are _______ units which encompass broad areas with similar patterns of __________, __________, __________, and _________. soil. soil profiles, vegetation, relief, and drainage The county ____________________ is an essential tool for conducting a site evaluation but does not take the place of the on-site field soil evaluation. soil survey Sites with greater than ____ percent slope are unsuitable. 30 A minimum lot size of _______ acre is required for subdivisions serviced by _________ water. The minimum size is ______ acre for those serviced by ___________. 0.5, public, 1, private well Soil evaluation pits shall be excavated to a depth of _____ inches below the proposed _________ or to a _________ horizon, whichever is shallower. 24, drainfield, restrictive
Soil suitability factors include: _________, ________, and _________. soil texture, soil depth, and restrictive horizon Overall site suitability factors include ________, ________, ___________, and ____________. site factor, soil factors, groundwater evaluation, and surface drainage analysis A common reason for wastewater system failure is __________. hydraulic overloading (due to modernized tank usually) The value Q is Quantity of Sewage (GPD) Some malfunctioning OSSF can be made to function properly with minimal cost by implementing ______________. water conservation measures. In estimating water usage for a single-family dwelling, the number of _________ in the home is a key indicator; however, _________ should also be considered. bedrooms, square footage List four water saving plumbing devices that can be used in a home.
low flow toilets, low flow shower head, low flow faucets, pressure reducing valves Identify four water-saving habits homeowners should adopt don't leave water running, full laundry and dishwasher loads, reduce/eliminate use of garbage disposals, not using toilet for trash disposal Two wastewater tests commonly used to measure the strength of sewage are the ________ test and the ________ test. BOD, TSS The minimum water usage rate that should be used for planning an OSSF for a new home with three bedrooms and 3000 square feet of interior living area is _______ gallons/day. 300 Blockage in the home plumbing system is often caused by _______, ________, and _________. oils, greases, and fats
The most commonly use primary treatment component in Texas for on-site systems is the septic tank Which of the following produces the highest quality effluent? city sewage treatment plant what is the purpose of the inlet baffle or T? Reduce velocity and disperse flow, vent the tank to the building plumbing The minimum distances a watertight sewage treatment tank should be from a water-well and a property line are 50 feet and 5 feet respectively which of the following is true regarding septic tanks? The must have two- or three-compartments A septic tank serving a new five-bedroom home with 3800 sqft must have a minimum capacity of 1,250 gallons Of what materials may a septic tank be constructed?
steel reinforced concrete The expected volume of wastewater (Q) in gal/day from an older (pre-1990) three- bedroom mobile home would be 300 Which of the following characteristics should a poured-in-place concrete septic tanks have? watertight, designed by PE, Structurally sound The standard inlet and outlet devices in a septic tank should be tees Properly sealed septic tanks are vented through the building plumbing The liquid depth of a septic tank must be at least 30 inches Which of the following is true of a septic tank with 15 inches of cover? it must have an access port with a riser
T/F: Two single-compartment septic tanks in series are allowed T How many spray heads would be needed for an older four bedroom home without water-saving devices in Beaumont, Texas (note: extreme southeast Texas) to meet minimum requirements for spray are is rotary heads sent out a spray 30 feet? 4 T/F: A two-compartment septic tank is allowed T T/F: One single-compartment septic tank that is sized properly is allowed. F T/F: Tees are allowed for inlet and outlet devices T T/F: An inlet line should be at least 3 inches above the liquid level. T T/F: A leakage from the tank or joints of 1.6 gallons/hour is permissible F
T/F: A 12-inch port (minimum) must be provided in the top of the tank T T/F: The first compartment should be smaller than the second compartment F....Should be 1/2 to 2/3s the second T/F: Outlet Tee should extend to the bottom of the tank F T/F: The tank must be level T T/F: A minimum 4-inch-thick sand, sandy loam, clay loam, or pea gravel pad is required under prefabricated tanks T The standard drainfield depth in East and Central Texas is limited to 18 inches minimum and 36 inches maximum The minimum distance between standard drainfield excavations is 3 feet Grease interceptors are needed
