OSSF EXAM NEW ACTUAL EXAM WITH 100% VERIFIED QUESTIONS AND CORRECT ANSWERS UPDATED | ACE YOUR GRADES.

OSSF EXAM NEW ACTUAL EXAM WITH 100% VERIFIED QUESTIONS AND CORRECT ANSWERS UPDATED | ACE YOUR GRADES. 1. Which of the following is a likely cause of a "rotten egg" odor from an aerobic treatment plant? - correct answer -Mechanical aerator failure, hydraulic overload caused by leaking toilet 2. Which of the following is true of standard intermittent sand filter? - correct answer -provides secondary wastewater treatment, has a maximum surface loading rate of 1.2 gal/day/sqft, requires at least 24 inches of filter media which meets definite specifications (ASTM C-33) 3. When would an intermittent sand filter with disinfection system be selected over a properly designed and installed septic tank system? - correct answer -For a standard drainfield in class Ia soil 4. Trickling filters and wetlands - correct answer -are secondary treatment processes Page | 2 5. Which of the following considerations should receive the greatest emphasis in selecting a type of OSSF disposal option? - correct answer -soil and site conditions 6. On a West Texas site with 16 inches of Class Ia soil over fractured rock, suitable OSSFs would include - correct answer lined ET or mound systems 7. Which of the following is a way to evaluate an aerobic treatment plant for excessive solids and need for wasting? - correct answer - 30-minute settling test 8. What are the minimum soil requirements for leaching chambers or gravelless pipe systems following a septic tank? - correct answer - The same as for a standard absorptive drainfield, 2 feet of welldrained Class Ib, II, or III soil below the field bottom 9. OSSF surface application always requires - correct answer -at least secondary treatment and disinfection Page | 3 10. Surface application is often selected over other OSSF disposal options because of - correct answer -clay soils and/or seasonal groundwater problems 11. What must be known to determine the size of spray area required for an OSSF spray irrigation system? - correct answer -Rate of irrigation (Ri) allowed in that area and (Q) in gal/day 12. The setback from a public water well for an aerobic plant is - correct answer -50 feet 13. A maintenance provider for a surface application OSSF using a proprietary aerobic plant must have an employee who is - correct answer -a licensed maintenance provider or a registered maintenance technician 14. OSSF disposal systems that are routinely required to have maintenance contracts are - correct answer -surface and subsurface drip irrigation Page | 4 15. What is the purpose of requiring an affidavit to be filed with the county real property records for a surface application system? - correct answer -to notify future property owners of the type of OSSF used and the maintenance requirements 16. Systems that routinely require a pump tank include - correct answer -surface and drip irrigation and sand filters 17. When a maintenance contract is required for a single-family residence OSSF, the minimum frequency of site visits and type of testing is - correct answer -once every four months with chlorine residual or fecal coliform testing 18. Required samples for testing from a surface application system are collected from - correct answer -the pump tank effluent line port 19. An LPD system for a new three-bedroom home with 2200 Sq ft (having water-saving devices) with 9-inch-wide trenches with 1 foot of gravel depth installed in Class III soil would require __________ linear feet of dosing pipe. - correct answer -400 Page | 5 20. An important part of the installation of an LPD system is - correct answer -checking and adjusting pressure on lines 21. Drip irrigation systems are most sensitive to which type of contaminant? - correct answer -suspended solids 22. A mound or soil substitution drainfield is often used - correct answer -when existing soils will not provide adequate treatment due to depth or texture 23. How many cubic yards of ASTMC-33 sand media must be purchased for an intermittent sand filter treating wastewater from a new four bedroom home (with water-saving devices) in order to meet minimum state requirements? - correct answer - 18.5 24. _______ and ________ soil textural classes are always unsuitable for standard absorptive OSSF - correct answer class IA and IV