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Homeowners Installer Test

 

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Section I:     Multiple Choice

For problems 1 through 20 select the letter of the best response from the drop down list.  You may use the responses listed once, more than once, or not at all (1 point each).

1. Septic system drainfields must be installed at a minimum horizontal separation of ___ feet from a well:

   

2. Septic tanks must be installed at a minimum horizontal separation of ____ feet from a building foundation:

 

 

 

3. All septic system components must be installed at a minimum separation of ____ feet from any pressurized water line:

 

  

4. The minimum horizontal separation from a drainfield trench to a building foundation or patio is___ feet:

 

  

5. The total depth of gravel used along the drainfield trenches is ____inches:

 

 

 

6. A cleanout to surface grade is required on sewer line from house to septic tank at a minimum of ___ feet from building:

 

 

 

7. Septic system drainfield laterals require ____ observation port(s) per lateral:

 

 

 

8. The minimum horizontal separation between a drainfield trench and property or easement line is ____ feet:

 

 

 

9. ____ inches of drain rock are required below the perforated pipe in a gravity drainfield:

 

 

 

10. The minimum separation of the solid pipe between D-box and start of perforated drainfield pipe or gravel less chamber is_____ feet:

 

 

 

11. Septic system drainfield trenches should be separated by ____feet center to center:

 

  

12. Septic tanks must be installed at a minimum of ____ feet from a single family well:

 

  

13. Any septic tank with a mid-lateral seam must be watertight tested for ____hours prior to final inspection:

 

 

 

14. The maximum grade of a gravity drainfield lateral allows for ____ inches of fall per 50 feet:

 

 

 

15. Drain rock must be washed, free of fines, and vary from ____ inches in size:

 

 

 

16. The inlet of the septic tank must be ____then the outlet of the septic tank by a minimum of ___inches:

 

 

 

17. When there are more than _____ laterals, a D-box is required to split flows evenly.

 

 

 

18. A septic tank outlet must be _____ than the inlet to function correctly:

 

 

 

19. Risers on septic tanks shall be a minimum of ___inches in diameter:

 

 

 

20. The inlet of the D-box must be _____than all the outlets of the D-box to function properly:

 

 

 

Section II:       True or False

For problems 21 through 30, decide if the statement is true or false.  If the statement is true, mark T in the space to the right of the number; if the statement is false, mark F in the space.  (1 point each).

21. Clean outs to surface grade are required every fifty feet between the septic tank and the drainfield.

22. Septic tank riser lids must be a minimum of 6 inches below grade or above.

23. All piping must be connected with glued fittings or couplers.

24. All wells within 100 feet of the proposed drainfield area must be known prior to installation.

25. When requesting for a final inspection riser lids must be left off the septic tank, to make it easier for inspector. 

26. The slope on the last 5 feet before the tank must not be more than ¼” per foot. 

27. The trenches are permitted to be 3 feet wide, unless previously discussed with inspector. 

28. A minimum drop of 3 inches is required between tank and header line or D-box. 

29. All septic systems must receive a final inspection approval from the BFHD inspector prior to backfilling.

30. All septic tanks must be on the States List of Registered Sewage Tanks.

Section III: Fill In The Blank

For problems 31 through 50, choose the best response.  Place the letter of the response you choose in the space to the right of the number (1 point each).

31. The drain rock must be separated from the backfill material by:

 Newspaper Straw Untreated building paper
 Non-woven geotextile fabric Cardboard 

32. The best use of the land over a drainfield would be:

 A Livestock Corral A Lawn A Parking Area
 A Garden An Orchard 

33. Which of the following is not required of septic tanks:

 Risers to surface grade Secured to prevent unauthorized entry 50' from a single family well
 Watertight All are required of septic tanks 

34. Where can you find the required trench depth of the drainlines:

 Your Septic Permit BFHD Board of Health Rules and Regs No.2 Drainfield cross-section sheet
 Trench depth is a standard known depth of 36 inches Both A and C 

35. Distribution boxes must be:

 Level Watertight Set up to provide equal distribution
 All of the above  

36. Gravelless chambers do not require:

 Filter fabric over the chambers A plastic drop box Step-downs
 A distribution box a serial network 

37. For a system requiring three 90’ laterals, equal distribution should be accomplished using:

 Four-inch PVC tees A plastic drop box Step-downs
 A distribution box A serial network 

38. When abandoning and installing a new septic tank, the following action is not required:

 Have the tank pumped Excavate and remove the failed tank Remove or destroy lid
 Permit for new tank Backfill with soil 

39. The reserve area of a septic system drainfield:

 Must be 75% of the active drainfield Can be used for shop/garage construction Allows for a space to drill a well
 Should be used to drain snowmelt away from the system Allows for repair when a system fails 

40. The slope on the last ___feet before the tank must not be more than ¼” per foot. 

 2 4 
 5 10 

41. The minimum pipe rating required in Benton and Franklin Counties for septic tank inlet and outlet lines is:

 Schedule 40 PVC 4" ABS or PVC 1000 lb crush strength 4" ABS or PVC 4000 lb crush strength
 ASTM D1785 ABS 1210 

42. Minimum slope is ____per foot from the house to the tank (plumber’s grade). 

 1/8" 1/4" 
 1/5" 1/3" 

43. To request a final inspection of your drainfield installation you must:

 Call the environmental Health front desk Submit the request on our website Call your inspector to see when they are available

44. The minimum pipe rating required in Benton and Franklin Counties for drainfield lines: 

Schedule 40 PVC 4" PVC, perforated pipe 1000 lb crush strength4" ABS or PVC 4000 lb crush strength
 ASTM D1785ABS 1210 

45. Drainfield trenches must meet all of the following except:

 Installed in original, undisturbed soil No deeper than specified on the permit Separated by 10 foot on center
 Pipe fitting joints must be glued Sloped - no more than 2 inches of drop per 100 feet 
46. From the D-box outlet to the start of perforated pipe and/or chambers, you must have ____feet of solid pipe.
 1 5 
 10 3 

47. Pipe and gravel drainfields require all of the following except:

 At least 6" of drainrock in the bottom of the trench A minimum drainrock depth of 12" Perforated pipe drain holes oriented at 10 and 2 o'clock
 Observation ports on the ends of laterals Non-woven geotextile filter fabric separating drainrock and backfill 

48. Maximum allowable backfill soil depth over drainfield trenches is:

6-12"12-24" 
24"12-18" 

49. At final inspection the system must:

Have all components installed, tank properly bedded with top exposed, lids secured, and no part of the install backfilled. Have D-Box level and brought to surface grade
 Have any sleeving exposed All of the above 

50. If a problem is encountered during install, you should do the following:

Note it on your inspection request submittal Stop work and call the Health District for further information
 Mention the issue you encountered with the inspector when they are out for inspection Proceed with the best option
 

 



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