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 strength | 4" ABS or PVC 4000 lb crush strength |
ASTM D1785 | ABS 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 |