2. SEPTIC
SYSTEM
DESIGN

3. Ken
Stratton

4. SUBSURFACE
WASTEWATER
TEAM

5. DAVID BRALEY
(SUPERVISOR)

6. (1ST TIME VARIANCES-HIP REVIEWS)
JIM JACOBSEN
(1ST TIME VARIANCES-HIP REVIEWS)

7. GLENN ANGELL
(SITE EVALUATORS)

8. (LPI’S & REPLACEMENT VARIANCES)
BRENT LAWSON
(LPI’S & REPLACEMENT VARIANCES)

9. THESE RULES ARE IN PLACE FOR
HEALTH AND SAFETY

10. TYPES OF SYSTEMS
STONE DISPOSAL FIELD

11. INFILTRATOR -
BIO-DIFFUSER

12. ENVIROSEPTIC TUBES -
GEOFLOW

13. ELJEN
GSF
(IN-DRAINS)

14. CONCRETE CHAMBERS

16. 90 GALLONS PER DAY / PER BEDROOM 594 square feet of disposal field
BASE DESIGN FLOW
2 BEDROOM HOUSE
90 GALLONS PER DAY / PER BEDROOM
2 x 90
180 gallons per day
Soil profile is 3 = 3.3 sq. ft. per gallon
180 x 3.3
594 square feet of disposal field

17. 594 square feet of disposal field
STONE TRENCH
20’
2’ WIDE = 4 SQ. FT./ LINEAR FT.
= 600 sq. ft.
594 / 4 = FEET OF TRENCH
3’ WIDE = 5 SQ. FT. / LINEAR FT.
594 / 5’= FEET OF TRENCH 2’ 3’
30’
119’
149’
STONE DISPOSAL FIELD

18. PROPRIETARY DEVICES STONE FIELD = 20’ X 30’
INFILTRATOR CLUSTER = 36 SQ. FT. /UNIT
TRENCH = 44 SQ. FT. / UNIT
CLUSTER
TRENCH
594 / 36 = 16.5 (17) units
594 / 44 = 13.5 (14)
3 ROWS OF 6 UNITS
1 56’ ROW
2 28’ROWS
APPROX. 24’ X 11’
STONE FIELD = 20’ X 30’

19. TRENCH CONFIGURATION ONLY PIPE SPACING MIN. 1.5 FEET CENTER TO CENTER
PROPRIETARY DEVICES
PRESBY TUBING
TRENCH CONFIGURATION ONLY
PIPE SPACING MIN. 1.5 FEET CENTER TO CENTER
5 SQ. FT. / LINEAR FOOT
40’
60’
594 / 5 = (119) LINEAR FEET
210 SQ. FT
2.5 FT SPACING
180 SQ. FT
4 FT SPACING
STONE FIELD = 20’ X 30’

20. PROPRIETARY DEVICES STONE FIELD = 20’ X 30’
Eljen in-drains / GSF units
TYPE A
594 / 24SQ. FT = (25 UNITS)
TYPE B
594 / 48 SQ. FT = 12.3 (13 UNITS)
STONE FIELD = 20’ X 30’

21. PROPRIETARY DEVICES Concrete Chambers STONE FIELD = 20’ X 30’ CLUSTER
4’ x 8’ = 64 SQ. FT / UNIT—9.2 (10 UNITS)
8’ X 8’ = 128 SQ. FT. / UNIT (5 UNITS)
TRENCH
4’ X 8’ WITH 1’ OF STONE ALONG THE 4’ LENGTH = 77 SQ. FT./UNIT (8UNITS)
8’ X 8’ WITH 1’ OF STONE ALONG THE 8’ LENGTH = 90 SQ. FT /UNIT—6.6 (7 UNITS)
STONE FIELD = 20’ X 30’

22. DISPOSAL FIELDS MUST BE LEVEL SATURATE ONE END OF THE DISPOSAL FIELD
DEFINITION OF LEVEL
NOT TO EXCEED 2” IN 100 FEET
STONE
SCARIFICATION / TRANSITIONAL HORIZON
SATURATE ONE END OF THE DISPOSAL FIELD
MALFUNCTION

24. SYSTEMS AND SLOPES
STONE FIELD

25. SYSTEMS AND SLOPES
STONE FIELD

26. SYSTEMS AND SLOPES
STONE FIELD

27. SYSTEMS AND SLOPES STEP DOWN
TOP
VIEW

28. SYSTEMS AND SLOPES STEP DOWN
GSF UNITS
TOP VIEW

29. MULTI – PORT
DISTRIBUTION BOX

30. IF ITS NOT LEVEL, IT WONT WORK
HOW DOES THE DISTRIBUTION BOX FEED EVENLY TO EACH ROW
IF ITS NOT LEVEL, IT WONT WORK

31. SYSTEMS AND SLOPES STEP DOWN
GSF UNITS
PIPING IN SERIES
PARALLEL
TOP VIEW

32. What if the downslope fill extension cant catch up with itself?

33. If shorter distance is required, becomes a state variance
A man-made retaining wall, provided the retaining wall is no more than 24 inches in height and the horizontal distance from the outer edge of the fill shoulder to the retaining wall is at least 10 feet.
If shorter distance is required, becomes a state variance
10’ 3’
10’
prevent any under drain of the disposal field
This provision applies only to soils with AIII, B, or C limiting factor conditions, located beneath and downslope of the disposal field

34. IF WORKING IN THE SZ, MUST BE CERTIFIED IN EROSION CONTROL
SHORELAND ZONE
100’
75’
250’
SHORELAND ZONE
IF WORKING IN THE SZ, MUST BE CERTIFIED IN EROSION CONTROL
THROUGH DEP

35. H20 LOAD RATING SYSTEMS AND SLOPES STEP DOWN Vehicular traffic:
Except where site limitations make it impractical, no driveway or parking or turning area may be located over any disposal field. When a system is placed under an area receiving vehicular traffic, H-20 loading components must be installed.

36. Original ground
FILTER FABRIC
Scarification
Min. 4” Backfill
Transitional Horizon and mix
Min. 4” Cover
Stone & Pipe

37. H20 LOAD RATING SYSTEMS AND SLOPES Vehicular traffic:
Except where site limitations make it impratical, no driveway or parking or turning area may be located over any disposal field. When a system is placed under an area receiving vehicular traffic, H-20 loading components must be installed.
GSF systems shall
not be installed under paved or concreted areas.
Infiltrator Chamber
H-20 load rating
with 18” of cover.
12” fill under pavement and on top of 6” of system sand above tubes
Fabric is added on top of the System Sand. All H-20 systems require venting.

38. H20 LOAD RATING INFILTRATORS 18” COVER BACKFILL PER SPECS
SCARIFICATION & TRANSITION HORIZON

39. H20 LOAD RATING 12” OF BACKFILL FILTER FABRIC 6” AROUND TUBES OF
SYSTEM SAND
SCARIFICATION & TRANSITIONAL HORIZON

40. CONCRETE CHAMBERS

41. 2 things that come up that effects the disposal systems that is actually a fixture on the internal plumbing

42. the use of septic tank outlet filters
Garbage disposal:
Garbage disposals should not be used with disposal fields. However, if such units are proposed to be used, other measures must be taken, such as:
increasing septic tank capacity by a minimum of 30 percent
the installation of a second septic tank installed in series; or a multiple compartment septic tank
the use of septic tank outlet filters
must be included in the system design to prevent suspended solids from entering the disposal field

43. Water Filtration Devices
If known, amount of gallons backwashed should be added into the design

44. 3 bed field
2 SEPERATE DWELLINGS
1 – 3 BEDROOM = 270 GPD
1000
1 - 1 BEDROOM
(MIN DESIGN 2 BEDROOMS)
2 BEDROOMS = 180 GPD
3 bdrm
5 BEDROOMS
+ 1 bedroom
garage

45. 3 bed field
2 SEPERATE DWELLINGS
5 BEDROOMS
1000
TANK SIZE=
3 bdrm
+ 1 bedroom
garage

46. 1 dwelling = 3 bedrooms
1 dwelling = 2 bedrooms
5 bedrooms total

47. 1 dwelling = 3 bedrooms 1 dwelling = 2 bedrooms 5 bedrooms total
1750 gal.
1 dwelling = 3 bedrooms
1 dwelling = 2 bedrooms
5 bedrooms total

48. 3 bed field
Expand by 2 bed
2 SEPERATE DWELLINGS
5 BEDROOMS
1000
TANK SIZE=
1750 gal.
3 bdrm
750
+ 1 bedroom
garage

49. 3 bed field
Expand by 2 bed
2 SEPERATE DWELLINGS
5 BEDROOMS
1000
TANK SIZE=
1750 gal.
3 bdrm
750
+ 1 bedroom
garage

50. 3 bed field
1 UNIT = 4 BEDROOMS
2 SEPERATE DWELLINGS
5 BEDROOMS
1000
TANK SIZE=
1000 gal.
1750 gal.
Shoreland zone = install expansion
3 bdrm
Outside = record with Reg. of Deeds
+ 1 bedroom
garage

51. MERRY CHRISTMAS