Presentation is loading. Please wait.

Presentation is loading. Please wait.

SEPTIC SYSTEM DESIGN Ken Stratton SUBSURFACE WASTEWATER TEAM.

Similar presentations


Presentation on theme: "SEPTIC SYSTEM DESIGN Ken Stratton SUBSURFACE WASTEWATER TEAM."— Presentation transcript:

1

2 SEPTIC SYSTEM DESIGN

3 Ken Stratton

4 SUBSURFACE WASTEWATER TEAM

5 DAVID BRALEY (SUPERVISOR)

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

7 GLENN ANGELL (SITE EVALUATORS)

8 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

15

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

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

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

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

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

21 PROPRIETARY DEVICES STONE FIELD = 20’ X 30’ Concrete Chambers 4’ x 8’ = 64 SQ. FT / UNIT—9.2 (10 UNITS) 8’ X 8’ = 128 SQ. FT. / UNIT (5 UNITS) CLUSTER 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)

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

23

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 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 TOP VIEW PIPING IN SERIES PARALLEL

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

33 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. 3’ 10’ This provision applies only to soils with AIII, B, or C limiting factor conditions, located beneath and downslope of the disposal field 10’ prevent any under drain of the disposal field If shorter distance is required, becomes a state variance

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

35 SYSTEMS AND SLOPES STEP DOWN H20 LOAD RATING 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 Scarification Transitional Horizon and mix Stone & Pipe Min. 4” Backfill Min. 4” Cover FILTER FABRIC

37 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. 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. GSF systems shall not be installed under paved or concreted areas. H20 LOAD RATING

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

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

40 CONCRETE CHAMBERS

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

42 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 bdrm garage 3 bed field bedroom 2 SEPERATE DWELLINGS 1 – 3 BEDROOM = 270 GPD BEDROOM (MIN DESIGN 2 BEDROOMS) 2 BEDROOMS = 180 GPD 5 BEDROOMS

45 3 bdrm garage 3 bed field bedroom 2 SEPERATE DWELLINGS 5 BEDROOMS TANK SIZE=

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.

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

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

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

51 MERRY CHRISTMAS


Download ppt "SEPTIC SYSTEM DESIGN Ken Stratton SUBSURFACE WASTEWATER TEAM."

Similar presentations


Ads by Google