1690 GALLONS PER DAY / PER BEDROOM 594 square feet of disposal field BASE DESIGN FLOW2 BEDROOM HOUSE90 GALLONS PER DAY / PER BEDROOM2 x 90180 gallons per daySoil profile is 3 = 3.3 sq. ft. per gallon180 x 3.3594 square feet of disposal field
17594 square feet of disposal field STONE TRENCH20’2’ WIDE = 4 SQ. FT./ LINEAR FT.= 600 sq. ft.594 / 4 = FEET OF TRENCH3’ WIDE = 5 SQ. FT. / LINEAR FT.594 / 5’= FEET OF TRENCH2’3’30’119’149’STONE DISPOSAL FIELD
18PROPRIETARY DEVICES STONE FIELD = 20’ X 30’ INFILTRATOR CLUSTER = 36 SQ. FT. /UNITTRENCH = 44 SQ. FT. / UNITCLUSTERTRENCH594 / 36 = 16.5 (17) units594 / 44 = 13.5 (14)3 ROWS OF 6 UNITS1 56’ ROW2 28’ROWSAPPROX. 24’ X 11’STONE FIELD = 20’ X 30’
19TRENCH CONFIGURATION ONLY PIPE SPACING MIN. 1.5 FEET CENTER TO CENTER PROPRIETARY DEVICESPRESBY TUBINGTRENCH CONFIGURATION ONLYPIPE SPACING MIN. 1.5 FEET CENTER TO CENTER5 SQ. FT. / LINEAR FOOT40’60’594 / 5 = (119) LINEAR FEET210 SQ. FT2.5 FT SPACING180 SQ. FT4 FT SPACINGSTONE FIELD = 20’ X 30’
20PROPRIETARY DEVICES STONE FIELD = 20’ X 30’ Eljen in-drains / GSF unitsTYPE A594 / 24SQ. FT = (25 UNITS)TYPE B594 / 48 SQ. FT = 12.3 (13 UNITS)STONE FIELD = 20’ X 30’
21PROPRIETARY 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)TRENCH4’ 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’
22DISPOSAL FIELDS MUST BE LEVEL SATURATE ONE END OF THE DISPOSAL FIELD DEFINITION OF LEVELNOT TO EXCEED 2” IN 100 FEETSTONESCARIFICATION / TRANSITIONAL HORIZONSATURATE ONE END OF THE DISPOSAL FIELDMALFUNCTION
30IF ITS NOT LEVEL, IT WONT WORK HOW DOES THE DISTRIBUTION BOX FEED EVENLY TO EACH ROWIF ITS NOT LEVEL, IT WONT WORK
31SYSTEMS AND SLOPES STEP DOWN GSF UNITSPIPING IN SERIESPARALLELTOP VIEW
32What if the downslope fill extension cant catch up with itself?
33If 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 variance10’3’10’prevent any under drain of the disposal fieldThis provision applies only to soils with AIII, B, or C limiting factor conditions, located beneath and downslope of the disposal field
34IF WORKING IN THE SZ, MUST BE CERTIFIED IN EROSION CONTROL SHORELAND ZONE100’75’250’SHORELAND ZONEIF WORKING IN THE SZ, MUST BE CERTIFIED IN EROSION CONTROLTHROUGH DEP
35H20 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.
37H20 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 shallnot be installed under paved or concreted areas.Infiltrator ChamberH-20 load ratingwith 18” of cover.12” fill under pavement and on top of 6” of system sand above tubesFabric is added on top of the System Sand. All H-20 systems require venting.
412 things that come up that effects the disposal systems that is actually a fixture on the internal plumbing
42the 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 percentthe installation of a second septic tank installed in series; or a multiple compartment septic tankthe use of septic tank outlet filtersmust be included in the system design to prevent suspended solids from entering the disposal field
43Water Filtration Devices If known, amount of gallons backwashed should be added into the design