(1) All systems must
conform to the minimum setback distance for septic tanks, holding tanks, pump
chambers, treatment units and soil absorption systems, including reserve area,
measured in feet and as set forth below. Where more than one setback applies,
all setback requirements shall be satisfied.
|
Septic Tank Holding Tank Pump Chamber Treatment
Unit Grease Traps
|
Soil Absorption System
|
|
Property Line
|
10[5]
|
10[5]
|
|
Cellar or Crawl Space Wall, Swimming Pool
(inground), foundation drain
|
10
|
20
|
|
Slab Foundation
|
10
|
10
|
|
Water Supply Line (pressure)
|
10[1]
|
10[1]
|
|
Surface Waters (except wetlands)
|
25
|
50
|
|
Bordering Vegetated Wetland (BVW), Salt Marshes,
Inland and Coastal Banks
|
25
|
50
|
|
Surface Water Supply -
|
|
Reservoirs and Impoundments
|
400
|
400
|
|
Tributaries to Surface
|
|
Water Supplies
|
200
|
200
|
|
Wetlands bordering Surface Water Supply
|
|
or Tributary thereto
|
100
|
100
|
|
Certified Vernal Pools
|
50
|
100[2]
|
|
Private Water Supply Well or Suction
Line
|
50
|
100
|
|
Public Water Supply Well
|
(2)
|
(2)
|
|
Irrigation Well
|
10
|
25
|
|
Open, Surface or Subsurface Drains which discharge
to Surface Water Supplies or tributaries thereto
|
50
|
100
|
|
Other Open, Surface or Subsurface Drains
(excluding foundation drains) which intercept
seasonal high groundwater table [3]
|
25
|
50
|
|
Other Open, Surface or Subsurface Drains
(excluding foundation drains)
|
5
|
10
|
|
Leaching Catch Basins &
Dry Wells
|
10
|
25
|
|
Downhill Slope
|
not applicable
|
15[4]
|
[1] Disposal
facilities shall be at least 18 inches below water supply lines. Wherever sewer
lines must cross water supply lines, both pipes shall be constructed of class
150 pressure pipe and shall be pressure tested to assure
watertightness.
[2] The required
setback shall be 50 feet where the applicant has provided hydrogeologic data
acceptable to the Approving Authority demonstrating that the location of the
soil absorption system is hydraulically downgradient of the vernal pool.
Surface topography alone is not determinative.
[3] Surface or subsurface drains which will
regularly or periodically intercept the seasonal high groundwater table and
carry that groundwater away from an area must meet the specified
setbacks.
[4] The setback distance
shall be measured from a naturally-occurring downhill slope which is not
steeper than 3:1 (horizontal:vertical). A minimum 15 foot horizontal separation
distance shall be provided between the top of the two inch layer of 1/8 to
1/2 inch washed stone above the pipe, or the geotextile material above the
pipe or the top of the chamber and the adjacent downhill slope. For a system
located in an area with any adjacent naturally occurring downhill slope steeper
than 3:1, slope stabilization shall be provided in accordance with best
engineering practice which may include construction of a retaining wall
designed by a Massachusetts Registered Professional Engineer.
[5] Locating a system component or any part
thereof beyond a property line of the facility, whether pursuant to an easement
or otherwise, requires a variance issued in accordance with
310
CMR
15.410, except that the placement of fill
or grading material beyond the property line of the facility, pursuant to an
easement or otherwise, shall not require a variance under
310
CMR
15.410.
(2) No system shall be constructed within a
Zone I of a public water supply well or wellfield. No system shall be upgraded
or expanded within a Zone I of a public water supply well or wellfield unless a
variance is granted pursuant to
310
CMR
15.410 through
15.415.
(3) All setback distances from water bodies
shall be measured from the bank of the water body. All setback distances from
wetlands shall be measured in accordance with the criteria of the Wetlands
Protection Act and
310 CMR
10.00:
Wetlands Protection, from the
most landward edge of the following features: bordering vegetated wetland as
defined in
310
CMR
10.55(2):
Definition, Critical Characteristics and Boundary; salt marsh
as defined in
310
CMR
10.32(2):
Definitions; top of inland bank as defined in
310
CMR
10.54(2):
Definition, Critical Characteristics and Boundary; or top of
coastal bank as defined in
310
CMR
10.30(2):
Definition. In the event of disputes concerning landward
boundary of resources subject to the Wetlands Protection Act, the boundary
shall be as delineated by the municipal Conservation Commission or the
Department in accordance with
310 CMR
10.00:
Wetlands Protection, and
relevant interpretive guidance documents.
