Leaching Area Requirements1, 4, 6, 7, 8
| ||||
---|---|---|---|---|
Sidewall Area2, 9
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Percolation Rate
(minutes per inch)
|
Square Feet Per Gallon
|
Gallons Per Square Foot
|
Bottom Area3
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0.0 to 10.0
|
1.0
|
1.00
| ||
15.0
|
1.5
|
0.67
| ||
20.0
|
2.0
|
0.50
| ||
25.0
|
2.5
|
0.40
| ||
30.0
|
3.0
|
0.33
| ||
Over 30.05
|
Unsuitable
|
NOTES:
| |
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1 Leaching fields: see Article XV.
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2 Sidewall area is
the pervious vertical interface of the excavation for the leaching
facility below the invert elevation of the inlet, or the lowest invert
elevation of the distribution line.
| |
3 Bottom area will
not be considered as part of the leaching facility without prior approval
of the Board of Health.
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4 Systems for more
than 2,000 gallons per day shall not be installed where the percolation
rate is slower than 20 minutes per inch.
| |
5 Soil with a percolation
rate over 30 minutes per inch is considered impervious and, therefore,
unsuitable for the subsurface disposal of sewage.
| |
6 Garbage grinders
are not allowed.
| |
7 Sewage systems
to be constructed in fill must be designed according to the percolation
rate of the underlying original soil.
| |
8 See Illustrations
A and B (on file in the Town offices).
| |
9 Minimum allowable
square footage by the Southborough Board of Health is 450 square feet
of sidewall area only.
|
Distances1, 2
| ||||
---|---|---|---|---|
Component
|
Septic Tank
(feet)
|
Leaching Facility
(feet)
|
Building Sewer
(feet)
|
Privy
(feet)
|
Well or suction line
|
50
|
1001
|
—3
|
1001
|
Water supply line (pressure)
|
—4
|
—4
|
—4
|
—4
|
Property line
|
10
|
10
|
—
|
30
|
Cellar wall or in-ground swimming
pool
|
10
|
20
|
—
|
30
|
Surface water supplies (reservoirs
or tributaries to reservoirs), including open and subsurface drains
|
502, 5
|
1001, 2, 5
|
—5
|
1001, 2, 5
|
Watercourses
|
252, 5
|
502, 5
|
—
|
502, 5
|
Subsurface drains
|
25
|
25
|
—
|
25
|
Leaching catch basin or dry well
|
—
|
25
|
—
|
—
|
Downhill slope (measured from the
top of the leaching facility)
|
150 times the slope (expressed as
a fraction) (See Illustrations A, B, C, on file in Town offices.)
|
NOTES:
|
---|
1 One hundred
feet is a minimum acceptable distance, and no variance shall be grated
for a lesser distance, except with prior written approval of the Department
of Environmental Quality Engineering.
|
2 All distances
shall be measured from the average of the mean annual flood elevation
in inland areas and from mean high water in coastal areas.
|
3 Ten feet
if constructed of durable corrosion-resistant material with water
tight joints or 50 feet if any other type of pipe is used.
|
4 It is
suggested that the disposal facilities be installed at least 10 feet
from the 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 should be pressure tested to assure watertightness.
|
5 The applicant
should be aware of his obligation to comply with the requirements
of the Wetlands Protection Act. MGL c. 131, § 40.
|