HomeMy WebLinkAbout310 CMR: DEP - 12.27.1996 - Miscellaneous - 345 BOSTON STREET 8/13/2019 310 CMR: DEPARTMENT OF ENVIRONMENTAL PROTECTION
15.253: continued
(5) Two or more chambers or galleries connected in series shall constitute a chamber or
gallery system. The application of 310 CMR 15.253(1 xc)(pits separation distances)shall
be applied to adjacent chamber or gallery systems as a unit rather than to the individually
connected chambers or galleries.
(6) Inlets to chamber and gallery systems installed in trench configuration shall be provided
at intervals not to exceed 20 feet.Chamber or gallery systems in bed configuration shall be
provided with at least one inlet for every 40-foot square section.
15.254: Dosine
(1) Gravity Distribution.
(a) Dosing systems employing gravity distribution to the soil absorption system shall be
restricted to systems designed to accept less than 2,000 gpd.
(b) The dosing chamber and pumps shall be designed in accordance with 310 CMR
15,231.
(c) Distribution lines to the soil absorption system shall have a minimum diameter of two
inches and shall otherwise be in conformance with the provisions of 310 CMR 15.251
(Trenches).
(d) Septic tank effluent shall be dosed to the soil absorption system based on the system
design flow in accordance with the following frequency:
Soil Type Dosing Frequency
Sands,Loamy Sands 4 Doses Per Day
Sandy Loam,Loams 1 Dose Per Day
Silt Loam 1 Dose Per Day
Clays,Silty Clay Loams 1 Dose Per Day
(2) Pressure Distribution.
(a) Pressure distribution of septic tank/recirculating sand filter effluent to the soil
absorption system shall be required for all system designs in excess of 2,000 gpd.
(b) The dosing chamber and pumps shall be designed in accordance with 310 CMR
15.231.
(c) The pressure distribution system shall be designed in accordance with the procedures
set forth in Department guidance.
(d) Pumps,alarms and other equipment requiring periodic or routine inspection and
maintenance shall be operated,inspected and maintained in strict accordance with the
manufacturer's specifications.In no instance shall inspection be performed less frequently
than once every three months. The results of such inspections shall be submitted to the
approving authority.
15 255: Construction in Fill
(1) Any system where fill is required to replace topsoil,subsoil,peat or other unsuitable or
impervious soil layer above the requisite four feet of naturally occurring pervious material
shall be considered as a system constructed in fill. Any system constructed in fill which
extends either wholly or partially above natural grade for the purpose of complying with 310
CMR 15.212 (depth to groundwater) is a mounded system. All soil absorption systems
constructed in fill shall be sized using the soil type of the underlying naturally pervious
material.
(2) The finished side slopes of a mounded system shall not be steeper than 3:1
(horizontal:vertical). A minimum 15 foot horizontal separation distance shall be provided
between the soil absorption area and the adjacent side slope as measured from the edge of the
top of the two inch layer of'A to'/z inch washed stone aggregate cover. The toe of the slope
shall be a minimum of five feet from any adjacent property line;or a swale or other drainage
system directing runoff away from the adjacent property shall be installed. Adjustments to
the above side slopes may be allowed if a suitable impervious barrier(such as a vertical
concrete retaining wall constructed in accordance with 310 CMR 15.255(2))is installed to
mitigate potential sewage breakout.
12/27/96 310 CMR-530
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310 CMR: DEPARTMENT OF ENVIRONMENTAL PROTECTION
15.255: continued
(a) The retaining wall shall be constructed of reinforced concrete,shall have no weep
holes,and shall be waterproof.
(b) The retaining wall shall be designed by a Registered Professional Engineer,who shall
certify that the above condition is met by the submitted design.
(c) The upgradient side of the retaining wall shall be waterproofed.
(d) Construction of the retaining wall shall be supervised by the design engineer.
(e) An as-built plan shall be prepared and certified by the design engineer that the wall
has been constructed in accordance with his approved design plan.
(f) The elevation of the top of the retaining wall shall be no lower than the"breakout"
elevation,which is the elevation of the top of the two inch layer of'A inch to inch
washed stone aggregate cover.
(g) The distance from the wall to the edge of the leaching area should be at least ten feet.
(3) Fill material for systems constructed in fill shall consist of select on-site or imported soil
material. The fill shall be comprised of clean granular sand,free from organic matter and
deleterious substances. Mixtures and layers of different classes of soil shall not be used. The
fill shall not contain any material larger than two inches.A sieve analysis,using a#4 sieve,
shall be performed on a representative sample of the fill.Up to 45%by weight of the fill
sample may be retained on the #4 sieve. Sieve analyses also shall be performed on the
fraction of the fill sample passing the #4 sieve, such analyses must demonstrate that the
material meets each of the following specifications:
SIEVE SIZE EFFECTIVE %THAT MUST
PARTICLE SIZE PASS SIEVE
# 4 4.75 mm 100%
#50 0.30 mm 10%- 100%
#100 0.15 mm 0%- 20%
#200 0.075 mm 0%- 5%
A plot of the sieve analyses of the portion of the sample passing the#4 sieve shall fall on or
between the lines on the following graph:
PARTICLE SIZE_DISTRIBUTION
#200 #100 #50 #4 Sieve Size
100
90
a r
W
70
z
Q P
d �
F-
!
z 40
w
30 i
20
t
10
0
Micron 60 200 600 2 6 10 mm
12/27/96 310 CMR-531
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