Minn. R. Part 7080.2000 - LOCATION AND INSTALLATION OF TANKS
A. Sewage tanks must not be placed in areas
that prohibit the removal of solids and liquids from the tank according to part
7080.2450.
B. Sewage tanks must be set back as specified
in Table VII in part
7080.2150, subpart 2, item
F.
C. The top of sewage tanks must
not be buried deeper than four feet from final grade for new dwellings, unless
a local ordinance allows for burial at a greater depth, not to exceed the tank
manufacturer's maximum designed depth for the tank. The minimum depth of soil
cover over the insulation on the top of the tank is six inches.
D. Sewage tanks must not be placed in
floodways, drainageways, or swales. Upslope drainage must be diverted away from
the location of all tanks. A tank's final cover must be crowned or sloped to
shed surface water.
E. Sewage tanks
must not be placed in areas subject to vehicular traffic unless engineered for
the anticipated load.
F. Sewage
tanks must be placed on firm and evenly compacted soil and with the soil level
in all directions. The bottom shall be excavated in a manner so the vertical
load is borne by the tank walls and not the tank bottom. If the bottom of the
tank excavation contains rocks, bedding material must be used according to
manufacturer's instructions. The soil beneath the tank must be capable of
bearing the weight of the tank and its contents.
G. Sewage tanks and risers must be installed
according to manufacturer's requirements and in a structurally sound and
watertight fashion.
H. If the top
of a sewage tank is to be less than two feet from final grade, the lid of the
tank must be insulated to an R-value of ten. Maintenance hole covers must be
insulated to an R-value of ten. All insulating materials must be resistant to
water absorption.
I. Sewage tanks
placed below the level of the periodically saturated soil must employ a method
to protect against flotation under periodic saturated soil conditions when the
tank is empty.
J. Connections
between the concrete tank and the building sewer or supply pipe must meet the
requirements of American Society for Testing and Materials, Standard
Specification for Resilient Connectors Between Reinforced Concrete Manhole
Structures, Pipes, and Laterals, ASTM C923 (2002), or equivalent. The standard
is incorporated by reference, is available through the Minitex interlibrary
loan system, and is not subject to frequent change.
K. Joints of concrete tanks, concrete tank
lids, and concrete risers must be sealed using a bonding compound that meets
American Society for Testing and Materials, Standard Specification for Joints
for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible
Joint Sealants, ASTM C990 (2003). The standard is incorporated by reference, is
available through the Minitex interlibrary loan system, and is not subject to
frequent change.
Notes
Statutory Authority: MS s 115.03; 115.55
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