Current through Register Vol. 48, No. 39, March 25, 2024
Subpart 1.
Tank abandonment.
All systems with no future intent for use must be abandoned
according to this part. Tank abandonment procedures for sewage tanks,
cesspools, leaching pits, drywells, seepage pits, vault privies, and pit
privies must meet the requirements in items A to C.
A. All solids and liquids must be removed and
disposed of according to part
7080.2450, subpart 6, by a
licensed maintenance business.
B.
All electrical devices and devices containing mercury must be removed and
disposed of according to applicable regulations.
C. Abandoned tanks or any other underground
cavities must be removed or remain in place and crushed with the remaining
cavity filled with soil or rock material.
Subp. 2.
Future discharge.
Access for future discharge to the system must be permanently
denied.
Subp. 3.
Removal of system.
If soil treatment and dispersal systems are removed,
contaminated materials shall be properly handled to prevent human contact.
Contaminated materials include distribution media, soil or sand within three
feet of the system bottom, distribution pipes, tanks, and contaminated soil
around leaky tanks. Contaminated material also includes any soil that received
sewage from a surface failure. Contaminated materials must be disposed of
according to items A to D.
A.
Contaminated materials disposed of off-site must be disposed of according to
part
7080.2450, subpart 6.
B. If contaminated material is to be spread
or used on-site within one year of contact with sewage, the material must be
placed in an area meeting the soil and setback requirements described in part
7080.2150, subparts
2, item F, Table VII, and 3,
item C, and the material must be covered with a minimum of six inches of
uncontaminated soil and protected from erosion. After one year following
contact with sewage, the material is allowed to be spread in any location
meeting the setback requirement of part
4725.4450, covered with a minimum
of six inches of uncontaminated soil, and protected from erosion. After one
year following contact with sewage, the material is allowed to be used to fill
in the abandoned in-place sewage tanks.
C. Contaminated pipe, geotextile fabric, or
other material must be dried and disposed of in a mixed municipal solid waste
landfill.
D. The person or business
abandoning the system must complete and sign a record of abandonment that
states the system was abandoned according to this part. The record must be sent
to the local unit of government within 90 days of abandonment.
Statutory Authority: MS s
115.03;
115.55
