Minnesota Administrative Rules
Agency 167 - Pollution Control Agency
Chapter 7081 - MIDSIZED SUBSURFACE SEWAGE TREATMENT SYSTEMS
Part 7081.0040 - STATE REGULATION
Universal Citation: MN Rules 7081.0040
Current through Register Vol. 49, No. 13, September 23, 2024
Subpart 1. Agency regulation.
A. All MSTS
must be designed and operated according to this chapter, except as modified
through an ordinance in compliance with chapter 7082 and Minnesota Statutes,
section
115.55.
All MSTS must be designed, installed, inspected, pumped, and operated by a
qualified employee under part
7083.1010 or a licensed business
under part
7083.0710. All MSTS must conform
to applicable state statutes and rules.
B. The owner or owners of an SSTS must obtain
an SDS permit from the agency according to chapter 7001 when:
(1) a single proposed or existing soil
dispersal area receives a fow greater than 10,000 gallons per day; or
(2) when all proposed and existing SSTS soil
dispersal areas that are under common ownership and within one-half mile of
each other have a combined fow greater than 10,000 gallons per day. Flow from
an SSTS with low impact to potable water is not counted in this
subitem.
C. An SDS
permit is required for any subsurface sewage treatment system or group of
subsurface sewage treatment systems that the commissioner determines has the
potential or an increased potential to cause adverse public health or
environmental impacts if not regulated under a state permit. Conditions for
these permits include systems in environmentally sensitive areas,
unsubstantiated or unexpected flow volumes, and systems requiring exceptional
operation, monitoring, and management.
D. If fow values, as determined according to
part 7081.0110, are greater than 10,000
gallons per day but an SDS permit is not required because of subpart
1a, item B, fow measurement
data generated for making that determination must be submitted to the
commissioner for review before a local permit is issued. Information on all
subsequent alterations to the fow must also be provided to the
commissioner.
Subp. 1a. Flow determination.
The owner or owner's agent must determine fow according to this subpart to establish whether an SDS permit is required under subpart 1, item B.
A. For new SSTS and expansions to existing
SSTS, the fow must be determined according to item C.
B. For existing SSTS, except as provided
under item D, the fow is determined:
(1) by
calculating the average of the maximum measured daily fow for a consecutive
seven-day period when the following measurements are recorded and used in the
calculation:
(a) 90 consecutive daily fow
measurements capturing the maximum use. Measurements must be corrected for
occupancy or use according to Prescriptive Designs and Design Guidance for
Advanced Designers, incorporated by reference under part
7080.1550, subpart
2; and
(b) 40 additional, consecutive, weekly fow
measurements validating that unit (a) captured the maximum use; or
(2) according to item C.
C. When determined
according to this item, flow is calculated according to part
7081.0110. The highest calculated
value of the various methods in Table I under part
7081.0130, subpart
1, must be used to make the
determination, with no reduction allowed. An SDS permit is not required if a
factor of safety is added to the design flow that results in a design flow that
exceeds the SDS permit threshold.
D. Campgrounds and resorts existing as of
June 14, 2015, that are open 180 days per year or less must determine flow in
accordance with this item or item A or B.
(1)
Flow measurements must be taken only from:
(a) a sewage lift station pump with a runtime
meter and counter;
(b) a sewage
flow meter;
(c) flow meters on
wells; or
(d) a water softener
system with flow measurement when the measurement includes all flow to the
subsurface soil treatment system, including backwash.
(2) Flow measurement devices must be
calibrated before start-up of monitoring and must undergo an additional
calibration during the measurement period to verify results.
(3) The daily flow rate and daily occupancy
rate must be recorded for a minimum of two weeks centered on and including July
4. Weekly measurements must also be done for an additional, continuous two
weeks before and two weeks after July 4.
(4) Flow measurements must be divided by the
percent occupancy expressed as a decimal percent.
(5) Flow extrapolation from systems not
measured is allowed as follows:
(a) flow may
be extrapolated only if fewer than 25 percent of the systems are not
measured;
(b) the systems measured
must serve at least 75 percent of the occupancy of the campground or resort;
and
(c) flow extrapolation is not
allowed between other campgrounds and resorts.
(6) If no flow data exist, the owner or
operator of the campground or resort must implement an acceptable flow
measurement plan and start measuring and recording flow data within 120 days of
notification. An acceptable flow measurement plan is a plan, verified by the
agency, conforming to subitems (1) to (5).
(7) All flow measurement data generated from
the flow measurement plan must be submitted to the commissioner within 30 days
of the last measurement.
Subp. 2. Other state regulations.
A. MSTS must conform to
all applicable state statutes and rules.
B. MSTS serving establishments licensed or
regulated by the state of Minnesota, or MSTS owned by the state of Minnesota,
must conform to this chapter.
Statutory Authority: MS s 115.03; 115.55
Disclaimer: These regulations may not be the most recent version. Minnesota may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
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