Current through all regulations passed and filed through September 16, 2024
(A)
The owner or
owner's agent shall provide information to the board of health and/or the
system designer on the sources of sewage from the dwelling or structures to be
served by a STS to document system design flow and waste strength in accordance
with these rules. The board of health may require submission of building and
plumbing plans including plumbing fixture details and other information as
needed.
(B)
The daily design flow estimate for a STS shall comply
with the following general provisions unless otherwise specified:
(1)
Except as
provided in paragraphs (B)(4) and (B)(5) of this rule, the daily design flow
for a HSTS shall be one hundred twenty gallons per day per bedroom with a
minimum design flow of two hundred forty gallons per day.
(2)
For a SFOSTS
with periodic large daily flow, effluent may be stored to avoid exceeding the
one thousand gallon per day treatment limit provided the peak design flow does
not exceed three thousand five hundred gallons per day. When effluent is stored
to avoid exceeding the one thousand gallon per day treatment limit, the design
shall use time dosing and the appropriate tank capacity to store effluent
during peak flows.
(3)
The daily design flow for a SFOSTS shall be determined
in accordance with table A-1 of rule
3745-42-05 of the Administrative
Code or alternative daily design flow as establised by the director of health.
The board of health may consider flow monitoring data in addition to or in
place of the minimum design flow requirement in table A-1. If flow monitoring
is used as the method of determining daily design flows, then daily design flow
shall be at least one and a half to two times the measured average daily
flows.
(4)
An increase in the daily design flow estimate for a
STS shall be required by the board of health when there is an indication that
the flows established in accordance with paragraph (B)(1) or (B)(2) of this
rule may be exceeded. Any required increase in daily design flow shall be
documented on the installation permit and operation permit.
(5)
A reduction in
daily design flow for a STS may be approved by the board of health when
information submitted indicates conditions that justify reduced flow such as
low-flow fixtures, alternative toilets, or other circumstances that may warrant
a reduction in daily design flow. Justification for a proposed reduction in
daily design flow shall be included in the site review application and, if
approved, shall be documented on the installation permit and operation permit.
When actions are taken to reduce the flow to a STS. the design shall address
increased waste strength due to the reduced flows.
(C)
The waste
strength estimate for a STS shall be determined for design purposes. Waste
strength for sewage received by a HSTS shall be considered typical residential
sewage strength when, after primary treatment, the waste strength does not
regularly exceed the TSS content of three hundred thirty milligrams per liter,
the BOD5 content of two hundred fifty milligrams per
liter, or the fats, oils, and grease content of twenty five milligrams per
liter. Waste strength estimates for SFOSTS shall be determined from the waste
strength ranges in table A-1 of rule
3745-42-05 of the Administrative
Code.
(D)
Any waste prohibited by UIC regulations for
introduction into a SFOSTS shall be source separated and regulated by Ohio
EPA.
(E)
When the waste strength for a STS is expected to
exceed or has exceeded the typical residential sewage strength:
(1)
The use of
additional treatment components that are approved by the director of health
shall be included in the STS design prior to soil treatment and/or dispersal or
a pretreatment component approved by the director for meeting specified
effluent quality standards. The method of treatment to reduce waste strength
shall be justified in the design, reviewed by the board of health for
compliance with this chapter, and if approved, shall be documented on the
installation permit and operation permit.
(2)
Alternative soil
loading rate values that vary from these rules may be used to address concerns
of increased CBOD5
loading
from a STS. These alternative soil loading rates shall be documented and
justified in the design including waste strength characterization information.
Board of health approval for any increase in loading estimates shall be
documented on the installation permit and operation permit.
(F)
A
grease interceptor or automatic grease removal devices located inside buildings
shall meet the requirements of rule
4101:3-10-01 of the
Administrative Code. A sewage tank approved under rule
3701-29-12 of the Administrative
Code may be used as an external gravity grease interceptor to reduce fats, oils
and grease loading from a STS. The external grease interceptor shall be
located, designed, and installed in a manner that will allow access for
inspection and maintenance, including the following:
(1)
A source
segregated inlet line, when feasible:
(2)
The tank shall
be sized to allow for a minimum of thirty minutes of retention time based on
the peak flow from fixtures contributing fats, oils and grease:
and
(3)
Watertight access risers extended to grade with secure
covers.
(G)
Removal of a garbage disposal may be used to address
concerns of increased nutrient, total suspended solids, and biochemical oxygen
demand loading and concerns with an increased frequency of septage
removal.
Replaces: 3701-29-08,3701-29-21
