Current through all regulations passed and filed through September 16, 2024
(A)
Tanks subject to
this chapter including, but not limited to. septic tanks, dosing tanks, pump
vaults. HSTS holding tanks and privy vaults, grease traps or other applicable
tanks shall be manufactured to be watertight and structurally sound in
accordance with division (A)(17) of section
3718.02 of the Revised
Code.
(B)
Except as otherwise specified in rule, tanks shall be
composed of materials, manufacture, physical design requirements and joint and
tank connections that are in accordance with one of the following:
(1)
ASTM C
1227;
(2)
IAPMO/ANSI Z1000; material property
standard;
(3)
CAN/CSA-B66;
(4)
ASTM Standard C
1613 for concrete grease interceptors; or
(5)
Other standards
approved by the director.
(C)
Septic tanks
used in a STS shall be labeled in accordance with ASTM C 1227, IAPMO/ANSI
Z1000. or CAN/CSA-B66 and shall comply with the following requirements and
specifications:
(1)
Minimum liquid capacities:
(a)
One to two
bedrooms - one thousand gallons in one or two compartments.
(b)
Three bedrooms -
one thousand five hundred gallons in two tanks or compartments.
(c)
Four to five
bedrooms - two thousand gallons in two tanks or compartments.
(d)
Six or more
bedrooms - two thousand five hundred gallons plus an additional two hundred
fifty gallons of tank capacity for each bedroom in two tanks or
compartments.
(e)
SFOSTS - one thousand gallons minimum in two tanks or
compartments with at least two and one-half times the daily design
flow.
(2)
In two compartment tanks, the first compartment shall
not be less than one half or more than two-thirds of the total capacity of the
septic tank and the transfer port in the center wall shall ensure transfer of
liquid from the clear zone only. When using two tanks, the septic tanks shall
be connected in series.
(3)
The septic tank outlet, or the outlet of the last
septic tank in series, shall include an effluent filter device that retains
solids greater than one sixteenth inch in size. Effluent filter devices shall
be certified to ANSI/NSF Standard 46 or be approved by the director. Effluent
filter devices shall be sized to meet the estimated daily design flow for the
system that the septic tank is used in.
(D)
Access openings,
watertight risers, and lids shall be installed above the inlet and outlet of
the tank in accordance with the following:
(1)
Access openings
and risers shall provide a minimum twelve inch clear opening and allow adequate
space for pumping of the tank and inspection and maintenance except for access
openings of pretreatment components as specified in paragraph (J) of rule
3701-29-13 of the Administrative
Code. Clear opening means the point at the smallest diameter within the access
opening.
(2)
The connection of the riser to the tank and the
connection of additional riser sections shall be watertight and prevent
vertical and lateral movement of the riser.
(3)
Riser joints
must be watertight and use a gasket and/or sealant.
(4)
Risers shall
extend either to grade or above grade in a manner to prevent infiltration of
surface or ground water.
(5)
The cover or riser lid shall weigh a minimum of fifty
pounds or be secured by mechanical means against unauthorized
access.
(E)
An access opening, watertight riser, and cover shall
be provided above the compartment wall with a minimum twelve inch clear opening
to allow for adequate pumping, inspection, and maintenance in a two compartment
tank unless the transfer port in the center wall is a pass through opening that
allows a shared liquid level in both compartments.
(F)
Tanks shall be
bedded, installed, and backfilled in accordance with manufacturer
specifications and the product approval to assure the structural strength
integrity of the tank. The tank shall be reasonably level to ensure the invert
of the tank outlet is lower than the invert of the tank inlet.
(G)
After
installation, the director or a board of health may require watertight field
testing of any STS tank due to installation or pipe connection problems
provided the testing is conducted in accordance with the manufacturer's field
testing procedures provided as part of the product approval.
(H)
One year after
the effective date of this rule, all tanks used in STS shall be approved by the
director. The department of health shall maintain a list of approved tank
models. A manufacturer's request submitted to the department of health for tank
approval shall include, but is not limited to:
(1)
A complete
application form as developed by the department of health;
(2)
Structural and
physical design information, including tank or component buoyancy calculations
and associated anti-buoyancy measures, design drawings and material
specifications for each model size and configuration to demonstrate compliance
with this rule;
(3)
Documentation of the total liquid capacity and tank
volumes calibrated in one inch increments for each tank;
(4)
A written
watertight field test procedure. Manufacturers of precast concrete tanks may
use the test procedure specified in ASTM C 1719;
(5)
Detailed written
installation instructions including but not limited to bedding and backfilling
requirements, product specific procedures to address buoyancy concerns with the
tank, and identification of all site and installation conditions where these
procedures are necessary;
(6)
Verification of tank structural strength and integrity
for expected internal and external loads by proof of compliance with one of the
following assurance review methods:
(a)
Process assurance review. Annual certification of the
manufacturer by the national precast concrete association. IAPMO research and
testing. CSA quality management institute, or other methods approved by the
director;
(b)
Product assurance review. Certification of compliance
with one of the following standards, as appropriate, by a registered
professional engineer or ANSI approved testing facility for each model of
septic tank:
(i)
ASTM C-1227 standard specifications for precast
concrete septic tanks. The product assurance review under ASTM C-1227 shall
include submission of results from structural proof testing which has been
witnessed and certified by a registered professional engineer. The structural
proof test shall consist of applying a negative air pressure (Vacuum) and/or
weight applied to the top of the tank to a determined load factor. For standard
tanks designed to be buried with one foot to four feet of earthen cover, the
calculated load factor requires that a tank be tested to a negative air
pressure of four inches plus the placing of two thousand pounds of weighted
material on a footprint of two feet by two feet placed in the center of the top
of the tank as shown in figure 1. The calculated load factor shall be three
hundred pounds per square foot lateral loads, and eight hundred pounds per
square foot of top loading. The tank shall be certified as being structurally
sound if it holds the pressure and weight for five minutes. The testing
performed under this provision is intended to only be performed in the
controlled environment of in-plant testing conforming to industry accepted test
procedures;
Figure 1.
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view image
(ii)
IAPMO/ANSI Z1000 standard for prefabricated septic
tanks:
(iii)
CAN/CSA-B66 for prefabricated septic tanks and sewage
holding tanks; or
(iv)
ASTM Standard C 1613 for concrete grease
interceptors;
(c)
Submission of written certification of tank designs or
drawings assuring structural strength and integrity for anticipated internal
and external loads by a registered professional engineer. Certification shall
include the reviewed designs and drawings and be stamped with the registered
professional engineer's seal.
(7)
Documentation
and verification of water-tightness testing by proof of compliance with one of
the following assurance review methods:
(a)
Process
assurance review. Annual certification of the manufacturer by the national
precast concrete association. IAPMO research and testing, CSA quality
management institute, or other methods approved by the
director.
(b)
Product assurance review. Certification of compliance
with one of the following standards, as appropriate, by a registered
professional engineer or ANSI approved testing facility for each model of
tank:
(i)
ASTM
C-1227 standard specifications for precast concrete septic tanks unless proven
under paragraph (H)(6)(b)(i) of this rule;
(ii)
IAPMO/ANSI
Z1000 property standard for prefabricated septic tanks;
(iii)
CAN/CSA-B66
for prefabricated septic tanks and sewage holding tanks; or
(iv)
ASTM Standard C
1613 for concrete grease interceptors.
(c)
Field assurance
review. Signed written certification provided by the manufacturer that all STS
tanks shall be field tested as watertight in accordance with either ASTM C-1719
for precast concrete tanks. IAPMO/ANSI Z1000 standard for prefabricated septic
tanks. CAN/CSA-B66 for prefabricated septic tanks and sewage holding tanks, or
other methods approved by the director and as appropriate for the material and
manufacture of the tank.
(8)
Identification
of methods for tank repair and/or replacement in the event of watertight test,
load or installation failure. Repairs of tanks shall be performed by the
manufacturer in a manner ensuring that the repaired tank will conform to the
requirements of these regulations.
(9)
Any additional
information as required by the director.
(I)
Unless there is
evidence of noncompliance with this rule and when there has been no change in
the design or materials used in the manufacture of the tank, the department of
health approval shall remain valid and a septic tank shall remain on the list
upon verification of the required proof of compliance within the time frame or
conditions of the assurance review method submitted by the manufacturer. When
there has been a change in design or materials or a change in the submitted
assurance review method, the manufacturer shall reapply in accordance with this
paragraph. If a manufacturer fails to maintain compliance with this rule the
department of health shall remove the septic tank model or the manufacturer
from the list of approved septic tanks in accordance with Chapter 119. of the
Revised Code.
(J)
Dosing tanks shall be designed and manufactured in
accordance with the following:
(1)
Dosing tanks shall comply with the standards and
specifications of this rule.
(2)
Dosing tanks
shall be selected to accommodate the volume below maximum drawdown, the maximum
design dose including any drainback. and the design portion of the reserve and
surge capacities as applicable. For the purposes of this chapter, reserve
capacity shall be the tank capacity above alarm activation level.
(a)
STS with time or
demand dosed designs shall provide a reserve capacity for high water alarm
events that is not less than one-half of the daily design flow.
(b)
STS with time
dosed designs shall accommodate combined reserve and surge capacities of not
less than one hundred fifty per cent of the peak daily design flow. For the
purposes of this chapter surge capacity shall be the tank volume between the
high water alarm level and the maximum drawdown point level.
(c)
When required by
the manufacturer, the volume below maximum drawdown shall be sufficient so that
the pump will remain submerged after a dosing event. For the purposes of this
chapter volume below maximum drawdown shall be the volume below the pump off
setting. A redundant off switch may be installed to prevent pumping below the
design maximum drawdown point.
(3)
A septic tank
second compartment or a second septic tank in series may be used for low volume
dosing if all conditions cited above are met and a filtered step system or
screened vault is used in lieu of, or in addition to, the effluent filter
device required.
(K)
Effluent dosing
pumps shall meet the following specifications:
(1)
A pump shall be
rated for effluent service by the manufacturer and must be third party or
listed to the appropriate UL or CSA standard.
(2)
The pump shall
be properly sized to meet the design flow rate and total dynamic head
requirements specified for the STS. The STS design shall include a graph of the
pump curve showing that the pump can meet the design requirements of the
network by calculation.
(3)
A quick disconnect shall be accessible in the pump
discharge piping with adequate lift attachments provided for removal and
replacement of the pump and water level control assembly without having to
either enter the dosing tank or pump the tank to lower the liquid level. When a
check valve is used, a vent hole should be installed between the check valve
and pump to prevent pump airlock.
(4)
If any portion
of the pump fittings or transport line is at a higher elevation than the soil
absorption component, the system must be equipped with an air vacuum release
valve or other suitable device to avoid siphoning.
(5)
Replacement
pumps and controls must meet the original design standards and
criteria.
(L)
A dosing siphon or other similar device may be used if
the STS design requirements, including the design flow rate, dose capacity, and
low pressure distribution parameters, can be met and
maintained.
(M)
Switches, controls, alarms, and electrical devices
shall be listed to the appropriate UL or CSA standards, clearly and permanently
labeled by the manufacturer and/or per the approved design, acceptable for the
design, installed in a manner easily accessible for routine monitoring and
maintenance, and shall comply with the following:
(1)
Float switches,
when used, must be mounted independent of the pump and transport line so that
they can easily be removed from the dosing tank without disturbing or removing
the pump;
(2)
Except as required in paragraph (A)(5) of rule
3701-29-15.1 of the
Administrative Code, controls associated with dosing of effluent shall provide
a means to record dosing events or the ability to collect information to
troubleshoot system malfunctions;
(3)
Controls shall
have both audible and visual alarms. Alarms and controls shall be on a commonly
used household circuit. All other electrical components shall be on a different
dedicated circuit than the alarms and controls. The board of health may require
that the alarm be located in closer proximity to the dwelling or structure when
the STS location is remote;
(4)
Control panels
and alarms shall be mounted in an easily accessible exterior location, a
minimum of one foot above grade to bottom of lowest junction box and shall be
field-tested to assure compliance with the STS specifications, and shall
include written instructions related to standard operation and alarm events;
and
(5)
Failsafe shut-off mechanisms shall be required and
installed for discharging off-lot systems under the household general NPDES
permit and shall meet the requirements of the director's
approval.
(N)
The board of health may require an electrical
inspection to address concerns of safety or risk of injury.
(O)
STS components
described in this rule shall be installed, operated and maintained as specified
by the manufacturer and the approved design.
(P)
Except where gray
water discharges to an approved GWRS via a separate building sewer, or approved
alternative toilets are used, building sewers shall carry all sewage flow from
the dwelling or structure, including gray water or other segregated sewage, and
shall be connected to a STS in compliance with this chapter. Building sewers
shall comply with the following:
(1)
The elevation of a building sewer shall be aligned to
accommodate the plan elevations of the subsequent STS components at a uniform
grade of not less than one per cent or one eighth of an inch per foot. Designs
should avoid sewer line slopes greater than ten per cent. The sewer shall be
properly bedded in in situ soil or coarse aggregate that minimizes
settling;
(2)
A building sewer shall be watertight, have a minimum
diameter of four inches, be Schedule 40 or SDR 21 or greater, and be
constructed of durable material conforming to ASTM D2661 or ASTM D1527 for ABS
plastic pipe or ASTM D1785. ASTM D2729. or ASTM D2665 for PVC plastic pipe.
Pipe-fittings, and joining materials shall be chemically and physically
compatible and ensure water-tightness; and
(3)
No pipe elbows
greater than forty five degrees are permitted.
(Q)
A building sewer
shall allow for proper venting of STS components. Traps shall not be installed
in a building sewer.
(R)
A cleanout shall be required outside each structure
served by a STS when one is not provided inside the structure. Additional
cleanouts shall be required in a building sewer at the point a building sewer
pipe exceeds seventy-five feet and at every one hundred foot interval
thereafter.
(S)
Casing or other form of protection shall be provided
for any portion of a building sewer located in areas where soil or
environmental conditions exist that could cause excessive additional loads on
the sewer including vehicle traffic or excavation in or through disturbed or
excavated soils.
Replaces: 3701-29-07, 3701-29-16
