Current through all regulations passed and filed through March 18, 2024
Wells used as private water systems shall be constructed to
comply with the requirements of this rule.
(A) During the construction, alteration or
maintenance of a well, steps must be taken by the owner and the private water
systems contractor to minimize the entrance of contaminants into the well.
(1) If construction of the private water
system is not complete and the private water systems contractor must leave the
well site while the equipment is still on site, the contractor shall ensure
that the annular space or borehole is securely covered to prevent the entrance
of contaminants, and prevent a safety hazard for animals and people.
(2) If the drilling rig is to be removed from
the site before the installation of casing and grout, the borehole shall be
secured to prevent collapse or shall be sealed.
(3) Open boreholes without casing, grouting
and a proper cap installed shall not be left open for more than ten days unless
the private water systems contractor documents to the local health district
that extenuating circumstances including, but not limited to, equipment repair
delays or illness are preventing the completion of the well.
(B) Drive points shall only be
used to construct a well when geologic conditions or
site conditions preclude the use of or access
by conventional drilling equipment and
methods, such as cable tool, driven casing hammer, and air and mud rotary.
(1)
Additional plans
shall be submitted for drive point well construction indicating justification
for the installation of a drive point well in accordance with paragraph (G)(6)
of rule
3701-28-03
of the Administrative Code.
(2)
The local board
of health shall review the site prior to construction to confirm that a drive
point is the only possible method for use on the site.
(3)
For purposes of
this rule drive point means a small diameter well less than three inches in
diameter that is installed by manually or mechanically driving the casing into
the ground.
(4)
Drive points shall not be constructed on an emergency
basis.
(5)
The user shall have test strips or test kits to
prescreen for nitrates and chlorides.
(6)
The private water
system shall have a legible label placed on the pressure tank or near the
system which contains language provided by the department describing the
process of and providing recommendations regarding prescreening and testing for
nitrates and chlorides. It shall be the responsibility of the installing
private water system contractor to ensure that the tanks and components are
properly labeled.
(C) A well shall contain permanent primary
casing, and secondary permanent casing, if necessary, that meets the
requirements of rule
3701-28-09
of the Administrative Code.
(1) Except when
drive points are used in accordance with paragraph (B) of this rule and as
provided in this paragraph, the nominal pipe size of permanent primary casing
shall be a minimum of five inches and sized to allow the well to produce water
that is adequate for the intended use, and to allow for the installation and
maintenance of the well and related pumping equipment.
(2) The casing shall be installed
sufficiently straight and vertical and centered within the borehole.
(3) All primary and secondary casing and
casing joints shall be watertight.
(4)
Except when geologic
or hydrogeologic conditions require additional casing construction
requirements, casing shall extend continuously to the top of the aquifer
being used for water supply or be firmly seated or
extend into
the
competent solid, non-weathered, non-water bearing
bedrock
formation
above
the
uppermost aquifer being used for water supply.
(5) Primary casing installed into
consolidated formations shall be adequately seated in a competent geologic
formation.
(6) Casing shall not
extend less than twenty-five feet below the natural or original ground surface
except for where geologic and hydro geologic conditions indicate potable
water is not present at depths greater than twenty-five feet.
(a) Private water systems contractors shall
notify the local board of health within ten
business days
when less than twenty-five feet of casing has been installed in a
well.
(b) Under no conditions shall
casing for a well extend to a depth of less than ten feet.
(c)
Except for drive
points,
wells with less than twenty-five feet of casing and no
less than fifteen feet of casing shall require continuous disinfection in
accordance with rule
3701-28-15
of the Administrative Code.
(d) Wells with
less than fifteen feet of casing shall require continuous disinfection and cyst
reduction in accordance with rule
3701-28-15
of the Administrative Code. A variance to this rule by the board of health
shall not be permitted.
(D) In addition to the
requirements of paragraph (C) of this rule, if non-potable
water is encountered:
(1) Above an aquifer containing potable water, the
casing shall extend to the bottom of the aquifer containing the
non-potable water, or as deep as necessary to prevent
the non-potable water from entering the aquifer containing
potable water;
(2) Below an aquifer containing potable water, the
lower portion of the well shall be filled with cement grout or bentonite grout,
to a height sufficient to prevent entrance of non-potable
water into the aquifer containing potable water.
(E)
In addition
to the requirements of paragraph (C) of this rule, wells completed where
multiple aquifers are present shall have the casing extend through aquifers
that are not contributing to the water supply of the well. The annular space
contiguous to aquifers that are not contributing to the water supply of the
well shall be grouted in accordance with rule 3701-28-10 of the
Administrative Code.
(F)
Except for
flowing wells meeting the conditions of paragraph (P) of this rule, in addition
to the requirements of paragraph (C) of this rule, wells completed in
confined aquifers shall meet one of the
following:
(1)
Aquifers confined
by an unconsolidated confining layer shall have the casing extend through
the confining layer to the top of the aquifer. The annular space contiguous to
the confining formation shall be filled with cement grout or bentonite grout by
pressure grouting, dry driving, or dry pouring.
Filter packs and formation stabilizers shall not extend significantly into a
confining formation or allow interconnection of two separate aquifers along the
annular space.
(2)
Aquifers confined by a consolidated confining layer
shall have the casing extend a sufficient depth into the confining layer to
retain and maintain the natural ability of the confining layer to protect the
confined aquifer from contamination and prevent the loss of hydraulic head. The
annular space contiguous to the confining formation shall be filled with cement
grout or bentonite grout by pressure grouting, dry driving, or dry pouring. An
under reaming tool shall not be used with the dry driven grout
method.
(G) Except for very
soft, friable or weathered shales or sandstones, where consolidated formations
are encountered within twenty-five feet of the ground surface, an oversized
borehole shall be drilled and the annular space shall be filled with cement
grout or bentonite grout.
(H) Liner pipe may be
installed, or shall be installed if the consolidated
formation is determined to be prone to collapse, incompetent, or
weathered, within and below permanent primary and secondary casing and
must meet the requirements of paragraph (B) of rule
3701-28-09
of the Administrative Code and the following requirements:
(1) The top of the liner pipe must terminate
no deeper than twenty-one feet or above the static water level, whichever
is less, but no less than five feet below the ground surface
, must have a threaded connection to facilitate removal of
the liner, and must be able to be removed from the well to allow for well
cleaning, inspection and maintenance.
(2) Liner pipe with slots, drill holes or
other perforations may only be installed adjacent to consolidated geologic
formations to help prevent borehole collapse or protect the pumping equipment.
Liner pipe with slots, drill holes or other perforations may not be used as
well screens in unconsolidated geologic formation.
(I)
All annular spaces shall be grouted in accordance with the following
requirements:
(1) Except as otherwise provided
in paragraphs (D) and (M) of this rule, the annular space in all wells shall
be filled with grout from the bottom of the annular space or top of the filter
pack or formation stabilizer upward to the ground surface. The annular space
must be uniform and borehole stability must be maintained to ensure relatively
even placement of the grout seal.
(2)
Except for
flowing artesian conditions,
all drilling fluids shall be flushed from the annular
space prior to grouting.
(3) Except
as otherwise provided in paragraph (D) of this
rule and where multiple screens are present in the well, grout shall extend
continuously along the length of the permanent primary or secondary
casing.
(4) The annular space
between a permanent casing and temporary casing shall be filled with grout
during temporary casing removal.
(5) If the primary casing is not driven and
the drilling method requires the drilling of an oversized borehole:
(a) The total annular space shall be a
minimum of 1.5
inches per side for wells less than or equal to fourteen inches in diameter as
measured from the outside of the casing, or a minimum of one inch per side if
measured from the outside of the casing coupling,
(b) A minimum of two inches per side for
wells greater than fourteen inches in diameter, and a minimum of one inch per
side from the outside diameter of secondary casing.
(c) For wells exceeding twenty inches in
diameter, the annular space shall be no greater than six inches per side or
twelve inches total for wells less than or equal to thirty feet in depth, and
shall be no greater than four inches per side or eight inches total for wells
greater than thirty feet in depth.
(d) For purposes of this rule, the annular
space is the distance between the side of the borehole excavation and the
outside of the casing or joint coupling or the outside diameter of the casing
where no coupling is used.
(6) Except for the dry driven grout method,
the total volume of sealing materials used must not be less than eighty per
cent of the total volume of the annular space. If settling of the grout occurs,
then additional grout shall be placed into the remaining void space.
(7) Small diameter casing extensions for
large diameter wells using fiberglass casing with a buried seal shall not be
required to be grouted along the length of the smaller diameter casing. Grout
shall be placed from six inches above to six inches below the joint between the
smaller and larger diameter casing. The annular space adjacent to the small
diameter casing shall be filled with clean clay.
(8) Where the annular space in a borehole is
consistently dry, consideration must be given to the appropriate type of grout
materials used.
(J) Pressure grouting
using bentonite or cement grout slurries approved for use under rule
3701-28-09
of the Administrative Code shall be placed into the annular space in accordance
with the following requirements:
(1) When
grouting with the same materials, the grout shall be placed in the annular
space in a continuous operation without interruption until the cement or
bentonite grout of approximately the same density as the grout being placed
into the borehole is coming out of the annular space.
(2) When a tremie or conductor pipe is used
in pressure grouting operations it shall be of sufficient diameter, strength
and pressure rating to transport the density of grout being pumped to the depth
needed to ensure complete grouting of the annular space, and minimize damage to
the borehole walls and casing. For wells with grouting placed less than
one-hundred feet in depth, the tremie pipe may be left in place during the
grouting process and after grouting has been completed, provided the tremie
pipe is also filled with grout. Except when grouting flowing wells, for wells
with grouting placed greater than one-hundred feet in depth, the tremie pipe
shall be raised with each successive batch of grout placement with the tremie
pipe kept submerged a minimum of ten feet beneath the grouting surface in the
annular space at all times.
(3)
Except when a gravel pack is to be placed next to a
well screen,
a minimum of two shale traps shall be installed
prior to installation of the
casing and pressure grouting for installation of casing up to two hundred
feet in depth. One additional shale trap shall be installed for each additional
one hundred feet, or part thereof, of casing installed.
(a) The shale traps shall be placed such that
the bottom of the first shale trap is no more than
twelve inches from the bottom of the casing and that the bottom of the
subsequent shale traps
are no more
than twelve inches above the shale trap below it.
(b) Shale traps may be filled with granular
or coarse grade bentonite prior to placement in the borehole.
(c) Alternatively, casing may be placed
directly into a two-inch annular space per side
without a shale trap if the casing is resting on a consolidated formation
ledge, and a minimum of ten feet of coarse grade bentonite is placed
using the dry pouring method of placement described in
paragraph (H) of rule
3701-28-09
of the Administrative Code from the bottom of the casing upward in the
borehole, with any approved grouting method used to fill the remainder of the
annular space.
(4) Acid
soluble cellulose fiber or other similar
additives approved by the department may be added
to the grout slurry to minimize fluid loss in the borehole.
(K)
The conductor pipe gravity method may be used for cement grouts in accordance
with the following requirements:
(1) Cement
grout may be placed into the annular space of a well using the conductor pipe
gravity method where the annular space is greater than or equal to two inches
per side, no greater than one hundred feet in depth, and where there is a
minimal amount of water in the borehole. For purposes of this rule, the
"conductor pipe gravity" method means allowing cement to flow by gravity
through a funnel or hopper connected to a conductor pipe.
(2) The conductor pipe shall be lowered to
the bottom of the annular space to be grouted and the grout placed from the
bottom up with the conductor pipe submerged at all times.
(L)
Dry pouring of bentonite into the annular space shall be used in accordance
with the following requirements:
(1) Dry
pouring of coarse grade or pelletized bentonite grout must be placed using the
pouring and screening methods described in paragraph (H) of rule
3701-28-09
of the Administrative Code.
(2)
Bentonite shall only be dry poured into an annular space that is greater than
or equal to two inches per side as measured from the outside of the casing or
joint coupling or the outside diameter of the casing where no coupling is
used.
(3) Coarse grade bentonite
may be poured into an annular space, no greater than two-hundred feet in depth.
(4) Coarse grade bentonite shall
be dry poured into the annular space between a permanent casing and temporary
casing during temporary casing removal.
(5) Granular and pelletized bentonite shall
not be dry poured greater than twenty-five feet in depth in a dry annular
space.
(6) Coarse grade, pelletized
or granular bentonite shall not be poured through drilling fluids in the
annular space.
(M) The dry driven
grout method shall be used for grouting the annular space in accordance with
the following requirements where the well is constructed using a cable tool,
driven casing hammer or any other method where permanent steel casing is
driven:
(1) Where temporary outer casing or an
oversized borehole is not used, a collar flared joint or weld bead shall extend
beyond the outside diameter of the permanent casing and dry granular bentonite
shall be poured around the permanent casing as it is being driven.
(2) A drive shoe shall be connected to the
lower end of the casing to be driven.
(3) A starter hole that is larger in diameter
than the driven casing must be constructed to a depth no greater than five feet
before casing is set in place for driving. If the enlarged borehole extends
beyond five feet, than a two inch annular space is required.
(4) Granular bentonite shall be mounded above
or below grade around the exterior of the casing as it is driven. Grout around
the annular space must be kept dry as the casing is being driven.
(N)
Except in naturally
developed wells,
filter packs or formation stabilizers used in wells
completed in unconsolidated or incompetent formations shall meet the
requirements of paragraph (L) of rule
3701-28-09
of the Administrative Code and be placed in accordance with the following
specifications:
(1) Filter pack or formation
stabilizer material shall be placed adjacent to the well screen and extend
above the screen for
a sufficient distance to prevent grout
from being drawn into the screen by the pump. Filter pack or formation
stabilizer shall not be placed in a manner which will interconnect zones of
significantly different hydraulic conductivity. Filter pack or formation
stabilizer shall not extend to less than ten feet from the natural ground
surface.
(2) For wells exceeding
twenty inches in diameter, the filter pack or formation stabilizer shall be no
greater than six inches per side or twelve inches total for wells less than or
equal to thirty feet in depth, and shall be no greater than four inches per
side or eight inches total for wells greater than thirty feet in depth to
facilitate proper well development.
(3) Filter packs and formation stabilizers
shall not be placed inside of casing or liner pipe.
(4) Except for flowing well conditions
described in paragraph (P) of this rule, all drilling fluids shall be flushed
from the annular space prior to placement of the filter pack or formation
stabilizer.
(O) Well screens that meet the specifications
described in paragraph (K) of rule
3701-28-09
of the Administrative Code shall be installed in wells completed in
unconsolidated or incompetent formations, unless geologic formation conditions
prevent their use. Screens shall be attached either directly to the bottom of
the casing, or if installed using telescoping methods to a K-packer that meets
the specification described in paragraph (L) of rule
3701-28-09
of the Administrative Code. Shale traps shall not be used in place of a
K-packer. Well screens shall not be installed less than ten feet from the
natural ground surface nor shall they be driven.
(P) Wells completed in
aquifers constructed using drilling methods except for cable tool drilling,
with hydrostatic heads greater than the land surface elevation shall have
casing and grout installed to protect the aquifer, prevent erosion of the
overlying geologic materials, and prevent flow in the annular space, and shall
be constructed according to the following procedures, as applicable:
(1) If the anticipated flow at the ground
surface is not excessive, after the borehole is drilled, and the casing set,
the water in the casing may be pumped to lower the water level in the casing
and the annular space. The annular space shall then be filled with cement grout
by pressure grouting. However, the density of the cement grout may be greater
than that required under paragraph (F) of rule 3701-28-09
of the Administrative Code to control flow in the annular space.
(2) If the water flow at the ground surface
is designated by the department, the Ohio department of natural
resources division of geological survey, or otherwise known to the
contractor to exceed five gallons per minute or
where conditions exist where a loss of borehole control may occur at the time
the permit is issued, an upper enlarged borehole shall be drilled
partially into the confining formation, or to a minimum of twenty-five feet,
whichever is necessary. The upper enlarged borehole shall be at least four
inches in diameter larger than the nominal diameter of the outer well casing.
The annular space between the upper enlarged borehole and outer well casing
shall be filled with cement grout by pressure grouting. The outer casing shall
be left as permanent casing once the well is completed.
(a) If the confined aquifer is consolidated,
a smaller diameter borehole shall be drilled through the upper enlarged
borehole, the well shall be double cased, the inner casing shall be firmly
seated into the bedrock, and the remaining annular space shall be filled with
cement grout by pressure grouting. However, the density of the cement grout may
be greater than that required under paragraph (F) of rule
3701-28-09
of the Administrative Code to control flow in the annular space.
(b) If the confined aquifer is
unconsolidated, a smaller diameter borehole shall be drilled through the upper
enlarged borehole, with casing and a screen installed into the confined
aquifer. The well shall be double cased, and the remaining annular space filled
with cement grout by pressure grouting. However, the density of the cement
grout may be greater than that required under paragraph
(F) of
rule 3701-17-09 of the Administrative Code to control flow
in the annular space.
(3)
Flowing wells shall be completed at the surface to ensure water does not flow
from under the well cap.
(4)
Flowing well discharge control shall be provided to conserve ground water and
to prevent the loss of artesian head by preventing or reducing continuous
discharges. Flow control shall consist of one of the following methods;
(a) The extension of the well casing to an
altitude corresponding to that of the artesian head.
(b) Installation of a vermin proof cap, well
pitless adapter or wire spud, or to a discharge point that complies with
paragraph (P)(5) of this rule.
(c) Installation of flowing well or spool
type pitless unit, when installed within the manufacturer's specification for
rated pressure.
(d) Other methods
as approved by the department.
(5) After all uses for the private water
systems owner are met, flowing wells may discharge up to ten gallons per minute
when the private water system's owner demonstrates that a suitable discharge
point exists on the owner's property, that the flow control discharge line can
be adequately protected from any possible cross connection, and when one of the
following conditions exist:
(a) Control of
the flow is not practical due to excessive hydrostatic pressure.
(b) Control of the flow will likely result in
the production of sand or turbidity in the water.
(c) The discharge will not adversely affect
surrounding users of ground water or impact surface water drainage.
(d) The discharge line from the well shall
either be protected by an air gap with an animal
guard or a backflow prevention device.
(Q)
Wells completed in cavernous, highly fractured formations, or mine shafts shall
be constructed according to the following, as applicable:
(1) Any cavernous, highly fractured
formations or mine shafts that are not being used as a source of water shall
have casing installed through the cavernous, highly fractured formations or
mine shafts and comply with the following, as applicable:
(a) If cavernous, highly fractured formations
or mine shafts are greater than twenty-five feet from the ground surface, then
one of the following methods of construction shall be used:
(i) The formation or shaft shall be filled
with cuttings, clean gravel or grout, or packers or shale baskets shall be
installed at the top and bottom of the formation or shaft and the fracture or
void is not filled with grout material. The annular space above and below the
void or fracture shall then be filled with cement grout or bentonite
grout.
(ii) A primary casing shall
be set to the top of the void and grouted in place. A secondary casing may be
set inside the primary casing and the secondary casing extended through the
void into the borehole below the void and grouted in place.
(b) If cavernous, highly fractured
formations or mine shafts are less than twenty-five feet from the ground
surface, casing shall be installed in an enlarged borehole and the annular
space shall be filled with a cement grout containing additives that promote
bridging of the cavernous, highly fractured formations or mine shafts by
pressure grouting or by dry pouring coarse grade or pelletized bentonite to a
depth of at least five feet beyond the cavernous, fractured formation or mine
shaft.
(2) If the
cavernous, highly fractured formation or mine shaft is to be used as the source
of water supply, then a packer or shale trap or
cement basket shall be installed at the top of the formation or shaft and
the annular space shall be filled with cement grout or bentonite grout by
pressure grouting or dry pouring of coarse grade bentonite.
(R) Wells completed in geologic formations that
produce saline water at a concentration exceeding three thousand milligrams per
liter shall be constructed according to the following procedures:
(1) Any saline producing formations that are
encountered during drilling shall have casing installed through the saline
producing formation and the annular space contiguous to the saline producing
formation shall be filled with cement grout by pressure grouting or the well
shall be sealed to an elevation higher than the top of the saline producing
formation. Grouts that are not adversely affected by the saline water shall be
used for sealing the well or annular space.
(2)
Upon
identification of the occurrence of a saline producing well by the board of
health or the department, actions to mitigate the production of saline water in
the well must be initiated within ninety days.
(3) If the saline
producing formation cannot be successfully isolated from the water source, then
the entire well shall be sealed in accordance with rule
3701-28-17
of the Administrative Code or the system owner shall apply for a variance for
continued use of the water. In no case shall a variance allow the well
producing saline water to mix with another aquifer producing fresh water and
contaminate the aquifer or another private water system.
(S)
Wells that produce dissolved methane gas greater
than or equal to ten milligrams per liter, or methane production in the borehole shall be
vented to the atmosphere to prevent explosive conditions and minimize human
exposure using one of the following methods:
(1) Venting the well through the use of
vented well cap where the vent diameter is no less than one inch in diameter,
and the vent opening is screened in accordance with paragraph
(U)(5)
of this rule and extended to a height to prevent combustion from normal
activities around the home.
(2)
Use of a vented tank equipped with a spray bar or nozzle to disperse the water,
a vent pipe with screen and flap valve to allow escape of the gas to the
atmosphere to an elevation greater than the roof of the house, or vented
discharge no less than ten feet from the foundation using a smaller diameter
screened and downturned pipe to promote air flow, and a check valve after the
tank and prior to an additional pump to pressurize the distribution system.
Manufactured venting systems shall be installed in accordance with the
manufacturer's requirements.
(3) Wells located in
basements, well houses, offsets or other structures shall be vented to the
outside of the structure with a minimum three inch vent pipe extending ten feet
from the foundation of the house, installed no less than eighteen inches from
the ground surface, and the end of the vent pipe downturned and properly
screened to prevent the entrance of insects and animals.
(4)
Other methods of methane gas venting as approved by the
department.
(T)
Except when a hand pump has been installed in
accordance with paragraph (P) of rule
3701-28-08
of the Administrative Code,
all wells shall be equipped with a pitless adapter or
pitless unit that meets the current water systems council pitless adapter
standard and provides for the prevention of the entrance of surface water,
dirt, animals, insects, or other foreign matter. The department
shall approve all pitless adapters and pitless units and installation
procedures for use in above and below ground installations if the
department determines that the pitless adapter or
pitless unit and installation procedures adequately prevent the entrance of
surface water, dirt, animals, insects, or other foreign matter.
(1) Pitless units that connect to a well
casing must extend at least twelve inches above the ground surface and be
connected to the casing through one of the following methods:
(a) A threaded connection;
(b) A welded or solvent cemented
connection;
(c) Bolted flanges with rubber gaskets;
(d)
Extension of the casing at least one inch into the base of a power pump mounted
on and sealed to a concrete pedestal; or
(e) When the steel well casing pipe is not terminated
at the desired depth for the installation of an approved pitless unit, the well
casing pipe shall be cut off at the desired height, and the pitless unit may be
welded or threaded and coupled to the top of the well casing pipe in accordance
with the manufacturer's requirements.
(f) The inside
diameter of the pitless unit shall not be smaller than the inside diameter of
the casing.
(2) Pitless
adapters that connect to a well casing must be installed below the local frost
line and be connected to the casing using one of the following methods:
(a) Approved pitless adapters
shall be connected by welding,
bolting or clamping as required by the type and the manufacturer. Any hole constructed into the side of the
casing for access by the pitless adapter shall be of the size and dimension as
required by the manufacturer, and shall be made using a hole saw or a cutting
torch. The use of a cutting guide is required.
(b) No part of a pitless adapter may extend
into the inside diameter of a well casing so that setting or removal of the
pump, pump piping or drop pipe, or the use of tools for well rehabilitation or
disinfection is impeded for wells greater than or equal to a nominal pipe size
of five inches. All parts of the pitless adapter within the interior of the
casing shall be removable through the top of the well casing and shall provide
complete clearance within the internal diameter of the well casing for wells
equal to or less than four inches in diameter.
(c) Upon installation of the pitless adapter,
the excavation surrounding the casing and pitless adapter shall be backfilled
with clean clay or native soils. Voids present below the pitless adapter shall
be filled with bentonite grout.
(3) Pitless adapter or pitless unit
connections to thermoplastic pipe shall meet the following requirements:
(a) Steel well casing pipe extensions,
pitless units or pitless adapters shall not be welded after they are attached
to thermoplastic well casing. The thermoplastic coupling shall be threaded onto
the pitless unit before it is solvent cemented to the top of the
casing.
(b) Threaded connections
or flanges shall only be used on pitless units or
pitless adapters after attachment to the well casing pipe.
(c) Where approved pitless adapters are
installed by clamping on thermoplastic casing they
shall be installed as per the manufacturer's specifications with deep
pump installations of one hundred feet or more
and low static water levels, a backing plate, wide steel strap or casting shall
be installed to protect the integrity of the thermoplastic casing at the point
of the pitless adapter connection.
(4) Except as provided in paragraph
(S) of
this rule and
paragraphs (E)and
(G) of rule
3701-28-02
of the Administrative Code the well casing height above finished grade shall be
a minimum of twelve inches.
(5) The
top of the casing at its finished height shall be cut so that the surface will
fit flush with the well cap and provide a tight seal.
(U)
All well caps and seals shall meet the current water systems council
well cap standard and meet the following
requirements:
(1) All well caps and seals
shall fit securely to the top of the well casing to provide a weather tight
seal to prevent the entrance of insects, be secured with screws or other
appropriate connections, and vented to the atmosphere.
(2) Electrical conduit connections on well
caps or seals shall be threaded and the space between the wire and conduit must
be sealed to prevent the entrance of insects and water.
(3) Wells where the pitless adapter or
distribution lines have not been installed shall have an approved cap placed on
the well at all times.
(4) Except
for venting in a floodplain or methane gas control, holes for any purpose shall
not be installed in a well cap.
(5)
Except for drive point wells, the installation of vents shall comply with the
following requirements:
(a) A casing vent
shall be provided on all well caps and seals except for those used on deep well
single pipe packer jet installations or on flowing wells where the flow rate is
greater than the pumping rate of the permanent pump.
(b) A vent shall be self-draining, screened
with a non-corroding mesh screen of adequate dimensions to prevent the entrance
of insects, pointed downward, and terminate not less than twelve inches above
the ground surface or above the floor of a basement, basement offset, pump
room, or at a point not less than three feet above the elevation of a
one-hundred year flood plain. The vent shall provide for adequate air
flow.
(c) For casing with inside
diameters equal to or less than six inches, the total vent surface area shall
be no less than three quarters of an inch in diameter.
For casing with inside diameters greater than six inches. The
total vent surface area shall be no less than one inch in diameter.
(6) Wells located in a
one-hundred year flood plain shall have watertight caps with either the casing
extending a minimum of three feet above the one-hundred year flood elevation or
the vent, or shall be equipped with self-sealing type vents that seal upon
inundation by water.
(V)
The maintenance and modification of wells shall comply with the following:
(1) Casings and tops of wells shall be
protected against contamination at all times.
(2) If a casing deteriorates to such an
extent that contamination may occur and the well cannot be repaired, new casing
that meets the requirements of paragraph (B) of this rule shall be installed,
or the well shall be sealed in accordance with
rule
3701-28-17
of the Administrative Code.
(3) If
any part of the pump, distribution system or any connection malfunctions or
becomes defective in such a fashion that contamination may occur, the pump or
connection or part of the distribution system shall be promptly repaired or
replaced as necessary to prevent contamination.
(4) A well shall be disinfected in accordance
with rule
3701-28-11
of the Administrative Code after maintenance or repair of the
well.