HomeMy WebLinkAboutA001 - Council Action Form dated August 10, 2021 ITEM # 21
DATE: 08-10-21
COUNCIL ACTION FORM
SUBJECT: 2021 UNIFORM PLUMBING CODE AND 2021 INTERNATIONAL
MECHANICAL CODE ADOPTION
BACKGROUND:
The Uniform Plumbing Code (UPC), published by the International Association of
Plumbing and Mechanical Officials (IAPMO), and the International Mechanical Code
(IMC), published by the International Code Council (ICC), are the two model codes of
standards for plumbing and mechanical construction and maintenance in use throughout
the United States.
These Codes are typically updated at three-year intervals to reflect the latest
improvements in construction technology. However, the state of Iowa skipped the 2018
adoption cycle. Therefore, the City of Ames is currently regulated by the 2015 version of
the codes. On June 23, 2021, the State adopted the 2021 Uniform Plumbing Code and
the 2021 International Mechanical Code with amendments.
In previous years, local jurisdictions had the option to adopt different codes, so long as
the code was not less restrictive than state law (e.g., the International Plumbing Code,
which is published by a different organization than the UPC, could be amended and
adopted if the City desired).
However, state law now requires adoption of the UPC and IMC. Alternative codes
are not permitted, but local amendments to the UPC and IMC may be adopted so
long as they are not less restrictive than the UPC and IMC. In previous years, the
City adopted the International Fuel Gas Code (IFGC) for fuel gas installations in lieu
of Chapter 12 of the UPC. With this year's requirement to adopt the same codes as
the state, the City must adopt Chapter 12 of the UPC; therefore, the need for the
City to adopt the IFGC has been eliminated.
CODE CHANGES:
The first step in the code adoption process was an in-depth review of the 2021 UPC and
2021 IMC and their state amendments by Inspections staff and the Legal Department.
The state adopted several amendments to the 2021 UPC and IMC. In addition, the City
historically had several local amendments to the Plumbing Code. Staff has reviewed the
local amendments to determine if they are still applicable. Several of the amendments
are no longer needed because they are included in the new State requirements. Staff is
proposing no new local amendments compared to previous versions of these
codes.
1
While not a change in a local requirement, one revision that is being proposed is
the movement of the local cross-connection control amendments as they currently
exist from Chapter 5 (Plumbing and other Codes) of the Ames Municipal Code to
Chapter 28 (Utilities) of the Ames Municipal Code. Cross-connection controls are the
requirements that protect the water utility system from contamination. Staff from the
Inspections Division and Water and Pollution Control Department discussed the cross-
connection requirements in the City's local amendments and agreed they would be better
suited outside of Chapter 5 because they have different enforcement and appeal
capabilities.
Attachment A reflects the proposed UPC and IMC with amendments as approved by the
Building Board of Appeals. Attachment B shows the existing codes with strikethrough for
those sections that are proposed to be deleted. It also has the sections that are being
added underlined. All the underlined sections are amendments from the State of Iowa
that the City is required to adopt. Attachment C highlights some of the more notable
changes between the code editions.
PUBLIC INPUT:
After a staff review of the codes was completed, the process moved to the Building Board
of Appeals. The Building Board of Appeals is a seven-member board tasked with
reviewing proposed text amendments to Ames Municipal Code, Chapter 5, Building,
Electrical, Mechanical and Plumbing Code. Each member is qualified by experience and
training in matters pertaining to building construction. Proposed text amendments are
reviewed by the Board with a public hearing and recommendation to the City Council.
On July 12, 2021, Inspections staff sent an e-mail to all plumbing and mechanical
contractors who have done business with the Inspection Division within the last year, and
to the Ames Home Builder's Association (AHBA) to notify them of the proposed 2021
UPC and IMC adoption process. They were informed that their attendance and input at
the August 2, 2021 , Building Board of Appeals meeting would be welcome. An additional
email was sent on July 26, 2021 to the same group reminding them of the Board meeting
on August 2, 2021 and providing them with a copy of the proposed code and significant
changes.
The Building Board of Appeals held a public hearing on August 2, 2021. There were no
contractors present for the meeting and no public input submitted. As a result, the Board
made a motion to recommend to the City Council approval of the 2021 UPC and the 2021
IMC with the State of Iowa amendments and local amendments.
A third email was sent to contractors on August 3, 2021, notifying them of the Board's
decision and Staff's intent to place this matter on the August 10, 2021 City Council
Agenda to request that the required public hearing for adoption of the two codes be set
for August 24, 2021.
2
ALTERNATIVES:
1. Set the public hearing for August 24, 2021 to review the proposal to adopt the 2021
edition of the Uniform Plumbing Code (UPC) and the 2021 edition of the
International Mechanical Code (IMC) with the same amendments adopted by the
State of Iowa and the local amendments recommended by the Building Board of
Appeals.
2. Direct staff to work with the Building Board of Appeals to develop further local
amendments to the recommended codes.
CITY MANAGER'S RECOMMENDED ACTION:
City staff and the Building Board of Appeals have reviewed the proposed codes and have
recommended approval to the City Council. The State Codes were in effect on June 23,
2021 and all local jurisdictions are required to adopt, at minimum, the same code as the
State Code at that time.
It is therefore the recommendation of the City Manager that the City Council adopt
Alternative No. 1, as described above.
3
Attachment A
Proposed Code
Sec.5.100(11)Mechanical.Delete this section in its entirety and replace with the following:
(11) Mechanical. The provisions of the International Mechanical Code (IMC) 2021 Edition, published by the
International Code Council, 4051 West Flossmoor Road, Country Club Hills, IL 60478, are hereby adopted by
reference with amendments as the City of Ames Mechanical Code.
Sec.5.100(12)Plumbing. Delete this section in its entirety and replace with the following:
(12) Plumbing.The provisions of the Uniform Plumbing Code(UPC), Sections 101 and 102 and Chapters 2
through 17 of the Uniform Plumbing Code,2021 Edition,as published by the International Association of Plumbing
and Mechanical Officials,4755 E.Philadelphia Street,Ontario,California 91761-2816,are hereby adopted by
reference with amendments as the City of Ames Plumbing Code.
Sec.5.100(13)Gas. Delete this section in its entirety and replace with the following:
(13) Gas.Fuel gas piping shall comply with the requirements of Chapter 12 of the Uniform Plumbing Code,2021
Edition, as published by the International Association of Plumbing and Mechanical Officials, 4755 E. Philadelphia
Street,Ontario,California 91761-2816 and adopted by the City of Ames with amendments as the City of Ames Fuel
Gas Code, unless the provisions conflict with the Iowa Administrative code (IAC) 661-Chapter 226, Liquified
Petroleum Gas. Where Chapter 12(2021UPC) conflicts with 661-chapter 226(IAC), the provisions of Chapter 226
shall be followed.
Section 5.206 MECHANICAL.Delete Section 5.206 in its entirety and insert the following in lieu thereof:
Section 5.206. MECHANICAL.
The adopted provisions of the 2021 International Mechanical Code(IMC),are amended as follows:
(1) Section 101.2 Scope.is amended by deleting the words `by the International Fuel Gas Code'in the last
sentence and inserting the following in lieu thereof: `by Chapter 12 of the UPC as stated in Section
5.100(13)of this Chapter'.
(2) Section 101.2 Scope.is amended by deleting the following:"Exception:Detached one-and two-family
dwellings and townhomes not more than three stories above grade plane in height with a separate means
of egress and their accessory structures not more than three stories above grade plane in height shall
comply with this code or the International Residential Code."
(3) Section 304.11 Guards.is amended by deleting the exception and inserting the following new
exception in lieu thereof. "Exception: Guards are not required where permanent fall arrest/restraint
anchorage connector devices that comply with ANSI/ASSE Z 359.1 are affixed for use during the
entire lifetime of the roof covering.The devices shall be evaluated for possible replacement when the
entire roof covering is replaced.The devices shall be placed not more than 10 feet(3048 min)on
center along hip and ridge lines and placed not less than 10 feet(3048 mm)from roof edges and the
open sides of walking surfaces."
(4) Section 306.1 Access. is amended by deleting the last sentence and inserting the following in lieu
thereof: "An unobstructed level working space at least 30 inches deep and 30 inches wide shall be
provided on any side of equipment where service access is required.The authority having jurisdiction
Attachment A
may approve service reductions prior to equipment installation,provided that the manufacturer's
instructions are met."
(5) Section 306.2 Appliances in attics. is amended by deleting this section in its entirety and inserting
the following section in lieu thereof: "Section 306.2 Appliances in attics.Appliances in rooms and
closets.Rooms and closets containing appliances shall be provided with a door and an unobstructed
passageway measuring not less than 36 inches wide and 80 inches high. A level service space not less
than 30 inches deep and 30 inches wide shall be present at the front service side of the appliance with
the door open."
(6) Section 306.5. Equipment and appliances on roofs or elevated structures.is amended by adding
the following to the end of the section: "If the tenants of a multiple tenant building have,or are allowed
to have,mechanical facilities on the roof or which penetrate the roof,then roof access ladders must be
provided for use by all such tenants and their agents and contractors in a manner that does not require
accessing space under the control of another tenant."And deleting the following exception"Exception:
This section shall not apply to Group R-3 occupancies."
(7) Section 306.5.3 Visual screening of rooftop equipment.is amended by deleting this section in its
entirety and inserting the following section in lieu thereof. "Section 306.5.3 Visual screening of
rooftop equipment.Equipment screening shall not be installed to the rooftop unit or the curb of the
rooftop unit unless specified in the mechanical equipment manufacturer's installation instructions."
(8) Section 401.1 Scope.is amended by deleting the section in its entirety and inserting the following
section in lieu thereof. "Section 401.1 Scope.This chapter shall govern the ventilation of spaces
within a building intended to be occupied.These buildings shall meet either the requirements of
ASHRAE Standard 62.1,"Ventilation for Acceptable Indoor Air Quality,"2019 edition,published by
the American Society of Heating,Refrigeration,and Air-Conditioning Engineers, 1791 Tullie Circle
N.E.,Atlanta,GA 30329,or the requirements contained in this chapter.Mechanical exhaust systems,
including exhaust systems serving clothes dryers and cooking appliances;hazardous exhaust systems;
dust,stock,and refuse conveyor systems; sub slab soil exhaust systems; smoke control systems;energy
recovery ventilation systems; and other systems specified in Section 502 shall comply with Chapter 5."
(9) Table 4033.3.1.1 Minimum Ventilation Rates: is amended by adding the following footnotes:
i. For gym, stadium, arena(play area) categories of the sports and amusement occupancy. When
combustion equipment is intended to be used on the playing surface, additional dilution ventilation
and/or source control shall be provided.
j.For ventilation purposes,"smoking"includes both combustible tobacco products and accessories
and electronic smoking devices and accessories.
(10)Section 504.9.2 Duct installation. is amended by deleting the section in its entirety and inserting the
following section in lieu thereof. "504.8.2 Duct installation.Exhaust ducts shall be supported at 4-foot
(1219 mm)intervals and secured in place.The insert end of the duct shall extend into the adjoining duct
or fitting in the direction of airflow.Ducts shall not be joined by screws or similar fasteners that protrude
into the inside of the duct."
(11)Section 506.3.13.3 Termination location.is amended by deleting the section in its entirety and
inserting the following new section in lieu thereof: "506.3.13.3 Termination location.Exhaust outlets
shall be located not less than 10 feet(3048 nun)horizontally from parts of the same or contiguous
Attachment A
buildings,adjacent buildings and adjacent property line and shall be located not less than 10 feet(3048
mm)above the adjoining grade level.Exhaust outlets shall be located not less than 20 feet
horizontally/vertically from or not less than five(5)feet above air intake openings and operable doors
and windows into any building."
(12)Section 507.3 Type II Hoods. is amended by deleting the first sentence in its entirety and inserting the
following sentence in lieu thereof: "Type II hoods shall be installed above dishwashers capable of
heating water beyond 140 degrees Fahrenheit and appliances that produce heat or moisture and do not
produce grease or smoke as a result of the cooking process, except where the heat and moisture loads
from such appliances are incorporated into the HVAC system design or into the design of a separate
removal system."
(13)Section 508.1.1 Makeup air temperature. is amended by deleting the section in its entirety and
inserting the following section in lieu thereof: "Section 508.1.1 Makeup air temperature. All kitchen
makeup air systems shall be verified by a certified TAB(testing and balance)contractor to heat and cool
makeup air to within 10 degrees of room temperature set point.The TAB contractor shall be certified by
NEBB,TABB,or other certifying organization as approved by the Authority Having Jurisdiction."
(14)Section 601.5 Return air openings. is amended by adding the following two additional requirements
for return air openings:
"9.Return air openings shall be located at least 18 inches from supply air openings.Air throw shall
be directed away from return air openings to reduce short cycling of air. Exception: Factory-made
concentric duct terminations.
10. One return air opening per floor is required on a central duct return system per ACCA Manual
D, Appendix 8. Return air transfer openings are required on all bedrooms when dedicated return air
openings are not used."
(15)Section 603 Duct Construction and Installation.is amended by adding the following new subsection:
"603.1.1 Duct location.Air plenums and ducts located in floor and wall cavities shall be separated from
unconditioned space by construction with insulation to meet energy code requirements. These areas
include but are not limited to exterior walls,cantilevered floors,and floors above garages."
(16)Section 604.3 Coverings and linings. is amended by deleting the section in its entirety and inserting
the following new section in lieu thereof:"604.3 Coverings and linings.Duct coverings and linings,
including adhesives where used,shall have a fame spread index of not more than 25 and a smoke-
development index of not more than 50,when tested in accordance with ASTM E84 or UL 723,using
the specimen preparation and mounting procedures of ASTM E2231.Duct coverings and linings shall
not fame,glow,smolder or smoke when tested in accordance with ASTM C411 at the temperature to
which they are exposed in service. The testing temperature shall not fall below 250°F(121°C).
Coverings and linings shall be listed and labeled. The use of an air gap to meet R-value requirements
for duct insulation shall be prohibited."
(17)Section 607.6.2 Membrane Penetrations is amended by adding the following exception: "Exception:
Duct systems that originate and terminate entirely within one dwelling/sleeping unit and are constructed
entirely of minimum 0.0187-inch-thick steel (No. 26 gauge) shall be allowed without installation of
radiation dampers."
Attachment A
(18)Section 607.6.2.1.3. is amended by deleting the section in its entirety and inserting the following new
section in lieu thereof. "607.6.2.1.3 Access. Access to ceiling radiation dampers shall be provided with
an approved means of access that is large enough to permit inspection and maintenance of the damper
and its operating parts.Dampers equipped with fusible links,internal operators for both shall be provided
with either an access door that is not less than 12 inches(305mm)square,or a removable duct section."
(19)Section 607.6.2.1.4.is amended by inserting the following new section: 11607.6.2.1.4 Identification of
access. Access to ceiling radiation damper locations and access points shall be permanently identified
on the exterior by a label or marking acceptable to the authority having jurisdiction."
Attachment A
Sec.5.208. PLUMBING.Delete Section 5.208 in its entirety and insert the following in lieu thereof:
See.5.208 PLUMBING.
The adopted provisions of the 2021 Uniform Plumbing Code(UPC),are amended as follows:
(1) Section 102.4.1 Building Sewers and Drains. is amended by adding the following new section:
"Section 102.4.1.1 Building Demolition.Whenever a structure or building is to be demolished,before
demolition begins the following must be completed:
(a)Building sewer capped at curb line with a manufactured plug.
(b)Foundation line capped at curb line with a manufactured plug.
(c)Water service capped or plugged at main.
(d)Plumbing inspector sign-off on demolition sheet given to contractor before demolition
permit is issued."
(2) Section 102.0 Applicability. is amended by adding a new subsection "Section 102.9 Annexed
Building.When a structure or building is on land that has been or is being annexed into the City of Ames
and connection to the public water or sewer system is requested for that building or structure,the City
may require that its plumbing system be inspected to determine whether the system has adequate sewer
venting and backflow prevention to protect the public water system, and to determine if it is otherwise
free from hazards to those exposed or potentially exposed to that system. Based on that inspection,if it
is determined that a cross connection or other hazard exists,then the City shall determine what corrective
action is needed to eliminate the hazard(s) and the owner shall complete the corrective action before
connection to City services is allowed."
(3) Section 301.5 Alternative Engineered Design.is amended by adding the following sentence to the end
of the section: "No engineered single-stack drainage system shall be installed."
(4) Section 309.6 Dead Legs.is amended by adding the following sentence to the end of the section: "The
authority having jurisdiction can determine the method of flushing."
(5) Section 312.6 Freeze Protection.is amended by adding the following at the end of the section:"Systems
requiring protection from freezing shall be buried no less than five(5)feet in depth from finished grade.
If this depth cannot be maintained,the sides and top of pipe wall shall be covered with 1 'h"blue board
insulation. The sides of the insulation shall be at least five(5)feet in depth."
(6) Section 314.4.1 Installation of Thermoplastic Pipe and Fittings. is deleted in its entirety and a new
section is inserted in lieu thereof."Section 314.4.1 Installation of Thermoplastic Pipe and Fittings.
Trench width for thermoplastic pipe shall be limited to six times the outside diameter of the piping at
the base.Thermoplastic piping shall be bedded in not less than 4 inches(102 mm)of aggregate
bedding material supporting the pipe.Initial backfill shall encompass the pipe.Aggregate material
shall be three-eighths(3/8)inch p-gravel or 1-inch clean class one bedding."
(7) Section 402.5 Setting.is amended by adding the following sentence to the end of the section that
begins"Exception:": "Sanitary napkin receptors are not dispensers and shall not be within the clear
space of the water closet."
Attachment A
(8) Section 407.3 Limitation of Hot Water Temperature for Public Lavatories.is amended by adding
the following sentence to the end of the section: "These devices shall be installed at or as
close as possible to the point of use."
(9) Section 408.3.2 Temperature Limiting.
(1)Amend this section by adding the following to the end of(3): "and installed at or as close as
possible to the point of use."
(2)Amend this section by adding the following to the end of(5): "may be used downstream of
other allowed device.TAFR valves are not intended to be installed in place of devices complying
with ASSE 1016,ASSE 1017,ASSE 1066,ASSE 1069,or ASSE 1070."
(10) Section 408.0 Showers.is amended by adding a new subsection: "Section 408.11 Shampoo Bowls
and Grooming Stations.Limitation of Hot Water Temperature of Hair Shampoo Bowls and Pet
Grooming Stations.The maximum hot water temperature discharging from hair shampoo bowls and
pet grooming stations shall be limited to 120OF(49°C).The maximum temperature shall be regulated
by one of the following means,which shall be installed at or as close as possible to the point of use:
"(1)A limiting device conforming to ASSE 1070,ASME Al 12.1070,CSA B125.70,or
CSA B125.3.
"(2)A water heater conforming to ASSE 1084."
(11) Section 409.4 Limitation of Hot Water in Bathtubs and Whirlpool Bathtubs. is amended by
adding the following sentence to the end of the section: "These devices shall be installed at or as close
as possible to the point of use."
(12) Section 410.3 Limitation of Water Temperature in Bidets.is amended by adding the following
sentence to the end of the section: "These devices shall be installed at or as close as possible to the
point of use."
(13) Section 416.5 Drain.is amended by deleting the last sentence,which states: "Where a drain is
provided,the discharge shall be in accordance with Section 811.0."
(14) Section 418.3 Location of Floor Drains is amended by adding the following new subsection:
"418.3(5)In all buildings,a three-inch(3")floor drain shall be located on the lowest floor level and
where the water meter is located.A three-inch(3")or larger floor drain shall be located in the same
room where a reduced pressure principal backflow prevention assembly is installed that discharges
water.A two-inch(2")or larger floor drain shall be provided in the same room the water heater is
located on the lowest floor level.
Exception: Existing water heaters and water meters unless relocated."
(15) Section 422.1 Fixture Count.
(1)Amend the section by deleting the first paragraph and inserting the following in lieu thereof:
"Plumbing fixtures shall be provided in each building for the type of building occupancy and in the
minimum number shown in Table 2902.1 and its associated foot notes of the 2021 International
Building Code.Required public facilities shall be designated by a legible sign for each sex. Signs shall
be readily visible and located near the entrance to each toilet facility."
(2)Amend the section by deleting the second paragraph and inserting the following in lieu thereof:
"The minimum number of fixtures shall be calculated at 50 percent male and 50 percent female based
on the total occupant load.Where information submitted indicates a difference in the distribution of the
Attachment A
sexes,such information shall be used to determine the number of fixtures for each sex.Once the
occupancy load and occupancy are determined,Table 2902.1 shall be applied to determine the
minimum number of plumbing fixtures required.When gender-neutral restrooms are provided,the
total number of fixtures provided must be the sum of men's and women's fixtures as figured,and
urinals in gender-neutral restrooms shall not be substituted for more than 67 percent of men's water
closets in assembly and educational occupancies or 50 percent of men's water closets in all other
occupancies.Where gender-neutral fixtures are provided in addition to separate men's and women's
facilities,those gender-neutral fixtures shall be included in determining the number of fixtures
provided in an occupancy.Where applying the fixture ratios in Table 2902.1 results in fractional
numbers,such numbers shall be rounded to the next whole number.For multiple occupancies,
fractional numbers shall be first summed and then rounded to the next whole number."
(16) Section 422.1.1 Family or Assisted-Use Toilet and Bathing Facilities.is amended by adding the
following sentence to the end of the section: "Required family or assisted-use fixtures are permitted to
be included in the number of required fixtures for either the male or female occupants in assembly and
mercantile occupancies."
(17) Table 422.1 Minimum Plumbing Facilities.Delete the table.
(18) Section 422.2 Separate Facilities.is amended by adding the following additional exception: "(4)
Separate facilities shall not be required where rooms having both water closets and lavatory fixtures
are designed for use by any gender and sufficient privacy for water closets is installed.Partitions or
compartment walls shall extend from no more than 1 inch from the floor to no less than 84 inches from
the floor.Urinals shall be located in an area visually separated from the remainder of the facility or
each urinal that is provided shall be located in a stall."
(19) Section 422.0 Minimum Number of Required Fixtures.is amended by inserting the following new
subsection: "422.6 Substitution for Water Closets. "In each bathroom or toilet room,urinals shall not
be substituted for more than 67 percent of the required water closets in assembly and educational
occupancies.Urinals shall not be substituted for more than 50 percent of the required water closets in
all other occupancies. (Reprinted from the 2018 International Plumbing Code section 424.2)"
(21) Section 604.6 Cast-Iron Fittings is deleted.
(22) Section 604.7 Malleable Iron Fittings is deleted.
(23) Section 604.10.1 Tracer Wire.is deleted and the following is inserted in lieu thereof: "604.10.1
Tracer Wire.Plastic materials for building supply outside underground shall be installed with a 14-
gauge solid copper tracer wire in a blue jacket affixed to the pipe at appropriate intervals. The tracer
wire will start with a 5-foot electrical ground stake at the water main and be terminated at a
weatherproof junction box at an approved location on the building exterior. An appropriate splice may
be used at the water meter. The junction box shall be accessible and be labeled to identify it as a tracer
wire termination."
(24) Section 609.1 Installation.is deleted in its entirety and the following is inserted in lieu thereof:
"Section 609.1 Installation.Water piping shall be adequately supported in accordance with Table
313.3.Burred ends shall be reamed to the full bore of the pipe or tube. Changes in direction shall be
made by the appropriate use of fittings,except that changes in direction in copper or copper alloy
tubing shall be permitted to be made with bends,provided that such bends are made with bending
Attachment A
equipment that does not deform or create a loss in the cross-sectional area of the tubing. Changes in
direction are allowed with flexible pipe and tubing without fittings in accordance with the
manufacturer's instructions. Provisions shall be made for expansion in hot-water piping.Piping,
equipment,appurtenances,and devices shall be installed in a workmanlike manner in accordance with
the provisions and intent of the code.Building supply yard piping shall be not less than 60 inches
below earth cover."
(25) Section 609.1 Installation.is amended by adding the following new sections 609.1.1 through 609.1.9
"Section 609.1.1 New Service Location.In a new subdivision the water service line shall be installed
at the center of the property unless otherwise approved by the Administrative Authority.
Section 609.1.2 Threaded Taps on Water Mains. All threaded taps on the main shall be at least 24
inches apart and shall be at least 3/4 inch in size. If more than one tap is made for a service line,the taps
will be staggered on the pipe.No more than three(3)threaded taps shall be made for a service connected
to a 4-inch or larger main.Maximum threaded tap size for a 4-inch main is 3/4 inch.All taps will be made
in the top half of the water main,but not more than 45" above the horizontal plane.All services having
two (2)taps or more shall be combined through a brass wye pipe connection. The maximum length of
service from the main to the wye shall be four(4)feet. The following table lists appropriate number of
taps for different service sizes.
Service Size Taps
1 inch=two 3/4 inch or one 1 inch
1'/4 inch=two 1 inch
1'/z inch=two 1 inch
Section 609.1.3 Corporation Cock Required.A corporation cock of either a Mueller or Ford make,or
its equivalent,shall be inserted in every tap one-and one-half inch or less in diameter made in the water
main. The connection to the main shall be made by a regulation corporation cock and copper service
with a compression joint if the pipe is plastic SIDR-7 200 P 3408. All connections to the water main
shall be adequately looped to prevent breakage from ditch settlement.
Section 609.1.4 Service Valve Required. A service valve shall be installed immediately following a
two(2)inch or larger tap on all take offs from the water main or private main.
Section 609.1.5 Service Saddles. Service saddles allowed on four(4)inch or larger water mains when
water service is 3/4", 1", 1'/4", and 1'/2" shall have a stainless-steel strap with two bolts wide minimum.
The bolts or nuts shall be either stainless steel or blue coated. When tapping a four(4) inch or larger
main for water services for a two(2)inch or larger water service,the service saddle shall be a stainless-
steel full wrap around saddle.The bolts and nuts shall be either stainless steel or blue coated.Any water
service that is larger than a two (2)inch shall require a tapping valve and sleeve at the main or private
main. The Post Indicator Valve (PIV) for fire line shall not serve as the water service valve after the
main.All tapping valve sleeves shall meet the Urban Standard Specifications as follows:
(1)Valve: Tapping valve conforming to ANSI/AWWA C509.
(2)Sleeve:
(a)Minimum 14 gauge
(b)Stainless steel,ASTM A240,Type 304
(c)Working pressure 200 psi.
(d)Must fully surround pipe
(3)Gasket:
(a)To completely surround pipe
(b)Minimum thickness 0.125 inch
(c)Material:nitrile rubber.
(4)Outlet Flange:
(a) Stainless steel,ASTM A240,Type 304
Attachment A
(b)ANSI B 16.1, 125 pound pattern
(5)Bolts: Stainless steel,ASTM A240,Type 304
Section 609.1.6 Curb Stop required.There shall be a curb stop in every service connection to the main.
It shall be located on the property line or as close as possible thereto and in alleys within one foot of the
alley line,except two(2)inch and larger,which shall have a street valve box over the valve at the water
main.Curb Stops shall be of the quarter turn ball valve type with the grip joint ends.The curb stop to be
used for services from three-fourths(1/4)inch to two(2)inches shall be the style known as Mueller Mark
11 Oriseal or Ford Ball Valve with 90' curb stop, or equal, provided with T handle and extension rod
keyed and locked to curb stop and shall be the same diameter as the pipe served.The curb stop shall be
kept in an operative condition at all times.
Section 609.1.7 Curb Box required. The curb stop shall be covered by a curb box of the Western
pattern No. 100,or equal,extending to the curb grade.In cases where the surface of the ground is higher
than the curb grade to the extent that the curb box will not extend sufficiently to be in plain view,then
the curb box shall be extended to the ground surface.Whenever a water service is renewed the curb box
shall be brought to the curb grade or present natural ground level and moved to the property line. In
placing the curb stop in position, care must be exercised to provide against settlement of the curb box,
by providing a base of brick, stone or concrete block set on solid earth for support. A support shall be
placed across the ditch and wired to the curb box near the top to keep it in a vertical position while filling
the ditch. In the event a curb box is set in any location where a concrete or asphalt surface is to be placed,
a sleeve shall be placed around the cap to allow for expansion and contraction.
Section 609.1.8 Water Services Serving Fire Sprinkler Systems. Sprinkler systems used for fire
protection may be permitted to be attached to the water mains by a licensed Plumbing Contractor. No
open connection can be incorporated in the system,and there shall be no valves except the service valve
at the main unless a post indicator valve (PIV) is required. One- and two-family residential sprinkler
lines shall be metered through the single meter. The property owner or tenant shall promptly report to
the City any seal which has been broken for the closing of the system.A detailed drawing of the sprinkler
system shall be filed with the City and free access to the building shall be granted the City for inspection
purposes.Water services shall be sized to accommodate the requirements of the fire sprinkler system.
Section 609.1.9. Where required,a post indicator valve(PIV)must beset at 36"above final grade.The
termination flange, inside the building, shall not be more than twelve (12) inches above finished floor
level and be set at a true vertical position.When entering through a wall,the termination flange shall not
be more than twelve (12) inches from the wall and set in a true horizontal position. The fire line shall
have a two hundred(200)pound pressure test done for a minimum of two(2)hours without losing any
pressure. The fire line shall be tested from the tap at the main to the termination flange with the PIV
open and the curb box closed.No fire line static pressure test shall be started after 1:30 p.m., Monday
through Friday.
A certified fire sprinkler installer may install the backflow device to the sprinkler system for
containment.The termination flange,inside the building,from horizontal to the vertical position or from
horizontal to the horizontal position traveling through an exterior wall or floor, shall have no smaller
than 1/4 inch galvanized or equivalent all-thread rod used between said flanges to keep fire line
termination stable. The fire line located in the trench may use mega-lug type supports, however, a
concrete thrust block shall be in front of fire line traveling from horizontal to vertical prior to the
termination flange. Only PVC C-900 DR 14 and ductile iron shall be used for the fire line service. The
fittings shall be mechanical joint type. The tapping valve, PIV, and all other fittings and pipe shall be
marked to withstand 200 p.s.i.
(a) If the fire line and water service are on one line,the domestic water service shall have the
take off so that the domestic service will have a curb stop and stop box at the property line.If a
PIV is required,the domestic service will branch off prior to the PIV and have a curb stop and
Attachment A
stop box adjacent to the PIV. The take off for the water service shall be either brass, ductile
iron,C-900 PVC DR14,or copper to the curb box.
(b) The curb stop and stop box may be installed at another location with prior approval from
the Authority Having Jurisdiction.
(26) Section 609.12 Pipe Insulation. is deleted in its entirety and the following section is inserted in lieu
thereof."Section 609.12 Pipe Insulation.Insulation of domestic hot water piping shall be in accordance
with the applicable energy conservation code."
(27) Section 610.1 Size,Size of Potable Water Piping,is amended by deleting the words"each water meter
and" from the first sentence and adding "Water meter sizing shall be determined by the Water Meter
Division"to the end of the section.
(28) Table 610.4 Fixture Unit Table for Determining Water Pipe and Meter Sizes is amended by
deleting footnote 2 and inserting the following in lieu thereof: "Building supply,one(1)inch nominal
size minimum."
(29) Section 610.8 Size of Meter and Building Supply Pipe Using Table 610.4 is amended by adding the
following exception.
"Exception:Where a single water service line provides service to a new duplex or is split for any other
reason, the service line shall be at least one inch in diameter. Where an existing structure is to be
converted to a duplex a 1" equivalent service may be provided by a separate tap. The new service lines
shall be divided by a wye at the property line. Existing 1" services may be split inside the building so
long as shut-offs are available in a common area. Separate curb boxes shall be installed,and separate 3/a
inch service lines shall be run to the individual customer units."
(30) Section 610.8(6)Size of Meter and Building Supply Pipe Using Table 610.4 is amended by deleting
the last sentence and inserting the following in lieu thereof: "No building water service line shall be
less than one(1)inch diameter."
(31) Section 611.4 Sizing of Residential Softeners.is amended by adding the following to the end of the
last sentence in the section: "or as specified in the manufacturer's installation instructions."
(32) Section 612 Residential Fire Sprinkler Systems.is amended by deleting sections 612.0 through
612.7.2.
(33) Table 702.1 Notes.Note#8.is amended by adding the following at the end of the footnote: "Public
use shall be any building or structure that is not a dwelling unit.Fraternities and sororities are not
classified by this section as a dwelling unit."
(34) Table 702.1 Notes. Note#9.is amended by deleting"a maximum shower size of 36 inches(914 mm)
in width and 60 inches(1524 mm)in length"and inserting the following in lieu thereof. "showers
having only one shower head rated at a maximum of 2.5 gpm."
(35) Section 703.1 Minimum Size,Size of Drainage Piping,is amended by adding the following at the
end of the section: "No underground drainage piping or vent shall be less than two(2)inches inside
diameter."
Attachment A
(36) Section 704.3 Commercial Sinks is deleted in its entirety and the following section inserted in lieu of:
Section 704.3 Commercial Sinks."Pot sinks,scullery sinks,dishwashing sinks, silverware sinks,and
other similar fixtures shall have an airgap indirect waste connection to a properly trapped and vented
floor sink. Commercial kitchens must have at least one floor sink with a three-inch waste line serving
the main scullery sink."
(37) Section 710.1 Backflow Protection.is amended by adding the following sentences to the end of the
section: "The requirement for the installation of a backwater valve shall apply only when determined
necessary by the Authority Having Jurisdiction based on local conditions.When a valve is required by
the Authority Having Jurisdiction,it shall be a manually operated gate valve or fullway ball valve.An
automatic backwater valve may also be installed but is not required."
(38) Section 715.2 Joining Methods and Materials is amended by adding the following exception: "No
molded rubber coupling shall be used on any sanitary sewer or storm sewer.Appropriate stainless steel
shielded molded rubber couplings may be used as connections when connecting sanitary or storm
sewers. Single band shielded couplings(no hub clamps)are not allowed on any exterior building
sanitary sewer,or storm sewer."
(39) Section 717.1 General, Size of Building Sewers. is amended by deleting the first paragraph and
inserting the following in lieu thereof."The minimum size of any building sewer shall be determined on
the basis of the total number of fixture units drained by such sewer, in accordance with Table 717.1
Maximum/Minimum Fixture Unit Loading on Building Sewer Piping. No building sewer shall be
smaller than four(4)inches.The building sewer shall not be smaller than the building drain.
With prior approval from the Building Official, a sewage ejector may discharge the building sewer to
the public sewer manhole when the public main is too shallow to allow the building sewer discharge to
flow by gravity. The pipe material to be used shall be Polyethylene (P.E.) Two (2) inch SDR 7, 3408.
The two(2)inch line shall at all times be a minimum of five(5)feet deep or freeze protection is required.
The sewage ejector shall be vented with a minimum two(2)inch pipe."
(40) Section 718.2 Support. is deleted in its entirety and the following section inserted in lieu thereof.
"Section 718.2 Support.Building sewer pipe made of cast iron,copper,or extra strength vitrified clay
shall be laid on a firm bed.Pipe consisting of Schedule 40 PVC/ABS,PVC SDR 23.5/35 and PVC truss
pipe shall be enveloped on bottom, sides and top with a minimum of four(4) inches of either one (1)
inch clean or 3/8"minus crushed rock,3/8"washed chip or"pea gravel'.After enveloping the pipe,the
remainder of the ditch may be filled once the inspection is complete."
(41) Section 719.6 Manholes is amended by deleting the second paragraph.
(42) Section 807.3 Domestic Dishwashing Machine. is deleted in its entirety and the following section is
inserted in lieu thereof: "Section 807.3 Domestic Dishwashing Machine. No domestic dishwashing
machine shall be directly connected to a drainage system or food waste disposer without the use of an
approved dishwasher air gap fitting on the discharge side of the dishwashing machine,or without looping
the discharge line of the dishwasher as high as possible near the flood level of the kitchen sink where the
waste disposer is connected. Listed air gap fittings shall be installed with the flood level (FL)marking
at or above the flood level of the sink or drainboard,whichever is higher."
(43) Section 814.5 Point of Discharge.is deleted in its entirety and the following section is inserted in lieu
thereof: "Section 814.5 Point of Discharge.Air-conditioning condensate waste pipes shall connect
indirectly to a properly trapped fixture,floor drain,or open sight drain,or where permitted in Section
Attachment A
814.6,to the drainage system through an air gap or air break to trapped and vented receptors,dry wells,
leach pits,sump pump,the tailpiece of plumbing fixtures or indirectly to the building storm sewer
through a roof drain.A condensate drain shall be trapped in accordance with appliance manufacturer's
instructions or as approved."
(44) Section 901.1 Applicability.is amended by adding the following sentence to the end of the section:
"No engineered single-stack drainage systems shall be installed."
(45) Section 901.2 Vents Required.is amended by adding the following at the end of the section:
"All single-family or two-family dwelling units with a basement shall be provided with a two (2) inch
future vent.The future vent shall be combined with other vents or terminate through the roof. Such vent
shall be capped in the floor joist area of the basement for future use.The two(2)inch vent is for a future
basement bathroom or other approved fixtures."
(46) Section 906.1 Roof Termination.is amended by deleting the last sentence.
(47) Section 906.7 Frost or Snow Closure.is amended by deleting"two(2)inches(50.8mm)"in the first
sentence and inserting"three(3)inches(76.2 mm)"in lieu thereof.
(48) Section 908.2.2 Size.is amended by deleting the second sentence in this section and inserting the
following new sentence in lieu thereof. "The wet vent shall be not less than two(2)inches(50 mm)in
diameter for six(6)drainage fixture units(dfu)or less,and not less than three(3)inches(80 mm)in
diameter for seven(7)dfu or more."
(49) Table 1002.2 Horizontal Lengths of Trap Arms is amended to read as follows:
Table 1002.2
Horizontal Lengths of Trap Arms
(Except for Water Closets and Similar features)',Z
Trap Arm Diameter Distance trap to vent Length Maximum
(inches) Minimum(inches) (feet)
1-1/4 2-1/2 5
1-1/2 3 6
2 4 8
3 6 12
4 8 12
Exceeding 4 2 x Diameter 12
For SI units: 1 inch=25.4 mm
Notes:
1 Maintain'/a inch per foot slope(20.8 mm/m).
2 The developed length between the trap of a water closet or similar fixture
(measured from the top of the closet flange to the inner edge of the vent)and its
vent shall not exceed 6 feet(1829 mm).
(50) Section 1007.1 Trap Seal Protection. General.is amended by deleting"not deemed
necessary for safety or sanitation by the Authority Having Jurisdiction"and inserting the following in
lieu thereof: "floor drains or similar traps that receive a liquid discharge year-round."
Attachment A
(51) Section 1014.1.3 Food Waste Disposers and Dishwashers.is amended by deleting the second
sentence and inserting the following in lieu thereof "Commercial food waste disposers shall discharge
into the building's drainage system in accordance with the requirements of the Authority Having
Jurisdiction."
(52) Section 1101.6.2 Sump.is amended by replacing"fifteen(15)gpm"with"17 gpm with a 17-foot
head"and adding the following to the end of the section: "The sump pump line may be either Schedule
40 PVC or Schedule 80 PVC pipe. The fittings shall be either schedule 80 PVC deep socket or
schedule 40 deep socket pressure fittings.The sump pump line may also be 1 'h"polyethylene(PE)
SDR 9,3408.The PE joints shall be made with ribbed insert fittings secured by stainless steel clamps.
The sump line shall be buried no less than five(5)feet in depth from finished grade.If this depth
cannot be maintained,freeze protection shall be provided.When the sump line is discharged into a
storm manhole,intake,or storm main that is not five(5)feet below final surface grade,a quarter('/a)of
an inch hole shall be drilled into the bottom portion of the horizontal 90°elbow before pipe is placed in
the vertical position.
If two sump lines are combined together,the sump line shall be a two(2)inch line to the storm main,
intake,or manhole. The sump pump shall have an electrical outlet within reach of the manufacturer's
cord.
No foundation drain service line shall be discharged onto property,someone else's property,or into the
building drain or building sewer.No floor drain,clothes washer,or any other plumbing fixture shall be
discharged into the foundation sump pit.
Every sump pit in an elevator shaft shall meet the rules and regulations as required by the State of Iowa
for elevators.No hydraulic elevator sump shall be discharged into a storm or sanitary sewer."
(53) Section 1101.6.3 Splash Blocks is deleted.
(54) Section 1101.6.5 Open Area is deleted.
(55) Sections 1205.0 through 1205.2 Authority to Render Gas Service.are deleted.
(56) Sections 1207.0 and 1207.1 Temporary Use of Gas.are deleted.
(57) Section 1208.6.4.5 Corrugated Stainless Steel Tubing.is deleted in its entirety and the following
section is inserted in lieu thereof. "Section 1208.6.4.5 Corrugated Stainless Steel Tubing.Only
CSST with an arc-resistant jacket or covering system listed in accordance with ANSI LC-1 (Optional
Section 5.16)/CSA 6.26-2016 shall be installed,in accordance with the terms of its approval,the
conditions of listing,the manufacturer's instructions and this code,including electrical bonding
requirements in Section 1211.2.CSST shall not be used for through-wall penetrations from the point of
delivery of the gas supply to the inside of the structure. CSST shall not be installed in locations where
subject to physical damage unless protected in an approved manner."
(58) Section 1211.3 Arc-Resistant Jacketed CSST.is deleted.
Attachment B
Existing Code with Proposed Deletions and Additions
by the ifftemp ioffal Code Gotmeil,lae., as adopted and amended iff this eode,shall apply to the installa4ion, ,
repair- and replaeemen4 of mechanioal systems, including equipmen4, applianees, fixtures, fittings and/of
appurte
s, ineluding ventilating, heating, eooling, air conditioning and refrigeration systems, ineinerators an
other energy rela.oa systems,
Exceptione One and two family dwellings shall eomply with the 2015 in4ernational Residential Co
Sec.5.100(11)Mechanical.Delete this section in its entirety and replace with the following
(11) Mechanical. The provisions of the International Mechanical Code (IMC) 2021 Edition, published by the
International Code Council, 4051 West Flossmoor Road, Country Club Hills, IL 60478, are hereby adopted by
reference with amendments as the City of Ames Mechanical Code.
Systems,(12) Plumbing. The pr-ovisiens of the Uniform Plumbing Code (UPC) 2015 Editien published by the
international Association of Pltmibing and Meehanioal Officials, v� the addition of Appendix A Recomme
Rules for Sizing the Water Supply System,Appendix B Explanatory Notes on Combination Waste and Vent
system,Appendix C Alternate Pitmibing Systems(at the discretion of the A14j),and Appendix D Sizing Ster-M Water Drainage
Systems,are hereby adopted and designated,together with and subjeet to the additions, deletions, and modifications
hereinafter stated in the amendmen4s to this eode, shall apply to the installation, alteration,repair-and replaeement of
plumbing systems,ineluding equipment, appliamees,firittwes,fittings a-ad appw4eaaaees,all aspeets of a medieal gas
and fuel gas piping.
Sec.5.100(12)Plumbing. Delete this section in its entirety and replace with the following
(12) Plumbing.The provisions of the Uniform Plumbing Code(UPC), Sections 101 and 102 and Chapters 2
through 17 of the Uniform Plumbing Code,2021 Edition,as published by the International Association of Plumbing
and Mechanical Officials,4755 E.Philadelphia Street,Ontario,California 91761-2816,are hereby adopted by
reference with amendments as the City of Ames Plumbing
(13) Gas. The pr-ovisiens of the laternational Fuel Gas Code (IF-GC) 2015 Editien p4lished bY the
intemational Code Couneil, ine., as adopted and amended in this eode, shall apply to the ifistallation of gas piping
and opermien of residential and eemmefeial gas applianees and related aeeesser-ies.Exeeption: One and two family
dwellings shall eomply with the 2015 in4ernational Residential Code.
Sec.5.100(13)Gas. Delete this section in its entirety and replace with the following
(13) Gas.Fuel gas piping shall comply with the requirements of Chapter 12 of the Uniform Plumbing Code,2021
Edition, as published by the International Association of Plumbing and Mechanical Officials, 4755 E. Philadelphia
Street, Ontario, California 91761-2816 and adopted by the City of Ames with amendments, unless the provisions
conflict with the Iowa Administrative code (IAC) 661-Chapter 226, Liquified Petroleum Gas. Where Chapter
12(2021UPC)conflicts with 661-chapter 226(IAC,),the provisions of Chapter 226 shall be followed.
Attachment B
See.5.206. MECHANICAL.
The provisions of the 2015 international Mechanical Code(IMC),are amended as fol
(5) Seetion 106.4.8 Posting of permit is deleted.
Section 106.5 Fees is deleted
(7) Seetion 106.5.1 Work eommeneing before pumit issuance is amended to read"Any per-son who
commences work on a mechanical system befoFe obtaining the neeessary permits may be subjeet to 100 pereen4 of th-e
usual peffnit fee in addition to the required pefmit fees."
(-9) Seetion 106.5.2 Fee sehedule is amended to read"The fees fef meehanical wofk shall be indiea4e
in Appendix U of AfnesMunieipal Code-.--'
Seetion 108.4 Violation penalties is deleted,
Seetion 108.5 Stop work orders is deleted.
42-)�) Section 109 Al.ans of Appeal.,n ., iate] subsections is deleted.
Seetion 2 Alembrane Penetrations is amended by adding the following •
Exception; Duet systems construeted entirely of mininwm 0.0187 inch thiek steel(No. 26 gauge) shall be allowe A.
without installation of radiation dampers.
Section 5.206 MECHANICAL.Delete Section 5.206 in its entirety and insert the following in lieu o£
Section 5.206. MECHANICAL.
The adopted provisions of the 2021 International Mechanical Code(IMC),are amended as follows:
(1) Section 101.2 Scope.is amended by deleting the words `by the International Fuel Gas Code' in the last
sentence and inserting the following in lieu thereof: `by Chapter 12 of the UPC as stated in Section
5.10003)of this Chapter'.
(2) Section 101.2 Scope. is amended by deleting the words `Exception: Detached one- and two- family
dwellings and townhomes not more than three stories above rg ade plane in height with a separate means
of egress and their accessory structures not more than three stories above grade plane in height shall
comply with this code or the International Residential Code."
(3) Section 304.11 delete the exception and inserting in lieu thereof the following new exception:
Exception: Guards are not required where permanent fall arrest/restraint anchorage connector devices
that comply with ANSI/ASSE Z 359.1 are affixed for use during the entire lifetime of the roof
covering.The devices shall be evaluated for possible replacement when the entire roof covering is
replaced.The devices shall be placed not more than 10 feet(3048 mm)on center along hip and ridge
lines and placed not less than 10 feet(3048 mm)from roof edges and the open sides of walking
surfaces.
(4) Section 306.1 Access. Delete the last sentence and inserting in lieu thereof. "An unobstructed level
working space at least 30 inches deep and 30 inches wide shall be provided on any side of equipment
where service access is required.The authority. by avingjurisdiction may approve service reductions
prior to equipment installation,provided that the manufacturer's instructions are met."
(5) Section 306.2 Appliances in attics. Delete this section in its entirety and insert in lieu thereof the
following new section.Appliances in rooms and closets.Rooms and closets containing appliances
shall be provided with a door and an unobstructed passageway measuring not less than 36 inches wide
Attachment B
and 80 inches high. A level service space not less than 30 inches deep and 30 inches wide shall be
present at the front service side of the appliance with the door open.
(6) Section 306.5. Equipment and appliances on roofs or elevated structures.Is amended by adding
the following to the end of the section: "If the tenants of a multiple tenant building have,or are allowed
to have,mechanical facilities on the roof or which penetrate the roof,then roof access ladders must be
provided for use by all such tenants and their agents and contractors in a manner that does not require
accessing space under the control of another tenant."And deleting the following exception`Exception:
This section shall not apply to Group R-3 occupancies."
(7) Section 306.5.3 insert the following new section: Section 306.5.3 Visual screening of rooftop
equipment.Equipment screening shall not be installed to the rooftop unit or the curb of the rooftop
unit unless specified in the mechanical equipment manufacturer's installation instructions.
(8) Section 401.1 Scope.Delete the section in its entirety and insert in lieu thereof the following new
section 401.1: This chapter shall govern the ventilation of spaces within a building intended to be
occupied.These buildings shall meet either the requirements of ASHRAE Standard 62.1,"Ventilation
for Acceptable Indoor Air Quality,"2019 edition,published by the American Society of Heating,
Refrigeration,and Air-Conditioning Engineers, 1791 Tullie Circle N.E.,Atlanta,GA 30329,or the
requirements contained in this chapter.Mechanical exhaust systems,including exhaust systems serving
clothes dryers and cooking appliances;hazardous exhaust systems;dust, stock,and refuse conveyor
systems; sub slab soil exhaust systems; smoke control systems;energy recovery ventilation systems;
and other systems specified in Section 502 shall comply with Chapter 5.
(9) Table 4033.3.1.1 Minimum Ventilation Rates: is amended b adding the following footnotes.
i. For gym, stadium, arena(play area) categories of the sports and amusement occupancy. When
combustion equipment is intended to be used on the playing surface, additional dilution ventilation
and/or source control shall be provided.
L For ventilation purposes,"smoking"includes both combustible tobacco products and accessories
and electronic smokine devices and accessories.
(10) Section 504.9.2 Duct installation. Delete section 504.9.2 in its entirety and insert in lieu thereof the
following new section:504.8.2 Duct installation.Exhaust ducts shall be supported at 4-foot(1219 mm)
intervals and secured in place.The insert end of the duct shall extend into the adjoining duct or fitting in
the direction of airflow. Ducts shall not be joined by screws or similar fasteners that protrude into the
inside of the duct.
(11)Section 506.3.13.3 delete section 506.3.13.3 in its entirety and insert in lieu thereof the following new
section: 506.3.13.3 Termination location.Exhaust outlets shall be located not less than 10 feet(3048
mm)horizontally from parts of the same or contiguous buildings,adjacent buildings and adjacent
property line and shall be located not less than 10 feet(3048 mm)above the adjoining grade level.
Exhaust outlets shall be located not less than 20 feet horizontally/vertically from or not less than 5 feet
above air intake openings and operable doors and windows into any building.
(12)Section 507.3 Type II Hoods. Replace the first sentence in its entirety with the following sentence:
"Type II hoods shall be installed above dishwashers capable of heating water beyond 140 degrees
Fahrenheit and appliances that produce heat or moisture and do not produce grease or smoke as a result
of the cooking process,except where the heat and moisture loads from such appliances are incorporated
into the HVAC system design or into the design of a separate removal system."
(13)Section 508.1.1 Makeup air temperature.Delete section 508.1.1 in its entirety and insert in lieu thereof
the following section. Section 508 .1.1 Makeup air temperature. All kitchen makeup air systems
shall be verified by a certified TAB (testing and balance) contractor to heat makeup air to within 10
degrees of room temperature set point.The TAB contractor shall be certified by NEBB,TABB,or other
certifying organization as approved by the Authority Having Jurisdiction.
(14)Section 601.5 Return air openings. Is amended by adding the following two additional requirements
for return air openings.
Attachment B
9. Return air openings shall be located at least 18 inches from supply air openings. Air throw shall
be directed away from return air openings to reduce short cycling of air. Exception: Factory-made
concentric duct terminations.
10. One return air opening per floor is required on a central duct return system per ACCA Manual
D, Appendix 8. Return air transfer openings are required on all bedrooms when dedicated return air
openings are not used.
(15)Section 603 Duct Construction and Installation.603.1.1 Duct location.Air plenums and ducts located
in floor and wall cavities shall be separated from unconditioned space by construction with insulation to
meet energy code requirements. These areas include but are not limited to exterior walls, cantilevered
floors,and floors above garages.
(16)Section 604.3 Coverings and linings. Delete section 604.3 in its entirety and insert in lieu thereof the
following new section: 604.3 Coverings and linings.Duct coverings and linings,including adhesives
where used,shall have a fame spread index of not more than 25 and a smoke-development index of not
more than 50,when tested in accordance with ASTM E84 or UL 723,usingthe he specimen preparation
and mounting procedures of ASTM E2231.Duct coverings and linings shall not fame, glow,smolder
or smoke when tested in accordance with ASTM C411 at the temperature to which they are exposed in
service.The testing temperature shall not fall below 250°F(121°C).Coverings and linings shall be
listed and labeled. The use of an air gap to meet R-value requirements for duct insulation shall be
prohibited.
(17)Section 607.6.2 Membrane Penetrations is amended by adding the following exception: Exception;
Duct systems that originate and terminate entirely within one dwelling/sleeping unit and are constructed
entirely of minimum 0.0187 inch thick steel (No. 26 gauge) shall be allowed without installation of
radiation dampers.
(18)Section 607.6.2.1.3. Insert the following new section 607.6.2.1.3 Access. Access to ceiling radiation
dampers shall be provided with an approved means of access that is large enough to permit inspection
and maintenance of the damper and its operating parts. Dampers equipped with fusible links, internal
operators for both shall be provided with either an access door that is not less than 12 inches(305mm)
square,or a removable duct section.
(19)Section 607.6.2.1.4. Insert the following new section 607.6.2.1.4 Identification of access. Access to
ceiling radiation damper locations and access points shall be permanently identified on the exterior by
label or marking acceptable to the authority. having jurisdiction.
See:5.20 GAS.
The provisions of the 2015 international Fuel Gas Code(IFGC),are amended as folio
0) Seetion'�reFwAts and asseeiated subseetiens is deleted.
(2) Section'miens and associated s4seetiens is deleted.
(3) Section 109 Means Of ^c-al and associated subsections is deleted.
Section 5.208 PLUMBING.Delete Section 5.208 in its entirety and insert the following in lieu thereof:
Sec.5.208. PLUMBING.
The provisions of the 2415 2021 Uniform Plumbing Code (UPC), are amended with the addition of Appendix A
Recommended Rules for Sizing the Water Supply System, Appendix B Explanatory Notes on Combination Waste
Attachment B
and Vent Systems, Appendix C Alternate Plumbing Systems (at the discretion of the AHJ), and Appendix D Sizing
Storm Water Drainage Systems,and the revision of the following text as stated:
(1) Section 102.4.1.1 Building Demolition stating:
Whenever a structure or building is to be demolished,before demolition begins the following must be completed:
(a)Building sewer capped at curb line with a manufactured plug.
(b)Foundation line capped at curb line with a manufactured plug.
(c)Water service capped or plugged at main.
(d)Plumbing inspector sign-off on demolition sheet given to contractor before demolition permit is
issued.
(2) Section 102.9 Annexed Building stating:
When a structure or building is on land that has been or is being annexed into the City of Ames and connection to the
public water or sewer system is requested for that building or structure,the City may require that its plumbing system
be inspected to determine whether the system has adequate sewer venting and backflow prevention to protect the
public water system, and to determine if it is otherwise free from hazards to those exposed or potentially exposed to
that system. Based on that inspection, if it is determined that a cross connection or other hazard exists, then the
Building Official shall determine what corrective action is needed to eliminate the hazard(s) and the owner shall
complete the corrective action before connection to City services is allowed.
(4) Seetion 104.4.1 Approved Plans or-Gansti=uetien Daeumef4s-is-deleted.
(5) Section 104.4.3 Expiration is deleted.
«' Section 104 -6-Retention of Plans is deleted.
(7) Seetion 104.5 Fees is amended to replace reference to Table 104.5 with Appendix U of the City of
Ames Municipal Code.
(8) Seetion 105.2.6 Reinspeetions is amended by deleting the last two paragraphs of the section.
(9) Section 106..3 Penalties is deleted.
(10) Seetion 107.0 Board of Appeals and both subseetions is deleted.
(3) Section 301.5 Alternative Engineered Design.is amended b adding the following sentence to the
end of the section: "No engineered single-stack drainage system shall be installed."
(4) Section 309.6 Dead Legs. is amended by adding the following sentence to the end of the section:
"The authority having jurisdiction can determine the method of flushing."
(5) Section 312.6 Freeze Protection. is amended by adding the following at the end of the section:
"Systems requiring protection from freezing shall be buried no less than five(5)feet in depth from
finished grade. If this depth cannot be maintained, the sides and top of pipe wall shall be covered
with 1 ''V?blue board insulation.The sides of the insulation shall be at least five(5)feet in depth."
Attachment B
(6) Section 314.4.1 Installation of Thermoplastic Pipe and Fittings.is deleted in its entirety and a
new section is inserted in lieu thereof: "Section 314.4.1 Installation of Thermoplastic Pipe
Fittings.Trench width for thermoplastic pipe shall be limited to six times the outside diameter of
the piping at the base.Thermoplastic piping shall be bedded in not less than 4 inches(102 mm)of
aggregate bedding material supporting the pipe. Initial backfill shall encompass the pipe.
Aggregate material shall be three-ei hg the(,3/8)inch n-gravel or 1-inch clean class one bedding._
(7) Section 402.5 Setting.is amended b adding the following sentence to the end of the section that
begins"Exception:":"Sanitary napkin receptors are not dispensers and shall not be within the
clear space of the water closet."
(8) Section 407.3 Limitation of Hot Water Temperature for Public Lavatories.is amended by
adding the following sentence to the end of the section: "These devices shall be installed at or as
close as possible to the point of use."
(9) Section 408.3.2 Temperature Limiting.
(1)Amend this section by adding the following to the end of(3): "and installed at or as
close as possible to the point of use."
(2)Amend this section by adding the following to the end of(5): "may be used
downstream of other allowed device. TAFR valves are not intended to be installed in
place of devices complying with ASSE 1016,ASSE 1017,ASSE 1066,ASSE 1069,or
ASSE 1070."
(10) Section 408.0 Showers.is amended by adding a new subsection: "Section 408.11 Shampoo
Bowls and Grooming Stations.Limitation of Hot Water Temperature of Hair Shampoo Bowls
and Pet Grooming Stations. The maximum hot water temperature discharging from hair shampoo
bowls and pet grooming stations shall be limited to 120T(49°C).The maximum temperature shall
be regulated by one of the following means,which shall be installed at or as close as possible to
the point of use:
,,G)A limiting device conforming to ASSE 1070,ASME Al 12.1070,CSA B125.70,or
CSA B 125.3.
"(2)A water heater conforming to ASSE 1084."
All wa4ef eloset bowls shall be of the elofiga4ed t5Te with epen ffeft4 sea4s exeept in dwelling tMits
height suitable for children's use.All water closets shall be equipped with seats as required below.
(11) Section 409.4 Limitation of Hot Water in Bathtubs and Whirlpool
Bathtubs. is amended by adding the following sentence to the end of the section: "These devices
shall be installed at or as close as possible to the point of use."
(12) Section 410.3 Limitation of Water Temperature in Bidets.is amended by adding the following
sentence to the end of the section: "These devices shall be installed at or as close as possible to the
point of use."
Attachment B
(13) Section 416.5 Drain.is amended by deleting the last sentence,which states: "Where a drain is
provided,the discharge shall be in accordance with Section 811.0."
(14) Section 418.3 Location of Floor Drains is amended by adding section 418.3(5)as follows:In all
buildings,a three-inch(3")floor drain shall be located on the lowest floor level and where the
water meter is located.A three-inch(3")or larger floor drain shall be located in same room where a
reduced pressure principal backflow prevention assembly is installed that discharges water.A two-
inch(2")or larger floor drain shall be provided in the same room the water heater is located on the
lowest floor level.
Exception: Existing water heaters and water meters unless relocated.
(13) Table 422.4 Minimum Plumbing Vneilities is amended by adding the fellowing�.
(15) Section 422.1 Fixture Count.
(1)Modify the section by deleting the first paragraph and inserting the following in lieu thereof:
"Plumbing fixtures shall be provided in each building for the type of building occupancy and in
the minimum number shown in Table 2902.1 and its associated foot notes of the 2021
International Building ode.
Required public facilities shall be designated by a legible sign for each sex. Signs shall be readily
visible and located near the entrance to each toilet facility."
(2)Modify the section by deleting the second paragraph and inserting the followingin n lieu
thereof:
"The minimum number of fixtures shall be calculated at 50 percent male and 50 percent female
based on the total occupant load.Where information submitted indicates a difference in the
distribution of the sexes,such information shall be used to determine the number of fixtures for
each sex. Once the occupancy load and occupancy are determined,Table 2902.1 shall be applied
to determine the minimum number of plumbing fixtures required.When gender-neutral restrooms
are provided,the total number of fixtures provided must be the sum of men's and women's
fixtures as figured,and urinals in gender-neutral restrooms shall not be substituted for more than
67 percent of men's water closets in assembly and educational occupancies or 50 percent of men's
water closets in all other occupancies.Where gender-neutral fixtures are provided in addition to
separate men's and women's facilities,those gender-neutral fixtures shall be included in
determining the number of fixtures provided in an occupancy.Where applying the fixture ratios in
Table 2902.1 results in fractional numbers,such numbers shall be rounded to the next whole
number.For multiple occupancies,fractional numbers shall be first summed and then rounded to
the next whole number.
(16) Section 422.1.1 Family or Assisted-Use Toilet and Bathing Facilities.
Modify the section by adding the following sentence to the end of the section: "Required family or
assisted-use fixtures are permitted to be included in the number of required fixtures for either the
male or female occupants in assembly and mercantile occupancies."
(17) Table 422.1 Minimum Plumbing Facilities.Delete the table
Attachment B
(18) Section 422.2 Separate Facilities.Modify this section by adding an Additional exception:
"(4) Separate facilities shall not be required where rooms having both water closets and lavatory
fixtures are designed for use by any gender and sufficient privacy for water closets is installed.
Partitions or compartment walls shall extend from no more than 1 inch from the floor to no less
than 84 inches from the floor.Urinals shall be located in an area visually separated from the
remainder of the facility or each urinal that is provided shall be located in a stall."
(19) Section 422.6 Substitution for Water Closets.Insert the following new section: "In each
bathroom or toilet room,urinals shall not be substituted for more than 67 percent of the required
water closets in assembly and educational occupancies.Urinals shall not be substituted for more
than 50 percent of the required water closets in all other occupancies. (Reprinted from the 2018
International Plumbing Code section 424.2)"
senteftee and inse4ing the following in lieff thereof--.
in food establishments the fixture requirements may be determined by the statutes and regula4ions of the
State of lowa.The following re"irements apply to food establishments,bars and nigM(14) Seetion 422.3 FixtuFe Requirements for Special Occupaneies is amended by replacing the last.
(a)Bafs,ta-vems and aigh4elubs shall be pr-ovided A4th a thfee(3)eompa#mefit glass washing sink an
dr-ain beafd with hot and eold t%ooiag water, The sink shall have an indir-eetwaste with a-a air-gap to a floor-sin-k
with a 3"tr.,
washing maehine of eeffimer-eial type,ineluding a booster-heater aloagA4th a two eampaftment(b)A r-estaufa*t shall have either-a three (3) eofftpai4meat ware washing sink or-an awmatie dish
sink.(e)A hand washing sink with hot and cold rwming water shall be installed in each food preparation
area in restaurants and behind each bar area of bars,tavems and nightclubs.
(d)A mop/titility sink shall be required with hot and cold running water in each restaurant,bar,taver
or nightolub,for mop and waste water.The mop/titility sink shall not be used as a hand washing
(20) Seetion 603 C-rOss-Conneetion ContFol is amended ash le�Psi
(a)Seetion 603.2 APPFOVHI of Deviees oF Assemblies is amended by deleting the last sefi4enee a-ad
inserting the fellewing in lieti ther-eef, "Testing or-maifftena-nee shall be performed by a registered bae4low assembly
tester approved by the A„the fity Having T„fisd et;on"
(b) Section 603.4.2 Testing is amended by deleting the text and inserting the following in lie
(i) The premise owner or responsible paFty shall have the baeki &A,pfeven4ioa asse
tested by a registered tester-M the time of installmion,r-epaif,of r-eleea4iea a-ad not less
than on an annual sehedule thereafter-, or more often when required by the Authority
Having T di ling shall b F .l .l 'tl,
�r'c'niSd�F.ti9n. �e-1.1-9ca�t€Scrrc�3rnrrc�pciivinxcaz'rrricccvr�zincc�r"rcn
procedures—approved bythe Administfative Authority. The Author;t�ng
Jurisdiction may establish the annual schedule.
(4) Baekflow prevention assemblies which are in place,but have been out of service fo
mofe than three months,shall be tested before being pu4 baek in4o ser-viee. Bael-44eA
proventien asseffiblies used in seasonal applieations shall be tested before being pu
,t epefmioa eaeh season,
047 .,The Ather;ty l4aying T„r;s,ietion m o ..,lie lly yefi fy test pr-eeedufes and
C'�` results.
Attachment B
{i-} When war-ranted,the Authority Having jurisdiction may require baekflow preven4ion
assemblies to be tested at any time in addition to the annual testing re"irement.
Examples of this inelude,but are not limited to,assemblies with a history of repeated
failures o assembliesflood,tha41 ., ,
wye been ubjeete to fire, o other„ usti.1
effi,irefffnen4alrdit
f
,..,.1y to the eustomer and to the A..ther-;r..L7..ying i..r;s,,ieti.« .. ., F r.m.
shall immediately report to the Authority Having itirisdietion when and where a test
indioates that an assembly fails to meet standards and no immediate repair is done to
make the assembly meet standards.
Before being placed back in4o service,any baekflow prevention assembly w-hieh fails
a test shall be repaired or replaeed. in the case when a reportedvalue th-An the
the Di fe ter of the City of A fnes lx a4ef a-a Pollution Gofit.,.,rlepa f.. ent
may appreve tempofafy rester-atien of sefviee.,,
(-a) Seetion 603.4.8 Drain Lines is amended inserting at the start of the seetion the
fbllov�4ng: "Provisions shali be made to convey the diseharge of water from any redueed pressure prineiple
1 aekfl.,w prevention assembly(DD)+..., suitable drain."
over- (b) Seetion 603.4.9 Prohibited Locations is amended by adding at the end of the seetion th-e
baeldqow pr-evei-Aieo device shall be installed in a plaee w-hefe it would er-ea4e a safiaty hazard stleb as,btA not
lifnited to,
follows: (d) Section 603.4 GeneFal RequiFements is amended by adding a new Seetion 603.4.10 Repairs
as
!;l All ro s to L.aek low prevention assemblies shall 1.e per-C r.. a by ro istero.,
baekflow preven4ion assembly testers.
( ) The testef shall not ehange the design,material,of opefational ehafaetefisties of
only original manufactwer replaeement parts or equivalent parts approved by the
University of Southern Foundation for Cress Conneetion Co xtfoli--can
Hydraulic Resear-oh.
eustemeF and cv the rcdui^oiicy Having aaiiSaicciollwithin ten weCElnsdays. The
tprtr
section a new seetion 603.10 as follows:
the possibility of eeii4amiamioa or pollt4ioa by eontaining within the eustofner2s
(e)Seetion 603.0 Cross Conneetion ContFol is fiwther-amended by adding af4er the last numbered
and
systeniatioallyande otively prevent the eon4amination or pollution of the P
(ii)Definitions.As used in this section:
a.ApprovedBackflow Prevention Assembly For Containment A 1 ackflow
Attachment B
Foundation for Cress Connection Control and Hydraulic Research. The 1..,ckfi lA,,
prevention assembly must also be listed by the international socialflo" of
Pl,,.ti.bing and Niechanieal Offlleials,-or by the Ameriean Soeiety--o-Sanitary
Engineering.The appr-oval and listing r-e"ir-emeats de net apply to a-a air-ga-p used
as an approved baekilow pr-evefftion assembly for-eontainment.
h. A axilia fy .1 tei-- Supply nea-as� A-ny-sei rEefwater that is-available-te the
eustemer over-whieh the City of Ames water-t4ility does not ha-ve saaitai=y eontrol
> eentamination, o
..,tor„«.,,eeptable., a potable..,.,tor supply, such as,but not limited to
1 a publie o private....,tor supply other than the City of Ames ,.,tor„til:�.,
3. lakes,natuf llyed ponds, storm water basins, and flowing waters (rivers,
oeks ete)from w-hieh ,.,tor is drawn.
use,or-dir-eet the use e ,
or-other-affangement for-eontFol.
d.Baekflew-meaias: The tmdesi-r-abie re er-sal of flow into the publie water-
distfibutio system.
e. Baeh#low Prevention ssembly means: assembly-or means to preven
b
1.Air Gap means: This is a physieal break between the PWS and the eusto
water system. The air gap is to ereate an unobstrueted vertieal distanee betwee
the opening of any pipe r F u tot eonveying ..,ter to ., tank ,.1,,,,,.bing fixtffo
ieeepter-,or-other-asseff'i>ly and the igood level of ther-eeeptaele.The air-gap shall
eonfor—r-te the ry"irefnei4 of cif UPC Table 603.3.4 Min;mum A;,.gapS fO
2.Reduced-Drrressaie Principle B3.6kf4ow Preyei}tien Assembly R )fneans:TThe
RP eonsists of two-=mRepeidepAlly acting ekeek valves together with--tea
valve located between the cheek valves. These units are loeated between two
tightly closing resilien4 seated valves as an assembly,and equipped with proper4y
1.,eate.l resilient seated test shute ff-
3.Double Cheek Valve Assembly(DC)means: The DC consists of two in4er-nally
leaded eheek valves,either-spring leaded er internally weighted,installed as a uni
between two tightly elesing fesilief4 sea4ed sWtoff valves with pfoper-ly leeate
s:liefA sea4e.l test shtAo ff-
F rner-Eia i,�stn al Fluid rneaisA 1• ,:,
gas, or etien t is-a
supply,would constiWte a hazard(health or non health)if introdueed into the publie water
stieh as,
but not lifnited-to
1 polluted o ..«t.,,v mate waters;
7 all t.Tes of process and used waters!,...,tors...1.;ch originated from the
p4lie water supply but may have deteriorated: sanitary quality);
3. eheffiieals in fluid ,
5. eifeulated Eeeliag waters(exeept or those solely used or air
eenditiening);
gases,
Attachment B
7.other lig„'— dgaseous fluids used industrially, agricultural
commercially,
or for other non domestic purposes.
9Cemnereial4n ustrial Fluid System means: Any system used by the
i. ear washes,
z.
br
es,
chlorinators,3.
4. elo in pl o ste
S. bulk fluid steragewith remote dispensing(motor oil,antifireeze,
ete
6. injeetion molding with integral heating and cooling. ,
eoffffriereial,liodustFial fluid" .ster s do not: elude!
systems;i. fuel gas(propane or natural gas)
z. air eeaQitiea;ag,eooling, refrigeration, and sear systems
using only Freon o similar refrigerants;
3. sanitafy sewer,r "ter or st .�.r sewer-line and
4. boiler-,.
n.
Containment means: A method of baekflow preven4ion which r
the installation of a baddlow prevention assembly at the wa4er ser:viee connection.
i. C,,..r.,.v.:,,.atio,,. means: An impairmen4 of., potable water supply by the
intr-oduetion or admission of any foreign substanee that degrades the quality of the water and oreates a healt
ham
J• Gross Copmeetion means!
system.part of a potable water system and any other ewvironment con4aining other substances in a manner that, under any
circumstances,would allow such substances to enter the potable water
1E. Hazard, Degree frneaas� Ther-atin e a-cress-eeffneetienorserviee
connection w-hieh indicates if it has the potential to cause eontamination or pollution. The term is derived from a..
evaWation of the potential risk to p0lie health and the adverse effect of the hazard upon the potable water system.
i. Hazard Health means zard upon the PWS 4volving-any
substance that, if in4roduced in the potable water supply, could ea-use death, illness, spread disease, or have a high
probability of•ea-using such effects.
i. lea-zed Nen health-ffieaasAha—�upon the PAIS involving
Attachment B
h gernia ent Swimming Pool means: A pool or tub with a capacity o
1,000 gallons or more of chemically treated water that has a filtration system with a pump and rigidly supported
walls/sides.Above grotmd movable pools and tubs that meet the above criteria shall be deemed"permanent swimming
M. D.,11„tion means: The presence of any foreign sOst.nce in water ♦1.
alters, r degrades its.. ality bu4 does not constitute .,health hazard.
n.
Registered 1?aekflow Prevention Assembly To..l.nicia (To..l.r.:,ian)
means:A per-son who is registered by the State of low-a to test or repair baekflow prevention assemblies and report on
the condition of those assemblies.
e. Service Connection means: The terminal o«a of the pipe conneeted4o,
directly or indirectly,the City of Ames water main;that is,the point of delivery to the customer's water system. 1
meter is installed at the end of the serviee eonneetion,then the service connection shall mean the downstream end of
the meter. Service connections shall also inelude,but not be limited to,a temporary water service connection from a
f4r-e hydrant and all other temporary or-emer-geney water-sen,iee eofmeetioas 47E)m the publie wa4er-systeffl.
P.
Thermal Expansion means: \ ol,,metrie inerease of w for due to heatin
resulting i inereased pressure in a elosed system.
(iii)Administrative Auffiority
a. The Admiaistra4ive AtAhor-ity is the Ames City Council acting
through stieh persons r departments as the City Council shall designate.
b. The tdffiinistrmiveAther-ity shall oe the right to enter,with
the eonsent of the eustomer-or-upon the basis of a suitable warrant issued by a eotH4 of appr-opria4e jufisdietioa, any
property to determine if the conditions for a partial or total exemption ha-ve been satisfied or if a backflow preventi
assembly has been properly installed for containment.
i All 1.aekil..w p i assemblies shall be ., aii ahl„. o 0nto
for-City inspeetion within a short notice by the Admiaistfa4ive Aut4er-ity. Shoi4 notiee is eensider-ed to be less than 24
helms
i. The entranee to the pfopelty to deter-Faine ifeanditions fof a pai4ial or- total exemption have been smisfied will not be neeessafy if the etistemer- has pr-eper4y
installed,tested,and maintained an approved RP or air gap on every and all ser-viee oonneetions serving the eustomer!s
e. TheAdFnieistfative—At4hentyenay collect fees for the
administration of this program.
d. The Administrative tive Authority shall maintain records o
eantainment hazafd sufveys,and of the installation,testing,and repair of all baddlo",prevention assemblies installed
for-n fft t:.
a.
An RP., air gap is required for,...r.tainr en4 for every direct..
«dir-e i ser-viee eeti a.gloss sueh e eeti n!
Attachment B
z1 qualifies for.,total.. partial l exemption; ,.
z. sus a fire protection system.
h. A DC y be installed for containment in pace of an air
gap when a partial exemption is granted.
6. A pai4ial exemption shall be granted only if all of the followin
conditions precedent a „r
i The entire—€aeilities—are—within the seeteand
applieability of the plumbing
ons
oAmes, "w
All the �7
i. A — ater- uses are protected by the "isolation"
F Chapter 6 of the Uniform Plumbing Code.
3. There are no aii-x' eater sappiest
4. There are no solar heating system
5. There, o ne 0 ent swinnning pools.
6. There, o no eenimo ..l/:„,1 str:.,l fluid systems.
7 The entire facilities and all pertinent a mst.,„..o�
and conditions are fully accessible for inspection by representatives of the City's Water and PoRution Control
d. No baelcAewprevention as.enibly is required 4:6F eontainment
when a total exemption is granted.
e. A total exemption shall be granted when ., partial exemption
has been granted and all of the following eonditions precedent are met.
for Fro protection systems.
2. ,.The foe l;t ;s loss than foul stories above grade
€. Failure ef the AdministFativeAtketyte notify a eustenier
that they do flot Eltialify for ad that they shall install baeklqow prevention assemblies fef eafftainment
shall in no way felieve a eustofner-of the r-esponsibility to eomply with all r-e"iremeots ef these regulations.
9. The P:reete f of•the r:t„of Ames Water and U,.11„t:,.„ Control
(v) New Seizvieezenneetiens
a. Plans shall be submitted to the Administrative Authority F r
Attachment B
b. The Administrative Authority shall ie"ire the installation
the appropFiate baek-flow prevenfien assembly for con4ainment before the initiation of water service.
<<��ire Protection Systems
system shall meet the r-e"ir-emen4s of Faetor-5,Mutual Reseafeh Cor-por-atioa(FN4)and UodeFvffiter-s Labor-ator-y(UL)
and the requirements of the fire code and the building code of the City of Ames, in addition to the requiremen4s o
paragraph(ii)a.Assemblies sized smaller than 2 1/2 inehes which have not been tested by IFN4 and listed by UL may
be allowed:f approved by the City of Ames Fire Department Chief
b. An nn shall be installed on all new and existing fire protection
systems w-hieh the Administrative Auffiority determines to have any of the following:
3. inter-eenneetiens with aaxili rysupies such as
r� r rs ponds,wells,mills, or ,or
i. Use of antif:Feeze—er- etl3ef additives in the
preteetion system unless an PW is used to isola4e the loop or-bra-neh eon4aining an4ifiwze or-other-additives 'when-a
DC is installed M the " "
3. Any other fkility, Condition ,vhich may
cause contamination
6. n PC will be required for all other fire pr- teetio systems.The
DC shall be re"ir-ed on all new systems a4 the time of installation and on existing systems M the time that they are
modified.
(vii)t'ertable Tan�s. Poitabletuiks and essels shalllled thr-eegh a
(,viii) installation of'TZaelEflow Prevention Assemblies
1�
a.
All 1 ackflow prevention assemblies for oo stain en4 shall be
installed so that they are accessible for testing as stated in the UPC at Seetion 603.4.3 thereof The installation shaU
also provide the same elear-ances as called for the water meter in the City of Ames Municipal Code,Section 29.205.(5).
b. There"ired baekflow prevention assemblies for containment
shall be installed in herizontal plumbing immediately following the meter or as close to that location as deem
praetical by the Administfative Authority unless approved in writing by the Administrative Authority. in any ease,it
shall be loeated upstream of any braneh piping. installation at this poin4 does not eliminate the responsibility of
eustomer- to pr-oteet the water supply system ffem eontamiaa4ion of pollu4ioa between the baek-14ow pr-evention
assembly and the water main, and to pr-eteet the NN,a4eF supply system frem een4amination or pollu4ion witliia the
C. if hot water is used w4kin the water system,thermal expansion
shall be pr-ovided for-when installing a baddlo",provention assembly fer-eofftainfnent.
.l if interruption of ..,ter service duff g testing .,n.7 repairof
baekflow assemblies for eontainment is tmaeceptable to the oustomer, another backflow prevention assembly
eontainmefft, sized to handle the temper-at=y wa4er-flow needed Ekwing the time of test or-repair-, shall be installed in
r.,llel r
Attachment B
(ix) Removal of i ackfl ow Prevention Assemblies
a.
The use of an assembly may he disconfi,,,e.l and the., .ti.hl..
removed fro presen4ation of sufficient evidence that the eustomer"alifies for an exemption.
(xTesting of Baek4lor` Prevention Assemblies
a. When ,ester service has been terminated for rion compliance,
the baekf[ew preverition assembly for-eentaintrient shall be repaired or replaced and then tested prior to the resumption
fwater
L(xi) .,Rd low incidents
a. ' lie—eustomer shall immediately notify the Administfative
Authority when the customer becomes aware giat baekflow has oectirred in the building, property, or private wate
system Feeeiving water-sefviee.
b. The Administrative Authority may order that water serviee be
temporarily sh:ut off when baekflow oeeurs in a eustomer's building,property, or private water systern. Stich sh-ut
«,7 ex4erit of the e «tams« do o „llut;e*
(xii) Existing 1 aekflow]Prevention Assemblies For Containment
a.
All hackflow prevention assemblies for eo t.inrr.ent installed
assemblies for the purpose deseribed herein at the time of installation and that have been properly installed an
main4ained,shall,except for the testing,inspeetion,and mainterianee re"irements under Seetion(x)and Seetion(xi�,
be exeluded frorn the Fe"irements of these rules so long as the Administrative Authority is assured that they will
satisfaeterily proteet the PIAIS. Whenever-the existing assembly for eon4ainmerit is moved fforii the present prior- to November 1, 1996, that do not meet the requirements of these regulations but were approved testable
Autherity determines that the eustomef ne longef "alifies for a pai4ial exemption, the unit shall be replaeed by an
approved baek-flow prevention assembly far eontainfrief4 meeting the re"ifeffieffts of these replations.
(34N') tffiteiilef Noll eeiRp4afk6e
a. in ease of iien eemplianee with these regulations, the
Administfative AtAkofity shall notify the eustorrief to eomplyA4hirt ten working days.in the event of failure or upoff
FefRSal Of the 6tlStOfflef to eOff1ply as Ordered, the Administrative Au4hofity may, a4er- notiee a-ad reasonable
opportunity for hearing,termina4e water setwiee.Non eamplianee ineludes,W4 is not limited to,the fellowiag�
1 Refusal to allow the Administrative Authority access
to the property te deter-mine if the conditions for a partial or total exemption have been satisfied, except when an R-P
or air gap is properly installed for containment and properly maintained
z -preverition
3. Failure to install a baskflow prevention asses ' for
e„4.,inmen4 which has bee.,required by the Administrative A„thori
4. Failure to test m n4ain or properly repair.,baekfle...
Attachment B
5. Failure to comply with the requir-emen4s of these
regulations
6. Refusal to replace a f:...lty backflow preven n
assembly
7. Removal of a baekl4ow pr-evef4ien--asseffibly-4of
containment w-hieh has been reqttired by the Administfative Aethor-ity exeept for seasonal removal as in Section(vi4)
(t Failure to r-epoft.,b eLflow; ..:.lent
io. Direct confieetien between the P)AIS and e sewer-lane
1 1. A situation w-h el,presents.. immediatet,health.haz ra
n
to the PWS
b. For cenditiens 7, 8,�cn l�ln,the AdministrativeAuthe
.,ill take the following stem
z 1 Make a reasonable ef-ort to advise the o.stom of
.
intent to terminate water se.—Jee
i. Tefmiame water- sef-aiEe-and lock ser-viee valve.
water service will remain inactive unfil correction of the violation has been approved by the Administrative Authority.
(3w COMMITTEE OF ADjUSTMENT There is hefeby established the
Containment Committee of Adjustment.
Building Official of the City or that offieial's designee;the Dir-eetor-of Wa4er-and Pollu�ioo CootFol of the Pireetef's
designee; and a representatill,e of the Building Board of Appeals, seleeted from among the mewber-s ef thm Boai-7d by
•:r. ..re of the Re ray members.
1. The said Coffffn:ttee of Adjustment shall have the follo..,;n,.n
i. Te hear-and,leeide appeals tha4.,lle..e .,
decision or determination made in the administration and enforoome+4 of Seetion 5.208(g)(e) of the Munieipal code
of the City of Ames,lo...e
z. To authorize, in specific cases,such exemption fro-m-
the r-e"ir-emeats of Seetion 5.208(g)(e) of the Mtmieipal Code of the City of Ames, lowa, as will not be eoatfar-y
(3Fvi) Pxeoumptiave Exemptions The following Vate� tS25 shall generally be> bath tubs,
softeners,showers, water oiFfiga4ion systems, ,
Attachment B
diskwashers,pre rinse stations,gar-den hose connections,drinking fi)tmtains,winals,carbonators/bever-age ,
garbage disposals, ice makers, cleaning ehemieal dispensers,and private fire hydrants.However-,when warrante
(20) Seetion 603.0 Cross Connection Control is amended by deleting the text and inserting the
following in lieu thereof-. Seetion 603.0 Gross Gofmeetioa GopAr-el shall be in eoff1plianee NN4
Seetion 28.209B of the City of Ames Muaieipal Code,
(16) Seetion 603.5.8 Water Cooled Equipment is amended to read--.
Water cooled eempressers, degreasers, or any other water eeeled equipment shall be proteeted by an approved
(17) Seetie; 603.510 Steam OF Hot MlateF Boilers is amended to
radiant hea4,shall have a r-e"eed pr-essufe pr-ineiple baek-fqow prevention assembly.
) Section 604.'�T;be,and Fittings is amended by adding the following!
The follwAring type of pipe and fittings are allowed in the interionlexterior of a building or stmetwe:
nterio
Above eenerete floor(lowest level)
(a) soft capper(Type K,L,NI)
(b) rigid eepper(Type K,L,M)
(e) —brass
(d) er-oss linked polyethylene (PEX) (as approved by Chapter 17 of the Uniform 121tiffibing
(e)duetile iron(few(4 ineh of larger+.
7(f) cpyC
Below ee.,.erete floor(lowest level)
(a) softcopper(type K)(approved flared or compression fittings only)
(b) PEX(as approved byChapterl 4 of Uniform Plumbing Code)
(e) Polyethy ene roc Inn SLDR 7 PE3409
(d) ductile iron(four(4)inch or larger-)with flanged me,.han e.,1 joints.
(e) G nnn Dx7G DR 14 (fire line1
r �T
(a) PEX(as appr-oved by Chapter-14 17 of the Uniform Plumbing Code),and which meets
mai+tifaettwer-'sspeeifieatiens�
(b) Soft copper(Type K)(approved flared or compression fittings only)
(0) Brass
(d) Ductile iron(mechanic-al joint)(bolts-shall be teflon coated)
(e) 1PVC meetingAWW n C nnn ran 1 n for fire lines,,n Dr for.,o fire lines.
r�-r-c-�-v�Standx'�rd9,�rcxTzvrzrrc irico-cs c iricr.
if) n l„ethy ene roc 200 p.s.i. cr ran 7,PE3408
Note; Polyethylene,PRX and PVC C 900 shall be installed with a 14 gauge selid eapper-tfaeer-wir-e in a blue j acket
affixed to the pipe a4 appropr-ime intervals.T-lie traeer-wir-e will sta44 with a 5 feet eleetfieal ground stake a4 the water
main, eentialde to the water meter, a-ad be tefmiaa4ed a4 a wea4herpreaf junetion box a4 an approved leemien en th
building ex4er-ier, An appropriate spliee may be used at the water meter, The junetion box shall be weessible and
labeled to identify it as a tracer, e
(21) Section 604.6 Cast-Iron Fittings is deleted.
Attachment B
(22) Section 604.7 Malleable Iron Fittings is deleted.
(23) Section 604.10.1 Tracer Wire.Delete Section 604.10.1 and insert the following in lieu thereof.
Plastic materials for building supply outside underground shall be installed with a 14-gauge solid
copper tracer wire in a blue jacket affixed to the pipe at appropriate intervals. The tracer wire will
start with a 5 foot electrical ground stake at the water main and be terminated at a weatherproof
junction box at an approved location on the building exterior. An appropriate splice may be used at
the water meter. The junction box shall be accessible and be labeled to identify it as a tracer wire
termination.
(23) Seetion 605.0 joints and Conneetions is amended by adding new subseetions 605.0.1 through
605 n 1 3 as follows:
See. 605.0.3. All threaded taps on the main shall be at least 24 inehes apart and shall be at least See.605.0.1. Curb Stops shall be of the quai4er-tum ball valve t�Te with the grip joint ends.
size. if more than one tap is made for a service line, the taps will be staggered on the pipe. No more than
thfee(3)thfeaded taps shall be made for a serviee eenneeted to a 4 ineh or larger-main. Maximum thfe
tap size for a 4 ineh main is 314'
neh.All taps will be made in the top half of the water main,but not more than-
above the horizontal plane. All serviees having two (2)taps or-more shall be eembined thfough a brass
The-
following table lists appropriate n . ber-of taps for different ser-viee sizes.
Taps-
1 neh—two 344 ineh or-one 1zneh
n4 ifieh—two nneh
1',� ineh—two Tmc-
See. 605.0.4. Service saddles allowed on fotff(4) ineh or larger-water mains when water service is 3 n n
1 � 1
,�" shall be a Smith Blair-,er-equivalent,#317,#357,#372,#3 93 or#397.The saddles shall have
a stainless steel strap with two belts wide mininwm. The belts or nuts shall be either stainless steel or blue
coated. When tapping a four (4) inch or larger main for water services for a vw (2) inch or larger-wate
setwiee>the Smith er ivalent stainless steel full > o
be used.The belts and auts shall be either stainless steel or-bitte eeated.Any wa4er-ser-viee thm is larger Oia
a twe(2)ineh shall r-e"ir-e a tapping valve and sleeve a4 th . . te main. The Post ladieatar-V
(PIV) for-fire line shall not sen,e as the wa4er- ser-viee valve after the main. All tapping valve sleeves s
meet the Urban St.,nda f,1 Qpeei fie tiers as f 11.ws.
(2)S
(a)TiT:,,.:,v.,,,v. 14 gauge
(b)Stainless stool ASTIR A240 Type 304
(e)W rv;ng pressufe 200 p
(d)Must fully s «.7 pipee
(e)Approved sleeves
(i)!''.,s.ade\II a4er-Ale fks Ti1anu f etufifi.Company, St..lo COST R
(4)Power-Sea!Pipeline Pr-e"ets 0
Model 3490,
(iv)Appr-eved equal
!Z £et.L
(a)To completely y surround pipe
(e)Material:nit.-ile r„bber.
Attachment B
(4)n„41et Flange:
(a) Stainless steel nSTM n240 Type inn
(5)Belts: Stainlesssteel,ST�24-0,Type 304
,
sleeve shall be p laee,l afound the,. «to allow for expansien and,. .-.4raetie.,.
See.605.0.6. in a new s4division the water ser-viee line shall be installed a4 the center of the proper-ty wiless
ether-wise.. .e.l by the n.lm iais4r..4:..e n..4hor:4..
property line or as close as possible therete and in alleys v�4thin ene foot of the alley line,except two(2)i
and lafger-,w-hieh shall ha-ve a stfeet valve box over-the valve at the wMer main.The eufb eaek te be use
See. 605.0.7. There shall be a"rb cook in ewe-x sev,.ee connection to the main. it shall be lecated on
Fer-d Ball Valve 3A4th 0
eufb eaek and shall be the same diameter as the pipe serwed. The eur-b eeek shall be kept in an oper-a4ive
«.1:4:..« ..4..11 times
> ,
extending to the curb gFade. in eases where the suffaee of the gr-ound is hig-her-than the etwb gr-ade to the
extent thM the eufb box will not extend suffieiently to be in plain view,then the eufb box shall be ex4ended
to the ground surface. Whenever a water se i i d the curb bex shall be br-eugh4 to the eurb grade
or present natural greund level and moved te the preperty line.in placing the curb ceek in position,care must
be exercised to previde against settlement of the curb box,by providing a base ef brick, stene er cenerete
bleck set en solid earth for support.A suppert shall be placed across the diteh and wired te the curb bex ne
the top to keep it in a vei4ical position while filling the ditch,
See. 605.0.9. A corporation ceek of either a Mueller or Ford make, or its equivalent, shall be inserte
every tap one and one half inch or less in diameter made in the water main.The connection to the main shall
be made by a regulation corporation cook and copper service with a compression joint if the pipe is plastie
SIPR 7 200 P 3 4 09.All eenneetions to the wa4er-main shall be adequately looped to prevent br-ea-kage
d.4eh se441eme«4
See. 605.0.10. A service valve shall be installed inunediately following a two (2) ineh or larger tap on
take offs from the water main or .ate vv.
reason,the service line shall be at least one inch in diametef. Where an existing structure is to be conve
See. 605.0.11. Where a single water service line provides seiwice to a new duplex or is split for any ot
equivalent service may be provided by a separate tap.The new serviee lines shall be divided
installed,ser-viees may be split inside the building so long as sh-ut of& afe
and separme 3
fun 4e the individual a,stonier units
Attachment B
the City for inspection pteposes.No charge will be fnade for water used for fire puToses through a sprinkle
system. The fire line shall be a mininium four(4) inch diameter v�4th a shut off valve installed after the-tap
into the main.When required,the PIV shall be a minimum of forty(4 0)feet from the building or at a lee
determined by the fire: eeto f
Exception t The fire line may be smaller than 4"in size if hydraulic caleulations by the fire spr-ifik4er-comp
slow that a 4"would not be required.
See. 605.0.13. Where required, a post indicator valve (IPIV) m-ust be set at 36" above final grade. The
termination flange, inside the building, shall not be more than twelve (12) inches above finished floor level
and be set at a true vertical position.When en4er-ing thfough a wall,the termination flange shall not be more
than twelve (12) inches from the wall and set in a true horizontal position. The fire line shall have a
hundred (200)petmd pr-essufe test done for-a fninimufn of two (2) houfs without losing any pfessufe.
f4r-e line shall be tested ffofn the tap at the main to the teffnination flange with the-PIN'epen a-ad the eufb box
elesed.Ne f4r-e line statie pr-essufe test shall be stafted after- 1�30 .,
herizon4al position tfaveling thfough an exterior wall or shall have no smaller than 3
,
in the treneh - lug t�xpe supports,however-, a eonerete thrust block shall be in front of fire line
traveling from horizontal to vertical prior to the termination flange.Only PVC C 900 DR i 4 and ductile i
shall be used for the fire line service. The fittings shall be mechanical joint type. The tapping valve,or equivalent all thread rod used between said flanges to keep fire line termination stable.The fire line loca
and all other-fittings and pipe shall be ffhw4ed te withstand 200 p.s.i.Befe Bae T test,the
line shall be Aushed thoroughly by the plumbing eooti-7aeter.The een4raetof shall request,from the laspeetie
Division will eolleet the sample fer-testing. if the fife line passes Bae T test, the laspeetion Division will
eontaet the plumbing eontraeter,The termination flange shall have a twe(2)inek ball vaive to preperly
the fire line
off so that the deffiestie ser-viee will ha-ve a eur-b stop and stop box at the pr-opet4y line. if a PIV is(a)if the fife line a-ad water-sef-.,iee are on one lifie,the demestie water seizviee shall have the tak-e
the domestic service will braneh off prior-to the PIV and have a curb stop and stop box adjaeen4 to the PIV.
The take off for the water service shall be either brass,duetile ir-on,C 900 PVC DR!4,or copper to the ourb
(b) The ourb stop and stop box may be installed at another location with prior approval of thee
inspections Division and the Water and Pollution Control Dep rtmen4
(22) Seetion 608.5 Drains is amended by deleting and replacing uthe outside of the building" cc
properly drained surface".
(23)Section 609.1 installation is amended by deleting the last two sentences in the section and inserting4he
following in liett thereof-.
All water serviee lines shall be installed at least five feet below finish grade. if the water serviee eannot b
btwied below frost depth at any poin4, the trench shall be lined with 1 1 » Board"
insulation oF
equivalent as approved by the Administrative Authority.Sand baekfill material shall then be placed to a depth
of one foot above the top of pipe, then 1 1 n "BlueBoard"
or equivalent will be installed so that the e
treneh width and length in the area needing protection against freezing is insulated and then backfilled
insulation..hall be.,t least five(5)feet in,le..&
Attachment B
(24) Section 609.1 Installation.Delete Section 609.1 and insert the following in lieu thereof:
Section 609.1 Installation.Water piping shall be adequately supported in accordance with Table
313.3.Burred ends shall be reamed to the full bore of the pipe or tube.Changes in direction shall be
made by the appropriate use of fittings,except that changes in direction in copper or copper alloy
tubing shall be permitted to be made with bends,provided that such bends are made with bending
equipment that does not deform or create a loss in the cross-sectional area of the tubing Changes in
direction are allowed with flexible pipe and tubing without fittings in accordance with the
manufacturer's instructions. Provisions shall be made for expansion in hot-water piping.Piping,
equipment,appurtenances,and devices shall be installed in a workmanlike manner in accordance
with the provisions and intent of the code.Building supply yard piping shall be not less than 60
inches below earth cover.
(25) Section 609.1 Installation.is amended by adding the following new sections 609.1.1 through
609.1.9
Section 609.1.1 New Service Location.In a new subdivision the water service line shall be installed
at the center of the property unless otherwise approved by the Administrative Authority.
Section 609.1.2 Threaded Taps on Water Mains. All threaded taps on the main shall be at least
24 inches apart and shall be at least 3/4 inch in size.If more than one tap is made for a service line,
the taps will be staggered on the pipe. No more than three (3) threaded taps shall be made for a
service connected to a 4-inch or larger main. Maximum threaded tap size for a 4-inch main is 3/4
inch. All taps will be made in the top half of the water main, but not more than 45" above the
horizontal plane. All services having two(2)taps or more shall be combined through a brass wye
pipe connection. The maximum length of service from the main to the wye shall be four(4) feet.
The following table lists appropriate number of taps for different service sizes.
Service Size Taps
1 inch=two 3/4 inch or one 1 inch
1'/4 inch=two 1 inch
1'/z inch=two 1 inch
Section 609.1.3 Corporation Cock Required. A corporation cock of either a Mueller or Ford
make,or its equivalent,shall be inserted in every tap one-and one-half inch or less in diameter made
in the water main. The connection to the main shall be made by a regulation corporation cock and
copper service with a compression joint if the pipe is plastic SIDR-7 200 P 3408. All connections
to the water main shall be adequately looped to prevent breakage from ditch settlement.
Section 609.1.4 Service Valve Required.A service valve shall be installed immediately following
a two(2)inch or larger tap on all take offs from the water main or private main.
Section 609.1.5 Service Saddles. Service saddles allowed on four(4)inch or larger water mains
when water service is 3/4", 1", 1'/4", and 1'/2" shall have a stainless-steel strap with two bolts wide
minimum. The bolts or nuts shall be either stainless steel or blue coated. When tapping a four(4)
inch or larger main for water services for a two(2)inch or larger water service,the service saddle
shall be a stainless-steel full wrap around saddle.The bolts and nuts shall be either stainless steel or
blue coated. Any water service that is larger than a two (2) inch shall require a tapping valve and
sleeve at the main or private main. The Post Indicator Valve (PIV) for fire line shall not serve as
the water service valve after the main. All tapping valve sleeves shall meet the Urban Standard
Specifications as follows:
(1)Valve: Tapping valve conforming to ANSI/AWWA C509.
(2)Sleeve:
(a)Minimum 14 gauge
(b)Stainless steel,ASTM A240,Type 304
(c)Working pressure 200 psi.
Attachment B
(d)Must fully surround pipe
(3)Gasket:
(a)To completely surround pipe
(b)Minimum thickness 0.125 inch
(c)Material:nitrile rubber.
(4)Outlet Flange:
(a)Stainless steel,ASTM A240,Type 304
(b)ANSI B 16.1, 125 pound pattern
(5)Bolts: Stainless steel,ASTM A240,Type 304
Section 609.1.6 Curb Stop required.There shall be a curb stop in every service connection to the
main.It shall be located on the property line or as close as possible thereto and in alleys within one
foot of the alley line, except two (2)inch and larger,which shall have a street valve box over the
valve at the water main. Curb Stops shall be of the quarter turn ball valve type with the grip joint
ends. The curb stop to be used for services from three-fourths(3/4) inch to two (2) inches shall be
the style known as Mueller Mark II Oriseal or Ford Ball Valve with 90' curb stop, or equal,
provided with T handle and extension rod keyed and locked to curb stop and shall be the same
diameter as the pipe served. The curb stop shall be kept in an operative condition at all times.
Section 609.1.7 Curb Box required. The curb stop shall be covered by a curb box of the Western
pattern No. 100,or equal,extending to the curb grade. In cases where the surface of the ground is
higher than the curb grade to the extent that the curb box will not extend sufficiently to be in plain
view, then the curb box shall be extended to the ground surface. Whenever a water service is
renewed the curb box shall be brought to the curb grade or present natural ground level and moved
to the property line.In placing the curb stop in position,care must be exercised to provide against
settlement of the curb box,by providing a base of brick, stone or concrete block set on solid earth
for support. A support shall be placed across the ditch and wired to the curb box near the top to
keep it in a vertical position while filling the ditch. In the event a curb box is set in any location
where a concrete or asphalt surface is to be placed,a sleeve shall be placed around the cap to allow
for expansion and contraction.
Section 609.1.8 Water Services Serving Fire Sprinkler Systems. Sprinkler systems used for fire
protection may be permitted to be attached to the water mains by a licensed Plumbing Contractor.
No open connection can be incorporated in the system, and there shall be no valves except the
service valve at the main unless a post indicator valve (PIV) is required. One- and two-family
residential sprinkler lines shall be metered through the single meter. The property owner or tenant
shall promptly report to the City any seal which has been broken for the closing of the system. A
detailed drawing of the sprinkler system shall be filed with the City and free access to the building
shall be granted the City for inspection purposes.Water services shall be sized to accommodate the
requirements of the fire sprinkler system.
accommodate the requirements of the fire sprinkler system.
Section 609.1.9. Where required,a post indicator valve(PIV)must beset at 36"above final grade.
The termination flange,inside the building,shall not be more than twelve(12)inches above finished
floor level and be set at a true vertical position.When entering through a wall,the termination flange
shall not be more than twelve (12) inches from the wall and set in a true horizontal position. The
fire line shall have a two hundred(200)pound pressure test done for a minimum of two (2)hours
without losing any pressure. The fire line shall be tested from the tap at the main to the termination
flange with the PIV open and the curb box closed. No fire line static pressure test shall be started
after 1:30 p.m.,Monday through Friday.
A certified fire sprinkler installer may install the backflow device to the sprinkler system for
containment.The termination flange,inside the building,from horizontal to the vertical position or
from horizontal to the horizontal position traveling through an exterior wall or floor, shall have no
Attachment B
smaller than 3/a inch galvanized or equivalent all-thread rod used between said flanges to keep fire
line termination stable.The fire line located in the trench may use mega-lug type supports,however,
a concrete thrust block shall be in front of fire line traveling from horizontal to vertical prior to the
termination flange. Only PVC C-900 DR 14 and ductile iron shall be used for the fire line service.
The fittings shall be mechanical joint type. The tapping valve,PIV, and all other fittings and pipe
shall be marked to withstand 200 p.s.i.
(a)If the fire line and water service are on one line,the domestic water service shall have
the take off so that the domestic service will have a curb stop and stop box at the property
line. If a PIV is required,the domestic service will branch off prior to the PIV and have a
curb stop and stop box adjacent to the PIV.The take off for the water service shall be either
brass,ductile iron,C-900 PVC DR14,or copper to the curb box.
(b) The curb stop and stop box may be installed at another location with prior approval
from the Authority Having Jurisdiction.
(24) Seetion 609.5 Unions is amended by adding the following to the end of the seetion:
Exceptione water heaters and boilers.
(2 609 ,I0 cap.. u
� �eFti9a-v�riv--�-Rte�'�i�irMC'rzS-3rii i-n-g:
Exeeptiom Single family dwelling tmits.
(26) Seetion 609.12 Pipe insulation.Delete Seetions 609.11 thfough 609.11.2 and inse]4 the fell
in lieu thereoP Seetion 609.12 Pipe lastda4ioa. lastda4ion of domestie hot wmer-piping shall be in
aeeordanee with the applieable energy eonservation code-.
(27) Section 610.1 Size,Size of Potable Water Piping,is amended by deleting the words"each water
meter and"from the first sentence and adding"Water meter sizing shall be determined by the Water
Meter Division"to the end of the section.
(28) Table 610.4 Fixture Unit Table for Determining Water Pipe and Meter Sizes is amended by
deleting the language in footnote 2 and inserting the following in lieu thereof: Replace"Building
supply,three-quarter(3/4)inch nominal size minimum."With"Building supply,one(1)inch
nominal size minimum.
(29) Section 610.8 Size of Meter and Building Supply Pipe Using Table 610.4 is amended by adding
the following exception.
Exception: Where a single water service line provides service to a new duplex or is split for any
other reason,the service line shall be at least one inch in diameter.Where an existing structure is to
be converted to a duplex a 1"equivalent service may be provided by a separate tap.The new service
lines shall be divided by a wye at the property line. Existing V services may be split inside the
building so long as shut-offs are available in a common area. Separate curb boxes shall be installed,
and separate 3/a inch service lines shall be run to the individual customer units.
(30) Section 610.8(6)Size of Meter and Building Supply Pipe Using Table 610.4 is amended by
deleting the last sentence and inserting the following in lieu thereof:No building water service line
shall be less than one(1)inch diameter.
(31) Section 611.4 Sizing of Residential Softeners.Modify the section by adding the following to the
end of the last sentence in the section: "or as specified in the manufacturer's installation
instructions."
Attachment B
(32) Section 612 Residential Fire Sprinkler Systems.Delete sections 612.0 through 612.7.2.
Drainage pipe and f4tings used inside a new building of an existing building fef undergFou-nd sliall
be, o brass,r(t.Te r ABS (sehe le nmv nC(sehe „lo 40 , east;Rxeeptiew Galvanized may be used e4j ter-system when the disehafge line is thfee(3)
«,.h of 1.,.ger- The ....lya- ize shall only be piped n mefe than f of(4)feet eu, ef pit
Above ground piping shall be the same as tindergrotmd except that ABS and IPNIC pipe may
eeex4mded and copper tube and fittings may be type N!for eoFmnereial and stmetures that are more
than a one and two family dwelling. A one and twe family dwelling may use type DWV copper
tubes
(30) Table 702.1 Drainage FixtuFes Unit Values(DFU)is amended by adding the following to footnote
Publie use shall be any building E)r-stfuetufe thm is fiet a dwelling unit. Fratemities and sar-ar-iti
afe not elassified by this seetien as a dwelling unit.
• Minimum Size,Size Of DFOiHage Piping,
is affiended by adding the following at the
end of the seetiew
No underground drainag t shall be less than two(2)inehes inside diameter.
(33) Table 702.1 Notes.Note#8.Modify this note by adding the following at the end of the footnote:
"Public use shall be any building or structure that is not a dwelling unit.Fraternities and sororities
are not classified by this section as a dwelling unit."
(34) Table 702.1 Notes. Note#9.Modify this note by deleting"a maximum shower size of 36 inches
(914 mm)in width and 60 inches(1524 mm,)in length"and inserting the followingin n lieu
thereof: "showers having only one shower head rated at a maximum of 2.5 gpm."
(35) Section 703.1 Minimum Size,Size of Drainage Piping,is amended by adding the following at
the end of the section: No underground drainage piping or vent shall be less than two(2)inches
inside diameter.
(36) Section 704.3 Commercial Sinks is amended to read"pot sinks,scullery sinks,dishwashing
sinks,silverware sinks,and other similar fixtures shall have an airgap indirect waste connection
to a properly trapped and vented floor sink. Commercial kitchens must have at least one floor
sink with a three-inch waste line serving the main scullery sink."
sewer.(33) Seetion 705.0.1 is added:No molded rubber coupling(Fernee Coupling or equivalent)shall be use A
on any sanitary sewer or storm sewer.Appropriate stainless steel shielded molded rubber couplings
may be used as conneetions when eonnecting sanitary or storm sewers. Single band shielde A
couplings(no h4 elamps)are not allowed on any ex4erier building sanitary sewer-,or storm
(37) Section 710.1 Backflow Protection.Modify the section by adding the following sentences to the
end of the section: "The requirement for the installation of a backwater valve shall apply only
when determined necessary by the Authority Having Jurisdiction based on local conditions.When
Attachment B
a valve is required by the Authority Having Jurisdiction,it shall be a manually perated gate valve
or fullway ball valve.An automatic backwater valve may also be installed but is not required."
(38) Section 715.2 Joining Methods and Materials is amended by adding the following exception:
No molded rubber coupling shall be used on any sanitary sewer or storm sewer.Appropriate
stainless steel shielded molded rubber couplings may be used as connections when connecting
sanitary or storm sewers. Single band shielded couplings(no hub clamps)are not allowed on any
exterior building sanitary sewer,or storm sewer.
(39) Section 717.1 General,Size of Building Sewers.Delete the first paragraph and insert the following
in lieu thereof: "The minimum size of any building sewer shall be determined on the basis of the
total number of fixture units drained by such sewer, in accordance with Table 717.1
Maximum/Minimum Fixture Unit Loading on Building Sewer Piping.No building sewer shall be
smaller than four(4)inches.The building sewer shall not be smaller than the building drain.
With prior approval from the Building Official,a sewage ejector may discharge the building sewer
to the public sewer manhole when the public main is too shallow to allow the building sewer
discharge to flow by gravity.The pipe material to be used shall be Polyethylene(P.E.)Two(2)inch
SDR 7, 3408.The 2" line shall at all times be a minimum of five(5) feet deep or freeze protection
is required. The sewage ejector shall be vented with a minimum two(2)inch pipe.
(40) Section 718.2 Support.Delete this section in its entirety and replace by inserting the following in
lieu thereof. Building sewer pipe made of cast iron,copper,or extra strength vitrified clay shall be
laid on a firm bed.Pipe consisting of Schedule 40 PVC/ABS,PVC SDR 23.5/35 and PVC truss pipe
shall be enveloped on bottom,sides and top with a minimum of four(4)inches of either one(1)inch
clean or 3/8"minus crushed rock,3/8"washed chip or"pea gravel". After enveloping the pipe,the
remainder of the ditch may be filled once the inspection is complete.
depth,(36) Seetion 718.3 Protection from Damage is amended to read as follows:
No building drain or sewer shall be closer than two (2) feet from the building stractufe or footing
that is not made out of cast iron, Schedule 40 PVC, or Type "L" copper. At no poin4 shall the
building sewer be less than five (5) feet in depth on new eenstruction or when replacing existing
sewers. if less than five (5) feet in
the trench shall be lined with 1 1 »
insula4en. The instila4ion of the sides shall be at least five(5)feet below finished gr-ade with a ea-p
ever the two sides.
n n
sides a-ad top of pipe Abefiever-any type of PVC is used.Whenever-east iron is used sand may take
the plaee of the one(1)ineh r-oek.Whenever-pessible,the building sewer-shall be a4 a depth of nine
(9) feet below street grade from the main to the property line on new constmetion. Whenever
possible on a duplex or single family dwelling, the building sewer shall not be located tmder- a
driveway.
(41) Section 719.6 Manholes is amended by deleting the second paragraph.
(39) Section 804.4 Bar-and Fountain Sys is amended to read s f 1�Ps:
Sip4s(exeept hand sinks)in a baf,aigh4e!4,tavem,er-soda feupAaia shall drain te an approved a-ad—
pr-eper-ly tfapped and vented floor-sink thfough an approved airgap or-airbreak.The lqoor-siFAE,drain
line,trap,and strainer inlet shall be at least three(3)inch pipe size.The developed length from the
fixt„ro outlet to the floor sink shall not exceed five(5)Cot
Attachment B
(42) Section 807.3 Domestic Dishwashing Machine. Modify the section by deleting the section and
inserting the following language in lieu thereof."No domestic dishwashing machine shall be directly
connected to a drainage system or food waste disposer without the use of an approved dishwasher
air gap fitting on the discharge side of the dishwashing machine, or without looping the discharge
line of the dishwasher as high as possible near the flood level of the kitchen sink where the waste
disposer is connected. Listed air gap fittings shall be installed with the flood level(FL)marking at
or above the flood level of the sink or drainboard,whichever is higher.
(43) Section 814.5 Point of Discharge.Delete Section 814.5 and insert the following in lieu thereof:
Section 814.5 Point of Discharge.Air-conditioning condensate waste pipes shall connect
indirectly to a properly trapped fixture,floor drain,or open sight drain,or where permitted in
Section 814.6,to the drainage system through an air gap or air break to trapped and vented
receptors,dry wells,leach pits, sump pump,the tailpiece of plumbing fixtures or indirectly to o the
building storm sewer through a roof drain.A condensate drain shall be trapped in accordance with
appliance manufacturer's instructions or as approved.
(44) Section 901.1 Applicability.Modify the section by adding the following sentence to the end of
the section: "No engineered single-stack drainage systems shall be installed."
(45) Section 901.2 Vents Required,is amended by adding the following at the end of the section:
"All single-family or two-family dwelling units with a basement shall be provided with a two (2)
inch future vent. The future vent shall be combined with other vents or terminate through the roof.
Such vent shall be capped in the floor joist area of the basement for future use. The two (2) inch
vent is for a future basement bathroom or other approved fixtures.
(41) Section 902.2 Bars, Soda Fountains, and Counter,Vents Not Required, is amended to rea
fellows:
Sif&(exeept hand sinks)in a baf,aigh4elub,tm,em,or-soda feapAain shall dr-ain te an approved and-
pr-epefly tfapped and vented floor sink through an approved aifgap or aifbfeak. The 1400r-sink, its
drain line,tfap,and stfainer-inlet shall be at least three(3)inek pipe size.The developed length ffem
(42) Seetion 903.1 Applieable Standards,Materials,is amended to read as follows-
iron.Drainage and vent pipe and fitting used inside a new building building for
underground shall be copper(Type L),brass,ABS (Sehedule 40),PVC(Schedule 40)or cast
Above groiind piping shall be the same as underground except that eoextruded PVC and ABS nay
be used, and copper tube and fittings may be Type N!for commercial and struetwes that are other
than a one and two family dwelling.One and two family dwellings may use Pfpe DWV copper tube,
ieploee it1v:+'�Pe
Attachment B
follows:(46) Seetion 906.7 Frost or Snow Closure,Alent Termination,is amended to read as
Change two (2) inehes to thfee (3) inches and ten (10) inehes to twelve (12) inches and remove
of r e.
(46) Section 906.1 Roof Termination.Modify the section by deleting the last sentence.
(47) Section 906.7 Frost or Snow Closure.Modify the section by deleting two(2)inches(50.8mm)"
in the first sentence and inserting"three(3)inches(76.2 mm)"in lieu thereof.
(47) Seetion 908.2 Horizontal Wet Venting for a Bathroom GFoup. is amended to Water ,
bathtubs, showers and floor drains within one bathfoom group located on the same floor level and
for private use shall be permitted to be vented by a herizen4a!wet vent where all of the conditions
f Section ono 2 i through Section 908 2 5 are met
(48) Section 908.2.2 Size.Delete the second sentence in this section and insert the following new
sentence in lieu thereof. "The wet vent shall be not less than 2 inches(50 mm)in diameter for 6
drainage fixture units(dfu)or less,and not less than 3 inches(80 mm)in diameter for 7 dfu or
more."
(49) Table 1002.2 Horizontal Lengths of Trap Arms is amended to read as follows:
Table 1002.2
Horizontal Lengths of Trap Arms
(Except for Water Closets and Similar features)-"
Trap Arm Diameter Distance trap to vent Length Maximum
(inches) Minimum(inches) (feet)
1-1/4 2-1/2 5
1-1/2 3 6
2 4 8
3 6 12
4 8 12
Exceeding 4 2 x Diameter 12
For SI units: 1 inch=25.4 mm
Notes:
1 Maintain'/4 inch per foot slope(20.8 mm/m).
2 The developed length between the trap of a water closet or similar fixture
(measured from the top of the closet flange to the inner edge of the vent)and its
vent shall not exceed 6 feet(1829 mm).
(50) Section 1007.1 Trap Seal Protection.General.Modify this section by deleting"not deemed
necessary for safety or sanitation by the Authority Having Jurisdiction"and inserting the
following in lieu thereof. "floor drains or similar traps that receive a liquid discharge year round."
(51) Section 1014.1.3 Food Waste Disposers and Dishwashers.Modify the section by deleting the
second sentence and inserting the following in lieu thereof. "Commercial food waste disposers
shall discharge into the building's drainage system in accordance with the requirements of the
Authority Having Jurisdiction.
Attachment B
(49) Seetion 1101.3 Storm Water Drainage to Sanitary Sewer-Prohibited is amended by adding-the
following:
Whenever such connect' Ftent is f6tind to exist in violation of the or-dinanees of this
eity a-ad Chaptef 5, whereby surfaee wa4er- funoff-, subsoil of footing drainage is disehafged of
divefted inte the sanitary sewer- system, the inspeeter shall issue a Nwitten fietiee to the oNN%ef
l 1 1101.4 Ma 1 7T 11.....
�SS�Seetien- .�te�i�ses�s-ate to e�-oPs:
Rainwmer-piping plaeed within the intefier of a building to two (2)feet eut of building or footings
shall be east ir-on,brass, eepper(Type M), Sehe"Ie 40 PNIG or-Sehedule 40 ABS DWV. Sehedule
4 0 PNIG and ABS pipe installed within a duet or plenums shall be insula4ed with an insula4ion having
a flame spFead index of not more than 25 and a smoke index of not mofe than 50. Co&EtMded P3,LC,
&ABS pipe not allowed below grade.
Rainwater piping placed outside a building shall be east iron,brass, copper(Type M), Schedule 40
PVC or Schedule 40 ABS DVX,reinforced conerete pipe (RCP), vitrified elay pipe (VCP), SD
23.5�Dvr, SD35 PVC� gV�r truss pipe, A2000 pipe, and eorFugated high a n3i.c.�,
polyethylene(D F)
SPR 23.5-PVC,SP 35 PVC schedule 40 Dvr or-Sehed le nn ABS,Dvr truss, Dvr A2000,aneonneeted to the City stofm main M intakes, manheles, of eenneeted difeetly into the stofm 1
main.eofmga4ed polyethylene pipe ou4side a building shall be ewveloped with fouf(4)inehes of efushed
and sides. Coe*tmded PNIC&ABS pipe not allowed below gFade. The stofm NNetef seweF fflay b-e
Whenever a direet connection is made to the storm main,the connection shall be made by a clamping
saddle.. ., Dtti..g with a sealant that.v.al ater and root pr.,.,F
(',�)or more of the size of the storm a manhole shall be re"ired
main,
Standards(SUDAS).
All dir-eet taps into the storm main shall be installed on the top one half at the point of eonnection to the storm main. All manholes shall meet the lowa Statewide Urban
The stot:Fa sewer-shall have a eleanou4 installed evefy one hundiFed(100) feet and eVery ehaRge Of
. in plaee of a eleanout every one I+Hndr-ed(100) feet, a manhole shall be
plaeed every &ee hundr-ed (300) feet (manhole shall meet loAe Sta4ewide Ufban Standar-
(S 1
No Ferneo eoupling or no hub elamp shall be used on the storm sewe
Exception: When converting to PVC truss pipe or clay pipe, a Ferneo stainless steel shielde A
coupling shall be used on storm sewer.
(54) Section 1101.6.1 Dis..l....ge,Subsoil ilF ins is amended to read as follows:
The subsoil drains may be allowed to discharge to a pond,or water-way if approved by the Biiilding
Offieial. if not allowed by the Building Offieial, the subsoil drain shall be diseharged to a stE)Fm
main.
Regardless,the gr .ity line shall hav a 1...,.e L..a4er-valve-.
in existing buildings,if granted pet:Faissian by the plumbing iaspe6tff-,the pefiffietef-tile May 14ew
by gr-a-vity to a stefm main, intake, or manhole if there is a4 least ten (10) feet Nzel4ieal height
difference ronce between the perimeter file.,,...1 the stor.v.main,intake,or manhole.
(52) Section 1101.6.2 Sump,is amended by replacing"fifteen(15)gpm"with"17 gpm with a
seventeen(17)foot head"and adding the following to the end of the section: The sump pump line
may be either Schedule 40 PVC or Schedule 80 PVC pipe. The fittings shall be either schedule 80
PVC deep socket or schedule 40 deep socket pressure fittings.The sump pump line may also be 1
Attachment B
'/z"polyethylene(PE) SDR 9,3408.The PE joints shall be made with ribbed insert fittings secured
by stainless steel clamps. The sump line shall be buried no less than five(5)feet in depth from
finished grade.If this depth cannot be maintained,freeze protection shall be provided.When the
sump line is discharged into a storm manhole,intake,or storm main that is not five(5)feet below
final surface grade,a quarter('/4)of an inch hole shall be drilled into the bottom portion of the
horizontal 90°elbow before pipe is placed in the vertical position.
If two sump lines are combined together,the sump line shall be a two(2)inch line to the storm
main,intake,or manhole. The sump pump shall have an electrical outlet within reach of the
manufacturer's cord.
No foundation drain service line shall be discharged onto property,someone else's property,or
into the building drain or building sewer.No floor drain,clothes washer,or any other plumbing
fixture shall be discharged into the foundation sump pit.
Every sump pit in an elevator shaft shall meet the rules and regulations as required by the State of
Iowa for elevators.No hydraulic elevator sump shall be discharged into a storm or sanitary sewer.
(53) Section 1101.6.3 Splash Blocks is deleted.
(54) Section 1101.6.5 Open Area is deleted.
,
and VeFtieal RaiRWRteF PiPiRg,and 4403.3 Size Of GUtteFS afe amended by adding the following
note to the end of each taW-
Rainfall r-a4es for-the City of Ames shall be based at thfee and one half(3 1,�)ifiehes of r-ain per-he,
(55) Sections 1205.0 through 1205.2 Authority to Render Gas Service.Delete the sections
(56) Sections 1207.0 and 1207.1 Temporary Use of Gas.Delete the sections.
(57) Section 1208.6.4.5 Corrugated Stainless Steel Tubing.Delete section 1208.6.4.5 and insert the
following in lieu thereof. Corrugated Stainless Steel Tubing. Only CSST with an arc-resistant
jacket or covering system listed in accordance with ANSI LC-1 (Optional Section 5.16./) CSA
6.26-2016 shall be installed,in accordance with the terms of its approval,the conditions of listing,
the manufacturer's instructions and this code,including electrical bonding requirements in Section
1211.2. CSST shall not be used for through-wall penetrations from the point of delivery of the gas
supply to the inside of the structure.CSST shall not be installed in locations where subject to
physical damage unless protected in an approved manner.
(58) Section 1211.3 Arc-Resistant Jacketed CSST.Delete the section.
Attachment C
Significant Changes for the UPC
• New provisions for temperature limiting devices allows conforming water
heaters to be utilized for temperature limiting of the hot water. 407.3(2)
• New provisions for the required guardrails around equipment located on
elevated surfaces. 508.2.11
• New standard introduced for leak detection devices for water supply and
distribution. 606.8-606.9
• New design standard for potable water pumps. 609.8.1-609.8.2
• New design and installation standards for plastic DVVV piping. 701.2
• New design standard for cleanout fittings and caps. 707.2
• New requirements for circuit venting 911.2.1-911.5
Significant Changes for the IMC
• New standard for condensate line termination. 307.1.1, 307.2.1.1, 307.2.3.3
• New, more relaxed, standards for factory combustion/intake and exhaust.
401.4(3)
• New standards for whole-house ventilation. 403.2.1 Exceptions 2-2.2
• New standards for manicure/pedicure operations. 520.20
• New standards for clothes dryer exhausts. 504.4.1, 504.6
• New regulation for grease duct cleanouts 506.3.9(6,7)
• New requirements for polyurethane spray-foam. 602.2.2.1.8, 604.3
• New standards for fire and smoke dampers. 607.4.1-607.4.2
• Updated refrigerant tables. 1101.1.1, 1101.1.2, Table 1101.2