The Binghamton-Johnson City Joint Sewage Board, having an approved
flow management plan, as recommended under a series of administrative
consent orders by the New York State Department of Environmental Conservation
(NYS-DEC) to manage and provide for treatment of wastewater flows,
is the local authority for the requirements of and implementation
of the infiltration/inflow offset program.
The effective date of this I/I Offset Program regulation is
January 1, 2013.
These terms and their definitions whenever used in this chapter
shall apply to only this chapter unless otherwise expressly stated
or required by subject matter of context:
AFFECTED OWNER
The owner whose sewage collection system will transport or
convey the wastewater from the new or modified sewer connection.
AFFECTED SEWERS
The sewer pipes that convey sewage from a new or modified
sewer connection.
APPLICANT
An entity that requests approval for a new or modified sewer
connection and/or sewer extension.
BANK ADMINISTRATOR
The Board or its designee. The bank administrator will manage
the sewer flow credit bank, and review and sign off on all approved
applications for flow credit creation, bank deposits, withdrawals
and transfers.
BOARD or JOINT SEWAGE BOARD
The Binghamton-Johnson City Joint Sewage Board, established
under the contract between the City of Binghamton and the Village
of Johnson City for the operation of the joint wastewater treatment
facilities. The term includes any duly authorized designee, agent,
or representative of the Board.
COMBINED SEWER OVERFLOW or CSO
The portion of flow from a combined sewer system (CSS) that
discharges into a water body from an outfall located upstream of the
headworks of a POTW, usually during a rainfall event; also, the outfall
pipe which carries this discharge.
CMOM PROGRAM
A capacity, management, operation and maintenance program
used by municipal users to operate and maintain their sewage collection
system.
DEFAULT
If a certificate of occupancy has not been issued within
one year from the time of issuance of the flow credit note or, if
later, within the additional time allowed for issuance of the certificate
of occupancy when extended as provided herein.
DEVELOPER
An applicant applying to make a new or modified sewer connection
and/or sewer extension, and which may or may not be responsible for
the construction of a new or modified sewer connection and/or sewer
extension and the construction of an I/I remediation project.
FEES IN LIEU OF MITIGATION
Money paid by an applicant into a fund so the applicant may
use available flow credits rather than funding and undertaking an
I/I remediation project.
FLOW CREDITS
Gallons per day of flow capacity available for proposed new
or modified sewer connections that are generated through I/I remediation
projects, which is a project that reduces infiltration and inflow
into the sewage collection system.
FLOW CREDIT HOLDER
The entity that owns the flow credits associated with a given
I/I remediation project.
FLOW CREDIT NOTE
An agreement between the Board and the applicant that flow
credits shall be made available to the applicant, developer, or a
municipal user under specific terms.
INFILTRATION
Water, other than sewage, that enters a sewage collection
system, (including sewer service connections) from the ground through
such means as defective pipes, pipe joints, connections, or manholes.
Infiltration does not include, and is distinguished from, inflow.
INFLOW
Water, other than sewage, that enters a sewage collection
system, (including sewer service connections) from sources such as
roof leaders; cellar drains; sump pumps; missing or defective cleanout
caps; swimming pools; yard drains; area drains; foundation drains;
drains from springs and swampy areas; manhole covers; cross connections
between storm sewers and sanitary sewers; catch basins; cooling towers;
stormwaters; surface runoff; street wash waters; or drainage. Inflow
does not include, and is distinguished from, infiltration.
I/I REMEDIATION BASIN
The sewage collection system, in its entirety that is tributary
to a particular component of the POTW, such as a CSO or pumping station.
I/I remediation basins represent the areas for which sewer connections
need to be offset by I/I reductions in the same area. An I/I remediation
basin may cross municipal boundaries.
I/I REMEDIATION PROJECTS
Specific projects (as described herein) including system
improvements, repairs, and upgrades that reduce I/I gallons conveyed
by the sewage collection system. Improvements, repairs and upgrades,
such as manhole sealing, pipe joint grouting and sewer lining are
considered I/I remediation projects under this program.
I/I REMEDIATION ENGINEERING REPORT
Refers to the document that provides information about the
scope of a project that is designed to remove infiltration and/or
inflow from the sewage collection system and provides an estimate
of the expected infiltration and/or inflow removal.
INTERMEDIATE MUNICIPAL USER
The municipal user whose sewage collection system will transport
or convey the new or modified sewage flow from the principal municipal
user's sewage collection system to the affected owner's
sewage collection system.
MUNICIPAL USER
A municipality or government entity which owns, or has jurisdiction
over, any public sewer which conveys wastewater to the treatment plant.
NEW OR MODIFIED SEWER CONNECTION
The construction of a new sewer connection to a sewer pipe
owned by an owner or municipal user tributary to the treatment plant,
or the modification of an existing sewer connection to a sewer pipe
owned by an owner or municipal user tributary to the treatment plant,
which would require an offset if it is defined as a sewer extension,
adding greater than 2,500 gallons per day of flow.
OFFSET RATIO
The ratio of required gallons of I/I removed from the sewage
collection system to the additional gallons allowed for new sewer
connections.
PRINCIPAL MUNICIPAL USER
The municipal user to whose sewage collection system the
new or modified sewer connection is being made.
PRIVATE SEWER
A sewer not owned or controlled by governmental agency, not
including lateral sewers.
PUBLICLY OWNED TREATMENT WORKS or POTW
A treatment works as defined by Section 212 of the Federal
Clean Water Act (33 U.S.C. § 1292). This definition includes
any directly or indirectly connected sewers and appurtenances that
convey wastewater to the wastewater treatment plant, but does not
include pipes, sewer laterals or other conveyances serving not more
than a single home development not connected directly to the POTW.
SANITARY SEWER OVERFLOW or SSO
A discharge of untreated wastewater from a sewage collection
system designed for sanitary sewage only, including infiltration and
inflow in excess of the capacity of the collection system, resulting
in untreated wastewater discharges from the sewage collection system.
SEWAGE
The water-earned domestic human or animal waste from residences,
industrial and commercial establishments, together with industrial
and commercial waste. Neither infiltration nor inflow are components
of sewage.
SEWAGE COLLECTION SYSTEM
All facilities for collecting, regulating, pumping, and transporting,
sewage. May be a sanitary sewer system or, where permitted by the
NYSDEC, a combined sewer system.
SEWER EXTENSION
Any and all sanitary sewer facilities, including sewer pipe
and manholes, and any fittings and connections related thereto which
are to become part of the POTW and which are anticipated to increase
flows in the sewer system by more than 2,500 gallons per day. It shall
also include, where applicable, all pumping stations, force mains,
and associated facilities.
WASTEWATER
Is the composite of all flow constituents conveyed in a sewer
including sewage and infiltration and inflow.
Applications for new or modified sewer connection(s) and/or
sewer extension(s) are required and shall be completed in accordance
with the new or modified sewer connection application program.
New or modified sewer connection sewage flow rates shall be
calculated in accordance with the new or modified sewer connection
application program.
The sewer flow credit bank (bank) is a mechanism administered
by the Board through which flow credits generated from the successful
completion of I/I remediation projects can be deposited, and then
withdrawn or transferred for new or modified sewer connections.
A. Flow credits shall only be used in the specific I/I remediation basin
in which they were generated. They are not transferable to another
I/I remediation basin, unless approved by the Board.
B. Once an I/I remediation project is certified complete, flow credits
generated by I/I remediation projects shall be deposited into a separate
subaccount within the bank for the use by the municipal user having
jurisdiction over the site of the I/I remediation project. A municipal
user may, at its sole option, grant, sell, or otherwise transfer flow
credits to entities other than the municipal user, whether on a case-by-case
basis or by operation of generally applicable local law, provided
that written notice of such transaction and/or local law is furnished
to the bank administrator.
C. If an I/I remediation project performed by any entity generates more
flow credits than necessary for a specific new or modified sewer connection,
then all excess flow credits will remain "on deposit" in the municipal
user's subaccount with no expiration date. A municipal user may,
at its sole option, grant, sell, or otherwise transfer flow credits
to entities other than the municipal user, whether on a case-by-case
basis or by operation of generally applicable local law, provided
that written notice of such transaction and/or local law is furnished
to the bank administrator.
D. Flow credits are subject to eminent domain; a municipal user having
jurisdiction over the I/I remediation basin can mandate that credits
"on deposit" in the name of a private entity generated in relation
to an I/I remediation project within such municipal user's boundaries
shall be "condemned" for a "public purpose."
E. Flow credits shall be denominated in gallons per day.
F. The quantity of flow credits required for a new or modified sewer
connection shall be equal to the estimated peak sewage flow rate increase
for the specific new or modified sewer connection, referred to as
a one-to-one offset ratio.
G. The transfer of flow credits between municipal users and other entities
shall be allowed. The bank administrator shall have no obligation
to process a transfer or sale of flow credits in the absence of documentation
found by it to be proper documentation of the transaction, such as
notarized bill of sale or memorandum of gift or grant describing the
transaction. While in an "on deposit" status in the bank, flow credits
shall have no monetary value, accrue no interest, and may not be assigned
or pledged as collateral.
H. Flow credit withdrawal and use in relation to an application shall
be:
(1) Subject to approval of the bank administrator based on demonstration
by the applicant of adequate hydraulic and treatment capacity in the
sewage collection system and treatment plant in relation to the application
under the new or modified sewer connection application program, of
these rules and regulations.
(2) Approval for the new or modified sewer connection under the new or
modified sewer connection application program, of these rules and
regulations.
I. The existence of flow credits "on deposit" or posted to the account
or subaccount of any entity creates no "vested rights" or entitlement
whatsoever to make a new or modified sewer connection until all requirements
and conditions applicable at the proposed new or modified sewer connection
site are satisfied in the judgment and discretion of the governmental
entity having jurisdiction thereof.
The following infiltration and inflow quantification guidelines
are to be used by all entities subject to this I/I Offset Program
to calculate infiltration and inflow removed from the system by I/I
remediation projects. The quantification of infiltration and inflow
shall be prepared by a professional engineer, licensed in the State
of New York, and presented in an I/I remediation engineering report.
A. Determining infiltration flow contribution for specific defects shall
be according to the guidelines shown on Table 174-19.3.
B. As specified in the table, inflow flow contribution for specific
defects shall be determined according to the Natural Resources Conservation
Service methodology Technical Release 55 (TR-55). The table presents
a list of recommended curve numbers to be used in the TR-55 calculation.
(1) In order for a sewer separation project to be qualified for flow
credits, the new separated stormwater system must be conveyed to a
receiving water and not redirected back to the combined sewer system
in any way.
Table 174-19.1: Infiltration Guidelines
|
---|
Problem Type
|
Contribution
(gpm)
|
Reference
|
---|
Manholes
|
Joint leaks - Paved areas(1)
|
Heavy - 1.1 gpm(1)
Moderate - 0.65 gpm(1)
Minor - 0.27 gpm(1)
or
To be determined on a case-by-case basis(2)
|
ASCE Manual of Practice No. 92
|
Joint leaks - Unpaved areas(1)
|
Heavy - 4.6 gpm(1)
Moderate - 2.3 gpm(1)
Minor - 1.1 gpm(1)
or
To be determined on a case-by-case basis(2)
|
ASCE Manual of Practice No. 92
|
Defective covers/Frames exposed to surface water
|
To be determined on a case-by-case basis(2)
|
|
Pipe segments
|
To be determined for each specific project by using calculations,
flow metering, and/or televised inspection and data from previously
completed studies(2)
|
|
Laterals/Other connections
|
To be determined for each specific project by using calculations,
flow metering, and/or televised inspection and data from previously
completed studies(2)
|
|
NOTES:
|
---|
(1)
|
Based on condition of manhole. "Heavy" means severe cracks and
cracks throughout manhole. "Moderate" means moderate cracks within
manhole. "Minor" means minor cracks within manhole.
|
(2)
|
Calculations must be prepared by a New York State licensed professional
engineer.
|
|
Table 174-19-2: Inflow Guidelines
|
---|
|
Problem Type
|
Contribution
|
Reference
|
---|
|
Sump pumps
|
5 gpm(1)
|
Gould's model ST51 at 20 feet of head pressure
|
|
Roof drains, catch basins, drainage through manhole covers,
cross connections and sewer separation projects.
|
To be calculated based on Natural Resources Conservation Service
methodology TR-55. The 1-year, 24-hour storm event utilizing the Type
II Standard Rainfall Distribution will be used. 1-year storm rainfall
amount is 2.1 inches for City of Binghamton per Northeast Regional
Climate Center.
|
TR-55
|
|
NOTES:
|
---|
|
(1)
|
Based on 5 gpm over a twenty-four-hour-per-day period.
|
Table 174-19.3: Curve Numbers for Use in Runoff Calculations(1)
|
---|
Cover Description
|
|
Curve Numbers for Hydrologic
Soil Group
|
---|
Cover Type and Hydrologic Condition
|
Average Percent
Impervious Area
|
A
|
B
|
C
|
D
|
---|
Open space (lawns, parks, golf courses, cemeteries, etc.)
|
|
|
|
|
|
|
Poor condition (grass cover <50%)
|
|
68
|
79
|
86
|
89
|
|
Fair condition (grass cover 50% to 75%)
|
|
49
|
69
|
79
|
84
|
|
Good condition (grass cover >75%)
|
|
39
|
61
|
74
|
80
|
Impervious areas:
|
|
|
|
|
|
|
Paved parking lots, roofs, driveways, etc. (excluding right-of-way)
|
|
98
|
98
|
98
|
98
|
Streets and roads:
|
|
|
|
|
|
|
Paved; curbs and storm sewers (excluding right-of-way)
|
|
98
|
98
|
98
|
98
|
|
Paved; open ditches (including right-of-way)
|
|
83
|
89
|
92
|
93
|
|
Gravel (including right-of-way)
|
|
76
|
85
|
89
|
91
|
|
Dirt (including right-of-way)
|
|
72
|
82
|
87
|
89
|
Urban districts:
|
|
|
|
|
|
|
Commercial and business
|
85
|
89
|
92
|
94
|
95
|
|
Industrial
|
72
|
81
|
88
|
91
|
93
|
Residential districts by average lot size:
|
|
|
|
|
|
|
1/8 acre or less (town house)
|
65
|
77
|
85
|
90
|
92
|
|
1/4 acre
|
38
|
61
|
75
|
83
|
87
|
|
1/3 acre
|
30
|
57
|
72
|
81
|
86
|
|
1/2 acre
|
25
|
54
|
70
|
80
|
85
|
|
1 acre
|
20
|
51
|
68
|
79
|
84
|
|
2 acres
|
12
|
46
|
65
|
77
|
82
|
Table 174-19.3: Curve Numbers for Use in Runoff Calculations
(Continued)(1)
|
---|
Cover Description
|
Curve Numbers for Hydrologic
Soil Group
|
---|
Cover Type
|
Hydrologic Condition
|
A
|
B
|
C
|
D
|
---|
Pasture, grassland, or range - continuous forage for grazing
|
Poor
|
68
|
79
|
86
|
89
|
|
Fair
|
49
|
69
|
79
|
84
|
|
Good
|
39
|
61
|
74
|
80
|
Meadow - continuous grass, protected from grazing and generally
mowed for hay
|
—
|
30
|
58
|
71
|
78
|
Brush - brush-weed-grass mixture with brush the major element
|
Poor
|
48
|
67
|
77
|
83
|
|
Fair
|
35
|
56
|
70
|
77
|
|
Good
|
30
|
48
|
65
|
73
|
Woods - grass combination (orchard or tree farm)
|
Poor
|
57
|
73
|
82
|
86
|
|
Fair
|
43
|
65
|
76
|
82
|
|
Good
|
32
|
58
|
72
|
79
|
Woods
|
Poor
|
45
|
66
|
77
|
83
|
|
Fair
|
36
|
60
|
73
|
79
|
|
Good
|
30
|
55
|
70
|
77
|
Farmsteads - buildings, lanes, driveways, and surrounding lots
|
—
|
59
|
74
|
82
|
86
|
NOTES:
|
---|
(1)
|
United States Department of Agriculture, Urban Hydrology for
Small Watersheds, TR-55.
|
Municipal users and the Board shall maintain records of all
information resulting from the I/I offset program for a minimum of
three years, whether or not such information was required by the program.
The period of retention shall be extended during the course of any
unresolved dispute. The records shall be made available for inspection
and copying by the Board.
Each municipal user shall retain records as to the status of
the implementation and management of I/I remediation projects within
its jurisdiction under this I/I Offset Program and submit them to
the bank administrator on at least an annual basis. The Board will
make provisions for these records to be retained and made available
for public inspection by regulatory agencies and other interested
parties as to the status of the implementation and management of this
I/I Offset Program. Records shall include the following information:
A. Prioritized list of identified/available I/I remediation projects
in the municipal users' public sewage collection systems and
private property.
B. I/I remediation projects completed on the municipal users' public
sewage collection systems and private property within its incorporated
boundaries, describing the remediation work performed and estimated
I/I removed. If not previously furnished, provide completed certification
letter for I/I remediation projects completed. (See Appendix A for
letter format.)
C. List of applications for proposed new or modified sewer connections
and sewer extensions to the municipal users' public sewer systems.
D. List of new or modified sewer connections and sewer extensions completed
since January 1, 2013, the date when this program went into effect.
The provisions of Article IV of the Joint Sewage Treatment Plant
Law and Article 3 of the Joint Sewage Treatment Plant Law Rules and
Regulations shall govern all matters proceeding pursuant to this article.