HomeMy WebLinkAbout10323RESOLUTION NO. 10323
A RESOLUTION APPROVING REVISIONS TO THE SANITARY SEWER DESIGN CRITERIA AND
POLICIES MANUAL FOR THE CITY OF PUEBLO DATED DECEMBER 22, 2003
WHEREAS, the City of Pueblo owns and operates a sanitary sewer collection system for the
purpose of collecting wastewater and transporting it to the water reclamation facility for treatment; and
WHEREAS, protecting public health and safety and preventing nuisance conditions requires
safe and efficient operation of the sanitary sewer system; and
WHEREAS, safe and efficient operation of the sanitary sewer system requires orderly and
well - planned expansion and rehabilitation of the system; and
WHEREAS, planning, efficient design, and orderly expansion require clearly documented
policies and engineering design criteria,
BE IT RESOLVED BY THE CITY COUNCIL OF PUEBLO, that:
SECTION 1.
Pursuant to and in furtherance of sections 4- 2 -2(i), 12- 4 -2(7), 12 -4 -5, 12- 4- 6(b)3(b) and 12-4 -
7U)5(b) of the Pueblo Municipal Code, the Council does hereby amend the Sanitary Sewer Design
Criteria and Policies for the City of Pueblo published December 22, 2003, by the Wastewater
Department, 211 East "D" Street, Pueblo, Colorado, a true copy of which is attached hereto
(hereinafter referred to as "Sanitary Sewer Criteria "). The design of sanitary sewer facilities within the
City after the date of approval of this Resolution shall be performed in conformance with said Sanitary
Sewer Criteria.
SECTION 2.
Except as modified by this Resolution, all minimum sanitary sewer design standards
heretofore adopted shall remain in full force and effect and be applicable to all subdivisions and re-
subdivisions approved prior to the date of approval of this Resolution.
SECTION 3.
After adoption of this Resolution, a true copy of the Sanitary Sewer Criteria shall be
maintained on file in the office of the City Clerk for public inspection. Copies of the Sanitary Sewer
Criteria shall be made available through the Wastewater Department for purchase by the public at a
moderate price.
INTRODUCED February 28, 2005
BY Michael Occhiato
Councilperson
APPROVED: zz'�'z
PR E CITY C IL
ATTESTED BY:
CITY CLERK
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Background Paper for Proposed
RESOLUTION
AGENDA ITEM # 3
DATE: FEBRUARY 28, 2005
DEPARTMENT: WASTEWATER
GENE MICHAEL, DIRECTOR
TITLE
A RESOLUTION APPROVING REVISIONS TO THE SANITARY SEWER
DESIGN CRITERIA AND POLICIES MANUAL FOR THE CITY OF PUEBLO
DATED DECEMBER 22, 2003.
ISSUE
Should the City Council approve a resolution adopting and approving revisions to
the Sanitary Sewer Design Criteria And Policies Manual for the City Of Pueblo
dated December 22, 2003?
RECOMMENDATION
Approval of Resolution
BACKGROUND
The Pueblo City Council has incorporated into the Municipal Code the policies on
sanitary sewer development, main extensions, and relief sewers. These policies
were previously contained in the Sanitary Sewer Development Criteria and
Policies Manual.
In order to avoid redundancy and confusion, the Sanitary Sewer Development
Criteria and Policies Manual is being amended by removing the previous
language on sanitary sewer development, main extensions, and relief sewer
policies, and replacing this language with references to the appropriate sections
of the Municipal Code.
FINANCIAL IMPACT
None
CHAPTER 2. SANITARY SEWER PLANNING CRITERIA
2.1 GENERAL POLICIES
General policies and guidelines will be followed in order to develop a Sanitary Sewer System
that will accommodate current and future needs of the City. The following addresses the major
issues related to the development of the City's Sanitary Sewer System.
The purpose of the provisions contained herein are to provide sound engineering and long -range
planning in the extension of the City's Sanitary Sewer System and promote the orderly
development of the City's Sanitary Sewer System.
2. 1.1 Development Polic
The sanitary sewer development policy for the City of Pueblo is set forth in Section 16.11.5-
3 of the Pueblo Municipal Code, as amended.
2.1.2 Main Extension Policy
The sanitary sewer main extension policy for the City of Pueblo is set forth in Section
16.11.5 -4 of the Pueblo Municipal Code, as amended.
2.1.3 Relief Sewer Policy
The policy for constructing relief sanitary sewer mains for the City of Pueblo is set forth in
Section 16.11.5 -5 of the Pueblo Municipal Code, as amended.
2.1.4 Street or Alley Vacations
Streets or alleys that have active sanitary sewer mains in them will not be considered for vacation
unless the sewer can be abandoned as a public sewer and it will not be used to serve future
development or expansions upstream of the abandoned sewer. At such time a public right -of-
way is vacated and a public sewer abandoned but continues to function as a private sewer main,
provisions shall be made for the maintenance and repair of the private sewer (i.e. covenants
and/or agreements).
2.2 DESIGN/PLANNING PERIOD
All improvements to the sanitary system shall be planned, designed, and constructed to provide
adequate service for a useful life of 50 years unless a longer or shorter useful life period is
stipulated or allowed by the Director of Public Works.
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When allowed or stipulated by the Director of Public Works, construction of proposed
improvements may be phased over a period of time (e.g., the pumping capacity of a lift station
may be phased to match development rather than initially set at the future rate).
2.3 POPULATION AND LAND USE PROJECTIONS
All improvements to the Sanitary Sewer System shall be planned and designed to provide
adequate service as specified by the following:
2.3.1. Planning Criteria for Sanitary Sewers
A. The area dedicated to each separate land use, calculated in acres, (such as single -
family, multi - family, commercial, and industrial) shall be determined based upon
the Master Development Plan.
B. Sanitary sewer impact shall be computed for the entire sewer drainage basin
including the proposed development. Mains shall be designed to adequately
accommodate the area as per criteria contained herein.
2.4 SANITARY SEWER FLOW COMPUTATION CRITERIA
2.4.1 Flow Factors
A summary of average and peak flow factors are summarized in the following table:
TABLE 2.1
SANITARY SEWER FLOW COMPUTATION CRITERIA FLOW FACTORS
Average Flow
Peak
Peak Flow
Land Use
"Per Acre" (1)
Factor
"Per Acre" (1)
CFS
MGD
CFS
MGD
Single - Family
0.0016
0.0010
2.6
0.0042
0.0027
Residential
Multiple - Family
0.0003
0.0002
2.6
0.0009
0.0006
Residential
per unit
per unit
per unit
per unit
Commercial
0.0015
0.0010
2.6
0.0040
0.0026
Industrial
0.0020
0.0013
2.6
0.0051
0.0033
High -Water Consuming
Special Study Required
Industries
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TABLE 2.1
SANITARY SEWER FLOW COMPUTATION CRITERIA FLOW FACTORS
(continued)
Average Flow
Peak
Peak Flow
Land Use
"Per Acre" (1)
Factor
"Per Acre" (1)
Institutional Use
Special Study Required
Areas Outside The
0.0017
0.0011
2.6
0.0044
0.0028
Development Plan
(Unplanned)
(1) Unless otherwise stated
2.4.2 Infiltration and Inflow
Identify and design for areas with a high potential for groundwater infiltration. Maximum
allowable infiltration/inflow (1/1) shall be in accordance with Article 12— Specifications for
Sanitary Sewers. Use 0.0003 cfs per acre for newly developed basins with low potential for
infiltration problems due to groundwater. Areas with high potential for groundwater infiltration
shall be determined by the City or by studies done for the area.
2.5 WASTEWATER PUMPING STATIONS
Wastewater pumping stations will only be employed when gravity flow is not feasible;
otherwise, pump stations will not be afforded planning consideration. The Engineer shall meet
with the City prior to preparing the Engineering Report for a pumping station.
2.5.1 Engineering Report
If a pumping station is to be considered, a detailed engineering report shall be submitted to the
Department of Public Works and shall include the following:
A. A brief description of the project and purpose.
B. A pumping station "feasibility study" which provides justification.
C. The engineering report shall elaborate on the following for both present and future
conditions:
Design period
2. Population densities per acre and total population
3. Acres of area(s) served (including a map of the area(s) to be served)
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4. Per capita wastewater contribution - average and maximum, (per Table
2.1)
5. Infiltration
6. Commercial and Industrial waste contributions
7. Design flow rates - average and maximum
8. Strength (BOD5 and TSS) of wastewater and industrial waste
characteristics
D. The report shall also address the following for both initial and future conditions:
1. Number, type, capacity, motor horsepower, phasing, voltage, and net
positive suction head (NPSH) requirements of proposed pumping units.
2. System head curve (including head computations) for the pumping system
3. System head calculations shall include the size and length of force main
and assumed C (Friction) factor.
4. Wastewater detention time in the wet well and force main.
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