06/03/2019-CC-Agenda Packet-Work SessionAGENDA
CITY COUNCIL WORK SESSION
MONDAY, JUNE 3, 2019
6:00 PM
502 ELM STREET
SANGER, TEXAS
1.Call Meeting to Order
2.Update WWTP
Discuss and Provide Update on the Wastewater Treatment Plant Project.
3.iSWM Presentation
Presentation on Integrated Stormwater Management (iSWM) by NCTCOG and Halff Associates,
Inc.
4.Bridge and Retaining Wall Aesthetics
Discuss Bridge and Retaining Wall Aesthetics Relating to the FM 455 and I35 Expansion Project.
5.Overview of Items on the Regular Agenda
6.Adjourn
I, the undersigned authority, do hereby certify that this Notice of Meeting was posted on the
City Website, and on the bulletin board, at the City Hall of the City of Sanger, Texas, a place
convenient and readily accessible to the general public at all times. Said notice was posted on the
following date and time, and remained posted continuously for at least 72 hours prior to the
scheduled time of said meeting and shall remain posted until meeting is adjourned.
05312019 at 10:30 AM
Cheryl Price City Secretary
City of Sanger, Texas
Date/Time Posted
This facility is wheelchair accessible and accessible parking spaces are available. Requests for additional
accommodations or interpretive services must be made 48 hours prior to this meeting. Please contact the City
Secretary's office at (940) 4587930 for further information.
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CITY COUNCIL AGENDA MEMO
AGENDA ITEM NO. 2.
AGENDA MEETING DATE: June 3, 2019
TO: Alina Ciocan, City Manager
FROM: Tracy LaPiene, City Engineer
ITEM/CAPTION:
Update WWTP
Discuss and Provide Update on the Wastewater Treatment Plant Project.
AGENDA TYPE: Work Session
ACTION REQUESTED: Presentation N/A
BACKGROUND:
N/A
LEGAL/BOARD COMMISSION RECOMMENDATIONS/CITIZEN NOTICE FEEDBACK:
N/A
FINANCIAL SUMMARY FUNDING/FISCAL IMPACT:
N/A
FUNDS:
N/A
STAFF RECOMMENDATION/ACTION DESIRED:
N/A
Page 2
CITY COUNCIL AGENDA MEMO
AGENDA ITEM NO. 3.
AGENDA MEETING DATE: June 3, 2019
TO: Alina Ciocan, City Manager
FROM: Muzaib Riaz, Planner, Development Services
ITEM/CAPTION:
iSWM Presentation
Presentation on Integrated Stormwater Management (iSWM) by NCTCOG and Halff Associates, Inc.
AGENDA TYPE: Work Session
ACTION REQUESTED: Presentation
BACKGROUND:
Integrated Stormwater Management is a Program by NCTCOG developed to provide alternative solutions for
stormwater managment as opposed to conventional stormwater controls. This Program may potentially be adopted into
the City of Sanger Subdivision Ordinance, either as an option along with conventional stormwater controls, or to a
degree that is in the best interest of the City of Sanger as determined by City Council, with the upcoming update of the
City's Subdivision Ordinance.
LEGAL/BOARD COMMISSION RECOMMENDATIONS/CITIZEN NOTICE FEEDBACK:
N/A
FINANCIAL SUMMARY FUNDING/FISCAL IMPACT:
N/A
FUNDS:
N/A
STAFF RECOMMENDATION/ACTION DESIRED:
N/A
ATTACHMENTS:
Page 3
CITY COUNCIL AGENDA MEMOAGENDA ITEM NO. 3.AGENDA MEETING DATE: June 3, 2019TO: Alina Ciocan, City ManagerFROM: Muzaib Riaz, Planner, Development ServicesITEM/CAPTION:iSWM PresentationPresentation on Integrated Stormwater Management (iSWM) by NCTCOG and Halff Associates, Inc.AGENDA TYPE: Work SessionACTION REQUESTED: Presentation BACKGROUND:Integrated Stormwater Management is a Program by NCTCOG developed to provide alternative solutions forstormwater managment as opposed to conventional stormwater controls. This Program may potentially be adopted intothe City of Sanger Subdivision Ordinance, either as an option along with conventional stormwater controls, or to adegree that is in the best interest of the City of Sanger as determined by City Council, with the upcoming update of theCity's Subdivision Ordinance.LEGAL/BOARD COMMISSION RECOMMENDATIONS/CITIZEN NOTICE FEEDBACK:N/A FINANCIAL SUMMARY FUNDING/FISCAL IMPACT:N/AFUNDS:N/ASTAFF RECOMMENDATION/ACTION DESIRED:N/A
ATTACHMENTS:
Description Upload Date Type
iSWM Program Tiered Measurement 5/29/2019 Backup Material
iSWM Presentation 5/29/2019 Backup Material
Page 4
North Central Texas Council of Governments
iSWM PROGRAM IMPLEMENTATION TIERED MEASUREMENT
September 2014
SUBMITTING COMMUNITY:
Requirements for Implementation Levels
Outcome Category Gold Silver Bronze
Mandatory 10 full application 10 full or partial application 10 full or partial application
Recommended 7 full application 7 full or partial application 4 full or partial application
Optional 3 full or partial application
Note: The following outcomes apply to land disturbing activities of 1 acre or more for water quality and streambank protection, and apply to all
land disturbing activities for flood mitigation and conveyance.
# Outcome
CHECK COMMUNITY’S
LEVEL OF APPLICATION Full Application iSWM Criteria
Manual Ref.
Equivalent Local
Criteria/Ordinance
Reference N/A Partial Full
MANDATORY OUTCOMES
1 Site Plan Review
Applicability
Stormwater requirements discussed at a pre-
development/pre-application meeting or equivalent
(Concept iSWM)
Section 2.2,
Step 3
2 Land Use
Conditions
Design stormwater infrastructure to fully-developed
(built-out) land use conditions
Section 3.6.1
3 Hydrologic
Methods
Limit Rational Method applicability to drainage
areas of 100 acres or less and utilize frequency
factors (per TM HO Table 1.4); Limit Modified
Rational Method applicability to drainage areas of
200 acres or less; For larger areas, require Unit
Hydrograph methodology
Section 3.1
Table 3.2;
TM HO Section
1.2*
4 Open Channel
Velocity
Criteria/Energy
Dissipation
Require maximum permissible channel velocity
criteria be met and/or use erosion control measures
for 1-, 25-, and 100-yr or similar storm events to
protect receiving drainage element from erosion
Section 3.6.3,
Table 3.10 and
3.11
5 Detention
Structure
Discharge
Criteria
When a detention structure is utilized, design
facility for fully-developed 1-, 25-, and 100-yr or
similar storm events matching pre-development
peak flows and velocities; Provide emergency
spillway with 6 inches of freeboard to convey fully-
developed 100-yr storm event assuming outlet
blockage
Section 3.6.3,
Detention
Structures
6 Streambank
Protection
Require downstream stabilization to prevent
erosive velocities; maintain existing downstream
velocity conditions with on-site controls; and/or
control fully-developed 1-yr, 24-hr storm event
release over 24 hours to prevent erosive velocities
Section 1.3,
Table 1.3;
Section 3.4
7 Flood Mitigation Require adequate downstream conveyance for peak
discharges; maintain existing downstream peak
discharge conditions with on-site controls; and/or
provide detention to pre-development peak
discharge conditions
Section 1.3,
Table 1.3;
Section 3.5.2
8 Construction
Controls
Limit erosion and the discharge of sediment and
other pollutants from construction sites by adhering
to the integrated Construction Criteria or
Construction General Permit
Section 4.0
9 Operations and
Maintenance
Define responsible party and requirements for
operation, maintenance, frequency of inspection,
and enforcement of temporary and permanent
stormwater controls and drainage facilities
Section 2.2,
Step 5
10 Downstream
Assessments
Confirm no negative impact or mitigate negative
impacts of peak discharges and velocities for 1-, 25-,
and 100-yr or similar storm events
Section 3.3;
TM HO Section
2.4*
TOTALS
Page 5
North Central Texas Council of Governments
iSWM PROGRAM IMPLEMENTATION TIERED MEASUREMENT
September 2014
RECOMMENDED OUTCOMES
11 Conveyance
Limits
25-yr fully-developed design storm or higher for:
streets, roadway gutters, storm drain pipe systems,
inlets on-grade and parking lots;
100-yr fully-developed design storm event for:
drainage in the right-of-way, drainage easements,
and road low points
Section 3.6.2
12 Storm Drain
Velocity Criteria
Limit velocity in pipes with minimum and maximum
values to prevent clogging and erosion
Section 3.6.1, Table
3.8
13 Spread Criteria Flow spread limits for various street classifications
for 25-yr storm event or higher
Section 3.6.2, Table
3.7
14 Freeboard
Criteria
Minimum of 1 foot of freeboard provided for the
fully-developed 100-yr storm event for culverts and
detention structures; Minimum of 2 feet of
freeboard for bridges for fully-developed 100-yr
storm event
Section 3.6.3
15 Finished Floor
Elevations
Minimum of 1-foot above fully-developed 100-yr
storm event water surface elevation or 2-feet above
effective FEMA base flood elevation
Section 3.7
16 Water Quality
Protection
Require integrated site design practices; treat the
water quality volume; and/or enact regional water
quality programs
Section 1.3, Table
1.3; Section 3.2
17 Drainage and
Floodplain
Easements
Required for all drainage systems that convey
stormwater runoff across property boundaries and
must include sufficient area for operation and
maintenance of the public drainage system
Section 3.7
TOTALS
OPTIONAL OUTCOMES
18 Open Channel
Stability Criteria
Design includes low-flow channel Section 3.6.3
19 Detention
Downstream
Timing Analysis
Confirm detention does not exacerbate peak flows
in downstream reaches
Section 3.5.2,
Option 3
20 Conservation
and Utilization
of Natural
Features and
Resources
Ordinances encourage preservation of natural
resources such as riparian buffers and/or natural
open space areas and utilization of natural design
features for stormwater conveyance
Section 3.2.2;
TM PL 2.2.1**
21 Lower Impact
Site Design
Techniques
Ordinances encourage reducing limits of clearing
and grading and limiting impervious cover per
integrated site design practices
Section 3.2.2;
TM PL 2.2.2**
22 TriSWM Incorporate practices for improving water quality of
runoff from public rights-of-way
TriSWM Appendix
TOTALS
*TM HO = iSWM Technical Manual, Hydrology Section **TM PL = iSWM Technical Manual, Planning Section
Tier Level Applied For: □GOLD □SILVER □BRONZE
___________________________________________ __________________________________________
Print Name and Title of Local Stormwater Authority Contact Phone Number and Email
___________________________________________ _________________
Signature of Local Stormwater Authority Date
For IIS Review Board Use Only:
Date of Submittal: Date of Request for Additional Information:
Date of Approval: Date Additional Information Received:
Approved Tier Level: Date Informational Letter Sent:
Page 6
SANGER, TX
NCTCOG
WORKSHOP
INTEGRATED DESIGN CRITERIA
JUNE 3, 2019
Page 7
WELCOME & INTRODUCTIONS
Page 8
ISWM OVERVIEW
iSWM Overview and Resources
Hydrologic Methods
Water Quality protection
Acceptable downstream conditions
Streambank protection
Flood mitigation
Stormwater conveyance systems
Easements, plat, and maintenance agreements
Stormwater control selection / detention
Integrated construction criteria
Each section REFERS to the iswm criteria manual
located here:
http://iswm.nctcog.org/Documents/iSWM_Criteria_Manual_01142015.pdf
Page 9
ISWM OVERVIEW
WHAT IS THE INTEGRATED STORMWATER
MANAGEMENT PROGRAM (ISWM)?
A regional program to assist local governments:
Manage stormwater impacts
Meet MS4 Permit requirements
Collaborative effort between:
60+ local governments
iSWM Subcommittee
Regional Public Works Council
Consultant team led by Halff Associates
Page 10
ISWM OVERVIEW
NATIONAL ISSUES
Clean Water Act
EPA Audits
EPA Rule Updates
National Requirements
Page 11
WHY ISWM?
Increased runoff leads to flooding
Streambank erosion
Water quality concerns
Stormwater regulations
Loss of natural features
Comprehensive approach needed
Regional consistency
Page 12
WHY ISWM?
Address stormwater early in the development process
Design for multiple storm events
Use integrated Site Design Practices
Reduce downstream impacts
➖Water quality
➖Streambank erosion
➖Flooding
Protect water quality during construction activities
Page 13
NCTCOG RESOURCES
Criteria Manual
• Municipalities apply at local level
Technical Manual
• Equations and Methods for
design
Tools and Training
• Archived training resources
Program Guidance
• Supplemental documents
iSWM Program
Page 14
ISWM COMMUNITIES
Roanoke
Southlake
Benbrook Dallas
Lakeside
Mansfield
Glenn
Heights
Northlake
Duncanville
University
Park
Azle Hurst
2006 2007 2008 2009 2010 2011 2012 2013 2014
Fort Worth
Grand Prairie
Outcome
Focused
Implementation
Page 15
TIERED IMPLEMENTATION
Page 16
Page 17
NCTCOG ISWM INVENTORY
Page 18
ISWM INVENTORY SUMMARY
Page 19
Page 20
CASE STUDY
Page 21
RAYZOR RANCH DEVELOPMENT
Rayzor Ranch North (officially Rayzor Ranch Marketplace), is a
100-acre parcel within the Rayzor Ranch development, a
privately-owned, 400-acre mixed-use development in Denton
Texas.
Key iSWM Features
➖Water Quality Pond
➖Bioretention
➖Pocket Wetland
➖Enhanced swale
➖Filter strip
Aesthetically pleasing, utilitarian in conveying drainage, and
environmentally responsible in the treatment of the water quality
for removing both on and off-site pollutants before discharging
the storm drainage
Page 22
CITY COUNCIL AGENDA MEMO
AGENDA ITEM NO. 4.
AGENDA MEETING DATE: June 3, 2019
TO: Alina Ciocan, City Manager
FROM: Ramie Hammonds, Development Services Director
ITEM/CAPTION:
Bridge and Retaining Wall Aesthetics
Discuss Bridge and Retaining Wall Aesthetics Relating to the FM 455 and I35 Expansion Project.
AGENDA TYPE: Work Session
ACTION REQUESTED: Presentation N/A
BACKGROUND:
Staff has worked with a graphic designer to create proofs for council consideration. The design(s) would be utilized in
the retaining walls and bridges that will be constructed during the FM 455 & I35 expansion. Staff would request
feedback on designs and guidance as to how council wishes to proceed.
LEGAL/BOARD COMMISSION RECOMMENDATIONS/CITIZEN NOTICE FEEDBACK:
N/A
FINANCIAL SUMMARY FUNDING/FISCAL IMPACT:
N/A
FUNDS:
N/A
STAFF RECOMMENDATION/ACTION DESIRED:
Staff would request feedback on designs and guidance as to how council wishes to proceed.
Page 23