Welcome! T his Me e ting will Be g in So o n T e c hno lo g y - - PowerPoint PPT Presentation

welcome
SMART_READER_LITE
LIVE PREVIEW

Welcome! T his Me e ting will Be g in So o n T e c hno lo g y - - PowerPoint PPT Presentation

Welcome! T his Me e ting will Be g in So o n T e c hno lo g y Ove rvie w T hing s to K no w Attendee video cameras are disabled (we cant see you) Attendee screen share is disabled All attendees are muted (instructions


slide-1
SLIDE 1

Welcome!

T his Me e ting will Be g in So o n

  • Attendee video cameras are disabled (we can’t see you)
  • Attendee screen share is disabled
  • All attendees are muted (instructions to unmute will be covered)
  • You can leave and rejoin the meeting at any time (unless the meeting

is at capacity or you are removed for inappropriate behavior)

  • Multiple opportunities for questions will be provided throughout the

presentation

  • Presentation and additional materials are available:

www.a2gov.org/LynAnne-ArbanaSewer

Please use this time to complete an optional, anonymous demographic questionnaire available on the project website.

T e c hno lo g y Ove rvie w – T hing s to K no w

slide-2
SLIDE 2

City of Ann Arbor Thursday, June 11, 2020

L yn Anne – Arb a na Sa nita ry Se we r

slide-3
SLIDE 3

T e c hno lo g y Ove rvie w – Ask a Que stio n/ Sha re a Co mme nt

Note: When you raise your hand, the host will enable your microphone. The host will disable your microphone after your question.

Introduction

Phone

  • Select *9 to raise your

hand

  • You will be identified by

the last 3 digits of your phone number

  • Raise Hand
  • You will be identified by the

name provided when you entered the meeting

  • Lower Hand if needed
  • Q&A
  • Type your question
  • Check Send Anonymously if

you do not want your name to be publicly visible with your Question

  • Click Send

Computer

Send Anonymously Please input your question

slide-4
SLIDE 4

Zo o m Me e ting No rms

  • Start on time . . . end on time.
  • Raise your hand to be recognized to talk; there will be one speaker

at a time

  • Move to a quiet area and silence any background sounds when

speaking

  • Speak loud and clear so everyone can hear
  • Everyone will be provided a chance to speak before a repeat

speaker

  • Be respectful of other ideas and perspectives – no finger pointing!
  • Try to differentiate between I know (facts) and I think (opinions).
  • Inappropriate written and/or verbal comment or language, including

personal attacks and accusations, will result in the attendee being removed from the meeting

Introduction

slide-5
SLIDE 5

F

  • llo w-up E

xpe c ta tio ns

  • Meeting summaries provided to participants no more than two

weeks after meeting.

  • Project team to submit deliverables in timely manner, as

promised.

  • Public engagement on this project is not a decision-making

process.

Introduction

slide-6
SLIDE 6

Ag e nda

  • 1. Introduction
  • 2. What is this Project?
  • 3. Project Background
  • 4. Sewer Route
  • 5. Going Forward
  • 6. Questions & Answers
slide-7
SLIDE 7

Pro je c t T e a m

Introduction

Kayla Coleman City of Ann Arbor Public Engagement Specialist Brian Slizewski City of Ann Arbor Project Manager

slide-8
SLIDE 8

Pro je c t T e a m

Introduction

Chris Elenbaas Stantec Project Manager Mackenzie Johnson OHM Advisors Project Engineer Charlie Fleetham Project Innovations Public Engagement West Erie Realty Solutions Easement Acquisition

slide-9
SLIDE 9

Wha t is this Pro je c t?

slide-10
SLIDE 10

L yn Anne – Arb a na Sa nita ry Se we r

What is this Project?

Replacement of 4,300 Feet of Existing Sanitary Sewer from the Maple Ridge Apartments to Arbana Drive Why is this necessary?

  • Address surcharging and maintenance issues
  • Continuation of past sewer projects from West Park to

Arbana Drive

  • Maintain a key natural corridor
  • Funded through the Development Offset Mitigation

Program (DOM) What has already been done?

  • Site Survey – Topo, Trees & Wetlands
  • Geotechnical Investigation including Soil Borings
  • Preliminary Design Report
  • Initial Plan Development
slide-11
SLIDE 11

E xisting Se we r L

  • c a tio n

What is this Project?

slide-12
SLIDE 12

Que stio nna ire

  • Were you aware there was an existing sanitary sewer through

the ravine?

  • If Yes – Raise Hand
  • Do you live adjacent to the route of the existing sewer?
  • If Yes – Raise Hand

What is this Project?

slide-13
SLIDE 13

Que stio ns

Note: When you raise your hand, the host will enable your microphone. The host will disable your microphone after your question.

What is this Project?

Phone

  • Select *9 to raise your

hand

  • You will be identified by

the last 3 digits of your phone number

  • Raise Hand
  • You will be identified by the

name provided when you entered the meeting

  • Lower Hand if needed
  • Q&A
  • Type your question
  • Check Send Anonymously if

you do not want your name to be publicly visible with your Question

  • Click Send

Computer

Send Anonymously Please input your question

slide-14
SLIDE 14

Pro je c t Ba c kg ro und

slide-15
SLIDE 15

E xisting Se we r L

  • c a tio n

Project Background

slide-16
SLIDE 16

E xisting Ve g e ta tio n

Project Background

slide-17
SLIDE 17

Pre vio us Studie s

  • 2013 Sanitary Sewer Wet Weather

Evaluation Project (SSWWE)

  • Evaluated system wide sewer

capacity

  • Identified 5 priority areas for

additional investigation

  • Included the Lyn Anne–Arbana area

Project Background

slide-18
SLIDE 18

Pre vio us Studie s

Project Background

  • 2018 Sanitary Sewer Improvements

and Preliminary Engineering Project (SSIPE)

  • Performed more in-depth flow

metering and modeling in these 5 areas

  • Developed preliminary engineering &

cost estimates for the City’s Capital Improvement Plan

slide-19
SLIDE 19

Sto rmwa te r in Sa nita ry Se we rs

  • The previous studies identified areas where stormwater was

getting into the sanitary sewer system.

  • Included the Lyn Anne – Arbana area
  • Sanitary sewer pipes are designed for expected sanitary

sewer flow, not stormwater flow.

  • Excessive stormwater entering the sanitary sewer system can

cause basement backups and sewer overflows.

Project Background

slide-20
SLIDE 20

Sto rmwa te r in Sa nita ry Se we rs

Project Background

OHM-ADVISORS.COM OHM-ADVISORS.COM

  • ARCHITECTS. ENGINEERS. PLANNERS.
  • ARCHITECTS. ENGINEERS. PLANNERS.

How stormwater gets into the sanitary sewer system

Infiltration: Connected footing drain Broken sewer lateral Root intrusion into lateral Cracked or broken pipe Inflow: Roof drain connection Uncapped cleanout Storm cross‐connection Deteriorated manhole

slide-21
SLIDE 21

Hydro g ra ph

Project Background

Large I/I Response

slide-22
SLIDE 22

Se we r Co nditio n

Project Background

slide-23
SLIDE 23

Se we r Mo de ling

  • Modeling is used to understand how

the sanitary sewer system performs during large rains

  • Based on real world data collected

from the sewers and rain gauges

  • A large rain event is used to identify

any sewer capacity constraints

Project Background

6258 6259

slide-24
SLIDE 24

Hydro g ra ph o f E xisting Se we r

Project Background

Flow more than double pipe capacity

slide-25
SLIDE 25

Wha t Ca n Ha ppe n

Project Background

slide-26
SLIDE 26

Mo de ling Re sults

  • The sewer between Lyn Anne Ct. and Arbana Dr. is
  • verloaded during large storms
  • This could cause flooding of basements and overflow at

maintenance covers into the ravine or backyards

Sewer Route

slide-27
SLIDE 27

E xisting Se we r Ca pa c ity During L a rg e Ra in E ve nt

Project Background

18” 12” 12” Doty Westwood Lyn Anne Wildwood 12” Wilton Arbana Revena 100% Full 80% to 99% Full Less than 80% Full Pipe Capacity

slide-28
SLIDE 28

E xisting Se we r Ca pa c ity During L a rg e Ra in E ve nt

Project Background

Sewer Pipe Ground Water Level Basement Level

Area for Potential Sewer Overflow

slide-29
SLIDE 29

Sewer Pipe Ground Water Level Basement Level

E xisting Se we r Ca pa c ity During L a rg e Ra in E ve nt

Project Background

slide-30
SLIDE 30

Po st Pro je c t Ca pa c ity During L a rg e Ra in E ve nt

Project Background

21” Doty Westwood Lyn Anne Wildwood Wilton Arbana Revena 21” 21” 100% Full 80% to 99% Full Less than 80% Full Pipe Capacity

slide-31
SLIDE 31

Po st Pro je c t Ca pa c ity During L a rg e Ra in E ve nt

Project Background

Sewer Pipe Ground Water Level 21” 21” 21”

Flow Contained within Sewer

slide-32
SLIDE 32

Po st Pro je c t Ca pa c ity During L a rg e Ra in E ve nt

Project Background

Sewer Pipe Ground Water Level

slide-33
SLIDE 33

Pro po se d Se we r Ro ute

slide-34
SLIDE 34

Pro po se d Se we r Ro ute

  • Proposed sewer generally follows existing sewer
  • Evaluated Alternate Routes along Dexter and Linwood

Sewer Route

slide-35
SLIDE 35

Se c tio n 1 – De xte r Ave

Sewer Route

slide-36
SLIDE 36

Se c tio n 2 – De xte r to Do ty

Sewer Route

slide-37
SLIDE 37

Se c tio n 3 – Do ty to We stwo o d

Sewer Route

slide-38
SLIDE 38

Se c tio n 4 – Ma ryfie ld Wildwo o d Pa rk

Sewer Route

slide-39
SLIDE 39

Se c tio n 5 – Wildwo o d to Re ve na

Sewer Route

slide-40
SLIDE 40

Se c tio n 6 – Re ve na to Arb a na

Sewer Route

slide-41
SLIDE 41

Pro je c t Cha lle ng e s

  • Environmental Impacts
  • Limit Natural Area Disturbance
  • Access
  • Construction & Future Maintenance
  • Park Impacts
  • Road Impacts
  • Easements

Sewer Route

slide-42
SLIDE 42

Co nstruc tio n I mpa c ts

  • Local road closures, access to residences will be maintained
  • Brief lane closures along Dexter Avenue
  • Tree removal
  • Construction noise, including generators for bypass pumping
  • Dust and debris
  • Maryfield Wildwood Park Closures

Sewer Route

slide-43
SLIDE 43

Co nstruc tio n Mitig a tio n Stra te g ie s

  • Limiting construction operations to minimize tree removal.
  • Trenchless sewer installation where feasible to reduce

surface impacts.

  • Monitoring the Contractor’s operations to keep noise and dust

levels within allowable limits.

  • Limiting the number of local roads closed at one time.
  • Coordination with Parks and Recreation for potential amenity

improvements within the Maryfield Wildwood Park.

Sewer Route

slide-44
SLIDE 44

E a se me nt Ac q uisitio n

  • Approximately 45 Permanent Easements Required
  • Some areas have existing easements, some do not
  • None are adequately sized to allow for proper maintenance
  • Generally 40 to 50 feet wide, varies with sewer depth
  • Most along rear property lines
  • Additional Temporary Construction Easements
  • Added width to allow large equipment access for construction.
  • City is coordinating the process through West Erie
  • Contact Property Owners Individually
  • In person or Remote Meetings

Sewer Route

slide-45
SLIDE 45

Go ing F

  • rwa rd
slide-46
SLIDE 46

E xpe c te d Pro je c t Sc he dule

  • Project Design – Completed by November 2020
  • Easement Acquisition – Starts July 2020
  • Bidding – December 2020
  • Begin Construction – Spring 2021
  • Construction Complete – Fall 2021

Going Forward

slide-47
SLIDE 47

Pub lic E ng a g e me nt Purpo se

  • The City desires a robust community engagement process as

part of the design of Lyn Anne-Arbana sewer.

  • It is vital to obtain resident and stakeholder input into the

design process and eventual construction of a new sewer.

  • Community engagement during the design will optimize the

design and construction plan.

Going Forward

slide-48
SLIDE 48

Oppo rtunitie s fo r Pub lic E ng a g e me nt

  • Three Public Meetings:
  • Meeting #1: June 11, 2020
  • Meeting #2: Late Summer 2020
  • Meeting #3: Fall 2020
  • Individual Meetings
  • As appropriate, focused on easements

Going Forward

slide-49
SLIDE 49

Ne xt Ste ps

  • Preparation of Detailed Design Documents
  • Refine through Public Feedback
  • Contact Regarding Easements
  • Provide Follow-up Information
  • E-mail Updates
  • Meeting Minutes and Project Updates on the Website

www.a2gov.org/LynAnne-ArbanaSewer

Going Forward

Brian Slizewski, PE City of Ann Arbor – Public Services – Engineering BSlizewski@a2gov.org (734) 794-6410 x43607

slide-50
SLIDE 50

Que stio ns a nd Answe rs

Note: When you raise your hand, the host will enable your microphone. The host will disable your microphone after your question. Phone

  • Select *9 to raise your

hand

  • You will be identified by

the last 3 digits of your phone number

  • Raise Hand
  • You will be identified by the

name provided when you entered the meeting

  • Lower Hand if needed
  • Q&A
  • Type your question
  • Check Send Anonymously if

you do not want your name to be publicly visible with your Question

  • Click Send

Computer

Send Anonymously Please input your question