Huntington Levee Community Meeting Department of Public Works and - - PowerPoint PPT Presentation

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Huntington Levee Community Meeting Department of Public Works and - - PowerPoint PPT Presentation

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Huntington Levee Community Meeting Department of Public Works and Environmental Services October 26, 2016 Huntington Levee Agenda I. Project Background II. Levee System Design III. Construction IV. Community Amenities V. Flood

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SLIDE 1

Department of Public Works and Environmental Services

Huntington Levee

Community Meeting

October 26, 2016

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SLIDE 2

Building Design and Construction Division 2

Agenda

Huntington Levee

I. Project Background II. Levee System Design III. Construction IV. Community Amenities V. Flood Modeling Results VI. Permitting VII. Schedule

  • VIII. Environmental Design

IX. Community Outreach X. Questions

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SLIDE 3

Building Design and Construction Division 3

Project Background

  • June 2006 -160 homes were

flooded from a storm event

  • 2009 – US Army Corps of

Engineers (USACE) completed a study to evaluate flood damage reduction measures in the Huntington Community

  • November 6, 2012 – Fairfax County voters approved stormwater

bond referendum

  • November 2013 – Phase I design completed
  • January 2014 – Fairfax County and Huntington Community reached

consensus on conceptual design features

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SLIDE 4

Building Design and Construction Division 4

Project Background

  • July 2014 – Hydraulic and Hydrologic Modelling for Cameron Run
  • September 2014 – Schematic (30%) Design
  • October 2014 - Value Engineering Workshop
  • June 2015 – Design Development (60%) Design
  • February 2016 – Construction Documents (100%) Design
  • Spring 2016 – Technical review by County and Corps of Engineers
  • July 2016 – CLOMR approved by FEMA
  • August 2016 – Project advertised for bid to pre-qualified contractors
  • September 2016 – Wetlands permitting approved by DEQ and Corps of

Engineers

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SLIDE 5

Building Design and Construction Division 5

Levee System Design

Levee System

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SLIDE 6

Building Design and Construction Division 6

Levee System Design

Key Design Features

  • Earthen Levee/I-Wall Combination
  • Pump Station
  • Stormwater Diversion
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SLIDE 7

Building Design and Construction Division 7

Levee System Design

Rendering – Looking West

Levee I-Wall Open Channel Ponding Area Cameron Run

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SLIDE 8

Building Design and Construction Division 8

Levee System Design

Rendering – Looking East with Cross Section

Asphalt Trail Open Channel with Drains Ponding Area Ponding Area Slope Slope Slope Sloped to Pump Station

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SLIDE 9

Building Design and Construction Division 9

Levee System Design

Rendering – Looking East from Top of Levee Trail

Asphalt Trail Concrete I-Wall Ponding Area

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SLIDE 10

Building Design and Construction Division 10

Levee System Design

Rendering – Looking Northeast Toward Pump Station

Note: Fence with gate to be constructed around Pump Station

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SLIDE 11

Building Design and Construction Division 11

Levee System Design

Rendering – Cross Section of Pump Station

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SLIDE 12

Building Design and Construction Division 12

Construction

Next Steps in Construction

Bids Opened Bid Evaluation County Approval of Contract Notice of Award Notice to Proceed October 6, 2016 October 2016 November 2016 December 2016 January 2017

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SLIDE 13

Building Design and Construction Division 13

Construction

Key Activities during Construction

Notice to Proceed Site Management Plan Contractor Mobilization Substantial Completion January 2017 January/ February 2017 January/ February 2017 February 2019

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SLIDE 14

Building Design and Construction Division 14

Site Management Plan

  • Submitted by contractor 30 days after NTP
  • Approved by County

Included in Site Management Plan

  • Phasing of Construction
  • Control of Water
  • Emergency Response

Construction

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SLIDE 15

Building Design and Construction Division 15

Contractor Restrictions

  • Construction activities limited to 7:00am to 7:00pm, Monday – Friday
  • Weekend and holiday work to be approved by County
  • Contractor parking prohibited in neighborhood
  • Truck traffic through neighborhood restricted
  • Noise per Fairfax County Noise Ordinance

Construction

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SLIDE 16

Building Design and Construction Division 16

Construction

First Construction Activities

  • Identification of Limits of Disturbance
  • Safety Fencing
  • Erosion and Sediment Control
  • Construction of Access Road
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SLIDE 17

Building Design and Construction Division 17

Construction

Construction Extents

For General Reference – Actual Extent determined by Contractor

Construction Safety Fence around Site Perimeter Construction Access Road Utility Work Location of Pump Station

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SLIDE 18

Building Design and Construction Division 18

Construction

Construction Access

  • Route A: Primary Construction Access
  • Route D: Secondary Access for Pump Station
  • Routes B and C: Possible Tertiary Construction Access
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SLIDE 19

Building Design and Construction Division 19

Community Amenities

Trails

  • Native Grasses in Ponding Area, Mowed 1-3 times per Year
  • Coarse Turf Grass on Levee

Trail Atop Levee Trail in Ponding Area Pump Station Existing Trail Service Drive

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SLIDE 20

Building Design and Construction Division 20

Community Amenities

Playground Area in Farrington Park

  • Worked with Community Group in Fall 2015
  • Separate Equipment for Age Groups
  • Construction in December 2016/ January 2017
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SLIDE 21

Building Design and Construction Division 21

Community Amenities

Playground Area in Farrington Park – Proposed Design

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SLIDE 22

Building Design and Construction Division 22

Flood Modelling Results

Protection of Homes from 100-Year Storm

Flood elevation 1-ft below lowest home opening

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SLIDE 23

Building Design and Construction Division 23

Flood Modelling Results

100-year Stormwater Ponding

Some Street Flooding, but Water Surface Elevation Below Structures

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SLIDE 24

Building Design and Construction Division 24

Flood Modelling Results

25-year Stormwater Ponding

Some Street Flooding, but Water Surface Elevation Below Structures

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SLIDE 25

Building Design and Construction Division 25

Flood Modelling Results

10-year Stormwater Ponding

Some Street Flooding, but Water Surface Elevation Below Structures

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SLIDE 26

Building Design and Construction Division 26

Permitting Update

All Permitting Completed

  • Joint Permit Application (Wetlands)
  • Conditional Letter of Map Revision (CLOMR)
  • DEQ Stormwater Permit
  • Building Permit
  • Site Permit
  • Zoning
  • Floodplain Study
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SLIDE 27

Building Design and Construction Division 27

Permitting Update

Permitting Requirements

  • Construction Limits marked

with 4-foot tall orange fencing

  • Non-impacted surface waters

with 50-feet of construction limits clearly demarcated

  • Monthly DEQ inspection

checklist

  • Inspections by DEQ and US

Army Corps of Engineers

Tree Preservation Areas Levee

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SLIDE 28

Building Design and Construction Division 28

Schedule

  • Phase II (January 2014-Winter 2017)

 Schematic Design (30%)  Design Development (60%)  Permitting (began March 2015)  Land Acquisition (began September 2014)  Construction Documents

  • Bidding
  • Phase III (Winter 2017-Spring 2019)
  • Construction

Project Remains on Schedule

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SLIDE 29

Building Design and Construction Division 29

Environmental Design Envision

  • Rating System for Infrastructure Projects
  • Bronze Level
  • Similar to LEED
  • 5 Categories:
  • Quality of Life
  • Leadership
  • Resource Allocation
  • Natural World
  • Climate and Risk
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SLIDE 30

Building Design and Construction Division 30

Community Outreach

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SLIDE 31

Building Design and Construction Division 31

Community Outreach

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SLIDE 32

Building Design and Construction Division 32

Community Outreach

  • Bi-annually
  • Important Milestones
  • Next Community meeting – Spring 2017

Community Meetings

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SLIDE 33

Building Design and Construction Division 33

Community Outreach

  • Similar to current response
  • Contractor responsible to maintain current condition (no

worse)

  • Temporary pumping as needed
  • Contractor will be notified when County dispatches to site

Storm Events

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SLIDE 34

Building Design and Construction Division 34

Community Outreach

 Contact Information – Huntington Levee Project

  • Phone #: 703-324-5800
  • Email address: HuntingtonLevee@fairfaxcounty.gov

 Huntington Levee Website:

www.fairfaxcounty.gov/dpwes/huntingtonlevee

To request this document in an alternate format call 703-324-5800, TTY 711.