DC Water 2013 02 20-DIVP-MAG Presentation

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    District of Columbia Water and Sewer AuthorityGeorge S. Hawkins, General Manager

    Briefing on:

    Northeast Boundary NeighborhoodProtection Project

    Briefing for:

    McMillan Advisory Group

    February 21, 2013

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    Agenda

    Mayors Task Force

    Northeast Boundary NeighborhoodProtection Project (NEBNPP) Currently at Concept Design Stage

    McMillan Stormwater Storage

    First Street Tunnel

    Channing St Mining Shaft Staging Area

    2

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    District and DC Water Commitments for NEBNPP

    4 storms caused major

    flooding: July 10, 18, 19

    and Sept 2, 2012

    Mayor formed Task

    Force in Aug 2012

    Task Force report

    delivered end of Dec

    2012

    Over 25 Recommendations:

    Engineering MeasuresRegulatory Code ChangesOperations &

    MaintenancePublic

    Outreach

    3

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    Flooding Has Been A Chronic Problem

    Rhode Island Metro

    1st & P St NW

    1st & V St NWFlagler St NW

    Rhode Island & 1st St NWRhode Island & T St NW

    Rhode Island Ave Bet 1st & 2nd St

    Rhode Island & T St NW

    4

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    What Is the McMillan Stormwater Storage Project?

    Short term improvement Storage Capacity

    Up to 6 Million Gallons

    Construction Cost

    Approximately $12M

    In Service By

    March 2014

    5

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    Phase I - Sand Removal Operation

    Anticipated Start: Mid-February 2013

    Extended Work Hours

    Anticipated Duration:

    Mid-March 2013

    6

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    Phase II Construction of Diversion Structures

    Anticipated Start: June 2013

    Anticipated Completion:

    March 2014

    Traffic Coordination withDDOT:

    Ongoing

    7

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    First Street Tunnel Overview

    V St

    W St

    Adams St

    Bryant St

    U St

    Thomas St

    Michigan AveN

    1stS

    tN.

    Cap

    St

    23 Dia. Northeast

    Boundary Tunnel

    First Street Tunnel

    19 Dia tunnel, 2,800

    ft long, 6 mg storage

    Temp.

    Pumping

    Station

    Demolition of 2 sand

    Filters required for

    Construction

    McMillanReservoir

    8

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    DC Clean Rivers

    Tunnel Boring Machine

    First Street Tunnel

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    Tunnel Boring Machine(TBM) Constructs Tunnelfrom Below Ground

    18.5 Feet Min. Inside

    Diameter Over 100 Feet Deep

    2800 Linear Feet

    300 to 400 Feet ofTrailing Gear

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    10

    Channing Street Mining ShaftStreet Grade - Plan

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    11

    Channing Street Mining ShaftStreet Grade - Section

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    12

    Channing St Mining ShaftMaintain EL 170 - Plan

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    13

    Channing St Mining ShaftMaintain EL 170 - Section

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    What Are The Project Schedules?

    Proj. Activity 13 14 15 16 17 18 19 20 21 22

    1 McMillan Stormwater Storage

    2 First Street Tunnel

    3 Northeast Boundary Tunnel

    14

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    Next Steps

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    Historic Preservation Review Board Meeting March 28, 2013

    Complete Design

    Continue Public Outreach Program

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    Questions?

    Project EMail

    [email protected]

    NE Boundary Neighborhood Protection Project Website

    http://www.dcwater.com/mcmillan

    DC Clean Rivers Project Website

    http://www.dcwater.com/cleanrivers

    DC Clean Rivers Project Phone #

    (202) 787-4447

    16

    mailto:[email protected]://www.dcwater.com/mcmillanhttp://www.dcwater.com/cleanriversmailto:[email protected]:[email protected]://www.dcwater.com/cleanrivershttp://www.dcwater.com/mcmillanmailto:[email protected]
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    What Is The Clean RiversProject?

    Clean Rivers Project: Control combined sewer overflows to: Potomac River Anacostia River Rock Creek

    Meet nutrient discharge limits ofChesapeake Bay Program

    Relieve flooding the Northeast BoundaryArea

    Schedule: 2005-2025 Implemented under a Federal Consent

    Decree among: United States Environmental Protection

    Agency (US EPA) United States Department of Justice (US

    DOJ) District of Columbia DC Water

    17

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    What Is A CSO?

    18

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    What Are The Benefits Of The Projects?

    19

    100%

    50%

    20%

    10%7%

    4% 2% 1%0%

    10%

    20%

    30%

    40%

    50%

    60%

    70%

    80%

    90%

    100%

    1 yr 2 yr 5 yr 10 yr 15 yr 25 yr 50 yr 100 yrProbabi

    lityofOccurringinanyYear

    6-hour Duration NOAA Storm Return Interval

    Approx. capacityof current system

    Capacity provided by short &medium term improvements

    Capacity provided by long term improvements(Northeast Boundary Tunnel) Flooding is still

    possible for larger

    storms, but impact

    will be greatly

    mitigated.

    1.86" 2.25" 4.66"4.05"3.72"3.33"2.84" 5.33"