STORMWATER MANAGEMENTFY 2017 – FY 2026 CIP

Pages F-30 through F-50

Stormwater Master Plan

• Adopted by County Board in September 2014

• Broad, multi-year community engagement process began in 2011

• Incorporates 3 technical needs assessment studies that identified priorities and led to current CIP project proposals:

Stream inventory (Completed, 2011)

Watershed retrofit plans (Completed, 2013)

Storm sewer capacity analysis (Seven priority basins completed in 2013)

2

Stormwater Management Goals

• Protect public health, safety, and property

• Reduce impacts of urban development on water quality to protect local streams, the Potomac River, and the Chesapeake Bay

• Comply with state and federal regulations

Stormwater Management Program

3

Comprehensive Program

• Reduce risks to public/private property from flooding

• Maintain and replace stormwater infrastructure

• Restore stream corridors

• Implement watershed retrofits over long-term

• Require on-site stormwater controls for new development

• Implement urban housekeeping ‘best practices’ (e.g., street sweeping, catch basin cleaning, pollution prevention, etc.)

• Outreach, education, and monitoring

(Green = Capital-funded program elements)

4

Stormwater Permit & Bay Cleanup Requirements

• Current Municipal Separate Storm Sewer System (MS4) Permit (2013-2018) requires 5% reduction by 2018 in Arlington’s share of Chesapeake Bay nutrient and sediment loads

• Arlington exceeded the required 5% load reduction in FY15, 3 years ahead of schedule Nitrogen: reduced 5.3% Phosphorus: reduced 17% Sediment: reduced 13%

5

Future Bay Cleanup Requirements

• Further progress expected with planned FY17-FY19 projects: Nitrogen: reduced 18% Phosphorus: reduced 35% Sediment: reduced 29%

• Required progress by FY23 at end of next permit cycle (2018-2023) = 40% reduction

• We are in good shape for next permit cycle, BUT… EPA will evaluate overall Bay

restoration progress in 2017/18 More nutrient & sediment

reductions may be required

6

Path Forward for Compliance

• Maintain a fiscally responsible, realistic, and sustainable strategy:

• Increase level of effort and supporting resources in rational and incremental steps

• Focus on high priority projects identified through Stormwater Master Plan

• Use nutrient credits from Water Pollution Control Plant to extend compliance deadline as necessary to maintain a sustainable level of project execution – likely during or at end of next permit cycle.

7

CIP and Stormwater Fund Assumptions

• Future operating and capital needs for to meet Bay TMDL requirements should be better known by the next CIP (FY19-FY28) – not assumed in this CIP

• Given future MS4 requirements, will likely need a review of the Stormwater Fund rate during this CIP planning horizon

• Premature to project timing or magnitude until major projects expected to be constructed by end of FY19 are completed and expenditures known relative to the balance, operating costs, and incoming additional revenues

• Additional uncertainties include: completion of EPA’s Bay TMDL mid-point assessment re-issuance of Arlington’s next MS4 permit in June 2018

8

Capital Funding & Project Delivery Capacity

• Stormwater Program working to align funding and project delivery capacity with FY15 and FY17 budgets: 2 FTEs for project management, 4 FTEs for engineering, and 1 FTE for

construction management

Need 1 additional engineering FTE to complete the team

Use of contract resources to supplement engineering and construction management capacity is another tool to be used

External delivery barriers include acquisition of easements and 3rd party utility relocation schedules

• SW Fund - recent FTE history:

Through FY14: 26 FTEs

FY15: +11 FTEs 37 FTEs

FY17: +5 FTEs 42 FTEs

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• Proposed Stormwater CIP totals $53.7M

• Stormwater program fully supported by dedicated Sanitary District tax adopted in 2008 Current rate = $0.013/$100 assessed property

value

10 Year Summary (in $1,000s)

5,633 6,326

1,592 1,640 1,688 1,738 1,792 1,844 1,900 1,958

1,000

2,380

1,061 1,093 1,126 1,159 1,194 1,230 1,267 1,305

2,800

3,378

4,403

546 563 580 597 615 633 652

9,433

12,084

7,056

3,279 3,377 3,477 3,583 3,689 3,800 3,915

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

FY 17 FY 18 FY 19 FY 20 FY 21 FY 22 FY 23 FY 24 FY 25 FY 26 Environmental Quality Projects Stormwater Maintenance Capital Stormwater Drainage Improvements Total Capital Expenditure

CIP Funding Overview

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Stormwater ProgramAllocations(in $1,000s)

Funding Sources(in $1,000s)

Environmental

Quality Projects, $31,070Stormwat

er Capital Maintenance, $5,750

Stormwater

Infrastructure

Projects, $24,460

Resource Allocation

Environmental Quality Projects

$26,111Stormwater

Maintenance Capital $12,815

Stormwater Drainage

Improvements$14,767

New CIP Funding$28,679

Previously Approved CIP

Funding $25,014

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Stormwater – Environmental Projects (pg. F-33)

10 Year Programmed Summary (in $1,000s)

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Accomplishments and Moving Forward

• 8th Street South bioretention facility constructed FY15

• Project design, easement acquisition, & procurement for large portfolio, representing many years of advance planning and design

• Construction of major watershed retrofit and stream restoration projects expected FY17 - FY19, including: Four Mile Run tidal restoration Williamsburg Boulevard median – Phase I/II

watershed retrofits John Marshall Drive/N Kensington Street watershed

retrofits Windy Run stream restoration Donaldson Run Tributary B stream restoration Ballston Pond retrofit

Approximately $12M of construction during this time period

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FY20 and Beyond

• Design and construction of additional stormwater retrofit and stream restoration projects based on Stormwater Master Plan

• Specific project identification and scoping underway; next CIP will show additional projects

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Stream Restoration Implementation

UnrestoredDonaldson

Run Tributary

RestoredDonaldson

Run Tributary

• Multiple projects, $13.2M• Major driver is MS4 Permit/Bay

TMDL• Infrastructure protection is an

important goal• Challenging and time-consuming

to design and construct• Multiple community benefits

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Watershed Retrofit Implementation

• Multiple projects, $12.9M

• Major driver is MS4 Permit & Bay TMDL

• Challenging, time-consuming, and expensive to design and build

• Maintenance essential

• Multiple community benefits

• Public engagement is key to success

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17

• Project re-designed to satisfy Corps of Engineers’ flood control channel capacity requirements

• Includes stream bank naturalization, ‘living shoreline,’ and improved access

• Additional re-design completed to lower costs and improve construction access (only 1 bid received for original procurement spring 2015)

• CIP cost estimate $4.0M• Construction bid with contingency

$3.5M (June 2016 CB meeting)• State and Tribal Assistance Grants

(STAG) will offset 55% of construction cost, up to maximum grant amount of $1.74M

Four Mile Run Tidal Restoration Project

Stormwater – Drainage Improvements (pg. F-47)

10 Year Programmed Summary (in $1,000s)

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Accomplishments (FY 2015 - FY 2016)

Stormwater Management ProgramStormwater Infrastructure• Lower Long Branch @ Columbia Pike –

approx. 520 linear feet of culvert extension

• Five storm sewer projects to address local drainage issues in the public right of way or public easements – approx. 640 linear feet

• Six projects to replace corrugated metal pipe – approx. 1900 linear feet

• Six underdrain projects to address groundwater and sump pump water issues in the public right of way – approx. 2,394 linear feet

• One improvement project to address storm sewer collapse at intersection of 32nd Street South and South Utah Street

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Flood Risk Reduction Studies

Lower Long Branch

Little Pimmit Run Tributary

Gulf Branch

Doctor’s Branch

Donaldson Run

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Implementation Targets (FY 2017 - FY 2026)

Stormwater Infrastructure• Sycamore Street & 24th Street (Project CR2)• West Little Pimmit Run – Phases I & II (Project LPW3)• 9th Rd North between North Livingston Street & North Liberty Street • Windy Run - 2500 North Kenmore Street to 2538 26th Street North• Donaldson Run – 24th Road North to North Upland Street to Military

Road, continuing to the George Washington Parkway (floodplain analysis only)

• Lower Long Branch Flood Risk Reduction Project

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Stormwater – Maintenance Capital (pg. F-45)

10 Year Programmed Summary (in $1,000s)

Stormwater Management Program

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Maintenance Capital Projects

• Four Mile Run Flood Control Project flood wall repairs

• Rehabilitation/replacement of corrugated metal pipe

• Rehabilitation/replacement of terra cotta pipe• Outfall repairs/ utility crossings• Local drainage issues

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Program Funding Sources (in $1,000s)

Project Name FY 17 FY 18 FY 19 FY 20 FY 21 FY 22 FY 23 FY 24 FY 25 FY 2610 Year

Total

Environmental Quality Projects 5,633 6,326 1,592 1,640 1,688 1,738 1,792 1,844 1,900 1,958 26,111

Stormwater Infrastructure Projects 2,800 3,378 4,403 546 563 580 597 615 633 652 14,767

Stormwater Maintenance Capital 1,000 2,380 1,061 1,093 1,126 1,159 1,194 1,230 1,267 1,305 12,815

Total Recommendation 9,433 12,084 7,056 3,279 3,377 3,477 3,583 3,689 3,800 3,915 53,693

10 Year Programmed Summary (in $1,000s)

Stormwater – Program Funding Summary (pg. F-32)

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D

1

4

STORMWATER PROJECTS

3

C

6

7

B

5

2

10

F

12

E

8

9

A

LEGEND

STORMWATER- ENVIRONMENTAL PROJECTS

STORMWATER- MAINTENANCE CAPITAL & DRAINAGE IMPROVEMENTS PROJECTS

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Key Project Name

1 Four Mile Run tidal restoration 2 Ballston Pond watershed retrofit 3 Williamsburg Boulevard median watershed retrofit I 4 Williamsburg Boulevard median watershed retrofit II 5 N Patrick Henry Dr/20th St N watershed retrofit 6 John Marshall Drive/ N. Kensington St. watershed retrofit 7 N Sycamore Street median watershed retrofit 8 11th Street N watershed retrofit 9 S Walter Reed Drive watershed retrofit10 Northside leaf storage watershed retrofit11 Windy Run stream restoration12 Donaldson Run Tributary B stream restorationA Lower Long Branch Flood Risk Reduction ProjectB Sycamore Street & 24th Street NC West Little Pimmit Run Phases I & IID 9th St N btwn N Liberty St & N Livingston StE Woodmont SwaleF Donaldson Run outfall / channel repair-24th Rd N