11

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

April 24, 2014

Briefing for:

Briefing on:

dcwater_template_art

DC CLEAN RIVERS PROJECTFirst Street Tunnel

Construction Update andFocus on Noise, Vibration,

and Air Monitoring /Controls

First Street Tunnel Forum/Community Group

22

Tunnel ForumRepresentatives and Alternates

Location/Group Representative AlternateFirst Street NW Dr. Marilyn Lashley Tomas EncaracionBryant /Channing Streets Renee Peres TBDFlagler Place Victoria Leonard Pia Brown Adams Street Shelly Parker TBDW Street Joe Levesque TBDFirst and V Streets Angela Ray Theodore BushU Street Serita Sanders John SalattiThomas St /Rhode Island Ave Chris Von Ferro Harvey HartfieldLocal Blogs Scott Roberts Betsy McDanielGovernment-ANC Mark Mueller Teri Janine QuinnCivic Associations Sherry HowardSpecial Interest Groups

All meetings are open to the public.

33

Construction Update Six-Week Look-Ahead

and Street Activity Tunnel Forum Consensus Topics Noise and Vibration Control,

and Air Quality Trees Protection of Structures Parking Next Steps

Presentation Agenda

44

Construction UpdateScott Hoffman, Skanska‐Jay Dee (SKJD)

55

(OPEN MAY 2014)(OPEN MAY 2014)

MAY 2014)

Main mining shaft activities/demo Schedule for freeze trench and

Construction Staging Areas (CSAs)

Rodent control Utility work Site office Instrumentation and monitoring Hotline testing and roll-out Special Needs Survey Noise, vibration, and air

monitoring

Construction Update

66

Six‐Week Look‐Ahead and Street ActivityScott Hoffman, Skanska‐Jay Dee (SKJD)

77

Project Activity Over the Next Six Weeks Install ground freezing utility trench: late April – mid May Establish Construction Staging Areas:

Channing St, late April – mid May: Conduct surveys, perform rodent control applications, prepare site for slurry wall construction

Adams St, mid May: Locate utilities V St: mid May: Locate and relocate utilities

Alternative Parking Areas Bryant St, April – mid May: Removed street light at Bryant and Second Streets, demo sidewalk

along W St, paving and striping, install signs and curbs McMillan, early May: Utility coordination, install perimeter fence, site prep, paving and striping W St, late May: Lot demo and site prep; install temporary lighting, perimeter fencing, curb, and

retaining walls 143 W St, mid May: Relocate and install fence, relocate parking bumpers, install signs

88

Upcoming Street Closures Continued street closure at First and Channing Streets

for: McMillan Stormwater Storage Project (MSSP) SKJD work at the main mining shaft

Starting in mid May, portions of the West Street alley will be closed for construction of the freeze trench at: Channing Street mining shaft West side alley at Bryant Street south to Thomas Street

First and V Streets will be closed for construction (see next two pages for details)

99

Tree Box Removal at First and V Streets to Maintain Two-Way Traffic

Construction Staging Area: Site Prep and Construction

Remove tree boxes on First Street at First and V Streets intersection

Construction Staging Area

N

Pave First Street up to existing sidewalks

To maintain two-way traffic on First Street as required by DDOT

1010

Streetscaping at First and V StreetsN

10

Streetscaping in affected area will follow project construction New tree boxes New sidewalks

1111

Rodent Report: Thomas Street NW Alley

DC Water’s Rodent and Pest Control Program is underway, ahead of construction

We are working with the DC Department of Health in the project area to respond to community concerns about rodents Thomas Street NW alley.

1212

Tunnel Forum Consensus TopicsTom Lindberg, DC Clean Rivers Project

1313

Resident Parking PermitsExtend 2-Hour Parking Restriction

Proposal to extend 2-hour parking restriction was discussed on March 20 at an ANC meeting, and again on March 27 at our Tunnel Forum meeting

Approved by neighbors at March 20 meeting

Need approval from DDOT

If approved, DC Water/SKJD will implement change

McMillan ReservoirN

Extended parking area is shown in the shaded area.

1414

Response to Eliminate No Turn on RedStreet Sign at Bryant and First Streets NW

DC Water and DDOT considered the proposal to eliminate the No Turn on Red sign at the intersection of Bryant and First Streets NW

DDOT determined: There is no confusion between the

existing No Turn on Red sign and the First Street Detour sign

Northbound motorists making a right turn on Bryant St cannot see cars coming from the eastbound direction

The No Turn on Red sign must remain for motorists’ benefit and safety

Existing traffic signs at Bryant and First Streets NW to remain in place.

1515

Noise and Vibration Control, and Air QualityScott Hoffman, Skanska-Jay Dee (SKJD)Philip Jo, Kroner Environmental

Gabriel Illingworth, Kroner Environmental

1616

Addressing Community Concerns About Construction

Construction Noise, Vibration, & Air Quality Issue

Contact Hotline(844) FST-INFO (844-378-4636)

SKJD Notified

Monitor Complaint Response

Evaluation of Work (Existing Conditions)

Evaluation of Issue at the Noise & Vibration Source

Evaluation of Noise & Vibration Controls

Compliance Data Sent to DC Water

Further Mitigation to be Considered

1717

Implemented Noise and Vibration Mitigation Measures

Noise reduction measures Best available control technologies Noise barriers Equipment alternatives Consolidated generators, compressors, and

gas-powered looped freeze trench system Equipment maintenance and inspections

DC Water FST contract requirements Dedicated noise and vibration specialist Detailed monitoring and control plans Restrictions on work hours near sensitive

receptors Limits based on DCMR and DC Water’s

baseline readings Period real-time monitoring DDOT-approved haul routes

Hotline 844-FST-INFO (844-378-4636) Consolidate equipment at Channing

Street CSA TBM support area Freeze plant location Fewer sensitive receptors South and east berms as noise barriers Power generators and compressors sited here Use utility trench to bring power, air, and

freeze to CSAs

1818

Sound Basics Sound vs. noise

Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas

Noise is an unwanted sound; its intensity (“loudness”) is measured in decibels (dB)

How is sound level measured? Sound Pressure Level (SPL) is the force of

sound on a surface area SPL depends on the environment in which

the source is located and the listener’s distance from the source

We “hear” or perceive sound pressure as loudness

SPL is measured in decibels by a sound level meter

Sound Source

Sound pressure level is measured in decibels by a sound level meter.

1919

Sound Basics Typical range of construction

sound at 50 feet Auger: 80–83 dB(A) Concrete mixer: 85 dB(A) Air compressor: 80–83 dB(A) Diesel generator: 80–85 dB(A) Backhoe: 80 dB(A) Excavator: 85 dB(A) Crane: 83 dB(A) Pneumatic tools: 85 dB(A) Jackhammer: 110 dB(A)

2020

Sound Basics Various sound descriptors (not all noise is created equal…)

Instantaneous noise level (Lp):Receiver’s noise at any moment in time; also known as instantaneous sound level

Maximum/minimum noise level (Lmax/Lmin): Highest/lowest instantaneous noise level during a specified time period

Equivalent noise level (Leq):Average acoustical energy over a given period of time

The sound pressure level fluctuates from about 60 dB(A) to almost 80 dB(A).

With every strike of the hammer, the noise level rises rapidly and then falls off equally rapidly.

2121

Sound Basics Noise math

Addition: Adding two equal noise sources results in a 3 dB increase80 + 80 = 160 dBA 80 + 80 = 83 dBA

Subtraction: Subtracting one noise source from two equal noise sources results in a 3 dB decrease80 – 77 = 3 dBA 80 – 77 = 77 dBA

Microphone recording sound data during construction activities.

2222

Vibration Basics What is vibration?

Vibration is an oscillatory motion which can be described in terms of displace-ment, velocity, or acceleration

In most cases, the response of humans, buildings, and equipment to vibration is more accurately and commonly des-cribed using velocity (inches/second)

Expressed in in/sec or VdB Three vibration wave types: P, S, and

R waves R wave (surface wave) is most difficult

to control

P-Wave

S-Wave

R-Wave

2323

Vibration Basics Typical vibration levels of construction equipment at 25 feet

Hydromill: 0.017 in/sec Vibratory roller: 0.21 in/sec Dozer: 0.089 in/sec Auger: 0.09–0.1 in/sec Truck: 0.08 in/sec Crane: 0.1 in/sec Jackhammer: 0.035 in/sec

Sand filter demolition at McMillan site.

2424

Project Construction Noise Limits

Source:1) DC Municipal Regulations – 2802, Construction2) EDR noise limit accounts for 3 dBA + ambient

Noise Limits (25 ft from the outermost limits of the construction site).Construction Staging Area

Location

Weekday LeqLimits (dBA)

7:00 AM – 7:00 PM

Weekend LeqLimits (dBA)

7:00 AM – 7:00 PM

Nighttime LeqLimits (dBA)

7:00 PM – 7:00 AM

Channing St (CS-CSA) 801 622 612

Adams St (AS-CSA) 801 — —

V St (VS-CSA) 801 — —Pump Station (PS-CSA) (on Thomas St) 801 — —

2525

Site-Specific Noise and VibrationMitigation Measures

Site Mitigation Measures

CS-CSA• Existing berm will remain• Additional sound barrier 6 feet above berm• Consideration of construction methods

AS-CSA, VS-CSA, PS-CSA

• Portable sound barriers for specific equipment on-site• 1 drill rig in operation at a time• 1 loader operating in support of drilling• Limited choice of heavy equipment during drill rig operations• 2 cranes used during operations; additional heavy equipment

use prohibited• Limited work hours

Freeze Trench, APAs, CWZ

• Case-by-case basis• Limited heavy equipment use• Use monitoring to determine extent of noise and vibration• Limited work hours

Sample of noise-reduction panel.

2626

Predicted Noise Levels atAdams Street-CSA

Mitigations Implemented

Flagler Place NW

2727

Predicted Noise Levels atV Street-CSA

Mitigations Implemented

2828

Predicted Noise LevelsThomas Street-CSA

Mitigations Implemented

2929

Air Monitoring Dust suppression required on-site Based on erosion and sediment plan,

no visible dust to leave site Real-time dust monitoring Periodic monitoring especially during

heavy earth-moving Real-time monitoring upwind and downwind

3030

Addressing Community Concerns About Construction

Construction Noise, Vibration, & Air Quality Issue

Contact Hotline(844) FST-INFO (844-378-4636)

SKJD Notified

Monitor Complaint Response

Evaluation of Work (Existing Conditions)

Evaluation of Issue at the Noise & Vibration Source

Evaluation of Noise & Vibration Controls

Compliance Data Sent to DC Water

Further Mitigation to be Considered

3131

TreesJohn Kennedy, DC Clean Rivers ProjectRon Davis, DC Clean Rivers Project

3232

Tree Removal and Replanting 65 trees of varying diameter were removed in

February 2014 in the Bloomingdale area 11 at McMillan APA 4 at W Street APA 9 at Bryant Street APA

DC Water and SKJD will work with DDOT and the Tunnel Forum Group prior to re-constructing each disturbed area

Potential collaboration between DC Water and DDOT to plant trees in public right-of-way in the Bloomingdale area during construction

DC Water’s tree giveaway program can provide small trees to neighborhood residents

4 at Channing Street CSA 16 at Adams Street CSA 15 at First and V Streets CSA 6 on Thomas Street

65 trees of varying diameter were removed from the Bloomingdale neighborhood earlier this year.

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New Tree

Existing Tree

Flag

ler P

l NW

Adams St NW

TREES• ACNI – Black Maple• ACRU – Red Maple• ACSA – Sugar Maple• MAVI – Sweetbay Magnolia• PLHY – London Planetree• QUPH – Willow OakSHRUBS• AZGP – Pink Azalea• GAJA – Dwarf GardeniaGRASSES• LIMJ – Big Blue Lilyturf

New Planter Box

Landscaping Planting PlanAdams and Flagler Streets

3434

New Tree

Adams St NW

Firs

t St N

W

TREES• ACNI – Black Maple• ACRU – Red Maple• ACSA – Sugar Maple• MAVI – Sweetbay Magnolia• PLHY – London Planetree• QUPH – Willow OakSHRUBS• AZGP – Pink Azalea• GAJA – Dwarf GardeniaGRASSES• LIMJ – Big Blue Lilyturf New Planter Box

Landscaping Planting PlanAdams and First Streets

3535

V St NW

New Tree

Existing Tree

TREES• ACSA – Sugar Maple• PLHY – London PlanetreeSHRUBS• AZGP – Pink Azalea• GAJA – Dwarf Gardenia

New Planter Box

Firs

t St N

W

Grass – Lirope Muscari “Big Blue”

Landscaping Planting PlanFirst and V Streets (Sheet 1)

3636

New Tree

Existing Tree

TREES• ACNI – Black Maple• ACRU – Red Maple• ACSA – Sugar Maple• LAIN – Crape Myrte• PLHY – London PlanetreeSHRUBS• AZGW – White Gumpo Azalea• GAJA – Dwarf Gardenia• HOPA – Patriot Hosta• HYQU – Oak Leaf HydrangeaGRASSES• HEMI – Purple Palace

Coral Bells• IRVE – Blueflag Iris• SEAJ – Autumn Joy

StonecropNew Planter Box

Grass – Kentucky Bluegrass, Fescue, Red TopGrass – Lirope Muscari “Big Blue”

V St NW

Firs

t St N

W

Landscaping Planting PlanFirst and V Streets (Sheet 2)

3737

New Tree

Existing Tree

TREES• CABE – European Hornbeam• GIBI – Ginkgo “Princeton Sentry”

(fruitless male version)• LIST – Gum• PICH – Chinese PistacheGRASSES• LIMJ – Big Blue Lilyturf

New Planter Box

Firs

t St N

W

Thomas St NW

Landscaping PlanThomas Street

3838

Protection of StructuresStephen Njoloma, DC Clean Rivers Project

3939

Offer for Free Survey Ends Thursday, May 1, 2014

Structures shown in green are eligible to receive a free pre-construction survey

Surveys, video, and photos provide a snapshot of structure condition prior to construction

A survey is voluntary, but you must participate to receive documentation

Risk of potential damage to property is very slight, but possible

Having a survey may strengthen a property owner’s claim of damage caused by construction

Hurry! Time is running out to get your free survey!

4040

ParkingKevin Pilong, DC Clean Rivers ProjectStephen Njoloma, DC Clean Rivers Project

4141

Parking Summary and Update Extend 2-hour parking restrictions in

neighborhood First DC Water project to provide Alternative

Parking Areas (APAs) Implement APAs – Summer 2014 Continually monitor APA operations and

improve as necessary

4242

Resident Parking PermitsExisting Residential Parking Areas – Zones 1 & 5

Posted Zone 5 Parking Only Area is shaded in blue ( )

Posted Zone 1 Parking Only Area is shown in orange ( )

Existing Shared Zone 1 and 5 Parking Area is shaded in green ( )

McMillan ReservoirN

Metered parking on

the north side of W St

4343

Resident Parking PermitsProposed Residential Parking Areas – Zones 1 & 5

Posted Zone 5 Parking Only Areais shaded in blue ( )

Posted Zone 1 Parking Only Area is shown in orange ( )

Existing Shared Zone 1 and 5 Park-ing Area is shaded in green ( )

Proposed Zone 5 Parking Only Area is shaded in pink ( ) to better accommodate those who are directly impacted by construction

Steps for revising parking zone signs ANC support DDOT approval DC Water/SKJD to implement changes

McMillan ReservoirN

Metered parking on

the north side of W St

4444

Alternative Parking AreasLocation Map

143W-APA (21)

Alternative Parking Areas for eligible residents are shown as Bryant St (BS-APA) – 56 spaces W St (WS-APA) – 21 spaces 143 W St (143W-APA) – 21 spaces For a total of 98 alternative parking

spaces

Construction Staging Areas are shown as ; these areas are closed to the public

Contractor /private parking areas are shown as

BS-APA (56)

W St NW

V St NW

U St NW

Adams St NW

V St NW

Elm St NW

2ndSt

NW

W St NW

Thomas St NW

Old Maple St NW

McMillan Reservoir Entrance

Channing St NW

Bryant St NW

Rhode Island Ave

Bryant St NW

Flagle

r St N

W

First

St N

W

First

St N

W

N

WS-APA (21)

4545

Alternative Parking AreasWho is Eligible to Park at an APA?

To get an APA tag number you need: Current DC registration Zone 5 Residential Parking

Permit Reside between North Capitol

and 2nd Streets NW and Channing and Thomas Streets NW; shown in pink on the map

Each resident is assigned a specific APA tag number

APA information package is being prepared for mailing

McMillan ReservoirN

Alternative Parking Areas for eligible residents are shown as

4646

APA Priority Areas

Priority Area 1 ( ) – assign parking to those directly fronting construction and without available off-street parking

Priority Area 2 ( ) – roll out APA tags to this area first, monitor, and expand if necessary

Priority Area 3 ( ) Fourth priority – issue guest

passes; this phase will be revisited following delivery of parking passes for Priorities 1 through 3

McMillan Reservoir

N

4747

DCCR traffic and permit staff have investigated this suggestion Loss of parking due to construc-

tion activities should be mitigated with APA implementation

Recommendation: Continue alternate side of street

parking with DPW street sweeping at this time (streets shown as )

Revisit the issue after APAs are implemented

From March 27 Tunnel Forum MeetingStreet Cleaning: Continue or Suspend?

McMillan Reservoir

N

4848

Next Steps DC Water and SKJD to coordinate with DDOT regarding 2-hour

parking extension signage Possible new hours for our meetings: suggest changing from

6:30–8 PM to 7–8:30 PM to better accommodate your schedule Schedule next Tunnel Forum Meeting –

Thursday, May 22 or Thursday, May 29(Memorial Day is Monday, May 26.)

Topics: APA roll-out Status of Construction Staging Areas Suggested topics