DC Water 1st St Tunnel Forum Mtg 2014 04 24
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Transcript of DC Water 1st St Tunnel Forum Mtg 2014 04 24
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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
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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.
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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
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Construction UpdateScott Hoffman, Skanska‐Jay Dee (SKJD)
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(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
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Six‐Week Look‐Ahead and Street ActivityScott Hoffman, Skanska‐Jay Dee (SKJD)
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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
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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)
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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
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Streetscaping at First and V StreetsN
10
Streetscaping in affected area will follow project construction New tree boxes New sidewalks
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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.
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Tunnel Forum Consensus TopicsTom Lindberg, DC Clean Rivers Project
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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.
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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.
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Noise and Vibration Control, and Air QualityScott Hoffman, Skanska-Jay Dee (SKJD)Philip Jo, Kroner Environmental
Gabriel Illingworth, Kroner Environmental
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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
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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
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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.
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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)
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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.
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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.
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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
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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.
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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 — —
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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.
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Predicted Noise Levels atAdams Street-CSA
Mitigations Implemented
Flagler Place NW
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Predicted Noise Levels atV Street-CSA
Mitigations Implemented
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Predicted Noise LevelsThomas Street-CSA
Mitigations Implemented
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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
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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
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TreesJohn Kennedy, DC Clean Rivers ProjectRon Davis, DC Clean Rivers Project
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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
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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
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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)
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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)
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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
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Protection of StructuresStephen Njoloma, DC Clean Rivers Project
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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!
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ParkingKevin Pilong, DC Clean Rivers ProjectStephen Njoloma, DC Clean Rivers Project
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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
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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
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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
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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)
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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
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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
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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
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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