Slayton Hill Road Reconstruction Presentation

transcript

Slayton Hill Road Reconstruction

Lebanon, NH

February 12, 2014

Slayton Hill Road ReconstructionCity of Lebanon, NH

Welcome and Introductions

• Greg Lewis – City Manager

� Ground Rules

• Paula Maville – Deputy City Manager

� Scenic Road Designation

• David McNamara – Fay, Spofford, & Thorndike

� Design Update

Scenic Road Designation

• Declaration of Purpose:

• Slayton Hill Designated Scenic on 12/15/93

• Impacts to Right-of-Way

� 88% of stone walls between Dulac & 78 Slayton

� An additional 44% between 78 Slayton &

Dunsinaine

� 60% of trees (total length of project) will need to

be cleared

Scenic Road Designation

• One of Two Processes to Undertake

� §134-5 Effect of Designation as Scenic Road

� Manager to obtain written consent of the Planning

Board after a Public Hearing

� §134-8 Rescission of Designation of Scenic Road

� Requires a petition of 10 Persons who are either voters

of the City or who own land which abuts the road

� Reports Solicited from the Planning Board and

Conservation Commission

� Public Hearing held by the City Council

Meeting Objectives

• Update on status of project� Temporary repairs

� Complete

� Permanent reconstruction� Design Progress

� Next Steps

• Solicit feedback� Scenic Road Designation

� Present updated design progress

� Discuss potential property and edge of road impacts due to permanent improvements

Existing Conditions

• Slayton Hill Road was built into a hillside

• Ledge and poorly drained soils

• Slayton Hill Road – Reconstructed in 2001/2002 timeframe

• Design was restricted by Scenic Road designation and limiting property impacts

• Culverts generally replaced with new ADS pipe of the same size

• Narrow/shallow swales and underdrains with limited armor in place along uphill side of road

• New Standards � Precipitation Data

� Storm Sizing

Response – Short Term Repairs

• City forces

� Immediate repairs following July 2nd Storm (July)

� Temporary water main

� Roadway repairs to allow traffic

� Intermediate Term (Complete)

� Repair buried water main

� Widen road to allow minimum two lanes of traffic

� Temporary pavement course for winter maintenance

� Armor washed out ditches

� Additional culvert to divert flows in lower section

Design

• Design Storm

� 100 year minimum

• Culvert sizing

� Slayton Hill Road

� Total of 22 cross culverts

– 10 are adequately sized

– 11 are undersized

– 1 new Culvert

� Dulac Street

� Total of 3 cross culverts

– 2 are undersized

– 1 new culvert (twin pipes)

Culvert Sizing – Slayton Hill Road

AREA STATION EXISTING CULVERT SIZE PROPOSED CULVERT SIZE

1 Intersection w/ Dulac St 18” HDPE 24” RCP

2A 7+99 18” HDPE 24” RCP

2B 11+84 ----- 24” RCP

3 12+43 2.7-Ft x 2.6-Ft Concrete Box 4-Ft x 4-Ft Concrete Box

4 16+00 18” HDPE / 27.6 24” RCP

5 19+59 15” HDPE 15” RCP

6 20+85 15” HDPE 18” RCP

8 27+98 24” HDPE 24” RCP

9 29+38 18” HDPE 18” RCP

Replace CB with Headwall

10 33+82 30” HDPE 30” RCP

11 42+31 24” HDPE Twin 24” RCPs

12 56+21 18” HDPE 24” RCP

13 56+89 24” HDPE 24” RCP

14 61+11 18” HDPE 30” RCP

15 63+11 18” HDPE 24” RCP

16 66+52 24” HDPE 36” RCP

17 75+26 48” HDPE 6-ft x 4-ft Concrete Box

18 82+53 18” HDPE18” RCP

19 85+99 18” HDPE18” RCP

20 30” HDPE 30” RCP

21 3+72 15” HDPE 15” RCP

22 89+18 15” HDPE 15” RCP

Culvert Sizing – Dulac Street

23A 202+50 12” HDPE Twin 18” RCPs

23C 206+50 ----- Twin 18” RCPs

23B 209+50 12” HDPE 24” RCP

Design

• Ditches� Most proposed are V shaped,

1.5’ to 2.0’ deep, 3:1 sideslopes off the road, 2:1 back slopes to match existing ground

� Lower portion includes a 2’ wide flat bottom

� Slopes steeper than 10% will be stone lined

� Slopes flatter than 10% will be grass, with reinforced matting products

� Underdrains

Design - Tributary Drainage Areas

Slayton Hill Road Typical Section

Slayton Hill Road – Sta. 0+00 to 21+50

(Dulac to #53)

Retaining Wall #1

(#53 to #121)

Profile Change

(#121 to #141)

(#141 to #183)

RetainingWall #3

Slayton Hill Road – Sta. 86+00 to

Dunsinane (#183 to Dunsinane)

Dulac Street

Dulac Street Typical Section

Next Steps

• Continue Design� Meet individually with abutters

� Incorporate public comment

• Permitting� Coordination with relevant Local, State and Federal agencies

� Dredge and Fill Permit, Shoreland Protection, Alteration of Terrain

� Scenic Road Designation

• Final Design� Develop plans for bidding

� Contract book and specifications

• Advertise� Accept Contractor bids

• Construction

Individual Meetings

• Purpose� Discuss direct impacts to individual properties

� Present ROW or easement acquisition offers

• Times� 12 PM to 8 PM windows

� Monday, March 3

� Wednesday, March 5

� Monday, March 10

� Wednesday, March 12

� 20 minutes each

� Sign up tonight with Tina

ROW Process

• Follow NHDOT LPA/Federal Guidelines

• Permanent Impacts� Maintenance for drainage

� Retaining walls

• Temporary Impacts� Slope and clearing work

� Arborist

� Driveway tie-ins

• City to assess property values

• Compensation offer� Monetary compensation

Construction

• Duration

� Major construction activities - one season, May to

November

� Final overlay, clean up work – Spring of 2015

• Traffic Management

� Full Access to houses, emergency vehicles at all times

� Road closures allowable July and August

� Minimum one-lane open during school year (7 AM to 9

AM and 3 PM to 5 PM)

Timeline – Full Reconstruction

• Meet with Public, Walk-about, discuss impacts� September/October

• Final design� February - April

• Permitting� February - April

• Bid Project� May

• Construction� May - November 2014

Individual Group Break Out

• Follow Up Questions� http://ask.lebnh.net/

• Contact Information� Greg Lewis, City Manager

� greg.lewis@lebcity.com

� Phone: 603-448-4220

� Mike Lavalla, Director of Public Works� Mike.lavalla@lebcity.com

� Phone: 603-448-3112

� David McNamara, FST Project Manager� dmcnamara@fstinc.com

� Phone: 603-669-2000

Slayton Hill Road Reconstruction Presentation

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