INVITATION TO BID North Bennington Village Culvert Repair · 2019-12-03 · June 13, 2018 at the offices of the Village of North Bennington, for construction of the project hereinafter

INVITATION TO BID North Bennington Village – Culvert Repair

Sealed bids from pre-qualified contractors shall be accepted until 3:00 PM on June 13, 2018 at the offices of the Village of North Bennington, for construction of the project hereinafter described. Bid opening will at the North Bennington Village Offices, Depot Street, North Bennington at 3:30 PM on June 13, 2018. The time of receiving and opening bids may be postponed due to emergencies or unforeseen conditions. Sealed BIDS shall be marked in the lower left hand corner: Bid Documents: North Bennington Village – Culvert Repair. PROJECT LOCATION: Water Street (VT Route 67A), North Bennington, Vermont. TYPE OF CONSTRUCTION: Work to be performed under this project includes: the culvert wall repair, wingwall repair, and the improvement of upstream bed material/slope. In addition, three tree stumps will be removed on the south side of the upstream bank to provide access for the bed material re-structuring. CONTRACT COMPLETION DATE: The Contract shall be completed on or before July 31, 2018.

State of Vermont Agency of Transportation 359 Bowen Road Bennington, VT 05201

[phone] 802-447-2790 [fax] 802-447-2793 [ttd] 800-253-0191

Agency of Transportation

www.aot.state.vt.us

SCOPE OF WORK

The FHWA declared a disaster in the State of Vermont due to a storm occurring on July 30, 2017.

A box culvert in the Village of North Bennington suffered damage as a result of the event. Higher than

normal flowrates and debris caused structural damage of the culvert box wall, as well as wing wall damage.

The repair work for this project includes the culvert wall repair, wingwall repair, and the improvement of

upstream bed material/slope. In addition, three tree stumps will be removed on the south side of the

upstream bank to provide access for the bed material re-structuring. The removal of the tree stumps will

also serve as a safety measure for workers during construction.

BID

Bidders will provide all labor, equipment and materials, including safety measures (working over

water plan, fall protection, etc.), traffic control and materials required to perform the necessary work.

Bidders will provide a lump sum cost for all of the inclusive work described.

Location:

Water Street (Route 67A) MM 3.03, North Bennington, VT 05257.

• Longitude: -73.093247

• Latitude: 43.133096

Description of Work:

Work at this site will include four phases -

• To provide access and provide safety during construction, three tree stumps will be removed

on the south side of the upstream bank.

• The damaged area of the existing box culvert will be repaired.

• A new wing wall and inlet pad will be constructed and attached to the inlet end of the culvert.

• The existing upstream bed will be restructured and stone armored to meet the specifications

of the stream alteration permit issued by the Agency of Natural Resources (ANR).

The sidewalk, curb, road surface and any other areas affected by this construction are to be

restored to their original condition in accordance with VT AOT 2011 standard specifications for

construction. Traffic control plan 6H-10 is recommended during construction. Appendix D

contains the figure and details for traffic control plan 6H-10. Consult the Manual on Uniform

Traffic Control Devices (MUTCD) for further information.

1. Removal of the three tree stumps – to provide access and serve as a preventative safety measure

• Three tree stumps will be removed

• The voids will be filled level with adjacent sidewalk

• The filled area will be seeded/mulched

2. Repair damaged concrete box culvert

• Saw cut pavement and remove the curb/sidewalk over the damaged culvert

• Excavate existing asphalt and subbase material above the damaged section of the box culvert

• Remove weakened concrete to square out the hole and expose uncompromised/solid rebar, tie

new #5 rebar to existing rebar with a minimum overlap of 4”

• Form up the damaged hole and fill with minimum Class C Concrete (3,000psi).

• Backfill box culvert with dense graded crush gravel and compact in lifts no greater than 12”.

• Replace sidewalk and curb to pre-construction conditions

• Rebuild the road surface that was excavated with 5” of Bituminous Concrete Pavement

(BCP), 3” base layer of Type II BCP, followed by a 2” layer of Type III BCP.

3. Remove and replace wing wall at inlet and extend inlet pad

• Remove existing north wing wall at inlet and excavate existing material and place a minimum

6” of dense graded crush gravel subbase prior to forming

• Extend existing concrete base pad to support new wing wall and match existing slab

thickness, pad shall be dowelled and epoxied into existing slab a minimum of 4” using #5

rebar on 6” intervals.

• Form and pour wing wall (6’ long, 4’ high, minimum thickness 8”), using #5 rebar both

ways, 12” on center.

• Using #5 rebar, wing wall shall be dowelled and epoxied into existing concrete box culvert a

minimum of 4” on 6” intervals.

4. Alter stream bed to create a smoother transition while maintaining step-pools

• Remove mounded material currently in stream bed - replace with ANR Type E3 stone in a

section approximately 30’ long, 6’ wide, 3’ max depth

• Re-use excavated material to fill voids between ANR Type E3 stone boulders

• ANR Type E3 stone will be placed to maintain a step-pool system - under the guidance of the

river management engineer

• VTrans Type II stone will be utilized to armor stream banks – 24” thickness, ~2’ from toe to

top of bank

Appendices

A: Drawings and Details. Sheets 1-3

B: Quantities/Specs

C: Site Photos/Maps

D: Traffic Control Plan

Appendix B:

QUANTITIES

Village of North Bennington

D1-VT67A-01

67A (Mile Marker 3.03), North Bennington, Vermont.

DESCRIPTION MATERIAL ITEM # UNIT QUANTITY

Sidewalk Concrete (Class B) 501.34 CY 1

Curb Concrete (Class B) 501.34 CY 0.2

Pavement Bituminous Concrete Pavement 406.25 TONS 4

Road-base Dense-Grade 301.35 CY 7

Culvert Box Wall Concrete (Class A) 501.33 CY 0.5

Wingwall Concrete (Class A) 501.33 CY 0.6

Wingwall Pad Concrete (Class A) 501.33 CY 0.25

Streambank Armor VTrans Type II Stone 613.11 CY 5

Streambed Armor ANR E3 Stone NA CY 15-20

Rebar #5 NA LF 150

Streambed Stone Fill Design Guidance

Type Q50 Velocity (fps)* Embeddedness (in) Suggested Manning’s n (roughness) E1 V ≤ 9 18 0.035 E2 9 < V ≤ 11 24 0.037 E3 11 < V ≤13 36 0.039 E4 13 < V ≤ 15 48 0.041

*Maximum velocity should be based on a minimum 50-year design flow rate (AEP 2% or Q50) and calculated at the structure outlet.

Item xxx.xxx CY Streambed Stone Fill Specification

Type E1. The longest dimension of the stone shall be at least 18 inches, and at least 50 percent of the volume of the stone in place shall have a least dimension of 12 inches, and at least 25 percent of the particles shall have a maximum dimension of 2 inches and be well graded material.




Notes

• The streambed stone fill shall be hard, blasted, angular rock other than serpentine rock containing the fibrous variety chrysotile (asbestos). Similar sized river sediment is an acceptable alternative as is a mixture of angular material and river sediment.

• Stone placed inside of a closed structure shall be placed such that the structure is not damaged. • Care shall be taken to limit segregation of the materials. • Add sand borrow item as needed to seal the bed and prevent subsurface flow. • There shall be no subsurface flow upon final inspection.

Appendix C

Page 652 2009 Edition

Notes for Figure 6H-10—Typical Application 10Lane Closure on a Two-Lane Road Using Flaggers

Option:1. For low-volume situations with short work zones on straight roadways where the flagger is visible to road

users approaching from both directions, a single flagger, positioned to be visible to road users approachingfrom both directions, may be used (see Chapter 6E).

2. The ROAD WORK AHEAD and the END ROAD WORK signs may be omitted for short-durationoperations.

3. Flashing warning lights and/or flags may be used to call attention to the advance warning signs.A BE PREPARED TO STOP sign may be added to the sign series.

Guidance:4. The buffer space should be extended so that the two-way traffic taper is placed before a horizontal

(or crest vertical) curve to provide adequate sight distance for the flagger and a queue of stoppedvehicles.

Standard:5. At night, flagger stations shall be illuminated, except in emergencies.

Guidance:6. When used, the BE PREPARED TO STOP sign should be located between the Flagger sign and the

ONE LANE ROAD sign.7. When a grade crossing exists within or upstream of the transition area and it is anticipated that queues

resulting from the lane closure might extend through the grade crossing, the TTC zone should be extendedso that the transition area precedes the grade crossing.

8. When a grade crossing equipped with active warning devices exists within the activity area, provisionsshould be made for keeping flaggers informed as to the activation status of these warning devices.

9. When a grade crossing exists within the activity area, drivers operating on the left-hand side of thenormal center line should be provided with comparable warning devices as for drivers operating on theright-hand side of the normal center line.

10. Early coordination with the railroad company or light rail transit agency should occur before workstarts.

Option:11. A flagger or a uniformed law enforcement officer may be used at the grade crossing to minimize the

probability that vehicles are stopped within 15 feet of the grade crossing, measured from both sides of theoutside rails.

Sect. 6H.01 December 2009

Appendix D

2009 Edition Page 653

Note: See Tables 6H-2 and 6H-3for the meaning of thesymbols and/or lettercodes used in this figure.

50 to 100 ft

(optional)A

B

C

(optional)

50 to 100 ft

A

B

C

Typical Application 10

Figure 6H-10. Lane Closure on a Two-Lane Road Using Flaggers (TA-10)

December 2009 Sect. 6H.01