Attachment_6_-_Item_Specifications_Shepherdstown_to_Dam_4_0001.docx

ITEM SPECIFICATIONS

FOR

THE NATIONAL PARK SERVICE

U.S. DEPARTMENT OF THE INTERIOR

CHESAPEAKE AND OHIO CANAL NATIONAL HISTORICAL PARK

TOWPATH REPAIR AND RESURFACING

SHEPHERDSTOWN MP# 72.80 to BIG SLACKWATER MP# 86.90

BASE BID: Shepherdstown MP# 72.80 TO BIG SLACKWATER MP# 86.90

OPTION 1:

MILE MARKER ROAD MP# 119.00 to MP# 122.60

STATE OF MARYLAND

FORM OF PROPOSAL

CHESAPEAKE AND OHIO CANAL NATIONAL HISTORIC PARK

TOWPATH REPAIR/RESURFACING

BASE BID: Shepherdstown MP# 72.80 to Big Slackwater MP# 86.90 OPTION #1: MP# 118.00 to MP# 122.60

SPECIFICATIONS

ITEM # 001

MOBILIZATION:

This Item consists of the contractors’ mobilization of existing equipment and manpower to satisfactorily complete the bid Items under the Contract. Contractors insurances, bonds, necessary permits and incidental Items are covered under this Item. Installation of temporary bridge structures for crossing waste weirs are included under this Bid Item. Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

Measurement and Payment: Lump Sum

ITEM # 002

RESURFACE EXISTING TRAIL DETAIL #6: (towpath width 8 feet) See sheet #6 of the detail drawings for placement location of this Bid Item Furnish and install AASHTO #10 aggregate wearing surface, 2” depth. Work includes but not limited to grading and leveling existing trail surface and removal of center grass strip, roots and rocks including organic and deleterious material. Salvage excavated material for use as embankment backfill alongside slopes of towpath. Use CR-8 limestone at a 3” depth for entire trail section under the AASHTO # 10 wearing surface for a base coat. Wearing course and base material are to be installed with a mechanical paver. Repair of deep ruts and muddy sections will be in accordance to Bid Item # 005 Sub-base Repair. Placement and compaction of aggregate as detailed, specified, and directed in the field, complete and in place. Positive drainage off the trail is to be established prior to installing the Base Material and AASHTO #10 wearing surface. Finished grade and compaction of the side slopes are part of this bid item. National Park Service will provide access to the project areas as noted in the Instructions to Bidders and detail drawings.

Under this Bid Item one linear foot of towpath resurfaced is estimated at 1 square yard of towpath resurfacing. See typical detail drawing number #6 (sheet#7) of the specifications for this Bid Item. Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

Note: AASHTO #10 wearing course and CR-8 base course are to be installed with standard mechanically driven paver machine.

Measurement and Payment: Square Yards

ITEM # 003

RESURFACE EXISTING TRAIL DETAIL #5 (towpath width 10’) See sheet #6 of the detail drawings for placement location of this Bid Item

Furnish and install AASHTO #10 aggregate wearing surface, 2” depth. Use CR-8 crushed limestone at a 3” depth for this section base material. These materials are to be installed with a mechanical paver. Work includes but not limited to grading and leveling existing trail surface and removal of center grass strip, roots and rocks including organic and deleterious material. Salvage excavated materials for use as embankment backfill alongside slopes of towpath. Excess cut material will be hauled off site by Contractor for this section repair of deep ruts and muddy sections will be in accordance to Bid Item # 005 Sub -base repair. Placement and compaction of aggregate as detailed, specified, and directed in the field complete and in place. Positive drainage off the trail is to be established prior to installing the AASHTO #10 wearing surface. Finished grading and compaction of the side slopes is part of this Bid Item. National Park Service will provide access to the project area as noted in the Instructions to Bidders.

Under this Bid Item one linear foot of towpath resurfaced is estimated at 1.22 square yards of towpath resurfacing. See typical detail drawing number 5 (sheet#6) of the specifications for this bid item. Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

NOTE: AASHTO # 10 wearing course and base to be installed with standard mechanically driven paver machine.

Measurement and Payment: Square Yards

ITEM # 004

RESURFACING EXISTING TRAIL DETAIL #4 (towpath width 8’) See sheet #6 of the detail drawings for placement location of this Bid Item

Furnish and install AASHTO #10 aggregate wearing surface, 3” depth. Work includes but not limited to grading and leveling existing trail surface and removal of center grass strip, roots and rocks including organic and deleterious material. Salvage excavated materials for use as embankment backfill alongside slopes of towpath. Excess cut material will be hauled off site by Contractor for this section. Repair of deep ruts and muddy sections will be in accordance to Bid Item # 005 Sub -base repair. Placement and compaction of aggregate as detailed, specified, and directed in the field complete and in place. Positive drainage off the trail is to be established prior to installing the AASHTO #10 wearing surface. Finished grading and compaction of the side slopes is part of this Bid Item. National Park Service will provide access to the project area as noted in the Instructions to Bidders.

Under this Bid Item one linear foot of towpath resurfaced is estimated at 1 square yards of towpath resurfacing. See typical detail drawing number 4 (sheet#6) of the specifications for this bid item. Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

NOTE: AASHTO # 10 wearing course to be installed with standard mechanically driven paver machine.

Measurement and Payment: Square Yards

ITEM # 005

SUBBASE REPAIR

Furnish and install CR-8 crusher run limestone, at locations to be determined in the field by COR. Work includes but not limited to removal and disposal of unacceptable material, preparation of subgrade, placement and compaction of aggregate as directed in the field, complete and in place. Repairs to be used in areas where subgrade is poor or needs to be raised to allow for positive drainage. Consult Contracting Officer Representative for exact locations of subbase repair. Contact the COR prior to performing this work for exact field locations. 100 ton of material per linear mile of towpath resurfacing is required. This material does not need to be installed with a mechanical paver.

Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

Measurement and Payment: per ton installed

ITEM # 006

MAINTENANCE AND PROTECTION OF TRAFFIC (PEDESTRIAN, EQUESTRIAN AND VEHICULAR)

Provide all labor and equipment required to maintain public access to all affected by the work including but not limited to advance notification of vehicular impact, signage, continuous pedestrian access and public emergency services. Signage to be checked prior to each work day for correct placement.

Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

Measurement and Payment: Lump Sum

ITEM # 007

SEEDING

Description: This Item shall include seeding the disturbed areas that were disturbed during construction. The seed formula along the trail shall be as shown on sheet #3 of the detail drawings for all disturbed soils along the towpath. Seeds are to be lightly raked into the soil.

Mulching of all disturbed access and stockpile areas as well as seeding is required under the direction of the COR.

Construction: Contractor shall supply all material, equipment and manpower for seeding.

Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

Measurement and Payment: Lump Sum

ITEM #008

EROSION AND SEDIMENT CONTROL

This Item consists of providing erosion control measures that consist with Best Management Practice’s around the proposed stockpile area potential run off areas. Included are silt fencing barrier protectors and or straw bales for temporary soil retention. Propose erosion control products shall be approved type by the Maryland Department of Environment. See sheet #4 of the detail drawings for E&S types and installation requirements.

Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

Measurement and Payment per linear foot installed

ITEM #009

RESURFACING EXISTING TRAIL DETAIL #3

Furnish and install AASHTO #10 aggregate wearing surface, 2” depth. Work includes removal of center grass strip. Positive drainage off the trail is to be established prior to installing the AASHTO #10 wearing surface. Finished grading and compaction of the side slopes is part of this Bid Item. National Park Service will provide access to the project area as noted in the Instructions to Bidders.

Under this Bid Item one linear foot of towpath resurfaced is estimated at 1.22square yards of towpath resurfacing. See typical detail drawing number 3 (sheet#7) of the specifications for this bid item. Dollar amounts for this work are to be entered on the appropriate quantities bid sheet.

NOTE: AASHTO # 10 wearing course to be installed with standard mechanically driven paver machine.

Measurement and Payment: Square Yards