A04_MIMA_Scope_of_Work.pdf

SCOPE OF WORK

November 28, 2022

REHABILITATE STEDMAN BUTTRICK HOUSE GARDEN TERRACES:

Railing & Gate Repair & Fabrication Services and Walkway & Step Stabilization for

Minute Man National Historical Park, Buttrick Garden Terraces Area

With Option A: Hazardous Tree & Limb Removal & Pruning

PMIS 256974A & 314078A/PEPC 104430

PROJECT DESCRIPTION:

Extreme weather conditions have caused decay, deterioration, and damage to landscape features within the Minute Man National Historical Park (MIMA), Buttrick Garden Terrace area. Decay has been caused by carpenter ant and termite activity in mature trees. Deterioration has occurred to bluestone and cobble walkways and steps within the terrace area. Damage has been caused by vandalism and weathering of iron railings and gates within the historic garden area. The park requires services of iron railing and gate repairs and targeted walkway and step stabilization within the park located in Concord, Massachusetts. The park also seeks an Option for hazardous tree removal and pruning. This work will ensure the preservation of historic elements and safety of park visitors and staff.

Services shall include, but are not limited to, the furnishing of all materials, labor, equipment, tools, transportation, superintendence, qualified Arborists, and metal craftspeople to complete work described herein, with an optional bid on the tree work.

The MIMA Contracting Officer’s Representative (COR) will be responsible for determining a site work schedule that will not impair cultural, natural, and archeological resources. The specifications of the contract are described in seven parts plus Attachments A and B:

1. General Specifications (including Bidding Format and Evaluation Criteria)

2. Ironwork and Painting

3. Masonry

4. Tree Work

5. Contracting Officer and Contracting Officer’s Representative

6. Park Contact

7. Location and Illustrations

Attachment A: List of Tasks Attachment B: Option Tasks

PART 1: GENERAL SPECIFICATIONS (Including Bidding Format)

1.1 SITE CONDITIONS

A. Communication: Contractor shall attend an on-site meeting with the MIMA COR, after award but prior to the commencement of work.

B. Working Hours: Work shall be conducted during regular scheduled working hours. (7:00a.m. – 5:00 p.m. Mon – Fri). No work shall be performed on Federal holidays without prior written approval of the Contracting Officer.

C. Public Access: The Buttrick Garden Terraces are part of Minute Man National Historical Park and are open to the public. The Contractor shall ensure the security and safety of the worksite, including the safety of park visitors, pedestrians, and bystanders. The Contractor will ensure all drop zones are marked with safety cones and/or caution tape, and that all public walkways within the work zone are blocked.

1.2 JOB CONDITIONS

A. Preservation of existing work: Contractor shall preserve, protect, and prevent damage of existing structures, exhibits, utilities, and landscape features. Where damage occurs, contractor shall repair or replace damaged features without cost to the Government.

B. Permits: Contractor is responsible for obtaining all permits required by authorities having jurisdiction. If the Contractor uses equipment that extends above the tree canopy, the Contractor shall obtain permits from Federal Aviation Administration (FAA) due to the nearby airport.

C. Storage Areas: Storage shall be confined to areas proposed by the Contractor and approved by the COR. Storage areas shall be left clean after completion of work and all areas restored to their conditions at commencement of work to approval of the COR.

D. Waste: Contractor will be responsible for removal of waste and trash associated with the project.

As further specified under iron work, no iron work shall be removed without the consent of the COR. As further specified under masonry work, no stones, bricks, or pavers shall be removed without consent of the COR.

E. Parking: Work related vehicles may be parked in areas designated by the COR at the pre-construction conference.

F. Weather: The job site shall not be accessed during severe weather conditions including temperatures below 32 degrees Fahrenheit, lightning storms, high winds with gusts above 50 mph, heavy rain, sleet, or other conditions that are classified as a severe weather advisory.

1.3 SAFETY AND CERTIFICATIONS

A. All work shall conform with Department of Labor, Occupational Safety and Health Administration (OSHA) Regulations, ANSI Z133, and Arborist Industry Safe Work Practices (for tree work).

B. Each workday, the Contractor will communicate with the MIMA COR when onsite and ready to commence work.

C. While tree work is being carried out, a Certified Arborist with current certification shall always be on site during work effort and shall direct all work. All work near electrical lines will be performed by a certified electrical line clearing Arborist with OSHA 10 certification.

D. Barricades: Safety barricades shall be safely erected and used to protect workers, park visitors, and park resources. All ladders shall be removed during Contractor non-work hours. Work areas shall be blocked off during non-work hours.

E. Accident Reports: Accidents shall be reported immediately to the MIMA COR.

1.4 EXISTING UTILITIES

A. Contractor shall be responsible for protecting all known utilities. If damage occurs, the Contractor shall repair the utility with no additional expense to the Government. The Contractor will notify Digsafe before excavating and communicate with the MIMA COR before any excavation.

1.5 SUBMITTALS:

Within ten (10) days of award, Contractor shall provide the following:

A. Safety and Accident Prevention Plan

1.6 SCHEDULE

A. Initiate Project: The Contractor must respond within ten (10) days of being notified of favorable conditions and commence work. Favorable conditions will include, but not limited to dry weather, and when disturbing natural processes is not a factor. The Contractor will be notified by phone with follow up correspondence confirming favorable conditions.

B. Construction Schedule: The Contractor shall execute work according to a Construction Schedule prepared by the Contractor and submitted for review and approval by the Contracting Officer. The purpose of the Schedule is to facilitate ongoing management of the project, thorough inspection of work, and assignment of values for progress payments.

C. Submittals: The Contractor shall submit the Construction Schedule within ten (10) days of Notice to Proceed.

D. Schedule Changes: The progress of work will be monitored according to the approved schedule.

The Contractor shall anticipate required changes and submit all changes for review to the Contracting Officer.

E. Schedule Format and Content: The schedule shall include submittal dates, work dates, delivery dates, dates for beginning and ending of repair activities. The schedule shall include closure dates for work areas and anticipated reopening dates.

1.7 PROJECT PERFORMANCE PERIOD

A. Work shall be completed within two hundred (200) days from Notice to Proceed.

1.8 EXECUTION

A. Temporary Facilities:

Electricity: Provided at the site at designated outlets.

Water: Provided at the site at designated area.

Telephone: Not available at the site.

Toilet: Available at site seasonally. Contractor may choose to be responsible for portable toilet, to be located as directed by NPS. The North Bridge Visitor Center does not currently have a mask covering mandate to enter the building, but a requirement could be reinstated.

B. Storage: Outdoor storage area will be designated by the COR near the work site, which is to be kept neat and orderly throughout duration of the project.

C. Contractor’s Sign: None permitted other than safety related signs.

1.9 COMPLETION AND FINAL INSPECTION

A. Cleaning and Restoration: At the time of final inspection, project area shall be thoroughly clean and areas other than project area shall be in same condition as at commencement of work.

B. Completion and Final Inspection: Contractor shall submit to Contracting Officer written certification that work or designated portion of work is substantially complete and request, in writing, a final inspection. COR will inspect work within ten calendar days of receipt of request.

1.10 PRICING SCHEUDLE

A. Open House: Prior to the bid deadline, the Park will host an open house to show bidders the project area, as detailed in 1.11.C

B. The following bid items shall include all services, materials, labor, equipment, tools, transportation, superintendence, arborists, and craftspeople necessary to execute the work described in the respective Specification Sections. Bid quantities are generally described in the Specifications Sections.

CONTRACT

LINE ITEM

NUMBER (CLIN)

CONTRACT LINE ITEM

DESCRIPTION

QUANTITY

UNIT OF

MEASURE

UNIT

PRICE

TOTAL

PRICE

BASE – Division 1:

Ironwork and Painting Ironwork

Lump Sum

0002 BASE – Division 2:

Masonry

TOTAL BASE PRICE (Contract Line Item Numbers 0001 through 0002) - - - - - - - - - - - - -

OPTION 01: Division 3:

Tree Work

TOTAL PRICE FOR ALL OPTIONS (Contract Line Item Number 0003) - - - - - - - - - - - - - -

TOTAL PROPOSED PRICE - BASE PLUS ALL OPTIONS (Contract Line Item Numbers 0001 through 0003)

C. Description of Bid Items: In the contract bid, the bidding contractor will provide lump sum bids for each division of service: (1) Ironwork/Painting Ironwork, (2) Masonry, and (3) Option 1: Tree Work.

CLIN 0001 - Division 1: Ironwork and Painting Ironwork– Furnish Lump Sum Bid for all work of this Division.

CLIN 0002 - Division 2: Masonry – Furnish Lump Sum Bid for all work of this Division.

CLIN 0003 - Option 1: Tree work – Furnish Lump Sum Bid for all work of this Division including pruning, removals, and stump grinding.

1.11 SUMMARY OF THE WORK

A. Description: The goal of this project is to rehabilitate selected portions of the Buttrick Garden Terraces landscape features at Minute Man National Historical Park North Bridge Unit, according to the specifications and drawings herein.

The work is generally divided into three areas:

Division 1 - Repair the rusted, broken, damaged, and vandalized iron work in the garden, including the repair/placement hand rails at three locations in the garden.

Division 2 - Repair and resetting of the bluestone walkway, brick walkway edge, and associated steps in one location of the garden and resetting of granite sets (small cobblestones) in a nearby location.

Option 1 - Prune and remove hazardous trees and limbs of trees as well as remove weed trees that are causing structural damage to the garden walls.

B. Location: The Buttrick Terrace Gardens are within the North Bridge Unit, which is adjacent to the North Bridge Visitor Center (a.k.a. Buttrick House), located at 174 Liberty Street, Concord, MA, and is administered by the National Park Service, Minute Man National Historical Park, 174 Liberty Street, Concord, MA 01742.

C. Project Walk Through for Bidding: Contractors are expected to visit the Project Site prior to bidding and to be thoroughly familiar with the conditions of the work. The site may be inspected informally daily between 9:00 a.m. and 5:00 p.m. A walk through with the COR will be on December 7, 2022, from 1:00 pm to 3:00 pm. Phone 617 620 2942.

D. Historic Nature of the Work Site: The Contractor shall note the historical significance of the site upon which the work will be performed. The garden and the entire park landscape is listed in the National Register of Historic Places. Because of the historic nature of this site, certain aspects of the work in this Contract will not be carried out with materials and methods commonplace in the modern construction industry. It shall be incumbent upon the Contractor to furnish arborists and/or craftspeople who can execute first class workmanship in the materials and methods specified, and who take any serious precautions to protect elements of this historic site not scheduled to receive work.

E. Layout of the work: Locations and dimensions indicated in the drawings are for reference only.

The Contractor shall immediately notify the Contracting Officer of apparent errors discovered on the drawings or in the initial layout. If changes are required, the Contractor shall cooperate with the Contracting Officer in the prompt establishment of the field control for the altered or adjusted work.

F. All work improperly located due to the Contractor’s errors or omissions shall be corrected by him/her at no additional expense to the Government.

G. Preconstruction Conference: Prior to start of work, the COR will arrange an on-site meeting with the Contractor to discuss the work in general including: project superintendence and administration, National Park Service policy and safety regulations, safety and accident prevention, project schedule, questions about the work scope, specifications, and staging areas, and any points that need to be resolved before the work commences.

H. Coordination: The Contractor shall coordinate the work of the various trades to expedite the project with the minimum amount of disturbance to the National Park Service operations conducted on the premises.

I. Reference Standards: The Specifications list standards, specifications, codes, etc. which govern the quality of materials and workmanship required.

J. Proprietary Reference: Wherever in the drawings or specifications any item of equipment or material is designated by reference to a particular brand name, manufacturer, or trade name, it shall be understood that this is to establish a standard of quality; and it is not intended to exclude manufacturers of similar products believed by the Contractor to be equal to the item specified. The Contractor will be required to demonstrate to the satisfaction of the Contracting Officer that the equipment or material are equal to those designated before any substitutions may be made.

K. Subcontractors: Any subcontractors the primary Contractor plans to utilize must have prior approval by the Contracting Officer and adhere to submittals indicated in Parts 2, 3, and 4 (Option 1).

END OF SECTION

PART 2: IRONWORK AND PAINTING IRONWORK

2.1 SITE ACCESS:

A. Equipment Access: Due to the site limitations for equipment access, work will require a preconstruction conference, communication, and coordination as outlined in Part 1. The Contractor shall route all equipment through existing drives, or as directed by the Park. Vehicular access is possible to the upper level and designated access to the intermediate and lower garden terraces will be indicated by the park’s COR.

2.2 WORKMANSHIP

A. Use skilled and experienced personnel, carefully supervised, in such a manner as to achieve high quality ironwork to match areas in good condition. All workmen shall have sufficient experience to qualify them as experts in ironwork.

B. Control of Corrosion: All work shall prevent galvanic action and other forms of corrosion by insulating metals and other materials from direct contact with incompatible materials.

2.3 COORDINATION

A. Coordinate the work of this part of the contract with that of other pars to ensure proper sequencing and safety of the trades and avoid damage to other work.

2.4 IRONWORK REPAIRS:

A. Description: The distinctive iron work in the Buttrick Garden Terraces dates to the 1920s, 30s, and 40s and contributes to its significance and listing in the National Register of Historic Places. Many of the metal posts, rails, and ornamental scrolls are corroded, broken, or loose. Some components have been removed by vandals. Work includes repairing/removing rust, powder coating of ironwork, and securing iron panels, gate, and railings. Ironwork components are dimensioned and pictured in Attachment A.

Clean all corrosion from metal elements.

Treat ornamental ironwork components with corrosion inhibiting powder coating, kiln baked for outdoor durability.

Clean out receiving holes in masonry

Install hydraulic cement in stone holes to receive metal posts.

B. Iron work removed for sandblasting and powder coating shall be reinstalled with fasteners similar in character to existing fasteners, secured to brick/bluestone pillars, and capable of supporting at least 300 lbs.

C. Stone faces shall not have excessive residual hydraulic cement on the surface.

D. Replace missing components: Repair and re-attach set of gates that are in storage at the park (see Attachment A, Part 2, R-2)

E. Fabricate missing panel (Attachment A, Part 2, R-10). A shop drawing or specification sheet for this replacement panel should be submitted in the contractor/contractors’ proposal (96” length x 34” height to match panel depicted in R-9.

F. Match existing railing (see Attachment A, Part 3, W-5): A shop drawing or specification sheet should be submitted in contractor/contractors’ proposal for the step railing materials to verify that it matches the railings depicted in Attachment A, Part 2, R-4.

2.5 METAL

A. Match existing in composition

B. Brackets, Flanges, and Anchors: Match existing to assure that railings anchor into existing stone and masonry.

2.6 FASTENERS

A. Fasteners for Anchoring Handrails and Railings to Other Construction: Select fasteners of type, grade, and class required to produce connections suitable for anchoring handrails and railing to other types of construction –to be approved by COR.

B. For handrails, railings, and fittings, use plated fasteners complying with ASTM B 633, Class Fe/Zn 25 for electrodeposited zinc coating or equivalent to be approved by COR.

C. Fasteners for Interconnecting Handrail and Railing Components Use fasteners fabricated from same basic metal as fastened metal, unless otherwise indicated. Do not use metals that are corrosive or incompatible with materials joined.

2.7 RUST/CORROSION REMOVAL

A. Sandblasting: Corrosion maybe scraped, or sand blasted from ironwork railings and gates. If removed for sandblasting, each railing and gate piece shall be recorded on a Government Property Receipt and the proposed location of sandblasting submitted to the Contracting Officer for approval before removal. Railing and Gate Pieces shall stored in a secured and locked facility.

Railing and Gate Pieces shall not be transported by another party. Railing and Gate Pieces shall not be transported beyond a fifty-mile (50) radius of the project site. Railing and Gate Pieces shall be returned within 120 days.

2.8 PRIMER, PAINT, POWDER COATING

A. Hot dipped color-galvanized finish or powder coating by kiln baked process for durability are acceptable coating methods, with 20 year durability. If removed for painting or powder coating, each railing and gate piece shall be recorded on a Government Property Receipt and the proposed location of painting or powder coating submitted to the Contracting Officer for approval before removal. Railing and Gate Pieces shall be stored in a secured and locked facility. Railing and Gate Pieces shall not be transported by another party. Railing and Gate Pieces shall not be transported beyond a fifty-mile (50) radius of the project site. Railing and Gate Pieces shall be returned within 120 days.

B. Shop Primer for ferrous metal: Fast-curing, lead- and chromate-free, universal modified-alkyd primer complying with performance requirements in FS TT-P-664; selected for good resistance to atmospheric corrosion, compatibility with finish paint systems indicated, and capability to provide a sound foundation for top-coat paint.

2.9 FABRICATION

A. If removed for welding repairs, each railing and gate piece shall be recorded on a Government Property Receipt and the proposed location of sandblasting submitted to the Contracting Officer for approval before removal. Railing and Gate Pieces shall be stored in a secured and locked facility. Railing and Gate Pieces shall not be transported by another party. Railing and Gate Pieces shall not be transported beyond a fifty-mile (50) radius of the project site. Railing and Gate Pieces shall be returned within 120 days.

B. Welded connections: Repair handrails, railing, and gates by welding. Cope components to provide close fit. At exposed connections, finish exposed surfaces smooth and blended so no roughness shows after finishing and welded surface matches contours of adjoining surfaces.

C. Brackets, flanges, fittings, and anchors: Match existing.

D. Posts: For railing posts set in stone, provide water-tight anchoring material such as hydraulic cement to prevent ingress of moisture in post holes.

E. Fabricate joints that will be exposed to weather in a watertight manner.

2.10 FINISHES GENERAL

A. Prepare, pretreat, and apply coating to exposed metal surfaces to comply with coating and manufacturer’s written instructions. Finish shall include powder coat where feasible, and where infeasible, one coat of inhibitive primer and two cover coats.

B. Color and Gloss: Black satin to match existing and as approved by COR.

2.11 STEEL AND IRON FINISHES

A. For galvanized handrails and railings, provide galvanized fittings, brackets, fasteners, sleeves, and other ferrous components.

B. For ungalvanized steel handrails and railings, provide ungalvanized fittings, brackets, fasteners, sleeves, and other ferrous components.

2.12 IRONWORK CONNECTIONS

A. Welded Connections: Use fully welded joints for permanently connecting railing and gate components. Comply with requirements for welded connections and perform welding in a shop or in the field. Follow requirements listed above if historic components are repaired in a shop.

2.13 TOUCH-UP PAINTING

A. Touch-up painting Immediately after installation, clean welds, bolted connections, and minor abraded areas of powder coating, and paint exposed areas with similar coating material.

3 PART 3: MASONRY REPAIRS

3.1 SITE ACCESS:

A. Equipment Access: Due to the site limitations for equipment access, work will require a preconstruction conference, communication, and coordination as outlined in Part 1. The Contractor shall route all equipment through existing drives, or as directed by the Park. Vehicular access is possible to the upper level and designated access to the intermediate and lower garden terraces will be indicated by the park.

3.2 WORKMANSHIP

A. Use skilled and experienced personnel, carefully supervised, in such a manner as to achieve high quality masonry to match areas in good condition. All masons shall have sufficient experience to qualify them as expert masons.

3.3 COORDINATION

A. Coordinate the work of this part of the contract with that of other pars to ensure proper sequencing and safety of the trades and avoid damage to other work.

3.4 SUBMITTALS

A. Project literature and certifications: Prior to commencing work, submit to the COR the Manufacturer’s literature on polymeric sand, cement products, and two pounds of the decomposed aggregate (a.k.a. stone dust or stone sand) to be used for setting bluestone. For mortar of steps, Contractor shall submit a sample of mortar with pigment to match existing.

3.5 BLUESTONE WALKWAY REPAIRS:

A. Description: The Terrace Garden bluestone walkway sections in need of repair cover approx. 300 sq ft. and date to the 1940s, and were rehabilitated in 2010. Some of the stones have subsequently shifted out of alignment or cracked (see Attachment A).

B. Identified walkway sections that have stones out of alignment or out of level shall be re-set to a level condition. Stones shall be temporarily removed during preparation of base and sub-base. All stones shall be numbered and keyed to plan provided by the Park. Stones shall be re-set in their original position and pattern.

C. Excavate are 4 to 6 inches minimum or to undisturbed soil (no organic material). Dispose of excavated material.

D. Wet and tamp sub grade. If more than 4 inches excavation is required, fill to 4 inches with processed gravel and compact. If less, install decomposed granite (a.k.a. stone dust or stone sand) and compact.

E. Lay stones in their original pattern, tamp with rubber mallet, and level by adding or subtracting material under stone. Keep joint uniform in width.

F. If cause of unevenness appears to be due to borrowing animals, bring to the attention of the COR.

G. Sweep polymeric sand into joints and wet area according to manufacturer’s instructions.

Polymeric sand should not stain the stone surfaces. Follow manufacturer’s instructions regarding the temperature range within which the polymeric sand must be applied.

H. Replace cracked stones in kind. Replacement stones will be equal or greater in width and match color and finish of existing bluestones (natural cleft). Provide sample of stone prior to installing.

Large stones shall not be replaced with multiple smaller stones. Install with joint’s of one-half (1/2)-inch or less.

I. The contract identifies steps that have sloped or dislocated stone treads that need to be re-set to a level and secure condition. All treads to be temporarily removed for the preparation of base and or risers shall be numbered to permit re-installation in their original location.

J. Removed stones will be stock piled onsite in a location designated by the COR. No walkway stones or walkway bricks will be removed from the site.

K. Reset stones in a compacted decomposed granite base to ensure an even walking surface of stones with less than ½ inch variation in height and without tripping hazards.

L. Reset brick edging where present. The brick edging will project one and one-half (1 ½)-inches above the bluestone walkway.

M. Reduce joints that are greater than one inch to be less than one-half (1/2)-inch.

N. Fill joints with polymeric sand to reduce weed growth. Use polymeric sand according to manufacturer’s instructions and ensure that no polymeric sand is on bluestone surfaces when wetting.

O. Minimize disturbance of adjacent flower beds and shrubs.

P. Regrade and reseed turf areas if disturbed with fescue-perennial ryegrass seed mix.

3.6 BLUESTONE STEP REPAIRS

A. Description: The Buttrick Garden Terraces contain several runs of steps, all of which have been repaired within the past ten years. Some have shifted or become loose and need to be reset in a level condition and adhered. Steps shall be set in a base of compacted decomposed granite and concrete, with a base deep enough to prevent shifting, settling, or lifting.

B. For setting steps with hydraulic cement, follow the manufacturer’s directions regarding the temperature range within which the sealant must be applied. Visible cement shall be match existing visible mortar.

C. Protect new work from rain or direct sunlight if the curing of cement can be adversely affected by washout or rapid dryout.

D. Provide sufficient barriers to keep pedestrian traffic away from steps while rebuilding. Inform the COR one day in advance of all areas which will be so barricaded.

3.7 REPAIR/INSTALL HANDRAILS ON HISTORIC STEPS (see also Part 2, (2.5.F Ironwork)

A. Repair five handrails, singe side of walkway to match existing railing (see Attachment A, Part 2, R-4): A shop drawing or specification sheet should be submitted in contractor/contractors’ proposal for the step railing materials to verify that it matches the railings depicted in Attachment A, Part 2, R-4.

B. Graspable handrails of solid black wrought iron shall extend from the top tread to the bottom tread on single side of the steps. Railings shall be wrought iron, solid not hollow, fastened to the stone steps and capable of supporting a load of at least 300 lbs.

C. The railing shall be greater than 2 inches and equal to or less than 4 inches from the stone retaining wall on each side of the steps.

D. The railing height shall be 34 to 36 inches above the treads.

E. The railing shall be continuous and without sharp corners or edges.

F. The newel posts shall be without sharp corners or edges and strong enough to withstand heavy use (300 lbs). The graspable handrail should be round (between 1.5 and 2 inch diameter) or Ogee shaped (2.25” across widest dimension). Selection of posts and handrails to be approved by the Client prior to installation.

G. Metal railings shall adhere to safety standards ASTM894 and ASTM E985.

H. Newel posts shall be set in stone core to a depth of 6 inches and set with anchoring hydraulic cement for durability. Stone face shall not have excessive residual hydraulic cement on the surface.

4 Part 4 (OPTION 1): TREE WORK

4.1 SITE ACCESS:

A. Equipment Access: Due to the site limitations for equipment access, work will require a preconstruction conference, communication, and coordination as outlined in Part 1. The Contractor shall route all equipment through existing drives, or as directed by the Park. Vehicular access is possible to the upper level and designated access to the intermediate and lower garden terraces will be indicated by the park.

4.2 WORKMANSHIP

B. Use skilled and experienced personnel, carefully supervised, in such a manner as to achieve high quality arboriculture. All arborists shall have sufficient experience to qualify them as experts.

4.3 COORDINATION

B. Coordinate the work of this part of the contract with that of other pars to ensure proper sequencing and safety of the trades and avoid damage to other work.

4.4 TREE WORK SUMMARY (Further detailed in Attachment B)

- Remove 1 tree growing in garden wall and three dead trees

- Prune dead limbs in 8 trees

- Prune deadwood from grove of mature Birds Nest Spruce

- Perform header cuts on grove of mature yew

- Remove 1 pile of branches/stacked brush stacked by volunteers

4.5 PRUNING

A. Minimize ground disturbance.

B. All cuts shall be made using International Society of Arboriculture (ISA) best management practices.

C. Natural tree forms shall be preserved to the extent possible.

D. Trees shall not be “topped” without prior approval by the COR.

E. Remove all hazardous limbs or main stems of trees, using acceptable arboricultural practices, if these parts of the tree would create a hazardous condition.

F. Remove such limbs as may be necessary for the maintenance of tree symmetry when, as in heavy pruning on one side, a condition of imbalance is caused to exist.

4.6 TREE REMOVAL

A. Trees that cannot be felled due to proximity of buildings, powerlines, monuments, or other historic features shall be topped and/or sectioned. Whenever possible trees should be felled on level ground as possible, avoiding stumps, rocks, etc. that may cause the tree to roll when it falls.

B. Pull ropes shall be used on all trees that have the potential for damage to monuments, buildings, historic fences and/or other historic features. Pull ropes shall be installed before any cutting is done at the base. Stake holdfasts and individuals pulling ropes shall be outside the striking distance of the tree. If the conditions make this impossible, the tree shall be topped and/or sectioned.

C. Removal and Disposal of All Trees Including Disposal of Debris, Clean Up, and Site Restoration.

D. All trees shall be flush cut at ground level.

E. All trees and debris shall be legally disposed of, including the recycling of all material when possible.

F. Site shall be restored to the same condition it was in before work started.

G. Work areas shall be raked clean and restored to the same condition as was present prior to the commencement of work.

H. Ruts, divots, and any and all other damage to turf, vehicles, or surrounding structures shall be repaired at Contractor’s expense.

4.7 STUMP GRINDING

I. Stumps ground in accordance with the archaeologically sensitive method depicted in the Figure below. The Park will provide an archeological monitoring specialist at the time of stump grinding.

5 PART 5: CONTRACTING OFFICER AND CONTRACTING OFFICER’S REPRESENTATIVE

Contracting Officer (CO) Jason Albright

Contract Specialist (CS) Rachael Davis

The Contracting Officer’s Representative (COR) for this project is the park’s Natural/Cultural Resource Manager.

Margie Coffin Brown Natural/Cultural Resource Program Manager Minute Man National Historical Park 174 Liberty Street Concord, MA 01742 Ph: (617) 620-2942 Fax: (978) 318-7800 E-mail: Margie_coffin_brown@nps.gov

6 PART 6: ADDRESS FOR DELIVERABLES

Park Point of Contact for Project:

Margie Coffin Brown Natural/Cultural Resource Program Manager Minute Man National Historical Park 174 Liberty Street Concord, MA 01742 Ph: (617) 620-2942 Fax: (978) 318-7800 E-mail: Margie_coffin_brown@nps.gov

7 PART 7: LOCATION OF WORK AND ILLUSTRATIONS

Work is within the Buttrick Garden Terrace area in the North Bridge Unit of Minute Man National Historical Park and located at 174 Liberty Street, Concord, MA.

Figure 1: Map of Minute Man National Historical Park showing the North Bridge Unit in Concord (left).

Figure 2. Diagram of the North Bridge Visitor Center (center of diagram) and Buttrick Gardens Area south of the building located at 174 Liberty Street, Concord, MA. The garden terraces overlook the North Bridge and the Concord River. The project area is outlined with a red box.

North Bridge Unit

Battle Road Unit

Figure 3. Diagram of Buttrick Garden Areas. The focus of this contract is the Terrace Garden subarea with some tree stabilization work in surrounding garden subareas.

Figure 4. Stump Grinding Specification: Diagram of stump grinding in archeologically sensitive areas. The stump grinding will be minimal to prevent ground disturbance. The circumference of stump grinding will not expand beyond the tree cambium and root mass. The depth of stump grinding will not penetrate below the root mass.