B08_ATTACHMENT_B_SOW.pdf

SCOPE OF WORK FOR CONSTRUCTION

Replace ‘Hole in the Wall’ Visitor Center Porch Roof

Mojave National Preserve San Bernardino County, California

1.0 BACKGROUND & PROJECT DESCRIPTION:

The Mojave National Preserve is located between Los Angeles and Las Vegas, south of the Interstate 15 freeway and about 65 east of Barstow CA. This contract is for the procurement of skilled labor to install a roughly 2,000 square feet metal roof over the patio at the Hole in The Wall Visitor Center (HITW VC). The former roof was dislodged from the building during Hurricane Hillary. After inspection, the old roof used an inadequate fastening system to secure the roof to the building. This project would install new moisture barrier, galvanized/galvalume steel roof system with concealed fasteners, metal ridge caps, metal flashing / trim. Twelve-inch wide, 24-gauge standing seam panels will be used to install #9 Metal to wood screw into the roof rafters which are space 24-inches on center to assure resiliency in strong winds. The color of the roof will be matched as close as possible to the existing. An Optional bid item is included for repair/replacement of damaged/defective sheathing or structure member should contractor discover after removing existing roof. Optional Bid item #2 for sheathing/rafter repair will be evaluated with total quoted price and is expected to be exercise no later than 14 days after NTP for on-site work, as the POP is 21 days beginning from mobilization.

Offerors are urged to visit the job site during the scheduled pre-bid site visit, examine existing conditions and perform material take-offs before submitting bids.

2.0 PROJECT LOCATION:

PHYSICAL ADDRESS

2 Black Canyon Road Essex, CA 92332

Directions: From I-40: Exit Essex Road and drive north 10 miles to the junction with Black Canyon Road.

GPS Coordinates: 35°02'33"N 115°23'45"W

3.0 PERIOD OF PERFORMANCE:

- Period of Performance to begin at award, expected by 4/14/24, and end 5/20/24 (35 days)*

Action Due Days After Award Approximate Date* Bonds & Liability Insurance 5 4-19-24 Notice to Proceed #1 5 4-19-24 Division 1 Submittals 8 4-23-24 Division 2+ Submittals 11 4-26-24 Preconstruction Conference 11 4-26-24 Notice to Proceed (onsite work) 14 4-29-24 Mobilize by date 21 5-06-24 Period of Performance Ends 35 5-20-24

* Period of Performance dates may be adjusted based on award date.

4.0 BID ITEMS

1. Replace Roof, underlayment, flashing, gutters and downspouts IAW this scope of work.

a. Unit – Lump Sum

b. Unit price includes all necessary labor, materials, and equipment to perform the above.

Replace Hole in the Wall Visitor Center Porch Roof

2. OPTION: Repair Structural/Sheathing Defects/Damages, IAW this scope of work.

a. Unit – Square Foot

b. Unit price includes all necessary labor, materials, and equipment to perform the above.

4.0 CONTRACTOR’S USE OF PREMISES:

A. Closures: Contractor shall always conduct operations to ensure the least inconvenience to the public and park.

B. BARRIERS: Provide barriers to protect existing facilities and pedestrians from construction operations. Fence off the work area to prevent unauthorized entry using plastic fencing and barrier tape. Install barrier tape where directed by Contracting Officer’s Representative

(COR).

C. Storage: Confine storage of materials to the designated on-site storage area, located within the NPS designated storage site. (within ¼ mile of worksite). COR will be able to show this location during the site visit. See image below.

D. Restrooms are available at HITW for use of contractor.

E. Electrical service is available at HITW for use of contractor.

F. Potable water is available at HITW for use of contractor.

G. Housekeeping – Keep project neat, orderly and in safe condition. Provide containers for collecting construction debris. Daily magnet sweeps shall be conducted to remove all metal fasteners form the ground. There is no smoking allowed on the jobsite.

H. Accident Reporting: The Contractor shall report all accidents to the Contracting Officer’s

Representative as soon as possible and assist the contracting and park officials as required in the investigation of the accident, if required.

I. Personnel Protective Equipment: Meet requirements of NIOSH and MSHA, where applicable, as well as ANSI and OSHA.

5.0 SPECIAL CONSTRUCTION REQUIREMENTS –

A. The buildings may be occupied by staff during the project duration. Excessive loud conversations, radios, etc. will not be allowed. Contractor shall maintain a watertight roof at the end of each workday and during periods of inclement weather. Any damage to building’s interior finishes and furnishing shall be repaired or replaced at no additional expense to the government. Interruptions of building electrical systems should not be necessary. However, if they do occur interruptions shall be kept to a minimum and performed during the time approved by the Contracting Officer. Reinstall all components temporary removed from the roof or disconnected back to same operating conditions.

B. Contractor should verify the compatibility of existing roof materials and take into consideration the necessary steps or construction measures to ensure guaranteed performance of the new roofing material.

C. When placing materials or equipment on the roof, Contractor shall not impart loads on the roof more than 40 pounds per square foot unless approved by the COR.

D. The contractors work hours are between 6:30 AM and 6:00 PM Mondays through Friday.

Weekend and holiday work must be approved in advance by the COR.

E. The building’s electric service is supplied by solar generation and a backup generator. The contractor is urged to conserve power during the duration of the project.

6.0 PROJECT TASKS

The following tasks shall be completed by contractor as a part of this contract:

A. Remove tarps, boards, fasteners, and debris from roof for preparation of installing moisture barrier. Contractor to dispose off site.

B. Check substructure for proper alignment, pattern, and uniformity to avoid panel distortion.

Contractor to Repair/Replace in kind if defects/damage is found. Contractor shall photo document all defects/damages and present to COR before attempting to repair. Government may elect to exercise the option to repair at the agreed upon unit price (bid item #2).

C. Install weather resistance barrier (WRB) in accordance with manufacturer’s specification which will determine material overlap, fastener type and length, correct laydown side, and tape and adhesives. Installation should comply with IBC Section 1507 or IRC Section R905 since area is subject to high winds.

D. WRB shall be protected from damage until the roof panels are installed. However, if membrane is damaged, repair of the membrane is necessary prior to panel installation.

Always install WRB in such a manner that will allow for water shedding.

E. Prior to installation of steel panels, roof should be swept clean of any debris and inspected by

COR.

F. Care should be taken to place clip snug against vertical leg of panel and flush on the substructure surface.

G. For proper appearance, ribs must line up at valleys and ridges/hips.

H. Use at a minimum #10 3inch pancake head screws to fasten panels at the manufacturer’s recommended spacing.

I. Each panel shall be checked for vertical alignment and must be at least 1” within vertical level.

J. Install metal ridge caps, wall, and drip edge flashing, and all associated fasteners per manufactures typical design. Contractor to use materials according to manufacturer specs to prevent windblown water damage. (See example in photos section)

K. Final roof product must be watertight to the building and protect structure and patio from moisture and related issues that could cause future system failure. Contractor to replace all End wall flashing and counter flashing.

L. Remove existing and install new new gutter system and downspouts to be replaced in-kind wrapping the exterior of the roof system and utilize existing locations for the downspouts.

Color and size will match existing.

7.0 PRODUCT

A. Metal Roof Basis of design: MBCI Craftsman Series Small Batten Fastening Concealed Roof System, or equal.

Salient Characteristics:

1. 1-inch-high x 3⁄8 inch wide battens (Small Batten SB) on 12-inch wide panels.

2. Snap on batten with factory applied mastic.

3. Concealed fastener.

4. Gauge: 24

5. Substrate: Galvalume sheet steel, 0.5 ounces/square foot, minimum yield 50,000 PSI.

6. Premium fluorocarbon coating produced with Kynar 500 or Hylar 5000 resin (20-year warranty).

7. Bare Galvalume (20-year warranty).

B. Roofing Moisture Barrier Basis of Design: Owens Corning Weatherlock Specialty Tile and Metal Waterproofing Underlayment, or equal

Salient Characteristics:

1. .065 thick waterproof breathable membrane material

2. Class A UL 790 Fire Rating

3. Specific to metal roofs

4. Self-adhering

8.0 WARRANTY

System Roofing Manufacturer’s Warranty: Upon completion of the work, submit a written and signed (15) fifteen-year labor and material warranty, without monetary limitation, signed by roof system manufacturer agreeing to promptly repair leaks in the roof membrane and base flashing resulting from defects in materials or workmanship. The roofing manufacturer shall certify the performance of the products and the consistency of the properties of such products affecting the performance and the installation of the product for a period of 15 years from date of final acceptance.

Installer’s warranty: Submit the roofing Installer’s warranty, signed by Installer, covering all Work in this section, including membrane roofing, base flashing, fasteners, and nailers, if any, against defects in materials and workmanship for a period of (1) one year following final acceptance of the Work.

9.0 SUBMITTALS

Submittals shall be submitted via email to jeremy_petruncio@nps.gov and CC contracting officer. Submittals shall be attached to CM16 transmittal cover sheet, supplied by contracting officer.

A. Division 1 Submittals: All submittals must be approved before the preconstruction conference is held. No progress payments will be made until submittals are accepted.

1. Accident Prevention Plan

- The Plan shall be written to comply with OSHA and project requirements including but not limited to the following information/topics:

- The name of the responsible supervisor who shall carry out the program.

- Documentation of the personnel training program; both initial and continuing.

- Weekly and monthly safety meetings.

- First aid procedures.

- Outline the work, associated hazards, protective measures, and the methods proposed to ensure property protection, safety of the public, National Park Service personnel, and Contractor's employees.

- Planning and checklists for possible emergency situations.

- A fire protection plan.

- And a fall protection plan.

2. Project Schedule

3. Schedule of Values

4. Letter designating site Superintendent

5. SF1413 Subcontractors

B. Product Submittals shall be submitted to COR for approval no later than 11 days after contract award.

1. Metal Roofing

2. Moisture Barrier

3. Roof and Flashing Fasteners

4. Product Colors

5. Gutters and Downspouts

6. Ridge Caps

7. Flashing

10.0 DEBRIS AND WASTE REMOVAL

A. Remove construction debris and trash from site. No debris piles are permitted to be left on the ground. Use of roll off dumpster, dump trailer, etc. is required. Use of trash receptacles for other waste (food, packing, etc.) is required.

B. Remove from site all materials not to be reused on site.

C. Leave site in clean condition, ready for subsequent work.

D. Clean up spillage and wind-blown debris from public and private lands. Magnet sweep ground daily for stray fasteners. Leave no food waste, packing, cigarette butts or other refuse behind.

11.0 PHOTOS

Figure 1: Photo of Side of Visitor Center

Figure 2: Photo of roof sheathing and rafters.

Figure 3: Photo from underneath patio roof

Figure 4: Photo from patio looking at beams and supports

Figure 5: Photo from roof top looking west

Figure 6: Photo from roof top looking north