B08_Atch_1_SOW_Precast_Concrete_Vault_for_LLCG_2024.pdf

SCOPE OF WORK

This project is for the purchase and installation of a Double Room w/Storage Chase, Precast Concrete Vault Restroom at the Lower Lehman Campground project at Great Basin National Park, Baker, Nevada, 89311.

PRODUCT:

Qty. One (1) Double Room w/Storage Chase, Precast Concrete Double Vault Restroom: An example of an acceptable product is: Boom Concrete, Inc., 605-456-2600, Clovermist Model, or approved equal. All paints and materials will conform to all Federal specifications

Features:

Doors: Steel Door- A 3’-0” x 6’-8” x 1 ¾” thick, 18-gauge steel flush door will be installed in each toilet w/commercial grade heavy duty cylindrical locksets, lever handles inside and out, inside push button for exterior doors. Mortised Type deadbolts, Spring door hinges w/adjustable tension, automatic closing.

Door sill seals shall be provided at the bottom of each door. Door louvers will be mounted on each door, with a 18-14 screen mesh. Door bumpers measuring approximately 2 3/8” in diameter shall be mounted to the exterior of the doors.

Windows: One window per toilet, measuring approximately 20” x 36”, w/1/4” Lexan polycarbonate, clear/opaque glazing finish.

Signs: UNISEX signage that also meets ADA-ABAAS standards that will be mounted on the exterior wall of the toilet adjacent to the latch. Interior signage will read “PLEASE DO NOT PUT TRASH IN TOILETS. IT IS EXTREMELY DIFFICULT TO REMOVE- Thank you”

Toilet Riser: Toilet Riser shall be 18” high for the toilet, white in color, polyethylene, heavy duty seat and lid.

Grab Bars: Stainless steel, 18-gauge materials, satin non-slip finish, 1 ½” outside diameter tubing, mounted to ADA standards.

Toilet Paper Dispensers: Bar-type, shall be constructed of stainless steel with a satin finish. Designed to hold 3 standard rolls of toilet paper, predrilled and slotted for locking the bar.

Concrete Wall Texture: Simulated Barnwood-Sandstone

Roof: Simulated cedar shake textured roof in in a Sandstone/Teakwood color.

Double Vault Capacities: 1000 gallons each w/double plastic vault liner.

Double Vault Cleanouts: Shall be a raised steel frame measuring approximately 21”x 34”. The door will be ¼” Diamond plate steel and will be hinged at the back with a locking hasp that accepts a standard padlock. The vault cleanout door will have a continuous rubber gasket around the perimeter which will provide an airtight seal.

Vault Vent Pipe: Shall be a 12” diameter polyethylene plastic pipe, high density, black color, UV stabilized HDPE pipe, and shall also have a screen/rain cap.

INSTALLATION:

Materials

Park shall provide the bedding material that is to be used for setting the concrete vault section to the precast concrete vault section of the restroom.

Location

It’s the responsibility of the Park to provide the exact location for installation by stakes or other approved method. Park shall clear and level the site free of overhead obstructions. Contractor is responsible for clearing any underground obstructions. Park shall provide access to the site for truck delivery and sufficient area for contractor provided crane to install and equipment to perform the contract work requirements.

Excavation and Elevation

Contractor shall comply with all applicable OSHA Standards for excavation. Excavate for the installation of the concrete restroom vault to a depth that will allow the structure site to be free draining after installation is completed. Place at least a 2-3” leveling base material (Park provided) beneath the restroom vault. Stockpile topsoil removed from excavation in a separate pile at site.

The finish floor elevation shall be 6 inches above the natural grade measured at the front entrance door unless otherwise approved by the Park. Ideally, the back of the vault shall be slightly higher to allow water to freely drain out of the toilet rooms. The Park may specify a finish floor elevation within a plus or minus 0.05 feet of the specified floor elevation.

No excavation shall be left open for more than two (2) days. Any excavation left open overnight shall be fenced with wire or plastic mesh fence (minimum height of 36 inches) and secured to steel posts placed ten (10) feet apart. The bottom of the fence shall follow the contour of the natural ground around the excavation.

Backfill and Compaction

Contractor shall compact the natural ground at the bottom of the vault excavation with a minimum of three passes with a whacker-type mechanical compactor (jumping jack), or equivalent.

Install base material for leveling course. Compact leveling course with one (1) pass with a whacker-type mechanical compactor (jumping jack), or equivalent approved by the park. Grade the leveling course so there will be no high spots in the middle of the concrete vault bottom. Compact with a second pass with a whacker.

Set vault in place. Backfill around structure. Use excavated material for backfill except that rock larger than six (6) inches shall not be placed within six (6) inches of the exterior vault walls.

Fill, adjacent to the building entry shall have excavated material placed in eight (8) inch loose lifts and compacted with a minimum of two passes with a whacker-type mechanical compactor (jumping jack), or equivalent.

Finish Grading

Spread excess excavated material from the vault around the precast concrete restroom structure.

Intended final grade is six (6) inches below the finish floor at the front entrance door unless otherwise approved by the Park. These six (6) inches of space as the finished and final layer under this contract will allow room for the placement of the final road base and pavement at a later date under a separate contract.

All areas disturbed by excavation, backfilling, and stockpiling of excavated material shall be hand raked to remove exposed rocks over one (1) inch in size. Oversized rocks shall be removed from the surface and disposed in a designated area within 200 feet of the site.

Precast Concrete Restroom

Contractor will apply the provided seal between the vault and concrete floor before the toilet riser is installed. Contractor will seal and install the exhaust piping and roof structure to restroom structure in accordance with, and conforms to the manufacturer’s specifications for a completed, ready for use restroom facility.