Lone Mtn Toilet Replacement_Construction Specs.docx

US Department of Agriculture (USDA)

Construction Specifications

Project Title NUR Lone Mountain Toilet Replacement

WP # 689413

Section 017113 – Mobilization

PART 1 – GENERAL

1.01 SUMMARY

A. This item is intended to compensate the Contractor for operations including, but not limited to, those necessary for the movement of personnel, equipment, supplies, and incidentals to the project site; for payment of premiums for bonds and insurance for the project; and for any other work and operations which must be performed or costs that must be incurred incident to the initiation of meaningful work at the site and for which payment is not otherwise provided for under the contract.

1.02 NOXIOUS WEED CONTROL REQUIREMENTS

A. Clean all construction equipment prior to entry on to the project area. Remove all dirt and plant parts and material that could carry noxious weed seeds into the project area. Only clean construction equipment inspected by the Forest Service will be allowed to operate within the project area. Treat all subsequent move-ins of construction equipment in the same manner as initial move-ins. “Construction equipment” does not include personal vehicles or support equipment that remains on the main travel route.

B. Prior to initial move-in, the contractor must make all construction equipment available for inspection by the Forest Service at an agreed upon location. Provide the Forest Service at least 24 hours advance notification when equipment is ready for inspection.

PART 2 - PRODUCTS (NOT USED)

PART 3 - EXECUTION (NOT USED)

PART 4 - MEASUREMENT AND PAYMENT

4.01 MEASUREMENT

A. The measurement for this item must be Lump Sum.

4.02 PAYMENT

A. Progress payments for mobilization and preparatory work must be subject to retainage.

END OF SECTION 017113

SECTION 024100 – WASTE MATERIAL DISPOSAL

PART 1 – GENERAL

1.01 SUMMARY

A. This Section includes the loading, handling, hauling, and placing of excess excavation material, unsuitable excavation material, clearing and grubbing debris, and construction and demolition debris.

PART 2 - PRODUCTS (NOT USED)

PART 3 - EXECUTION

3.01 WASTE MATERIAL TO BE HAULED TO A DISPOSAL AREA

A. Contractor is responsible for disposal of all excavated material not used in the construction of embankments or backfilling of trenches, or other excess material resulting from the excavation and embankment operation.

B. All unsuitable excavated material and oversize boulders must be hauled to a disposal area.

a. Oversized boulders may be broken into sizes small enough to incorporate into the surrounding site.

C. All stumps, slash and other clearing and grubbing debris must be formed into slash pile approx. 0.38 miles south of the well house.

a. The size and shape of the piled waste material must be designated by the Contracting Officer.

b. The slash pile site must be left suitable for seeding.

c. In addition to the slash pile site designated in 3.01-C, additional disposal areas may be identified as needed and must be located with 5 miles of the installation site.

3.02 WASTE MATERIAL TO BE HAULED TO A LANDFILL

A. All demolition materials, garbage, and other refuse generated must be removed from the project site and legally disposed of off Government property to an approved landfill.

B. The contractor is responsible for all costs and permits associated with landfill disposal.

C. The Government is not responsible for waste material upon its departure from the project site.

PART 4 - MEASUREMENT AND PAYMENT

4.01 There will be no separate measurement or payment for work in this Section. Waste material disposal is considered incidental to other items of work listed in the Schedule of Items.

END OF SECTION 024100

SECTION 024116 – REMOVAL AND DISPOSAL OF EXISTING STRUCTURES

PART 1 – GENERAL

1.01 SUMMARY

A. This item must consist of removal and disposal of all members and materials comprising the existing pit toilet structure.

B. Location and number of existing structures to be removed are shown in the table below:

Toilet Buildings To Be Removed

/Longitude Number of Structures to Remove

PART 2 – PRODUCTS (NOT USED)

PART 3 – EXECUTION

1. Pit Toilet Unit Removal

3. The Contractor may use any means he may elect to remove the structure while providing for the safety of the public and preservation of existing vegetation.

3. Over-excavation of the existing pit area will not be permitted.

3. To properly close the pit toilet, remove the toilet structure, add a layer of absorbent material like lime to the pit, then fill it completely with clean soil, compacting it as you go, and finally create a mound of dirt on top to prevent water from pooling and deter flies from entering; mark the area to indicate the pit's location for future reference.

1. Disposal of Material

4. All wooden, concrete, fiberglass, glass, and metal materials must be removed from the site and disposed of at a State certified landfill.

1. Backfill

5. Use clean soil without rocks to backfill the existing pit toilet.

5. Clean soil from the new vault toilet tank excavation may be used.

1. Finishing and Cleanup

6. For unit being decommissioned - After the area has been backfilled, the disturbed area must present a natural appearance and cleaned up by removing all debris and materials left from the removal of the structure.

PART 4 – MEASUREMENT AND PAYMENT

A. Method of Measurement

a. The quantity to be measured must be removal of existing pit toilet structure and completion of backfill with natural appearance.

B. Payment

a. The accepted quantities will be paid for at the contract unit price for each pay item shown in the Schedule of Items.

END OF SECTION 024116

SECTION 311100 – CLEARING AND GRUBBING

PART 1 – GENERAL

1.01 SUMMARY

This work must consist of clearing, grubbing, trimming, removing, and disposing of or treatment of timber, construction slash, and debris. This work must also include preservation of vegetation and objects designated to remain from injury or defacement, and removal and resetting concrete bollards and signs associated with site work at Lone Mountain Tree Improvement Area.

1.02 RELATED SECTIONS

A. Section 024100 “Waste Material Disposal.”

1.03 DEFINITIONS

A. Areas to be Cleared and Grubbed - The limits of clearing and grubbing will be established by this specification, by other specification items, or on contract Drawings. The Contracting Officer will designate individual trees removal and disposal.

PART 2 – PRODUCTS (NOT USED)

PART 3 – EXECUTION

3.01 TREES TO BE REMOVED

A. Individual trees to be removed will be identified by the CO.

3.02 CLEARING AND GRUBBING

A. All trees, brush, shrubs, stumps, roots, and other vegetative material and debris within the designated clearing limits, must be cleared, grubbed, removed, and disposed of except the following condition:

1. Those items designated to remain by the Contract or Contracting Officer.

B. Clearing slash must be treated in accordance with sub-section 3.4 “Slash Treatment” below.

C. Branches on remaining trees or shrubs must be trimmed to give a clear height of 14 feet above the roadbed. Tree limbs must be trimmed as near flush with the trunk as practicable.

3.03 UTILIZATION OF TIMBER

A. Timber removed under this contract must be treated as follows:

1. Trees having a diameter at breast height (dbh) of 6 inches or greater and a length of 4 feet or more, as determined by the Contracting Officer, must be saved, and remain the property of the Government. Material to be saved must be trimmed of limbs and tops, sawed into maximum 16-foot lengths, and left on site, and moved so as not to hinder site work. Where multiple trees are removed in one installation, stacking of timber within the recreation area or adjacent areas as designated by the CO may be required. Any stacking must be done in such a manner that logs are piled parallel one to the other, can reasonably be removed by standard log loading equipment, will not damage standing trees, and will not roll. Decks must be free of brush and soil.

2. Trees and Limbs having a diameter less than 6 inches must be treated as slash.

3.05 SLASH TREATMENT

A. Treatment of construction slash larger than 3-inches in diameter and 3-feet in length must be accomplished by the following method:

1. Construction slash must be hauled to the designated burn pile located on site.

B. No construction slash must be deposited in lakes, meadows, streams, or streambeds. Construction slash that interferes with drainage structures must be removed immediately.

3.06 CLEARING OR CLEARING AND GRUBBING REQUIREMENTS FOR VARIOUS ITEMS:

A. Trenches for Water, Sewer, Electrical Lines, and other Underground Utilities - If no reference is made elsewhere, a clearing of 5 feet on each side of centerline will be allowed.

B. Buildings and Campground/Picnic Area Features - Construction work must disturb a minimum of the existing terrain and plant life adjacent to the building site. Trees to be removed will be identified by the CO. Only trees, shrubs, stumps, and major roots which interfere may be removed. When excavation reveals the major roots of a live and significant tree nearby, the Contractor must not remove the tree unless it interferes with the construction and removal is authorized by Contracting Officer.

3.07 WASTE DISPOSAL

A. Debris and refuse must be disposed of in accordance with Section 024100 “Waste Material Disposal”.

PART 4 – MEASUREMENT AND PAYMENT

A. There will be no separate measurement or payment for other work described in this Section. Clearing and Grubbing associated with excavation is considered incidental to other items of work shown in the Schedule of Items.

END OF SECTION 311100

SECTION 333600 – PRECAST CONCRETE VAULT TOILET BUILDINGS

PART 1 – GENERAL

1.01 SUMMARY

A. This section applies to the fabrication and installation of a Precast Concrete Vault Toilet Building, including shipment to site (including any necessary short haul), all work necessary to completely fabricate, and installation of other manufactured accessories needed or specified in this section for a complete Vault Toilet Building.

B. Specific requirements for toilet buildings are provided in the table below:

Example of Left-Hand Plan Front Elevation:

1.03 SUBMITTALS

A. Manufacturer’s Literature: Submit literature for the following items to the Contracting Officer (CO) for approval within 10 days after award of contract. Drawings and literature must be marked to show the exact model, size, and color proposed.

1. Door, louvered vents, and door hardware.

2. Paint, interior and exterior.

3. Caulk, ground and adhesive.

4. Concrete color additive, stains, concrete curing compound and concrete sealer.

B. Shop Drawings: Submit one digital set of shop drawings of the Vault Toilet Building stamped by a Professional Engineer.

C. Design Calculations: One digital set of design calculations showing that the building is designed for the structural loads required, fabrication and transportation loads, and crack prevention and control.

D. Concrete Delivery Certificates: Supplier must furnish a certificate with each truckload of concrete delivered showing the items in the following list. Submit these certificates to the CO upon delivery of the Vault Restroom.

1. Weight of cement in each load.

2. Weight of fine aggregate in each load.

3. Weight of coarse aggregate in each load.

4. Weight of water in each load.

5. Time of day cement was added to the aggregate and water.

PART 2 – PRODUCTS

2.01 PRECAST VAULT RESTROOM

A. Vault restroom must be a single-unit vault as identified in the bid schedule. Supplier must be certified by Precast/Prestressed Concrete Institute (PCI).

B. Approved sources include:

a. CXT Incorporated- Building Division, Spokane, WA, (509) 921-8766, www.cxtinc.com

b. Missoula Concrete Construction, Missoula, MT, (406) 549-9682, www.missoulaconcrete.com

c. Or approved equal.

C. Design criteria

a. Snow Load: Designed to withstand a 250 lbs./ft roof snow load.

b. Wind Load: 120 mph, 3 second gust, exposure C in accordance with current edition of the International Building Code

c. Seismic Load: Category E in accordance with current edition of the International Building Code

d. Designed to meet the requirements of the Americans with Disabilities Act Requirements and Architectural Barriers Act Accessibility Standards as of the date of these specifications.

e. Design incorporates all design aspects of Sweet-Smelling Technology as outlined by Brian Cook for the U.S. Forest Service. ("In Depth Design and Maintenance Manual for Vault Toilets" - July 1991 - Publication No. 9123 1601)

f. Seal inside and outside of tank with two coats of emulsified asphalt or approved equal.

g. The tank must be filled with water and observed for a 48-hour period. If any leakage is observed and/or measured, the area must be repaired in a manner approved by the COR and the test repeated.

2.02 BUILDING WALLS AND SLAB

A. Floor Slab: 5-inch minimum thickness.

B. Walls: 4-inch average thickness, 3-inch minimum wall thickness at the top of the walls.

2.03 OPTIONAL POST TENSIONING

A. The contractor may elect to circumferentially post tension reinforcing steel for the floor and roof slabs to protect against leaking and cracking. Should the Contractor elect to post tension reinforcement steel in the roof slab, fluid applied elastomeric roofing may be deleted.

2.04 WALL VENTS

A. Wall vents: Airolite No. 609B, size shown on the drawings, The Airolite Co., Marietta, OH, www.airolite.com, or an approved equal.

2.05 ROOF

A. Gabled type with a turned down edge to prevent water from migrating down the bottom edge of the roof panel and back into the building.

B. Minimum 6:12 pitch and 4 ½ inch concrete thickness desired.

2.06 VENT STACK

A. Vent Stack: Must be a minimum 12-inch diameter HDPE (with a DR of 32.5) and extend from the vault to a minimum of 3 feet higher than the roof peak or approved equal. Vent Stack must be black. Vault restroom must have bird exclusion screens installed on top of vent stacks.

2.07 PRECAST CONCRETE FORM WORK

A. Construct forms of plywood, lumber, or steel sheets or plates free of defects. Forms must be removable without injuring the concrete and must be constructed to maintain tolerances between mating surfaces of building components.

B. Form liners

1. Walls: Barnwood-textured appearance.

2. Roof: Wood Shake appearance

3. Form profile and texture to be approved by the CO.

C. Form coating

1. Non-staining type that will not leave residual matter on concrete surface or adversely affect proper bonding of subsequent coatings, caulking, grout, or adhesive applied to concrete surfaces.

2. Form release agent or coating: As recommended by form liner manufacturer.

3. Coating containing mineral oils or other nondrying ingredients will not be permitted.

D. Vault

1. Provide one concrete vault area per toilet riser.

2. Each concrete vault must hold a minimum of 1,000 gallons of waste.

3. Concrete vault floor must be sloped a minimum of 1 inch per foot towards the vault cleanout.

2.08 CONCRETE REINFORCEMENT

A. Reinforcing steel: ASTM A615, Grade 60.

B. Pre-stress strand (if used): ASTM A416, Grade 270.

C. All reinforcement must be new, free from dirt, oil, paint, grease, loose mill scale, and loose or thick rust when placed.

2.09 CONCRETE MIX

A. Concrete supplier: Ready-mix or another approved precast concrete product firm.

B. Proportion cement, aggregate, and water to obtain concrete with good workability.

C. Concrete design

a. Aggregate: Coarse No. 67 (Table 2, ASTM C33)

b. Minimum cement content: 6.5 sacks per cubic yard

c. Cement type: ASTM C150 Type II, IIA, or III for building

d. Maximum water-cement ratio: 0.45

e. Slump: 3 to 5 inches by ASTM C143

f. Air content: 4-7% by ASTM C231

g. Minimum strength concrete: 4,500 psi at 28 days

h. Water: Potable

i. Admixtures:

1. Air-entraining agent: ASTM C260

2. Water reducing agent: ASTM C494, Type A

3. Use of other admixtures is subject to approval by the Contracting Officer

2.10 COLORED CONCRETE

A. Color additives: ASTM C979. Provide a 12” x 12” x 1” color sample to the Contracting Officer for approval. The following components must contain colored concrete:

1. Building roof panels

2. Building wall panels

2.11 CONCRETE CURING COMPOUND AND ROOFING

A. Curing compound: Colorless, ASTM C309, Type 1 or 1-D.

B. Fluid Applied Elastomeric Roofing: Acrylic latex resin-base elastomeric roofing material applied in fluid form suitable for use over concrete roof slabs. If manufacturer elects to post-tension roof panel, the roofing material may be deleted.

1. Color: To match roof or wall color

2. Material: “Rapid Roof” as manufactured by the Conclin Company or an approved equal.

2.12 CAULKING, GROUT, ADHESIVE, AND MORTAR

A. Caulking must remain flexible and non-sag at temperatures from -50° to 140° Fahrenheit.

1. Exterior, roof peak joint: 100% silicone caulk, clear; GE Silicone II or an approved equal.

2. Exterior joints (including roof/wall and wall panel joints): Tripolymer sealant caulk which compliments exterior color and has a minimum 5-year guarantee.

3. Interior joints: Paintable silicone-based caulking with a minimum 5-year guarantee.

B. Grout: Non-shrink type matching color of surrounding concrete as closely as possible.

C. Epoxy concrete adhesive: Two component, rigid, non-sag gel adhesive for bonding to dry or damp surfaces, moisture insensitive. Color to match surrounding concrete as closely as possible.

D. Portland cement mortar: One-part Portland cement, three parts sand, and enough water to make a workable mixture.

2.13 FINISHES AND PAINTS

A. Paint and accessory materials: Similar to the “top-of-the-line” products of the manufacturer’s listed below.

1. Benjamin-Moore and Company, www.benjaminmoore.com

2. Columbia Paint Company, www.columbiapaint.com B. Maximum lead content: 0.06 % by weight of lead.

C. Type of Paint

1. Metal, interior and exterior

a) Waterborne acrylic bonding primer, Columbia 04-022, or an approved equal.

b) Alkyd-oil Based Enamel, semi-gloss, Columbia 03-241, or an approved equal.

2. Exterior Concrete

a) Stain- pure acrylic water repellent penetrating stain

b) Sealer- clear acrylic anti-graffiti sealer

3. Interior Concrete

a) Floors- 1-part water-based epoxy with a silica sand suspension to provide a uniform texture.

b) Interior walls and ceiling- modified acrylic, penetrating pigment followed by a clear acrylic anti-graffiti sealer.

D. Paint colors

1. Metal window and door frames, louvered vents, and doors (interior and exterior): Java Brown (CXT), Anodized Bronze (Missoula Concrete)

2. Exterior concrete walls and floor: Cappuccino Cream (CXT), Dark Brown (Missoula Concrete)

3. Exterior concrete roof: Charcoal Gray (CXT), Dark Gray (Missoula Concrete)

4. Interior concrete walls: White

5. Interior concrete floor: Gray E. Paint colors – Pearson Trailhead: Exterior colors to be selected to match existing building colors as closely as possible.

1. Metal window and door frames, louvered vents, and doors (interior and exterior): To be provided by CO from CXT Inc., color chart

2. Exterior concrete walls and floor: To be provided by CO from CXT Inc., color chart

3. Exterior concrete roof: To be provided by CO from CXT Inc., color chart

4. Interior concrete walls: White

5. Interior concrete floor: Gray

2.14 STEEL DOORS

A. Doors: Flush panel type, 1 ¾ inch thick, minimum gauge zinc-coated steel panels, with minimum 18-gauge internal bracing channels, equal to Steelcraft L-16 of size shown on the drawings.

B. Door frames must be knockdown or welded type, single rabbet, minimum 16-gauge zinc-coated steel, width to suit wall thickness, equal to Steelcraft.

1. Three (3) rubber door silencers must be provided on latch side of frame.

C. Door frame anchors

1. Provide three (3) anchors per jamb located approximately at the same level as hinge locations.

2. Use anchor type suitable for fastening to precast concrete and designed for future removal of frame.

3. Anchors may be omitted if frame is cast in panel.

D. Door hinges

1. One (1) pair must be 4 ½ inch spring hinges.

2. One-half (½) pair must be standard butt hinge.

3. Top and bottom hinge must have an adjustable tension spring and be adjusted to a 5 lb. maximum pull.

4. Finish must be US26D (dull chrome) E. Deadbolt must be Mortised type, operated by key from outside only. Finish must be US26D (dull chrome).

F. Lockset

1. Meets ANSI A156.2 Series 4000, Grade 1 cylindrical lockset for exterior door.

2. Lever handle both inside and out.

3. Either handle operates latch unless outside handle is locked by inside push-button.

4. Push-button will automatically release when inside lever handle is turned, or door is closed.

5. Emergency slot on exterior so door can be unlocked from the outside with a coin, screwdriver etc.

6. Inside lever always active.

7. US26D (dull chrome) finish to match deadbolt.

G. Door Louver must be fixed, inverted split Y, non-vision, 18-gauge galvanized steel with factory prime coat, equal to FDLS series by Anemostat Door Products, www.anemostatwest.com. There must be no insect screen between louvers.

H. Door sweep must be an adjustable brush type placed at bottom of door.

I. Doorstop must be a cast metal base, US26D (dull chrome) finish with gray rubber 2 3/8-inch diameter bumper with a 1-inch projection.

J. Threshold must be extruded aluminum with neoprene seal, Pemco #170, or an approved equal.

2.15 INTERIOR HARDWARE

A. Grab Bars: Grab bars must be 18-guage type 304 stainless steel, 1 ½ inch diameter with 1 ½ inch clearance; minimum of length required for accessibility standards. Able to withstand 300-pound top load.

B. Toilet Paper Dispenser: Constructed of ¼” thick, type 304 stainless steel. Holds three (3) standard rolls of toilet paper. Fastening system able to withstand 300-pound top loading.

C. Double Coat Hook: Formed construction, type 304 stainless steel (Satin Finish), 16-guage minimum.

D. Toilet riser: Toilet riser must be molded, smooth one-piece constructed of HDPE polyethylene, cross linked polyethylene, or stainless steel. With heavy duty seat and lid (Color: White); Meeting ADA/ABA standards. Apply Butyl rubber adhesive sealant to the top surface of the concrete vault before placing the structure on the vault.

2.16 SIGNS

A. Signs: Signs to have raised pictograms, letters, and braille to meet ADA. Signs must designate standard unisex symbol for single units or separate men’s & women’s for double units. All signs to be securely anchored into concrete with tamper resistant anchors.

2.17 WINDOWS

A. Window frames must be constructed from steel tubing and fasten water-tight to building with vandal resistant fasteners.

B. Window glazing must be translucent pebble finished mar-resistant Lexan polycarbonate. Minimum thickness of ¼ inch.

2.18 VAULT CLEANOUT

A. Frame: must be constructed from steel frame poured integral with the concrete slab.

B. Cover/Lid: must be constructed of minimum ¼ inch steel. Must be hinged to the steel frame. Configured with a locking mechanism that will receive a government furnished padlock.

C. Gasket: Cover/Lid must be gasketed around the entire perimeter of the lid to provide an airtight seal.

2.19 CRUSHED AGGREGATE LEVELING COURSE

Sand.

2.20 VAULT LINER

A. Made of a Roto molded 8460 polyethylene or equal B. Holds up to 1,000 gallons of waste C. Minimum thickness .100” D. Molded dovetail embeds to attach the liner to concrete walls of the vault or similar.

E. Welded to two (2) C-channels to attach the liner to the bottom of the vault.

PART 3 – EXECUTION

3.01 BUILDING CONSTRUCTION

A. Concrete

1. Support and brace forms sufficiently to prevent distortion of forms due to pressure of the concrete during vibrating of concrete and the curing period.

2. Vertical grooves in the form liner pattern must be continuous except for openings for doors.

a) Horizontal butt joints between liner panels will not be allowed.

b) Vertical butt joints between form liner panels must be made at vertical groove in liner pattern except at outside corners.

c) Vertical grooves in form liner pattern must be arranged so that there is equal space between vertical doorframe edges and the adjacent vertical grooves at each opening.

3. Form ties will not be allowed.

4. Thoroughly clean forms and form liners before each use.

5. Apply form coating and form release agent on all forms and form liners in accordance with the manufacturer’s recommendations

6. The Contractor must assume all responsibility for determining when to remove the concrete components from the forms without causing structural damage to the components. Vault Restrooms constructed with damaged components will be rejected.

B. Concrete Reinforcement

1. Details of reinforcement: ACI 318.

2. Center steel reinforcement in the cross-sectional area of the walls. Provide at least 1 inch of concrete cover on the under surface of roof and floor. Provide diagonal reinforcement at openings.

3. Accurately place and adequately support reinforcing steel or strand in final position prior to starting placement of concrete. The maximum allowable variation for center-to-center spacing of reinforcing steel is ½ inch.

4. Use full length reinforcing steel whenever possible and keep the number of splices to a minimum. When splices are necessary on long runs, alter splices from opposite sides of the component for adjacent steel bars.

a) No. 4 or smaller must be lapped a minimum of 12 inches.

b) Larger than No. 4 must be lapped a minimum of 24 bar diameters.

5. Bend bars cold. Do not bend bars partially embedded in concrete C. Cold Weather Concrete

1. Cold weather concrete: ACI 306 and as follows:

a) Do not place concrete if ambient temperature is expected to be below 35°F during the curing period unless heating equipment is readily available to maintain temperature of at least 45°F.

b) Use no materials containing frost or frozen lumps.

D. Hot Weather Concrete

1. The temperature of the concrete must not exceed 80°F at the time of placement, and when the ambient temperature reaches 90°F, the concrete must be protected with moist covering or other methods approved by the Contracting Officer.

E. Mixing and Delivery of Ready-Mix Concrete: ASTM C94, Section 11.5 through 11.9.

F. Placing and Consolidating Concrete

1. Notify the Contracting Officer at least 24 hours before any concrete placement to permit inspection.

2. Place layers not more than 24 inches deep. Do not move concrete with vibrators or tampers.

3. Consolidate the concrete with suitable mechanical vibrators operating within the concrete or attached steel forms. Vibrate at any point sufficiently to accomplish compaction, but do not prolong to a point where segregation occurs.

G. Finishing Concrete

1. Interior Floor and Exterior Slab

a) Strike flush to within 1/8-inch variation in 6 feet.

b) Float and trowel slabs smooth until no marks remain.

c) Apply final light broom finish to exterior slabs only.

2. Interior Wall Surfaces and Ceiling

a) Finish must be that provided by smooth steel form or smooth trowel finish with no trowel marks.

3. Exterior Wall Surfaces: Barnwood texture provided by approved form liner.

4. Exterior Roof Surface: Shake texture provided by approved form liner.

5. Cracks and Patching

a) Cracks in concrete components caused by Contractor fabrication, shrinkage during curing, handling, shipping, and installation must be cause for rejection if the Government determines that the crack will affect the serviceability or structural integrity of the component.

b) Fill small holes, depressions, and air or rock pockets in all surfaces with non-shrinking Portland cement based patching material while concrete is still green and within one day of form removal. Patch must match the color, finish, and texture of surrounding surface.

c) Patching will not be allowed on any component with holes, chips, or exposed reinforcement totaling more than 18 in2 or with any defects more than 2 inches deep. Those components will be rejected and must be replaced at Contractor’s expense.

H. Curing and Hardening Concrete

1. Keep all concrete surfaces moist for at least six days after being placed. Acceptable methods include ponding, wet burlap, curing paper, plastic sheets, and membrane curing compound. Other methods are subject to the approval of the Contracting Officer.

2. Membrane curing compounds will not be allowed where curing compound will interfere with penetration or adhesion of final finish.

I. Colored Concrete

1. Use the same type and brand of cement, coloring agent, aggregates, and other additives throughout the building. Use ingredients from the same lot or manufacturing process. Use aggregates from only one source.

2. Use uniform batches of concrete to ensure consistency of the finished concrete color. Weigh all ingredients. Add color by weight as recommended by manufacturer of the concrete color. Uniformly disperse the color throughout each batch during the mixing operation.

a) Wash and thoroughly clean the mixer and transporting equipment before mixing colored concrete. Repeat each time a change is made to a different color.

J. Structural Joints

1. Joining details other than those detailed below will not be allowed unless shown on shop drawings that are stamped by a Professional Engineer and approved by the Contracting Officer prior to manufacture of buildings.

2. Anchor weld plates into concrete panels and weld together with a continuous weld. Thoroughly clean welds prior to application of caulk or paint.

3. Join wall components together with two welded plate pairs at each joint.

a) Weld plate: 6 inches long; with one pair located in the top quarter and one pair in the bottom quarter of the seam.

b) Seal inside seams with paintable caulk.

c) Seal outside seams with caulk to match building color or clear.

4. Join walls and roof with weld plates, minimum 3” x 6”, at each building corner.

(1) Where the Contracting Officer determines that the joint between walls and the roof is true enough to prevent point loadings on the walls, seal the joint between walls and roof gas-tight with paintable caulk.

(2) Where the joint between the walls and roof is not true enough to prevent point loading, grout the joint with approved rigid non-shrinking grout that will distribute the weight of the roof evenly around the perimeter of the building walls.

(3) Seal exterior seams with caulk that is clear or matches building color.

5. Join the floor slab and walls with a grout mixture on the interior and two weld plate pairs for each wall component, one near each end of each wall panel, or each corner on each side, whichever is greater.

a) Weld plate: 6 inches long

b) Grout: Provide smooth cover between walls and floor K. Finishes and Paint

1. Apply materials in accordance with manufacturer’s recommendations.

2. Examine surfaces to ensure all are properly prepared to receive finish.

a) Allow a minimum of 14 days curing time for concrete before paints are applied to concrete. Allow longer time when recommended by paint manufacturer.

b) If needed to ensure uniform application, prepare concrete surface for paint application by acid etching with 30% H=hydrochloric acid. Flush with water and allow to thoroughly dry.

3. Painting must not be done under the following conditions:

a) Temperature is 50°F or below.

b) Surfaces are damp.

c) Dusty areas.

4. Schedule of Finishes

a) Metalwork (steel doors, door vents and frames, and roof posts)

(1) One coat metal primer

(2) Two coats alkyd oil enamel

b) Exterior surfaces of building walls and roof, unless concrete color manufacturer recommends a different procedure:

(1) Two coats of stain

(2) Linseed oil (may be applied and allowed to cure for brown buildings)

(3) One coat of clear sealer

c) Interior Concrete Surfaces

(1) Walls and ceiling of building: Two coats of pigment followed by one coat of clear sealer.

(2) Interior floor: One coat of epoxy with a silica sand suspension.

L. Fluid Roofing

1. Apply a minimum of two coats of elastomeric roofing on top of the roof slab.

a) Prepare concrete surface and apply and cure roofing in accordance with manufacturer’s recommended procedures.

b) Minimum coverage: 3 gallons per square (100 ft2)

c) Apply joint tape to hairline cracks between applications of the two coats of elastomeric roofing.

2. This item may be deleted if there are no cracks.

M. Metal Doors and Frames

1. Install steel doorframe in accordance with manufacturer’s recommendations.

a) Fit door accurately in frame and ensure proper closure.

b) Mount louvers on door with cadmium or zinc-plated corrosion resistant non-removable metal screws.

2. Install hardware in accordance with manufacturer’s instructions after finish painting is completed.

3. Install sweep on bottom of door and adjust so it contacts the threshold when door is closed.

3.02 CLEARING AND GRUBBING

A. Site clearing and grubbing must be in accordance with Section 311100 “Clearing and Grubbing”.

3.03 EXCAVATION, BACKFILL, AND SITE GRADING

A. Excavation, backfill, and site grading must be in accordance with manufacturer requirements and contract specifications.

B. Keep the work site free from accumulation of waste materials and rubbish resulting from the work. Clean areas daily as required to maintain a safe working site.

C. Provide and maintain, at all times during construction, ample means, and devices with which to promptly remove and properly dispose of all water entering the excavations or other parts of the work without damage to adjacent property. All excavations must be kept free from standing water. Any damage caused by water in the excavation must be repaired by the Contractor at his expense.

D. Meet the prescribed safety rules and regulations. Walls of excavations 4' or more in depth must be supported by bracing, shoring, or other methods, unless the walls are sloped to a safe angle from the bottom. If shored, the excavation must be of proper width to accommodate shoring and bracing, as required, to keep walls from collapsing, and to allow for proper installation of the work. All existing improvements, either on public or private property, will be fully protected from damage. All supports must be removed after construction is completed and must be withdrawn in a manner that will prevent the collapse of the sides of the excavation. All openings in the ground, caused by the removal of supports, must be filled with suitable material properly compacted.

E. Conservation of Topsoil

1. Topsoil must be removed from the area to be excavated and from the area where excavated material will be piled prior to excavating. Topsoil must be kept separate from excavated material. Topsoil will be reused on those areas from which it came after backfilling and embankment construction is complete.

F. Coordination with the Building Manufacturer

1. Contractor must coordinate with the manufacturer of the precast concrete building to accommodate installation at the time of delivery.

2. The Contractor must be responsible to obtain installation instructions from the manufacturer and perform the excavation, bedding material and compaction, backfill, and site grading in accordance with those instructions.

3. The Contractor must have excavation, bedding material and compaction complete prior to delivery of the precast concrete building.

a) Stockpile excavated material away from the excavation to facilitate crane and delivery truck access. The crane and delivery truck typically need to be side-to-side during placement.

b) Compact the natural ground or bedding material depending on manufacturers specifications at the bottom of the vault excavation with a minimum of three passes with an approved whacker-type mechanical tamper.

4. The Contractor must be on site at the time of delivery to perform the backfill operation as soon as the precast concrete building is in place.

G. Bedding

1. The Contractor must place a leveling course prior to placement of the vault or building.

2. Compact leveling course with one pass of an approved mechanical tamper.

3. Grade leveling course so there will be no high spots in the middle.

4. Compact with a second and third pass of a tamper.

5. Slope the top of the bedding one percent from back to front of building.

H. Backfill

1. Backfill must be permitted only after the work to be covered has been approved by the Contracting Officer.

2. Backfill must be placed in 8" thick (loose measurement) lifts and compacted with two (2) complete passes of an approved vibratory compactor.

I. Finish Grading

1. All surfaces and slopes must be shaped to blend with the original ground line, mounded over or smoothed off, and raked, and left in a uniform and neat condition. Stockpiled topsoil must be smoothly distributed over disturbed areas and hand raked to blend with ground line. Final grade must be flush with top of front slab to provide accessibility.

2. The surface must be graded and shaped as shown on the drawings. Surface drainage must be diverted so that water will drain away from the structure and does not enter area around structure.

J. Cleanup

1. After backfilling and grading has been completed, the disturbed area must be finished to present as near a natural appearance as possible and cleaned up by removing all debris, rubbish and materials not utilized.

2. Clean building walls, floors, and roof using soapy water.

PART 4 – MEASUREMENT AND PAYMENT

A. Payment will be for each (EA) Single Precast Concrete Vault Toilet Building installed including all appurtenances to the building and all associated clearing, excavation, fill, aggregate, backfill and grading necessary to complete the item.

END OF SECTION 333600

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