AG03K0S150008_Project_Specifications.pdf

AG-03K0-S-15-0008

Lewis & Clark National Forest

Whitetail Campground Concrete Vault Toilet Installation and Demolition

Project Specifications

PART I

DESCRIPTION OF WORK

A. This contract consists of manufacture, fabrication, delivery, and installation of a pre-cast concrete vault toilet building and pre-cast sidewalk pads in accordance with the attached drawings and specifications.

B. Project also includes the removal/disposal of the existing toilet building and vault and backfilling of existing toilet vault.

STORAGE

A. Contractor will be allowed to store materials at project site in location approved by

COR. Contractor shall be solely responsible for loss of or damage to any materials or equipment stored on project site. Materials which show weather or other damage will be rejected.

CLEANUP

A. When working in an area open to public use, Contractor shall clean and maintain the work site to minimize hazards to the public. At the end of work in each area, Contractor shall collect all refuse, garbage, rubbish, solid wastes, and liquid wastes from the Contractor's camping, parking, and equipment maintenance areas, and project area, and dispose of them at a State-approved disposal site. Waste from the

Contractor's trailer toilet holding tank shall be disposed of at a State-approved site.

B. Motor and gear oil from Contractor's equipment shall not be drained on the ground.

Used oils are considered liquid wastes and must be disposed of offsite in accordance with State disposal regulations.

USE OF GOVERNMENT FACILITIES

A. Sanitary Facilities: Sanitary facilities will not be available on the site.

B. Electric Power: Government-furnished electricity will not be available at the site.

C. Potable Water: Potable water is not available on the site.

D. Camping: Contractor will be allowed to park a self-contained camper at the site or in a nearby campsite.

PUBLIC PROTECTION

A. When working in an area open to public use, the Contractor shall provide barricades, signs, and other devices as recommended by MUTCD and required in these

Specifications to safeguard the public.

REFERENCED SPECIFICATIONS

A. Referenced specifications such as ASTM, ANSI, etc. shall be for latest edition unless otherwise specified.

EXCAVATION, BACKFILL AND

PRE-CAST CONCRETE VAULT TOILET PLACEMENT

SCOPE OF WORK

A. A. Work specified under this Section includes clearing and grubbing, excavation, backfill, and placement of pre-cast concrete vault toilet, pre-cast sidewalk sections as well as the demolition, removal and backfilling of an existing toilet and vault.

RELATED WORK IN OTHER SECTIONS

A. Pre-cast Concrete Vault Toilet - Section 13122.

B. The accepted quantities will be paid for at the contract unit price for each Pay Item shown in the SCHEDULE OF ITEMS.

PART II - PRODUCTS

BEDDING MATERIAL

A. Toilet Vaults: Sand or 3/8" minus crushed or screened aggregate.

PART III - EXECUTION

LOCATION

A. Toilet location and orientation will be staked in the field by the COR.

CLEARING AND GRUBBING

A. Unless otherwise shown on the drawings, clearing limits shall be 20 feet from the center of the toilet building.

B. Remove all trees and shrubs within the clearing limits. Remove grass, other vegetation, and obstructions interfering with new construction.

C. Protect existing structures and improvements which are to remain in place on adjoining and Government property from damage. Any improvements damaged by the Contractor shall be restored to their original condition or replaced with equivalent new items at the

Contractor's expense.

D. Protect existing trees and other vegetation outside clearing limits against cutting, breaking, skinning, or bruising of roots or bark, piling construction materials within drip line, excess foot or vehicle traffic, parking of vehicles within drip lines, or solvent, paint, oil, or chemical spills onto soil.

EXCAVATION AND ELEVATION

A. Comply with applicable OSHA standards for excavation.

B. Excavate for the installation of the toilet vaults and sidewalks to a depth that will allow the structures to be free-draining after installation is completed. Allow for a 4" leveling course beneath the toilet vault and under the sidewalks. Stockpile topsoil in separate pile at sites where topsoil is present.

C. Finish floor elevation shall be 4-6 inches above natural grade measured at the front

(entrance) of the exterior slab unless otherwise approved by the COR. The

Government may specify a finish floor elevation for buildings at some sites.

Contractor shall install buildings at these sites with the floor elevation within plus or minus 0.05 feet of the specified floor elevation.

D. No excavation shall be left open more than seven days unless otherwise approved by the COR.

E. All excavations left open overnight shall be fenced with wire mesh or plastic mesh fence secured to steel posts all around the excavation.

1. The bottom of the fence shall generally follow the contour of the ground.

2. Maximum spacing of the steel posts shall be ten feet.

3. Minimum height of the fence shall be 36 inches.

BACKFILL AND COMPACTION

A. Compact the natural ground at the bottom of the vault, sidewalk excavation and slab reinstallation with a minimum of three passes with a whacker-type mechanical compactor or equivalent approved by the COR.

B. Install sand, aggregate bedding and gravel material for leveling course. Compact leveling course with one pass with a whacker-type mechanical tamper or equivalent approved by the COR. Grade leveling course so there will be no high spots in middle of vault bottom. Compact with second pass with whacker or approved equivalent tamper.

C. Set vault in place and backfill around structure. Use excavated material for backfill except that rocks larger than six inches in maximum dimension shall not be placed within six inches of exterior of vault walls.

D. Fill, adjacent to the building entry, shall have excavated material placed in eight-inch loose lifts, and compacted with a minimum of two passes with a whacker-type mechanical compactor or equivalent approved by the COR.

E. Set sidewalk sections in place. Backfill along edges.

FINISH GRADING

A. Spread excess excavated material from vault around structure. Intended final grade is flush with the top of the front slab and sidewalk. Allow for placement of topsoil to reach that grade. Grade excess excavated material away from structure at a maximum slope of six percent unless otherwise approved by COR.

B. Spread stockpiled topsoil as final layer after rough grading is completed. Areas disturbed by excavation, backfilling, and stockpiling of excavated materials shall be hand raked to remove exposed rocks over one-inch in maximum dimension. Oversize rocks removed from the surface shall be disposed of within 1 mile of the sites.

PRE-CAST CONCRETE VAULT TOILET

SCOPE

A. This section includes specifications for construction of pre-cast concrete vault toilet buildings and pre-cast sidewalk sections.

B. Toilets shall be the Aspen "All Season" or approved equal. Shop drawings shall be presented to CO for approval prior to fabrication of any components of toilet units.

Contractor shall furnish pre-cast concrete toilets similar in size, shape, composition, and color to units shown on drawings and described in specifications. Any proposed variations from drawings shall be disclosed as provided in Clause 52.236-21, Specifications and Drawings for Construction. Following quantities, hands, colors and signage are required for these buildings:

Qty Ext Finish Hand Sign Roof Notes________________

WHITETAIL TOILET

1 Barnwood Right Unisex Conc Shake Full Screen w/2 sidewalk sections

C. Toilet Exterior colors to be similar to the following: Exterior Walls – Light Brown, color 980; Roof and Trim – Brown, color 978. Colors based on Benjamin Moore color codes for design.

D. Location and orientation shall be coordinated with COR.

RELATED WORK IN OTHER SECTIONS

A. Excavation, Backfill and Pre-cast Concrete Vault Toilet Placement - Section 02222.

TESTING

A. Contractor will be responsible for completing the following tests on concrete. All tests shall be conducted under the direction of a registered engineer or certified testing laboratory. One copy of the results of each test shall be supplied to the COR, either by hand on the same day as the test is taken if the COR is on site or by mail within three days of the test. Sampling shall be in accordance with AASHTO T-141 or ASTM

C172.

1. Slump of Portland Cement Concrete, AASHTO T-119 or ASTM C143: 1 for each truck delivery or batch.

2. Air Content of Freshly Mixed Concrete, AASHTO T-152 or ASTM C231: 1 for each truck delivery or batch.

3. Compressive Strength of Cylindrical Concrete Specimens, AASHTO T-23 and

AASHTO T-22 or ASTM C39: 4 cylinders for each building or 2 cylinders per 20

C.Y. placed, whichever is greater.

SUBMITTALS

A. Submit shop drawings and/or manufacturer's literature for products and methods which differ from those shown on the Plans or in the Specifications to the COR for approval at least 10 days prior to fabrication or ordering. Drawings or literature must be marked to show the exact model, size, etc. the Contractor proposes for use.

B. Submit manufacturer's literature, color chips, etc. of the following to the COR for approval at least 10 days prior to ordering:

1. Door, louvered door vent, and door hardware.

2. Toilet riser, toilet seat and lid, grab bars, and paper holder.

3. Paint, interior and exterior.

4. Caulk, grout, and adhesive.

5. Vault sealer, concrete curing compound, and concrete sealer.

6. Vault exhaust pipe.

7. Foam or neoprene gaskets for vault cleanout access lid.

C. Concrete Mix Design: At least 10 days prior to fabrication, submit concrete mix design with all concrete additives proposed to COR for approval. If concrete supplier, aggregate source, or any additives change at any time, submit a new concrete design to COR for approval.

D. Colored Concrete: Submit one colored concrete sample for each color and texture of exterior building surface, accompanied by manufacturer's literature for color additive, to COR for approval at least 10 days prior to first anticipated colored concrete placement. Colored concrete samples must also be made available to COR when building trim paint chips are submitted for selection. Minimum sample size is

12" x 12" x 1". COR may waive sample requirement if Contractor can show evidence of successful work with same coloring agent and aggregates as proposed for this project. Evidence must be a completed installation accessible to COR or designated representative at least 10 days before first placement of colored concrete is anticipated.

E. Submit one copy of samples and three copies of printed material. One copy of all submittals will be returned to the Contractor.

PART II - PRODUCTS

PRECAST CONCRETE FORMWORK

A. Forms shall be constructed of plywood, lumber, or steel sheets or plates free of defects that could cause blemishes. Forms must be removable without injuring the concrete and must be constructed to maintain close tolerances between mating surfaces of buildings components.

B. Where "barnwood" embossed exterior finish is specified, form liners that will provide a wood-textured appearance shall be used. Symons Corporation's "Random Groved

Barnwood" meets this specification. Other form liners must be equal in quality, provide similar pattern, and have prior approval of COR.

C. Form coating shall be non-staining type that will not leave residual matter on surface of concrete or adversely affect proper bonding of subsequent coatings, caulking, grout, or adhesive applied to concrete surfaces.

1. Where form liner is used, use form release agent or coating as recommended by manufacturer of the form liner.

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

3. Typical acceptable products:

a. Nox-crete form coating - Nox-Crete Company.

b. Arcal - Arcal Chemical Corporation.

c. Synthex - Industrial Synthetics Company.

d. QC Release - Burke Company.

CONCRETE REINFORCEMENT

A. Reinforcing steel shall meet the requirements of ASTM A615, grade 60, and shall be placed at the following minimum spacings:

1. Walls: No. 4 bars 10" on center each way; No. 3 diagonal reinforcing around all openings.

2. Roof: No. 4 bars 10" on center each way; No. 4 diagonal reinforcing around exhaust pipe opening.

3. Floor: No. 5 bars 12" on center each way; No. 5 diagonal reinforcing around all openings.

B. Pre-stress strand, if Contractor elects to use it to facilitate manufacture, shall meet the requirements of ASTM A416 - Grade 270.

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

CONCRETE MIX DESIGN

A. Concrete shall be supplied by a ready-mix or pre-cast concrete products firm regularly engaged in the business.

B. Cement, aggregate, and water shall be proportioned to obtain concrete with good workability.

C. Mix design shall meet ASTM C33 with designated size of coarse aggregate No. 67

(3/4-inch to No. 4), and the following requirements:

1. Minimum cement content: 6.5 sacks per cubic yard.

2. Cement type: ASTM 150 Type II or IIA for building. Type V (sulfate resistant) for vault.

3. Maximum water-cement ratio: 5.0 gallons per sack.

4. Slump: 3 to 5 inches by ASTM C143.

5. Air content: 3.0 to 6.5 percent by ASTM C231.

6. Minimum strength concrete: 4,500 PSI at 28 days.

7. Water shall be potable.

8. Admixtures:

a. Air-entraining, ASTM C260, such as but not limited to "Protex," "Darex,"

"MB-VR," "Castle-VR," or "ADZ-Air."

b. Water reducing agent, ASTM C494, Type A.

c. Use of other admixtures is subject to approval by the COR.

9. Color additives shall be the following, as appropriate to color specified in Section

1.1:

a. For brown integrally colored toilets: Davis Color "Chocolate Brown" #6058 or approved equal.

COLORED CONCRETE

A. The following components shall be pre-cast with colored concrete:

1. Toilet building roof panels.

2. Toilet building wall and screen panels.

CONCRETE SURFACE SEALERS AND CURING COMPOUND

A. Curing compound shall be colorless, complying with ASTM C-309, Type I or 1-D.

B. Interior of vault shall be sealed with black two-component epoxy coating equal to BG-

500 by Rainguard Products Co., Inglewood, CA.

C. Weatherproofing sealer for exterior of building:

1. Clear, non-gloss, colorless silicone based sealer with mineral oil carrier.

2. Products meeting this specification include, but are not limited to: Burke-

United "Clear Proof".

3. Linseed oil shall be applied under silicone sealer on brown integrally colored components only, where such treatment is necessary to prevent brown color from appearing pinkish.

CAULKING, GROUT, ADHESIVE, AND MORTAR

A. Caulking shall remain flexible and non-sag at temperatures from -50o to +140o

Fahrenheit.

1. Exterior, roof peak joint and around exhaust pipe at roof: 100% silicone caulk, clear. GE Silicone II or equal.

2. Exterior joints, including roof/wall and wall panel joints and around exhaust pipe at slab: Siliconized acrylic caulking to match exterior concrete color, or clear. M-D 25 Year Siliconized Acrylic Caulk 14381, 14803, 14423 or equal.

3. Interior joints: Paintable latex caulking. M-D 15 Year Acrylic Latex Caulk

14001 or equal.

4. Toilet riser/floor joint: 100% silicone caulk, clear. GE Silicone II or equal.

B. Grout shall be non-shrink type and shall match color of surrounding concrete as nearly as possible.

C. Epoxy concrete adhesive shall be two component, rigid, nonsag gel adhesive for bonding to dry or damp surfaces, moisture insensitive. Color to match surrounding concrete as nearly as possible.

D. Portland cement mortar shall consist of one part portland cement, three parts sand, and enough water to make a workable mixture.

PAINT

A. Paint and accessory materials shall conform to Federal Specifications or be similar

"top-of-the-line" products of the manufacturers listed below. The Government reserves the right to reject "top-of-the-line" products which, in its opinion, are not comparable to the Federal Specification requirements.

1. Benjamin-Moore and Company.

2. Columbia Paint Company.

B. Products used shall not contain more than 0.06 percent (six hundredths of one percent) by weight of lead.

C. Type of Paints

1. For use on concrete, inside building:

a. Latex block filler primer, Columbia 01-044 or equal.

b. Two component water based epoxy enamel, Benjamin Moore Ironclad

Chemical and Water Resistant Epoxy Enamel 182, Columbia 05-900, or equal.

c. Use epoxy hardener and thinner recommended by paint manufacturer.

2. For use on metal, interior and exterior:

a. Zinc phosphate metal primer, Columbia 04-022 or equal.

b. Alkyd-Oil Based Enamel, semi-gloss, Columbia 03-241 or equal.

D. Color of paints shall be chosen by the COR from the manufacturer's standard shades of the following:

1. Concrete walls, inside building: White.

2. Concrete floor and cove, inside building: Grey.

3. Metal window and door frames, louvered vents, and doors, interior and exterior:

a. For brown buildings: Benjamin color 978 or approved equal.

4. Metal vault access lids and frames, exterior:

a. For brown buildings: Dark Brown.

5. Metal bar-type toilet paper dispensers (unless stainless steel): White.

VAULT TOILET RISER

A. Toilet riser shall be constructed of seamless cross-linked polyethylene, complete with molded plastic heavy duty open-front seat and cover assembly, designed to fit hole in floor slab as shown on the drawings. Color: white or off-white. The seat height of a water closet above the finished floor shall be 17 inches minimum and 19 inches maximum measured to the top of the seat.

1. Part No. OD2020 (HANDICAP) with heavy duty cover as manufactured by

Romtec, Inc., 15587 N. Bank Road, Roseburg, Ore. 97470, 503-496-3541, meets this specification.

GRAB BARS

A. Stainless steel tubing, 1-1/2 inch outside diameter, 18 gauge, Type 304 Stainless Steel with satin finish, 1-1/2 inch wall clearance, 11 gauge Type 304 Stainless Steel concealed screw mounting flanges, equal to Bobrick Series B-6206 or Bradley Series

812. Configuration shall be as shown on the drawings unless otherwise approved by

TOILET PAPER DISPENSER

A. Bar-type toilet paper dispenser shall be constructed of stainless steel with satin finish or steel with glossy white enamel finish, designed to hold three standard rolls of toilet paper. Holder shall not prevent the free turning of the paper rolls. Configuration shall be as shown on the drawings, or alternate if approved by the COR.

STEEL DOORS

A. Doors shall be flush panel type, 1-3/4-inch thick, minimum 16 gauge zinc-coated steel panels, with minimum 18 gauge internal bracing channels, equal to Steelcraft L-16.

Size shall be as shown on Plans.

B. Door frames shall be knockdown or welded type, single rabbet, minimum 16 gauge zinc-coated steel, width to suit wall thickness, equal to Steelcraft. Provide three rubber door silencers on latch side of frame.

C. Door Frame Anchors:

1. Provide three anchors per jamb located approximately at same level as hinge locations.

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

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

D. Door hinges shall consist of 1 1/2 pair wrought steel 4-1/2"x 4-1/2", adjustable tension, automatic-closing spring hinges for each door, US 26D finish.

E. Lockset:

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

2. Lever handles inside and outside.

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

4. Push-button automatically releases 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 handle always active.

7. U.S. 26D finish.

8. Products which meet this specification include, but are not limited to: Schlage

D40S, Olympiad.

F. Door Louver: Louver shall be fixed, inverted split Y, non-vision, 18 gauge galvanized steel with factory prime coat, equal to FDLS series by Anemostat Door Products.

There shall be no insect screen between louvers.

G. Door Stop shall have a cast metal base, U.S. 26D finish, with convex gray rubber 2-

3/8" diameter bumper with a 1" projection, suitable for installation on concrete.

H. Double coat hook shall be constructed of stainless steel and have tamper-proof mounting screws. Upper hook shall extend at least 2 1/2 inches from surface of door.

Lower hook shall extend at least 1 1/4 inches from surface of door. Both hooks shall be curved or angled to hold items securely. Bobrick B-682 or equal.

I. Door sweep shall be provided at bottom of door and shall be an adjustable brush type.

WINDOWS AND VAULT CLEANOUT COVER

A. Window and cleanout cover frames shall be fabricated from steel and configured as shown on the drawings.

B. Window glazing shall be 1/4 inch thick pebble finish colorless LEXAN polycarbonate.

C. Plate for vault cleanout cover lid shall be 1/4 inch thick diamond plate steel configured as shown on the drawings. Cleanout cover lid shall be hinged and configured so that it can be locked with a padlock. A neoprene gasket shall be provided around entire perimeter of lid to provide an air-tight seal

SIGNS

A. Contractor shall provide signs of size, markings, and configuration as shown on the drawings, and of one of the following materials:

1. 1/8 inch thick aluminum with decal symbols. Provide two extra (replacement) decals for each sign.

2. 1/8" thick clear LEXAN polycarbonate plastic, printed on the back side of the sign

B. Color shall be white figure or lettering on colored background. Background color shall be dark brown except that blue background shall be used when trim color is gray.

VAULT EXHAUST PIPE

A. Vault exhaust pipe shall be polyethylene (PE) plastic pipe, 12" nominal size, 12.75" outside diameter, minimum 0.392" wall thickness, 32.5 standard dimensional ration

(SDR), PE 3408 high density, black color, UV stabilized.

1. DRISCOPIPE 1000 by Phillips meets this specification.

PRECAST SIDEWALK SUPPORT CARRIERS AND SECTIONS

A. Provide a minimum of two steel carrier supports to support the sidewalks where they butt up against the toilet entry floor slab.

B. Pre-cast Concrete Sections: Concrete sections to be a minimum of 4” thick and measure approximately 5’0” x 5’0”. Sections shall be cast in such a manner to have a

“tongue and groove” on each section to facilitate sections being joined together.

PART III - EXECUTION

CONCRETE FORMWORK

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

B. Vertical grooves in form liner pattern shall be continuous as shown on elevations except for openings for doors and windows.

1. Horizontal butt joints between form liner panels will not be allowed.

2. Vertical butt joints between form liner panels shall be made at vertical groove in liner pattern except at outside corners.

3. Vertical grooves in form liner pattern shall be arranged so that there is equal space between vertical window or door frame edges and the adjacent vertical grooves at each opening.

C. Form ties will not be allowed in any concrete under this contract.

D. Remove all snow, ice, dirt, sawdust, shavings, or other debris within the forms before placing concrete.

REMOVAL OF FORMS.

A. Contractor shall assume all responsibility for determining when to remove the concrete components from the forms without causing structural damage to the components. Buildings constructed with damaged components will be rejected.

REUSE AND COATING OF FORMS AND FORM LINERS

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

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

CONCRETE REINFORCEMENT

A. Details of reinforcement not shown on the drawings or as herein specified shall be in accordance with ACI 318.

B. Steel reinforcement shall be centered in the cross-sectional area of the walls and shall have at least one inch of concrete cover on the under surface of roof and floor.

Provide diagonal reinforcement at openings.

C. 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 1/2 inch.

D. Use full lengths of reinforcing steel whenever possible and keep the number of splices to a minimum. When splices are necessary on long runs, splices shall be alternated from opposite sides of the component for adjacent steel bars. Lap bars #4 or smaller a minimum of 12 inches. Lap bars larger than #4 a minimum of 24 bar diameters.

E. Bend bars cold unless otherwise approved by the COR. No bars partially embedded in concrete shall be field bent except as shown on the drawings or approved by the

COR.

STRUCTURAL DESIGN

A. Steel reinforcement shown on the drawings is designed to carry live load and dead load anticipated on the structure after the structure is installed at the permanent site.

The Contractor will be responsible for adding reinforcement as needed to facilitate handling, transportation, and assembling the building components without incurring structural damage or cracking of the building components.

COLD WEATHER CONCRETE

A. Cold weather concrete placement shall be in accordance with ACI 306 and as herein specified.

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

C. Materials containing frost or lumps of frozen materials shall not be used.

HOT WEATHER CONCRETE

A. The temperature of the concrete shall not exceed 80oF at time of placement, and when the ambient temperature reaches 90oF, the concrete shall be protected with moist covering or other methods approved by the COR.

MIXING AND DELIVERY OF READY MIX CONCRETE

A. Mixing and delivery shall be accomplished in accordance with ASTM C94, section

10.6 through 10.9 with the following additions:

1. Adjust the quantities of aggregate and water to compensate for differences from the saturated surface-dry condition.

2. Begin discharging concrete within 1 1/2 hours or before 300 revolutions of the drum after introduction of the mixing water to the cement and aggregates, or introduction of the cement to the aggregates. If ambient air temperature is above 80oF, the above limits shall be 1 hour or 200 revolutions.

3. If long hauling distance does not permit meeting the requirements above, add cement and water at the fabrication site.

PLACING AND CONSOLIDATING CONCRETE

A. COR must be given the opportunity to inspect forms after placement of reinforcing steel in forms. Notify COR at least 24 hours before any concrete placement to permit inspection.

B. Avoid segregation. Place in layers not more than 24 inches deep. Do not move concrete with vibrators or tampers.

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

FINISHING CONCRETE

A. Interior Floor, Exterior Slab & Sidewalk Sections: Strike flush to within 1/8-inch variation in 6 feet. Float and trowel slabs smooth until no marks remain. Apply a final light broom finish to exterior slabs and sidewalks sections only.

B. Interior Wall Surfaces, Interior Screen Wall Surfaces, and Ceiling:

1. Finish shall be that provided by smooth steel form, or smooth trowel finish with no trowel marks.

2. All lifting points on screens shall be on panel edges. Plug with bolts or caulking after erection.

C. Wood Textured Surfaces:

1. All exterior building walls and screen exterior walls shall be barnwood texture when barnwood finish is indicated in Section 1.1 B.

2. Finish shall be that provided by approved form liner.

D. Exposed Aggregate Surfaces:

1. All exterior surfaces of concrete roof panels shall have exposed aggregate finish, including underside of overhang. All exterior building walls and screen exterior walls shall be exposed aggregate when exposed aggregate finish is indicated in Section 1.1 B.

2. Exposed aggregate finish shall be accomplished by use of an approved retarder applied to forms or sprayed on concrete surface after placement. Surface shall be removed with stiff fiber or metal brush or washed off with water while concrete is still green. 1/8 to 1/4 inch of cement mortar shall be removed from surface of concrete. Remove any cement film from aggregate surface after concrete has cured. Coarse aggregate should be rounded or subangular with

100 percent passing a 3/4-inch sieve.

E. Cracks and Patching:

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

2. 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 shall match the color, finish, and texture of surrounding surface.

3. Patching will not be allowed on any component with holes, chips, or exposed reinforcement totaling more than 18 cubic inches or with any defects more than

2 inches deep. Those components will be rejected and must be replaced at

Contractor's expense.

CURING AND HARDENING CONCRETE

A. Keep all concrete surfaces wet for at least six days after being placed. Acceptable methods include ponding, wet burlap, curing paper, plastic sheets, and membrane curing compound. Other methods must be approved by the COR.

B. Membrane curing compounds will not be allowed on interior of vault or where curing compound will interfere with penetration or adhesion of final finish.

TESTS AND CERTIFICATION OF CONCRETE

A. A concrete batch certificate containing all items shown on the example at the end of this section shall be completed and furnished to the COR for each load or batch of concrete. Certification forms will be supplied by the Government or the Contractor may provide suitable forms.

B. Contractor is responsible for testing and reporting results of tests as specified in

Section 1.3.

C. Additional tests may be run by the COR, a designated representative, or a testing firm and will be the responsibility of the Government.

D. Contractor shall provide at least 24 hours notice to the COR prior to placing of any concrete so test arrangements may be made.

COLORED CONCRETE

A. The following concrete components shall be integrally colored:

1. Toilet building roof.

2. Toilet building exterior walls.

3. Toilet entrance screen.

B. The same type and brand of cement, coloring agent, aggregates, and other additives shall be used throughout. In addition, as far as is reasonably practicable, all ingredients shall be from the same lot or manufacturing process. Aggregates shall be from the same source.

C. All volumes of concrete shall be uniform in all respects to ensure consistency of the color of the finished concrete. All ingredients shall be weighed. Add color by weight as recommended by the manufacturer of the concrete color. The mixing operation shall be adequate to uniformly disperse the color throughout each batch.

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

STRUCTURAL JOINTS

A. Joining details other than those detailed below will not be allowed unless approved by the COR prior to manufacture of buildings.

B. Wall components shall be joined together with epoxy concrete adhesive and two weld plate pairs at each joint. Each weld plate shall be 12 inches long and located one pair in the top quarter and one pair in the bottom quarter of the seam. Weld plates shall be anchored into concrete panels and welded together with a continuous weld. Adhesive shall be applied for the entire length of the seam. Seal inside seams with paintable latex acrylic caulk. Seal outside seams with caulk to match building color, or clear.

C. Walls and roof shall be joined with weld plates, minimum 2 1/2" x 5" at each building corner. Where the COR determines that the joint between walls and roof is true enough to prevent point loadings on the walls, the joint between walls and roof shall be sealed gas-tight with silicone caulk. Where the joint between the walls and roof is not true enough to prevent point loading, the joint shall be grouted with approved rigid non-shrinking grout that distributes the weight of the roof evenly around the perimeter of the building walls.

D. The joint between the floor slab and walls shall be joined together with epoxy concrete adhesive 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. Each weld plate shall be 12 inches long. Weld plates shall be anchored into concrete panels and welded together with a continuous weld. Adhesive shall be applied for the entire length of the seam. Grout formed keyway to provide smooth cove between walls and floor.

E. The joint between building and vault shall be sealed gas-tight with silicone caulk or flexible joint sealant such as neoprene rubber, Ram-Nek, or other sealant approved by

PAINTING

A. Apply materials in strict accordance with manufacturer's recommendations.

B. Examine work to ensure all surfaces are properly prepared to receive finish.

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

2. If needed to insure uniform application, prepare concrete surface for application of paints by acid etching with a 30 percent solution of hydrochloric acid. Flush with water and allow to thoroughly dry.

C. Furnish and lay drop-cloths in all areas where painting is being done to protect floors and other work from damage.

D. Painting shall NOT be done under the following conditions:

1. Outside in cold, frosty, foggy, or damp weather.

2. In winter, unless temperature is 50oF or over and surfaces are dry and hard.

3. In dusty areas.

E. Apply coats, additional to those shown in the Schedule of Finishes, when undercoats or other conditions show through final coat of paint, until paint film is of uniform finish, color, and appearance.

F. Gray concrete enamel on floor shall also cover the cove at the junction between wall and floor. The line between the gray floor enamel and the white wall enamel shall be straight and parallel to the floor.

G. Schedule of Finishes:

1. Metalwork: Steel doors, door vents and frames, window frames, vault access lids and frames, and roof posts:

a. One coat metal primer.

b. Two coats alkyd oil enamel in color specified elsewhere.

2. Interior Concrete Surfaces:

a. Walls and ceiling of building: 1 coat latex block filler and minimum 2 coats of two-component water-based epoxy paint.

b. Interior floor: Primer coat of thinned two-component epoxy and minimum 2 coats of two-component epoxy paint.

3. Exterior Slab: 1 coat of clear penetrating sealer.

4. Interior Surfaces of Toilet Vault:

a. Apply coating to the inside walls and bottom of vault in accordance with manufacturer's recommendations.

b. Concrete surfaces shall be acid etched prior to application of coating.

c. Apply coating at a rate of 75 sq. ft. per gallon per coat (16 mils per coat). Apply two coats.

5. Exterior surfaces of building walls, roof, and screens that will not be painted: 2 coats silicone sealer. For brown buildings, linseed oil shall be applied and allowed to air cure before applying sealer.

a. Seal colored concrete as recommended by the manufacturer of the concrete color, if different from above.

H. Cleanup: Repair all defects and remove all paint spatters, etc.

I. Protect interior painted surfaces from direct exposure to sunlight and weather during manufacture, assembly, and installation.

VAULT TOILET RISER AND ACCESSORIES

A. Set riser in pre-cast hole in floor slab. Place silicone caulk between toilet riser flange and concrete floor as shown on the drawings. Smooth all caulk joints into a concave surface with finger or tool.

B. Attach grab bars and toilet paper holder to walls in locations shown on drawings.

Fastening system must be able to withstand 300 pound loading of each grab bar and on top of toilet paper holder.

METAL DOORS AND FRAMES

A. Install steel door and frame in accordance with drawings and manufacturer's recommendations. Fit door accurately in frame. Mount louvers on door with cadmium- or zinc-plated corrosion resistant Phillips head metal screws.

B. Install hardware in accordance with hardware manufacturer's instructions after finish paint work is completed. Install sweep on bottom of door and adjust so it contacts the floor when door is closed. Install coat hook 48" to 54" above the floor. Install door bumper on vestibule wall to meet door handle.

C. Adjust hinge tension after building is installed so that the maximum force necessary for pushing or pulling the door open is five pounds and the door takes at least three seconds to move from 70 degrees open to within three inches of the latch. Verify smooth operation of door and hardware. Adjust as necessary to provide smooth operation and required hinge tension.

WINDOWS AND VAULT CLEANOUT COVER

A. Install windows and vault cleanout cover as shown on the drawings.

B. After paint on frame and lid has completely cured, install neoprene gasket seal around perimeter of cleanout cover lid to assure gas-tight seal when lid is locked in place. Do not stretch seal material during application. Damaged, degraded, or non-air tight seals are not acceptable and must be replaced at the Contractor's expense.

SIGNS

A. Install signs in cast-in recesses on toilet building walls as shown on the drawings, using tamper-proof masonry anchors at each corner.

EXHAUST PIPE INSTALLATION

A. Install exhaust pipe through roof, and seat in tapered hole in slab. Seal around pipe at top of roof with silicone caulk. Seal around pipe at top of slab using backer rod and silicone caulk.

PRE-CAST CONCRETE SIDEWALK SECTIONS

A. Install pre-cast sidewalk sections on a gravel bed at toilet.

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