Attachment 5 - Coyote Meadows TH SOW Revised.pdf

CARIBOU-TARGHEE NATIONAL FOREST/Intermountain Region/Purchase, delivery, and installation of single vault toilet at Coyote Meadows Trailhead, Ashton, ID

Specification Sheet

Precast, single vault toilet for Coyote Meadows Trailhead Quantity: 1

USDA FOREST SERVICE, R-4

Coyote Meadows Trailhead Vault Toilet CTNF

SECTION 133401 - PRECAST CONCRETE VAULT RESTROOM BUILDING

PART 1 - GENERAL

1.1 SUMMARY

A. This section applies to the fabrication, delivery, and placement of a precast concrete Vault Restroom building, including shipment to site, all work necessary to completely fabricate, and installation of other manufactured accessories needed or specified in this section for a complete Vault Restroom. The Contractor shall be responsible for setting the toilet on a prepared hole which will be excavated and backfilled by the Forest Service.

B. SITE LOCATION: Coyote Meadows Trailhead located at Latitude: 43.99771589

Longitude: -111.0052316

C. Precast Vault Restroom Buildings (Manufacturer to verify requirements with Contracting Officer prior to constructing):

1.2 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 four sets of shop drawings of the Vault Restroom stamped by a Professional Engineer.

C. Color Sample: Sample of concrete color for walls and roof 12”x12”.

D. Design Calculations: Submit two sets of design calculations showing that the building is designed for the structural loads required, fabrication and transportation loads, and crack prevention and control.

E. Concrete Delivery Certificates: Supplier shall 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.

1.3 MEASUREMENT AND PAYMENT

A. Payment will be lump sum for each Pre-cast Concrete Vault Restroom installed including all work within 10 feet of the buildings as shown on the drawings.

PART 2 - PRODUCTS

2.1 PRECAST VAULT RESTROOM

A. Vault restroom shall be Single Unit vault with Screen. Basis of Design unit is Model “Aspen” by

BC Concrete (Missoula Concrete) or an approved equal.

1. Manufacturers of precast concrete Vault Restrooms include, but are not limited to, the following:

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

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

B. Design criteria (minimum)

1. Snow Load: 250 lbs/ft2

2. Wind Load: 120 mph, or 180 mph (3 second-gust) exposure C from 2015

International Building Code

3. Seismic Load: Category D, SS=0.717, S1=0.22 from 2015 International Building

Code

4. Designed to meet the requirements of the Americans with Disabilities Act

Requirements and Uniform Federal Accessibility Standard including as of the date of these specifications.

5. 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)

6. Tolerances will be within the limits as dictated by the PCI Quality Control and

Assurance Manual

2.2 BUILDING WALLS AND SLAB

A. Floor Slab: 5-inch minimum thickness or approved based on design calculation.

B. Walls: 4-inch average thickness, 3-inch minimum wall thickness at the top of the walls or approved based on design calculation..

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C. Roof: 4 ¼ inch minimum concrete thickness or approved based on design calculation.

2.3 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.

2.4 WALL VENTS

A. Wall vents: Airolite No. 609B, size shown on the drawings, The Airolite Co., Marietta, OH, www.airolite.com; or HEAVY DUTY KICK PROOF VENT by Romtec, Roseburg, OR.; or an approved equal. Only one vent per toilet room should be installed – see schedule at end of this section.

2.5 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 3:12 pitch desired

2.6 VENT STACK

A. Vent Stack: shall be a minimum 12 inch diameter HDPE (with a minimum DR of 32.5) and extend from the vault to a minimum of 3 feet higher than the roof peak. Vent Stack shall be black.

2.7 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. FINISHING CONCRETE

1. Interior Floor: will be floated and troweled until all marks are removed. A light broom finish will be applied to interior slabs for a non-slip finish.

2. Exterior Slabs: will be floated and troweled until all marks are removed. A light broom finish will be applied to the exterior and interior slabs for a non-slip finish.

3. Exterior Walls and Screens: Wood-textured appearance, Symons Corporation’s

“Random Barnwood,” or an approved equal.

4. Roof: Simulated Wood Shake appearance or approved equal. Underside of overhangs will have a smooth finish.

C. FORM COATING: 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.

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

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

2. Vault:

A. Provide one sealed concrete vault area per toilet riser.

Each concrete vault shall hold a minimum capacity of 1,000 gallons of waste.

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

C. Vault Liner: Vault shall include a one-piece molded polyethylene (LDPE) liner with a minimum thickness of 0.10 inch and lip over top of vault. Liner shall be secured to sides of vault interior so that there are no voids between liner and sides of vault.

2.8 CONCRETE REINFORCEMENT

A. Reinforcing steel: ASTM A615, Grade 60. All welded wire fabric will conform to ASTM A185.

B. Pre-stress strand (if used): 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.

D. Steel reinforcement will be centered in the cross-sectional area of the walls and will have at least

1" of cover on the under surface of the floor and roof.

E. The maximum allowable variation for center-center spacing of reinforcing steel will be 1/2".

F. Full lengths of reinforcing steel will be used when possible.

G. Reinforcing bars will be bent cold.

H. Diagonal reinforcement will be placed around all openings.

2.9 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

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

2. Minimum cement content: 6.5 sacks per yd3

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

4. Maximum water-cement ratio: 0.40

5. Slump: 3 to 5 inches by ASTM C143

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

7. Minimum strength concrete: 4,500 psi at 28 days 8. Water: Potable 9.

Admixtures:

a. Air-entraining agent: ASTM C260

b. Water reducing agent: ASTM C494, Type A

c. 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 shall contain colored concrete:

1. Building roof panels

2. Building wall panels

3. Building screen walls

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: match building panel color

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

2.12 CAULKING, GROUT, ADHESIVE, AND MORTAR

A. Caulking shall 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 or approved equal.

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

2. Columbia Paint Company, www.columbiapaint.com

3. Rust-Oleum

4. Rodda Master Painter, www.roddapaint.com http://www.benjaminmoore.com/ http://www.benjaminmoore.com/ https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.columbiapaint.com%2F&data=02%7C01%7C%7Cef0bf982014f42adbef208d7ebb099c9%7Ced5b36e701ee4ebc867ee03cfa0d4697%7C0%7C0%7C637237016035025333&sdata=OxrwOJ65mM4Hc4dc1CabGgo9vrTfKbcKzAch4n9PiFg%3D&reserved=0 https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.columbiapaint.com%2F&data=02%7C01%7C%7Cef0bf982014f42adbef208d7ebb099c9%7Ced5b36e701ee4ebc867ee03cfa0d4697%7C0%7C0%7C637237016035025333&sdata=OxrwOJ65mM4Hc4dc1CabGgo9vrTfKbcKzAch4n9PiFg%3D&reserved=0 https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.roddapaint.com%2F&data=02%7C01%7C%7Cef0bf982014f42adbef208d7ebb099c9%7Ced5b36e701ee4ebc867ee03cfa0d4697%7C0%7C0%7C637237016035025333&sdata=OdKzuGi6WcrJUTsdJ15PbtUzTYukoazvn1MhnimybXk%3D&reserved=0 https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.roddapaint.com%2F&data=02%7C01%7C%7Cef0bf982014f42adbef208d7ebb099c9%7Ced5b36e701ee4ebc867ee03cfa0d4697%7C0%7C0%7C637237016035025333&sdata=OdKzuGi6WcrJUTsdJ15PbtUzTYukoazvn1MhnimybXk%3D&reserved=0

B. Maximum lead content: 0.06 % by weight of lead.

C. Type of Paint

1. Metal, interior and exterior

a. Waterborne acrylic bonding primer or an approved equal.

b. All-purpose gloss equipment enamel, Rodda Industrial Protective Coatings, Professional Maintenance, Neutral Base 75 8104 1, or

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

2. Exterior Concrete

a. Exterior slab - will be clear sealer anti-graffiti.

b. Exterior walls & roof - will be Rodda AC-Exterior Series, Neutral Base 51

1104 5, 911 Velvet Flat Latex Color: as approve – or Stain- pure acrylic water repellent penetrating stain

3. Interior Concrete

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

b. Interior walls and ceiling- modified acrylic, penetrating pigment followed by a clear acrylic anti-graffiti sealer. Or semi-gloss, Rodda Master Painter, White

Base 54 3101 5. Color: White

D. Paint colors – or approved equal

1. Metal window and door frames, louvered vents, and doors (interior and exterior):

Medium Brown

2. Exterior concrete walls and floor: Medium Brown

3. Exterior concrete roof: Gray

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 approved.

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.

1. Three (3) rubber door silencers shall 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 shall be 4 ½ inch spring hinges

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

3. Top and bottom hinge shall have an adjustable tension spring and be adjusted to a

5 lb. maximum pull.

4. Finish shall be US26D (dull chrome)

E. Deadbolt shall be Mortised type, operated by key from outside only, which will receive the Forest

Service cylinder; similar and equal to Yale 1152. Finish shall be US26D (dull chrome).

F. Lockset will meet ANSI AI 56.2 Series 4000, Grade 1 cylindrical lockset for exterior doors. Lever handle both inside and out. Either handle operates latch unless outside handle is locked by inside push-button. Push-button will automatically release when inside lever handle is turned or door is closed. Emergency slot on exterior so door can be unlocked from the outside with a coin, screwdriver, etc. Inside lever always active. Finish shall be US26D finish.

G. Door Louver (if specified) shall 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 shall be no insect screen between louvers. H. Door sweep shall be an adjustable brush type placed at bottom of door.

H. Door stop shall be a cast metal base, US26D (dull chrome) finish with gray rubber 2 3/8 inch diameter bumper with a 1 inch projection

2.15 INTERIOR HARDWARE

A. Grab Bars: Grab bars shall 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 shall 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 standards. Apply Butyl rubber adhesive sealant to the top surface of the concrete vault before placing the structure on the vault.

http://www.anemostatwest.com/ http://www.anemostatwest.com/

2.16 SIGNS

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

2.17 WINDOWS

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

B. Window glazing shall be translucent pebble finished mar-resistant Lexan polycarbonate.

Minimum thickness of ¼ inch.

2.18 VAULT CLEANOUT

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

B. Cover/Lid: shall be constructed of minimum ¼ inch steel. Shall be hinged to the steel frame.

Designed to drain surface water runoff away from building and from entering vault. Configured with a locking mechanism that will receive a government furnished padlock.

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

PART 3 - EXECUTION

3.1 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 shall 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 shall be made at vertical groove in liner pattern except at outside corners.

c. Vertical grooves in form liner pattern shall 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 shall 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 shall be lapped a minimum of 12 inches;

b. Larger than No. 4 shall 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 lumps of frozen.

D. Hot Weather Concrete

1. The temperature of the concrete shall not exceed 80°F at the time of placement, and when the ambient temperature reaches 90°F, the concrete shall 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. Finishes shall be as noted previously.

2. Cracks and Patching

a. 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 will affect the serviceability or structural integrity of the component.

b. Fill small holes, depressions, and air or rock pockets in all surfaces with nonshrinking 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.

c. Patching will not be allowed on any component with holes, chips, or exposed reinforcement totaling more than 18 in3 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 2-1/2” x 5”, at each building corner.

a. 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.

b. 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.

c. 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: 5 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 shall 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 enamel. Color: Medium Brown

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

1) Exterior Slab: Two coats clear sealer

2) Exterior Walls & Roof: Integral coloring. If stained enhanced exterior walls are called for, then one coat of pure acrylic water repellent penetration stain in the same color as the walls or roof followed by 1 coat of clear acrylic sealer.

c. Interior Concrete Surfaces

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

2) Interior floor: Two coats of epoxy with a silica sand suspension. L.

Metal Doors And Frames

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

a. Fit door accurately in frame

b. Mount louvers on door (if specified) 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.

M. Concrete Testing

1. The following tests will be performed on concrete used in the manufacture of toilets.

Testing will only be performed by qualified individuals who have been certified

ACI Technician Grade 1. Sampling will be in accordance with ASTM C172.

a. The slump of the concrete will be performed on the first batch of concrete in accordance with ASTM C143. This slump will be in the 3"-5" range.

b. The air content of the concrete will be checked per ASTM C231 on the first batch of concrete. The air content will be in the range of 4%-6%.

c. The compressive strength of the cylinders will be tested to ASTM C39.

d. Test cylinders will be taken from each other batch.

1) one cylinder will be tested prior to removal of forms and must be at

2,500 psi or higher.

2) one cylinder represents 7-day strength

3) two cylinders will represent 28-day strength and must be 4,500 psi or greater.

END OF SECTION 133401

April 2019