SOW_Vault_Toilets.pdf

STATEMENT OF WORK

PROVIDE PRECAST CONCRETE DOUBLE VAULT RESTROOMS

CAPE COD NATIONAL SEASHORE

THREE LOCATIONS

STATEMENT OF WORK

1.0 Background

The following government properties require double vault restroom: 1. At Beech Forest Trail head, provide new vault toilets; 2. At Herring Cove, South Parking, replace the existing vault privy shall; and 3.

The great island trail head, provide new vault toilets.

The Contractor shall provide new double vault restroom systems at each location. The system shall be precast concrete transportable building with vaults and rated Marine Grade. The system shall be delivered and installed in accordance with this statement of work. The Double Vault Restroom system shall be provided by manufacturer with all necessary openings, windows, doors, door hardware, door closer, hatches, hatch hardware, vents, venter screens, toilets, hinged toilet seats, grab bars, toilet paper dispenser and waterless hand dispenser. The restroom shall provide a complete and modular double vault restrooms consisting of two (2) ADA compliant restrooms and utility room. Each restroom shall have a dedicated 1000-gallon vault/tight tank that is located below the restroom and will provide a tight tank for the waste. The system shall meet American with disability act requirements, international building code requirements, state of Massachusetts building codes, state of Massachusetts environmental regulations and this statement of work.

Vault Restrooms require a permit and approval under Massachusetts 310 CMR 15.000: The State Environmental Code, Title 5. The contractor shall apply for and receive all required permits and shall provide all required inspections to complete the work.

Cape Cod Massachusetts is in an environmentally sensitive area. The unique soil and hydrological conditions for most land parcels make it challenging for sanitary, environmentally safe wastewater disposal and the services necessary to provide these systems. The predominantly sandy soil throughout the project area allows wastewater to migrate rapidly from individual sewage disposal systems to nearby surface waters, well sites, and estuaries leading into our marine waters.

2.0 Scope

The Contractor shall provide all supervision, equipment, transportation, storage, labor, material, and plant to prepare each location for the new double vault restroom and provide (furnish and install) the new double vault restroom at each location. The Herring Cove location has an existing double vault restroom. The contractor shall secure the existing restrooms, pump and properly dispose of the tank contents. Once the permit for removal and replacement is approved, the existing vaults, restrooms, appurtenances and concrete apron shall be removed and properly disposed. The site shall be prepared for the new double vault restroom. Provide new vault and restroom, backfill, finish disturbed site and provide concrete apron with ramp. New floor elevation shall be 18 inches above the existing grade.

At the Beech Forest site, secure the work area. Clear and grub area to allow excavation and site preparation for the new double vault restroom. Once the permit for the new double vault restroom is approved, excavate site and provide one new double vault restroom. Backfill and finish disturbed site.

At the Great Island site, secure the work area. Clear and grub area to allow excavation and site preparation for the new double vault restroom. Once the permit for the new double vault restroom is approved, excavate site and provide one new double vault restroom. Backfill and finish disturbed site.

The work areas are adjacent to trail heads and public parking areas. The contractor shall secure each work area with a six (6) foot high, temporary construction fence with locked gates.

At each location, the contractor shall provide 200 square feet of 5-inch-thick concrete apron for each new double vault restroom. Concrete shall be 4000psi, air entrained with pea stone aggregate.

Reinforce apron and walkway with 6x6, 8-gauge welded wire mesh. Line concrete at 5-foot intervals.

Provide 4-inch x 0.5 inch, closed cell foam expansion joints where concrete apron abuts the structure and intervals not exceed 15 feet. The concrete shall be broomed concrete finish, lined and edged smooth. Provide concrete ramped access as part of the concrete apron.

3.0 Safety and Environmental Protection Requirements

The Contractor shall contact Dig Safe prior to any ground disturbance.

The contractor shall provide its Construction Safety and Health plan prior to the start of work. The plan shall include the job safety and hazard analysis for the project trenching, excavation, hoisting/rigging, life safety and moving equipment prior to the start of work. Provide in accordance with OSHA requirements and guidelines.

The contractor shall identify its project competent person and each qualified person. Submit competent person resume complete with a copy of the OSHA 30 card and specialize formal training in the high hazard work operations (trenching, excavation, hoisting/rigging, life safety and moving equipment). All other contractor employees/workers shall have the OSAH 10-Hour Construction Safety course and necessary safety trading to be able to identify hazards within their work environment.

Visitors utilize the parking lot, paths, walkway and areas adjacent to the construction area. Area shall be protected from unauthorized access with a temporary 6 foot high, chain link construction fence and locked gates.

A one-week written notice is required prior to closing or disrupting the adjoining park areas.

The contractor shall clearly mark and delineate the limits of work activities, access routes, staging areas for approval prior to starting any on-site activities. Equipment shall not be allowed to operate outside the limits of work or to disturb existing vegetation.

The Contractor shall maintain project in neat, orderly and safe condition at all times. Contractor shall provide containers for collection and disposal of waste and trash resulting from work. Contractor shall keep dust and dirt pollution to a minimum.

During the execution of this contract, the Contractor shall conform to the rules and regulations as set forth by the Occupational Safety and Health Administration’s Safety and Health Standards. The contractor shall provide barriers, temporary fencing, signage, etc. wherever work could cause injury to workers or visitors.

The Contractor shall provide and maintain environmental protection during the life of the Contract to control pollution or to correct conditions that develop during construction. Comply with government-furnished permits, and all Federal, State, and local laws and regulations pertaining to water, air, soil, and noise pollution.

Construction equipment is to be kept in good repair, without leaks of hydraulic or lubricating fluids.

Contractor must visually inspect all equipment prior to commencing work every day and at the mid-point in the workday for leaks. If such leaks or drips do occur, they shall be cleaned up immediately.

Drip pans shall be utilized when vehicles are parked. Confine equipment maintenance to one location.

Control runoff in this area to prevent contamination of soils and water. No equipment repair will be allowed on the site.

It is the contractor’s responsibility to ensure that any disturbance or damage done during the course of this project to the existing utilities, landscape, building or government materials, shall be repaired or restored to its original condition by the contractor at contractor’s expense prior to completion of the job. Restore all disturbed areas, repairing or replacing damaged plants, grasses, and other vegetation, at no additional expense to the Government, to pre-project conditions. Provide temporary barriers to protect existing vegetation

Contractor shall provide its temporary water and electric power as necessary for the duration of the project. Utilities are not available at the project sites.

The Contractor shall be responsible for storage of all materials and equipment; the Park Project Inspector or COR must approve contractor’s use of any space on the site in advance.

All debris cleared and not scheduled to be reinstalled are the property of the contractor and are to be recycled or legally disposed of offsite in a manner that is consistent with local and state regulations.

The contractor shall provide all siltation control devices such as silt fence, compost tube filers, hay bale sediment control devices, etc. required for the settling or filtering of fine sands and silt resulting from rainfall runoff or dewatering operations. Protect all natural or man-made watercourse of drains to ensure that the construction activities do not interfere with or adversely impact the hydraulic characteristic.

Once each double vault restroom is set in place, the contractor shall fill and back fill the disturbed area using the material removed during excavation. Deleterious materials removed during excavation shall be removed from the site.

No work shall take place on holidays or weekends. All work areas shall be secured and safe on weekends and holidays.

Upon satisfactory completion of the work, contractor shall provide the park with certified as-built drawings of the work, all material submittals and 8-½” x 11 sheet of paper with directions on how to find covers, lids, etc.

4.0 Regulations

The double vault restroom pumping, excavation, clearing, grubbing, demolition, access work, and installation of the new double vault restrooms shall conform to all applicable State and Local codes and shall be provided in a neat and workmanlike manner, in accordance with the best practice of the trade.

Requirements of the following organizations shall be considered minimum:

1. Massachusetts State Building Code (780 CMR) 9th Edition

2. Massachusetts Department of Environmental Protection and 310 CMR 15

3. Massachusetts Uniform State Plumbing Code 248 CMR 10.0

4. Massachusetts State Electric Code 527 CMR 12.0

5. Massachusetts State Building Code 780 CMR 10th edition

6. Massachusetts Wetland Protections Act, 310 CMR 10.00

7. Cape Cod 208 Cape Wide water quality plan-latest edition

8. Massachusetts Department of Environmental Protection Requirements

9. Occupational Safety and Health Administration (OSHA)

10. National Institute for Occupational Safety and Health (NIOSH)

11. American Society Testing Material (ASTM) C478 and joint materials

12. American Society Testing Material (ASTM) C923, “Standard Specification for Resilient

Connectors Between Reinforced Concrete Manhole Structures, Pipes, and Laterals”

13. American Society Testing Material (ASTM) C443, “Standard Specification for Joints for Concrete

Pipe and Manholes, Using Rubber Gaskets”

14. American Society Testing Material (ASTM) C990, “Standard Specification for Joints for Concrete

Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants” (Butyl rubber gaskets are commonly used in the industry)

15. American Society Testing Material (ASTM) C1244 standards for negative pressure tests for manholes

16. American Society Testing Material (ASTM) A48 Standard Specification for Gray Iron Castings

17. ASTM C1059 Standard Specification for Latex Agents for Bonding Fresh to Hardened Concrete

18. ASTM C 270 Property Specifications - Masonry Cement and Sand Mortar

19. ASTM C1714 Preblended Dry Mortar Mix

20. ASTM C33 Concrete Aggregates

21. ASTM C39 Method of Test for Compressive Strength of Cylindrical Concrete Specimens

22. ASTM C94 Standard Specification for Ready-Mixed Concrete

23. ASTM C143 Method of Test for Slump of Concrete

24. ASTM C150 Standard Specification for Portland Cement

25. ASTM C172 Standard Practice for Sampling Freshly Mixed Concrete

26. ASTM A185 Standard Specification for Steel Welded Wire Reinforcement, Plain, or Concrete

27. ASTM C192 Method of Making and Curing Test Specimens in the Laboratory

28. ASTM C231 Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

29. ASTM C309 Standard Specifications for Liquid Membrane-Forming Compounds for Curing Concrete

30. ASTM C494 Standard Specification for Chemical Admixtures for Concrete

31. ASTM A615 Standard Specification for Deformed and Plain Carbon-Steel bars for Concrete

Reinforcement

32. ASTM C618 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

33. ASTM C979 Standard Specification for Pigments for Integrally Colored Concrete

34. ASTM D1557 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using

Modified Effort

35. ACI 211.1 Standard Practice for Selecting Proportions for Normal, Heavyweight, and Mass

Concrete

36. ACI 306 Cold Weather Concreting

37. ACI 318 Building Code Requirements Structural Concrete and Commentary (includes Errata)

38. PCI MNL 116 Quality Control for Plants and Production of Precast Prestressed Concrete Products

39. AWS D1.1 Structural Welding Code

40. ICC/ANSI/BHMA standard A117.1 Standard for Accessible and Usable Building and Facilities

41. ANSI/BHMA A156.4, Grade 1-door Closers

42. International Building Code (IBC) 2021

5.0 Design Criteria

New double vault restroom shall meet the following criteria. Calculations and engineered stamped drawings shall be provided. Building shall be manufactured using precast concrete including the roof. Building’s structural and foundation design shall be relevant to the region and properties associated with its final placement. Design shall meet all applicable accessibility, International building code and Massachusetts State Building Code requirements. Vault buildings also to meet various structural loads such as below but not limited to/or restricted by them.

A. Group U occupancy

B. Roof Snow Load

1. Vault buildings are designed to withstand a 100 pounds per square foot snow load.

C. Floor Load

1. Vault buildings are designed to withstand 100 pounds per square foot floor load.

D. Wind Load

1. Vault buildings will withstand the effects of 130 miles per hour (3-second gust) wind exposure C.

E. Earthquake

1. Zone 2

F. Sweet Smelling Technology (SST)

1. Vault buildings incorporate design aspects of SST as outlined by Briar Cook for the U.S. Forest Service.

2. All wall to floor interior surface seams shall have a minimum 1” radius coving made of high strength grout.

3. The vault shall have a bottom slope of 1” per foot from under the toilet riser out to the outside cleanout area.

4. Each vault shall have a 24” diameter (minimum) lightweight manhole cover installed to the rear or side of the building. Cover shall be hinged and provided with a padlock hasp.

a. The manhole cover should be raised, with the surrounding concrete sloped away using a minimum slope of ½” per foot.

5. The depth of the vault shall be no deeper than 4½ feet to 5 feet.

6. A 12” diameter round pipe will be installed to vent the vault and the pipe shall be raised a minimum of 3’ above the highest point of the roof.

a. Vent pipe shall be straight up from the vault.

b. Vent pipe shall include a bird and insect screen.

c. Vent pipe shall include a rain cap.

7. Each restroom shall have one vent and one vault.

F. Additional Design Standards

1. Double vault restroom are an all-concrete design with a minimum 7/12 roof pitch.

2. Double Vault restroom shall have a minimum 4” wall, 4½” roof, and 5” floor thickness.

3. Double Vault restroom shall have a one-piece floor unit to prevent panels that migrate in different directions during periods of freeze/thaw stress.

4. Double vault restroom shall have two (2) one-piece full length and width vault unit to support the building, screen area, and snow loads evenly.

6.0 Vault and Restroom Materials

A. Concrete – General

1. The concrete mix design is designed to ACI 211.1.

2. Concrete will contain a minimum of 675 pounds of cementitious material per yard. Cement is a low alkali type I/II or III conforming to ASTM C-150.

3. Coarse aggregates used in the concrete mix design will conform to ASTM C33 with the designated size of coarse aggregate #67.

4. Maximum water/cement ratio will not exceed .45.

5. Air-entraining admixtures will conform to ASTM C260. Water reducing admixtures will conform to ASTM C494, Type A.

6. If Self Compacting Concrete (SCC) is used, it must conform to ASTM C1611.

B. Concrete – Cold Weather 1. Cold weather concrete placement is in accordance with ACI 306.

2. Concrete will not be placed if ambient temperature is expected to be below 35ºF during the curing period unless heat is readily available to maintain the temperature of the concrete at least 50ºF.

3. Materials containing frost or lumps of frozen materials will not be used.

C. Concrete – Hot Weather 1. The temperature of the concrete will not exceed 90ºF at the time of placement. When the ambient reaches 90ºF the concrete is protected with moist covering.

D. Concrete Reinforcement 1. All reinforcing steel will conform to ASTM A615. All welded wire fabric will conform to ASTM A185.

2. All reinforcement is new, free of dirt, oil, paint, grease, loose mill scale and loose or thick rust when placed.

3. Details not shown on drawings or specified are to ACI318.

4. Steel reinforcement is centered in the cross-sectional area of the walls and will have at least 1¼” of cover on the under surface of the floor.

5. The maximum allowable variation for center-center spacing of reinforcing steel is ½”.

6. Full lengths of reinforcing steel are used when possible. When splices are necessary on long runs, splices are alternated from opposite sides of the components for adjacent steel bars.

7. Lap bars under #4 a minimum of 12” bar diameters.

8. Lap bars larger than #4 a minimum of 24” bar diameters.

9. Reinforcing bars are bent cold. No bars partially embedded in concrete are field bent unless approved by the contracting officer.

E. Caulking, Grout, Adhesive and Sealer

1. Caulking service temperatures from -40ºF to +194ºF.

2. Interior and exterior joints are caulked with a paintable polyurethane sealant.

3. Grout is a non-shrink type and are painted to match the color of surrounding concrete as nearly as possible.

4. Cement base coating is formulated with a very fine aggregate system and is a built-in bonding agent.

F. Dead Bolt

1. Certified ANSI/BHMA A156.5-2001 Grade 1.

2. Heavy duty tamper resistant.

3. 2¾” backset.

4. U.S. 26D finish.

G. Doors – Steel

1. Doors are flush panel type 1¾” thick, minimum 16-gauge galvanized steel, top painted with Direct to Metal (DTM) ALKYD.

2. Door frames are knockdown or welded type, single rabbet, minimum 16-gauge prime coated steel top painted with DTM ALKYD, width to suit wall thickness.

3. Block each frame and door for door closer

4. Three (3) rubber door silencers are provided on latch side of frame.

5. Provide adjustable brush type door sweep at the bottom of door.

H. Door Hinges

1. Three (3) per door. Hinges heavy duty with dull chrome plating 4½” x 4½”.

I. Doorstop

1. Dome style stop meeting ANSI 156.16.

J. Door Closer with hold open feature

1. Provide heavy duty, stainless steel, mechanic door closer with hold open feature.

K. Double Coat Hook

1. 16-gauge (1.5mm), type 304 stainless steel.

2. Formed construction with a satin finish and have ³̷₁₆” x ⅞” nail in anchor.

3. Upper hook extends at least 2½” from the wall.

4. Lower hook will extend at least 1¼” from the wall.

L. Grab Bars

1. 18-gauge, type 304 stainless steel with 1½ inch clearance and 1-1/2-inch tubular.

2. Able to withstand 300-pound top loading.

M. Lockset

1. Meets ANSI A156.2 Series 4000, Grade 1 cylindrical lockset, 7 pin removable core 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. U.S. 26D finish.

8. zero bit removable core with control key

N. Paint

1. All paints and materials will conform to all ASTM standards for corrosion weathering, direct impact, flexibility and humidity resistance.

2. Paints will not contain more than .06% by weight of lead.

3. Type of paints for toilets.

a. Inside concrete surfaces.

i. Interior floors – chemical resistant urethane or epoxy. The color is gray.

ii. Interior walls and ceilings – modified acrylic, water repellent penetrating stain. The color is white followed by a clear acrylic anti-graffiti sealer.

b. Exterior concrete surfaces.

i. Exterior slab – clear sealer.

ii. Exterior walls and roof – acrylic water repellent penetrating stain in the same color as the walls or roof followed by a clear acrylic anti-graffiti sealer.

c. Metal surfaces (both inside and out).

i. DTM ALKYD.

O. Riser

1. Meets ADA standards.

2. Molded one-piece HDPE polyethylene that extends from the concrete base.

3. Smooth surface and have high impact resistance at extremely cold temperatures.

4. Hinged and tight-fitting cover with handle that completely covers the hole

5. seat holes shall be bean or oval shaped and cover the top of the riser and begin 1-1/2 inches from the front of the riser seat.

6. provide a separate seat with smaller opening for use by children. Seat is not permanently attached and shall site on top of the standard seat.

P. Caulking, Sealers and Curing Compounds

1. Curing compounds, if used, are colorless, complying with ASTM C309, type I or 1-D.

2. Weatherproofing sealer for exterior of building are a clear water repellent penetrating sealer.

3. Interior joints shall be caulked with acrylic latex caulk plus silicon color clear

4. Exterior joints shall be caulked with exterior all-purpose acrylic latex caulk plus silicon color clear

Q. Signs

1. Signs to have raised pictograms, letters, and braille to meet ADA.

2. Interior to have “No Trash in Vault” sign.

3. All signs inset a minimum of ¾” into wall with 45-degree bevel.

4. All signs to be anchored into concrete with ¼” x ¾” concrete anchor nails.

R. Toilet Paper Dispenser

1. Bar type and constructed of ¼” thick, type 304 stainless steel, satin finish.

2. Holds three (3) standard rolls of toilet paper.

3. Fastening system able to withstand 300-pound top loading.

S. Polyethylene Vault Liner

1. Made of a Roto molded 8460 polyethylene.

2. Holds up to 1,000 gallons of waste or 15,000 uses per vault.

3. Minimum thickness .100.

4. Molded dovetail embeds to attach the liner to concrete walls of the vault.

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

T. Vent Stack

1. Minimum 12” in diameter and a minimum 3’ higher than the roof peak.

2. Cover opening with insect and bird screen

3. Cover opening with rain shield

4. after installation, caulk joint between stack and roof.

U. Wall Vent

1. Vent cover is 14-gauge, type 304 stainless steel painted with DTM and anchored into the concrete wall with high strength anti-rust tap con fasteners.

2. Vent louver frame and louvers are non-vision, .1” extruded, aluminum jet coat finish.

3. Vent comes with insect screen.

4. Cover to be recessed a minimum ¾” on exterior walls with a 45-degree bevel. Interior to be flush mounted. Wall vent will not protrude from the wall.

V. Windows and Vault Cleanout Cover

1. Windows and cleanout cover frames are constructed from steel.

2. Window glazing is ³̷₁₆” thick translucent pebble finished mar-resistant Lexan.

3. Plate for vault cleanout cover is ¼” thick diamond plate steel.

4. Lid is hinged and configured so that it can be locked with a padlock. A gasket is provided around the entire perimeter of the lid to provide an airtight and water tight seal.

5. Windows to have ¾” recess with 45-degree bevel.

6. Windows frames to have vandal resistant fasteners.

W. Roof Insulation

1. Ceiling anchored ½” plywood + fiberglass laminate + 2” polyurethane foam, R-19.

X. Concrete Finish

1. Interior floor and exterior slabs are floated and troweled smooth

2. All exterior building walls and exterior screen walls are any one of the manufactures standard available textures.

3. All exterior surfaces of the roof panels are cast to simulate any one of the manufacturers available textures. The underside of the overhang shall have a smooth finish.

Y. Cracks and Patching

1. Cracks in concrete components which are judged to affect the structural integrity of the building shall be rejected.

2. Small holes, depressions, and air voids shall be patched with a suitable Portland Cement based material. The patch shall match the finish and texture of the surrounding surface.

3. Patching shall not be allowed on defective areas if the structural integrity of the building is affected.

7.0 FINISHING AND FABRICATION

A. Structural Joints

1. Wall components are joined together with two (2) welded plate pairs at each joint. a. Each weld plate is 6” long and located one (1) pair in the top quarter and one (1) pair in the bottom quarter of the seam.

b. Weld plates are anchored into the concrete panel and welded together with a continuous weld.

c. Inside seams shall be a paintable caulk.

d. Outside seams will use a caulk in a coordinating building color or clear.

2. Walls and roof are joined with weld plates, 3" x 6" at each building corner.

3. The joint between the floor slab and walls are joined with a grout mixture on the inside, a matching-colored caulk on the outside and two (2) weld plates 6” long per wall.

B. Painting/Staining

1. An appropriate curing time is allowed before paint is applied to concrete.

2. Some applications may require acid etching. A 30% solution of hydrochloric acid are used, flushed with water, and allowed to thoroughly air dry.

3. Painting will not be done outside in cold, frosty, or damp weather.

4. Painting will not be done outside in winter unless the temperature is 50ºF or higher.

5. Painting will not be done in dusty areas.

6. All surface voids are filled prior to painting.

7. Schedule of finishes. a. Inside concrete surfaces.

i. Inside floors – one (1) coat of 1-part water based chemical resistant urethane.

ii. Interior walls and ceilings – two (2) coats of a modified acrylic, water repellent penetrating stain, followed by one (1) coat of clear sealer.

b. Exterior concrete surfaces.

i. Exterior walls – two (2) coats of water repellent penetrating stain in the same color as the walls or roof followed by one (1) coat of clear acrylic anti-graffiti sealer.

c. Metal surfaces (both inside and out).

i. Two (2) coats of DTM ALKYD.

8.0 INSTALLATION OF DOUBLE VAULT RESTROOM

A. Scope of Work

1. Work specified under this section includes excavation, backfill and placement of precast concrete double vault restroom.

B. Materials

1. Bedding material shall be 12 inches of ⅜ inch crushed or screened aggregate.

2. Caulking between vault and toilet floor to be 1” x 1” Butyl tape designed specifically to bond precast concrete to precast concrete.

C. Excavation and Elevation

1. Comply with all applicable OSHA requirements for excavation.

2. Excavate for the installation of the restroom vault to a depth that will allow the structure site to be free draining after installation is completed. Over excavate 12 inches, to allow for a 12 inch compacted crushed stone. Level surface to accept restroom vault. Stockpile topsoil in a separate pile at sites.

3. Finish floor elevation shall be 4 inches to 6 inches above natural grade measured at the front (entrance) of the exterior slab unless otherwise approved by the contracting officer. The back of the building should be slightly higher to allow water to freely drain out of the restrooms.

4. Excavation and work area shall be secure. Coordinate delivery schedule and ensure that no excavation is left open more than seven (7) days unless otherwise approved by the Contracting Officer.

5. All excavations left open overnight are fenced with 6ft high temporary chain link fence.

a. The bottom of the fence shall follow the contour of the ground.

b. Maximum spacing of the steel posts is 8 feet to 10 feet.

D. Backfill and Compaction

1. Compact the natural ground at the bottom of the vault excavation with a minimum of three

(3) passes with a whacker-type mechanical compactor or equivalent.

2. provide aggregate bedding material for leveling course. Compact leveling course in two lifts.

Each lift shall be compact with one (1) pass from a whacker-type mechanical tamper or equivalent approved. Grade leveling course so there are no high spots in the middle of the vault bottom. Compact with a second pass with a whacker or approved equivalent tamper.

3. Set vault in place and check for level or appropriate scope. Backfill around structure. Use excavated material for backfill except those rocks larger than 6 inch in maximum dimension shall not be placed within 6” of the exterior vault walls.

4. Fill, adjacent to the building entry, shall have excavated material placed in 8 inch loose lifts and compacted with a minimum of two (2) passes with a whacker-type mechanical compactor of equivalent approved by the customer.

E. Finish Grading

1. Spread excess excavated material from the vault around structure. The intended final grade is flush with the top of the front slab. Allow for placement of 5-inch concrete apron to reach that grade.

Grade the backfill away from structure at maximum slope of 5% unless otherwise approved by the contracting officer.

2. Spread stockpiled topsoil as final layer after rough grading is completed. Areas disturbed by excavation, backfilling and stockpiling of excavated materials are hand raked to remove exposed rocks over 1” in maximum dimension.

3. Oversized rocks removed from the surface shall be piled for removal by the government.

F. Exhaust Pipe Installation

1. Attach top pipe extension and rain screen with four (4) stainless steel screws for each.

9.0 Workmanship

The Contractor is responsible for appropriate Quality Control and workmanship shall be the best of their respective kinds and in full accordance with applicable codes.

Upon Notice to Proceed, Contractor shall make steady and uninterrupted progress toward the completion of the work of this contract.

10.0 Security and Safety

The Contractor shall have unescorted access only to the site.

11.0 Place of Performance

A site visit is strongly recommended. The contractor may arrange a site visit by contacting the Contracting Officer (COR) between 8:00 a.m. and 4:00 p.m. on non-holiday weekdays.

12.0 Clean-Up

After completion of the work, construction debris, excess material and equipment shall be removed from the site and legally disposed. The site shall be graded. work areas will be left broom clean.

13.0 Submittals

Provide the following submittals:

1. Massachusetts Form WP 64a: Approval of tight tank for state and federal facilities-completed permit

2. Safety Plan-plan

3. Double vault restroom with professional engineer seal-11x17 shop drawings

4. Double vault restroom with professional engineer seal-11x17 permit drawings

5. Color samples

6. Door hardware-manufacture’s data

7. Lockset and core-manufacture’s data

14.0 Period of Performance

Preconstruction meeting – Will be held within one week of contract award.

Notice to Proceed – Will be provided to Contractor after preconstruction meeting and upon receipt of all required documents.

Work Restriction-Construction shall be performed around peak visitor period Memorial Day through Labor Day.

Material Submittals – Due within 48 hours (or 2 business days) of Notice to Proceed Proposed completed work with all documentation submittals – 150 days after date on the Notice to Proceed.

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