- 721 - SECTION 901 – FIELD LABORATO RIES, FIELD OFFICES, AND SCALE HOUSES
901.01 Description
1.The Contractor shall provide, furnish, and place the field office, laboratory, or scale house and then ma ke the required utility connections for the buildings as described in the contract.
2.The field offices, laboratories, and scale houses are for the exclusive use of the Engineer.
901.02 Material Requirements
1.General Requirements:
a.(1) Buildings shall be completely insulated and weathertight. (2) Buildings shall be constructed from wood or metal. b. The outside doors and windows shall be provided with screens and locks.
c.The floors shall be vinyl tile or a similar surface material. d. The Contractor shall provide cleaning and janitorial services for only those buildings with utility connections.
e.The Contractor shall furnish a safe, satisfactory, and dependable source of electricity for power and lights (120 volts AC) in all field laboratories and offices.
f.The Contractor shall furnis h an adequate and constant supply of clean water to the pressure system or the supply tanks as required to perform the necessary testing for the ty pe of field laboratories furnished.
g.The Contractor shall equip a ll field offices, laboratories, and scale houses with a suitable heating, ventilation, and air conditioning system which will maintain the temperatur e in the building at 70°F (21°).
h.The Contractor shall pr ovide a phone outlet and a phone in field offices as required by the Engineer. The Department will pay for installation (which includes trenching to the trailer), disconnection, and the monthly service fees.
i.The Contractor shall provide and maintain a commercial Underwriters' Laboratory approved fire extinguisher capable of controlling Class A, B, and C fires.
j.Light fixtures shall provid e illuminance of 93 foot-candles (1000 lx) on all working surfaces.
2.Field Laboratory, Type A:
a.In addition to the general re quirements, the field laboratory, Type A shall meet the following requirements:
1.The building's interior dimensions (approximate) shall be: (i) Width - 9 feet (2.7 m). (ii) Ceiling height - 7 feet (2.1 m). (iii) Minimum floor area - 230 square feet (21.4 m 2).
b.Two exterior doors and sufficient sliding or swinging type windows in each room to provi de adequate light and ventilation.
901.02 Field Laboratories, Fiel d Offices, and Scale Houses
- 722 - c. The building shall have a transverse partition and door to provide a drying-sieving room with floor area of approximately 70 square feet (6.5 m2). The drying-sieving room shall be equipped with a suitable work bench, an exhaust fan(s) capable of changing the air in the room every minute, and at least 1 exterior door and 1 window.
d.(1) The field laboratory room shall be equipped with solid work benches, a writing table or desk, and 2 chairs.
2.The work bench shall have a sink with a faucet and a hose bib connector. The Contractor shall in stall a sign above the sink prohibiting the disposal of hazardous material.
3.Wash water shall be drained from the building so as to avoid health and safety problems. Wash water shall not be discharged directly to waters of the State.
e.The building shall be equipped with an adequate water supply system, either a pressure or a gravity feed system with a minimum storage capacity of 100 gallons (379 L).
f.A minimum of 8 conveniently located 120 VAC duplex wall outlets shall be furnished.
g.The building shall be air conditioned so it can maintain constant temperature of 75°F (24°C) in the working space at all times.
3.Field Laboratory, Type B: a. In addition to the general re quirements, the field laboratory, Type B shall have the following requirements:
1.The building's interior dimensions (approximate) shall be:
i.Width - 7 1/4 feet (2.2 m). (ii) Ceiling height - 7 1/4 feet (2.2 m). (iii) Minimum floor area - 150 square feet (13.9 m 2).
b.An exterior door and sufficient sliding or swing type windows to provide adequate light and ventilation.
c.(1) Solid work benches, a writing table or desk, and a chair. (2) The work bench shall have sink with a faucet and hose bib connector. The Contractor shall install a sign above the sink prohibiting the disposal of hazardous material.
3.Wash water shall be drained from the building so as to avoid health and safety problems. Wash water shall not be discharged directly to waters of the State.
d.An adequate water supply with either a pressure or a gravity feed system with a minimum stor age capacity of 100 gallons (379 L).
e.(1) The field laboratory, Type B, when required on projects with asphaltic concrete pay items, shall be equipped with a tabletop fume hood, balance table, and a microwave oven.
2.The microwave oven shall be Underwriters' Laboratory approved, grounded, and have the capabi lity of producing a power output of 1,000 watt minimum, 120 VAC at 60 Hz. The internal dimensions shall be Field Laboratories, Field Of fices, and Scale Houses 901.02 - 723 - approximately 16 inches x 12 inches x 9 inches (height) [400 mm x 300 mm x 225 mm (height)].
3.An isolated, grounded circuit protected from current overload by a 15 amp circuit breaker s hall be provided specifically for the microwave.
4.The microwave oven must be placed on a solid flat work surface with at least 3 inches (75 mm) of space on all si des and a 1 inch (25 mm) space above the oven for proper air flow.
f.The building shall be air conditioned so it can maintain constant temperature of 75°F (24°C) in the working space at all times.
g.The building shall have at least 6 duplex electrical outlets. 4. Field Laboratory, Type C: a. In addition to the general re quirements, the field laboratory, Type C shall have the following:
1.The building's interior dimensions (approximate) shall be: (I) Width - 7 feet (2.1 m). (ii) Ceiling height - 7 feet (2.1 m). (iii) Minimum floor area - 91.5 square feet (8.5 m 2).
b.An exterior door and sufficient sliding or swinging type windows to provide adequate light and ventilation.
c.(1) Solid work benches, a writing table or desk, and a chair. (2) The work bench shall have sink with a faucet and hose bib connector. The Contractor shall install a sign above the sink prohibiting the disposal of hazardous material.
3.Wash water shall be drained from the building so as to avoid health and safety problems. Wash water shall not be discharged directly to waters of the State.
d.An adequate water supply for projects requiring water for testing.
e.Two 120 VAC duplex wall outlets. 5. Field Offices. a. In addition to the general requirements, the field office shall have the following requirements:
1.The building's interior dimensions (approximate) shall be: (i) Width - 7 1/4 feet (2.2 m). (ii) Ceiling Height - 7 1/4 feet (2.2 m). (iii) Minimum floor area - 105 square feet (9.8 m 2).
b.An exterior door and sufficient sliding or swing type windows to provide adequate light and ventilation.
c.The building shall be air conditioned so it can maintain a constant temperature of 75°F (24°C) at all times.
901.02 Field Laboratories, Fiel d Offices, and Scale Houses
- 724 - d. The field office shall be equipped with a 2 or 4-drawer filing cabinet, an office type desk having surface dimensions of approximately 30 inches x 60 inches (750 mm x 1.5 m), 2 chairs, and a work table or inclined surface suitable for supporting and examining a full size set of plans.
e.The field office shall be equipped with a minimum of 4 conveniently located duplex wall outlets.
6.Scales and Scale Houses
a.Material shall be weighed on approved scales. b. The Contractor shall furn ish a weather-proof scale house.
c.The scale house shall have or provide: (1) Floor area of approximately 43 square feet (4 m
2.and ceiling height of 7 feet (2.1 m) (approximate).
2.A window facing the platform, capable of sliding open to allow transfer of documents.
3.One desk and 2 chairs.
4.Minimum light on working surfaces and dials of 93 foot-candles (1000 lx).
901.03 Construction Methods
1.The Contractor sha ll place the building (off ice, laboratory, and/or scale house) in locations as directed by the Engineer and relocate the building, as necessary, as the work progresses when directed by the Engineer.
2.The building shall be leveled and solidly supported to eliminate vibration.
3.The Contractor shall connect the required utilities to the office, laboratory, and scale house.
901.04 Method of Measurement
1.Field laboratories and offices are measured for payment by the each.
901.05 Basis of Payment
1.P a y I t e m P a y U n i t Field Laboratory, Type _____ Each (ea) Field Office Each (ea)
2.The furnishing and operation of scales and scale houses by the Contractor will not be paid for dire ctly but shall be considered to be subsidiary to items being measured.
3.Payment is full compensation for all work described in this Section. - 725 - SECTION 902 -- GUARDRAIL AND GUARD POSTS
902.01 Description
1.This work consists of furnis hing and erecting guardrail and guard posts at locations shown in the contract.
2.Cable guardrail consists of wi re cables supported by cable mounts that are attached to steel posts.
3.W-beam and thrie-beam guardra il consists of rigid beam elements bolted to the posts with offset blocks. If shown in the contract or approved by the Engineer, the offset blocks may be omitted.
902.02 Material Requirements
1.Materials shall conform to the requirements in Table 902.01 or the contract. Table 902.01 Material Requirements Applicable Materials Section Reinforcin g Steel ............................................................... .1020 Steel Guardrail Posts, Special Posts, and Offset Blocks ... .1067 “W” and “Thrie”-Beam Guardrail ........................................ .1066 Wood Guardrai l Posts........................................................ .1075 Concrete Aggregate 1033
2.The concrete for use in guardrail anchors and footings shall be a readily available, commercially designed concrete mixture or Contractor- produced concrete, which shall achieve a minimum compressive strength of 3000 psi (20 MPa) at 28 days. The cement shall be Type I, Type II, or Type III. The aggregate shall be from acceptable sources.
3.Cable Guard Rail and Fittings a. The cable shall be 3/4 inch in diameter and shall conform to the requirements of AASHTO M 30. The cable shall, unless otherwise specified, meet the requirements for “T ype I” rope, with “Class A” galvanized coating.
b.Fittings shall be as shown in the contract and as required in AASHTO M 30.
c.All anchor rods, plates and fittings shall conform to the physical requirements of ASTM A 36. Turnbuckl es and clevises shall be steel forgings conforming to the requirements of ASTM A 668, Class B. The forgings shall be annealed prior to being machined.
d.Tension spring assemblies shall be as shown in the contract. Tension spring assemblies, when tested as installed in a normal cable guard rail installation, shall develop a mini mum tensile strength of 25,000 pounds per 3/4 inch cable. The coil spring shall conform to the requirements of ASTM A 689.
e.All fittings (rods, plates, turnbuckles, clevises, tension spring assemblies) shall have a uniform coating of zinc as required in AASHTO M 30.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 755–758 of 1,048.