Roadway Weather Information System – Environmental Sensor Station (RWIS -ESS) ROADWAY WEATHER INFORMATION SYSTEM – ENVIRONMENTAL SENSOR STATION (RWIS -ESS)
Part 1 — General
1.1 Section Includes
A.RWIS site preparation, including installing conduit, junction boxes with grounding rods, tower foundation and tower lower section, solar panel support, and concrete service pads.
B.State furnished and State installed equipment .
1.2 Related Sections
A.Section 02721: Untreated Base Course (UTBC)
B.Section 02776: Concrete Flatwork
C.Section 03055: Portland Cement Concrete
D.Section 03211: Reinforcing Steel and Welded Wire
E.Section 05120: Structural Steel
F.Section 13553: ITS Conduit
G.Section 13554: Underground Junction Box
H.Section 16530: Electrical Power
1.3 References
A.American National Standards Institute (ANSI)
B.ASTM A53: Pipe, Steel, Black and Hot -Dipped, Zinc -Coated, Welded and Seamless
C.National Electrical Code (NEC)
D.Underwriters Laboratory (UL) Roadway Weather Information System – Environmental Sensor Station (RWIS -ESS)
1.4 DEFINITIONS Not Used
1.5 SUBMITTALS Not Used
1.6 Department Supplied and Installed Items
A.Upper tower section and associated equipment.
B.Solar panels, mounting bracket, and battery box.
C.Communication equipment.
D.Remote processing unit.
E.Environmental sensors .
Part 2 — Products
2.1 State Furnished Items
A.Tower Base, Lower Tower Section.
B.RWIS Cabinet.
C.Solar Enclosure.
2.2 Power
A.Use electrical components as listed and defined by the NEC.
B.Conduit . Refer to Section 13553.
C.Junction Boxes . Refer to Section 13554 .
2.3 Concrete Service Pad
A.Untreated Base Course. Refer to Section 02721.
B.Concrete Flatwork. Refer to 02776.
C.Welded Wire Reinforcement . Refer to 03211. Roadway Weather Information System – Environmental Sensor Station (RWIS -ESS)
2.4 Concrete Foundation
A.Class AA(AE) concrete . Refer to Section 03055.
B.Coated deformed reinforcing steel . Refer to Section 03211.
2.5 Tower and Solar Grounding System
A.Wire 4 AWG solid bare copper grounding conductor . Refer to AT Series Standard Drawings and NEC Article 250.
B.Ground Rod. Refer to Section 16530 and NEC Article 250 .
C.Ground Clamps
1.Rod clamps ANSI rated and UL listed for use on ¾ inch copper bonded steel rods and 4 AWG solid bare copper grounding conductor .
2.Pipe clamps ANSI rated and UL listed for use on 1 inch aluminum pipe.
3.Pipe clamps ANSI rated and UL listed for use on 4 inch steel pipe.
2.6 Solar Panel Support
A.Use galvanized 4 inch nominal diameter schedule 80, ASTM A53 grade B steel pipe. Refer to Section 05120.
Part 3 — Execution
3.1 Preparation
A.Notify the Engineer at least 30 days in advance of beginning work on RWIS -ESS facilities.
B.Contact the Engineer at least 14 calendar days before RWIS -ESS State furnished items are needed to schedule pick -up of items .
C.Pick up State furnished items at the following location: Utah Department of Transportation Traffic Operations Center (TOC) 2060 South 2760 West Salt Lake City, Utah 84104 Roadway Weather Information System – Environmental Sensor Station (RWIS -ESS)
3.2 Installation
A.Construct according to the AT Series Standard Drawings
3.3 Solar Panel Foundation and Support
A.Cast the foundation and concrete service pad monolithically.
B.Install solar panel support plumb vertical.
3.4 Rwis Tower Foundation and Concrete Service Pad
A.Cast f oundation and concrete service pad monolithically.
3.5 Tower Grounding System
A.Wire– Install one 4 AWG solid bare ground ing conductor for each tower leg.
1.Clamp wire to the outside ground rod 10 ft from tower leg and run to the inside ground rod (3 ft from tower leg).
2.Clamp wire to the inside ground rod.
a.Do not cut the wire.
3.Run the wire below then penetrate up through the concrete pad to the corner of the RWIS tower.
B.Install concrete encased grounding electrode in foundation and bond to tower base and equipment grounding conductor. Refer to Section 16530.
C.Ground Rod
1.Install ground clamps on ground rods and attach 4 AWG solid bare copper wire, buried in earth or concrete.
2.Install ground pipe clamps on each leg of lower tower section and connect grounding conductors .
3.6 Solar Grounding System
A.Wire– Install one 4 AWG solid bare ground ing conductor to solar pole.
1.Clamp wire to the outside ground rod 10 ft from pole and run to the inside ground rod (3 ft from pole).
2.Clamp wire to the inside ground rod.
a.Do not cut the wire.
3.Run the wire below then penetrate up through the concrete service pad and attach to the solar pole . Roadway Weather Information System – Environmental Sensor Station (RWIS -ESS)
B.Install concrete encased grounding electrode in foundation and bond to solar pole and equipment grounding conductor. Refer to Section 16530.
C.Ground Rod
1.Install ground clamps on ground rods and 4 AWG solid bare copper wire, buried in earth or concrete.
2.Install ground pipe clamps on solar panel support pole.
Source: Utah Standard Specifications for Road and Bridge Construction, 2026 Edition. Pages 1265–1269 of 1,331.