Attachment B Foundation Standards.pdf
PDF 995 KB Posted
- Attached to
- MDOT AWOS Concrete and Electrical Work
- Solicitation number
- RFP 591 260000001627 1
- Issued by
- Michigan
About this file
This is a technical specifications document for the Michigan Department of Transportation (MDOT) Office of Aeronautics detailing foundation standards and installation requirements for Automated Weather Observation System (AWOS) installations at Michigan airport sites, including Gladwin Zettel Memorial Airport (GDW) and Paul C. Miller–Sparta Airport (8D4). The document provides comprehensive engineering plans and specifications for excavation, landscaping, grounding systems, and sensor layout configurations. It includes detailed CAD drawings showing excavation depths ranging from 2 to 5 feet, specifications for limestone geotextile materials, earth electrode systems with copper components, and precise placement of weather sensors including lightning sensors, wind towers, barometers, rain gauges, and visibility equipment. The installation specifications outline requirements for communication cables, power cables, counterpoise wires, and ground rods with specific depth, spacing, and separation requirements to ensure proper functionality and safety of the AWOS installations.
The foundation standards establish minimum installation depths of 24 inches below finished grade for communication and power cables, with lateral spacing requirements of at least 6 feet between different cable types except where necessary for duct bank entry. Ground rods must be spaced no more than 300 feet apart around the entire circuit, with 3-foot separation from duct or conduit ends, and the top of each rod must be at least 10 inches below finished grade. Backfilling procedures require specific layer depths and compaction standards, with concrete markers required at duct and conduit ends. Trenches must be a minimum of 24 inches deep and 6 inches wide, with conduit installations at a minimum of 36 inches below finished grade graded at 3 inches per 100 feet toward handholes and duct ends. The document establishes standards applicable to all Michigan AWOS sites, providing contractors with uniform technical requirements for concrete and electrical work at multiple airport locations.
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Text version
A1
A2
A3
A4
A5
A6
A7
A8
A9
N
A A
21.0
2' excavation around the perimeter of the excavation.
Access ramp from ground level to the bottom of the excavation.
3' excavation.
4' excavation.
5' excavation.
34.0'
Scale 1" = 4'
2.0 ' 3.0
' 4.0
2.0
5.0'
A-A
A10 Rev # Date DESCRIPTION Initials
Michigan Department of Transportation
OFFICE OF AERONAUTICS
Electronic Facilities Unit
Drawn By: P. Murphy
Date: 01/02/2025
Site: GDW
Gladwin Zettel Memorial Airport
EXCAVATION PLAN
File Name: GDW AWOS 2024.dwg
AutoCAD SHX Text All excavated soil will be placed at the
AutoCAD SHX Text corners of the site to allow maximun
AutoCAD SHX Text access to the excavation site for further
AutoCAD SHX Text work.
AutoCAD SHX Text The excess excavated soil will be
AutoCAD SHX Text disbursed at a site that will be determined
AutoCAD SHX Text and approved by the authorized MDOT
AutoCAD SHX Text person.
N 6AA Limestone
Geotextile material
6AA Limestone
Geotextile material
6AA Limestone
Geotextile material
A11 Rev # Date DESCRIPTION Initials
Michigan Department of Transportation
OFFICE OF AERONAUTICS
Electronic Facilities Unit
Drawn By: P. Murphy
Date: 01/02/2025
Site: GDW
Gladwin Zettel Memorial Airport
LANDSCAPING PLAN
File Name: GDW AWOS 2024.dwg
Lightning Sensor
|--------------------17'-----------------|
AutoCAD SHX Text 4"
AutoCAD SHX Text 2"
AutoCAD SHX Text 6"
AutoCAD SHX Text Perimeter Edging
AutoCAD SHX Text 4"
AutoCAD SHX Text Foundation Edging
AutoCAD SHX Text Earth Electrode Access Edging
AutoCAD SHX Text 18'
AutoCAD SHX Text Scale 1" = 3'
AutoCAD SHX Text 21'
AutoCAD SHX Text
EARTH ELECTRODE ACCESS
AutoCAD SHX Text 6'
AutoCAD SHX Text 4'
Top of Limestone
#2 AWG Bare Copper, 7 Strand
4/0 AWG Bare Copper, 19 Strand
Cadweld Mold
P/N: GTC 182Q
#115 Weld Metal
Cadweld Mold
P/N: PCC 2Q1V
#115 Weld Metal
3/4" x 10' Copper Clad Ground Rod (4)
#2 AWG Bare Copper, 7 Strand
Plastic Bushings (2)
POWER CABLE CONDUIT
1" Galvanized Rigid
Counterpoise above underground cable to enter access well 10 - 14" below top of well cover.
COMMUNICATIONS CABLE CONDUIT
1" Galvanized Rigid
4/0 AWG Bare Copper, 19 Strand
3/4" x10' Ground Rod
NEUTRAL CONDUIT
3/4" Galvanized Rigid
MDOT WILL MAKE CONNECTIONS
IN ACCESS WELL
Cadweld Mold
P/N: SSC 20
#90 Weld Metal
Cover
Quazite P/N PG1324BA08 Enclosure w/No Base
Wind Tower Signal Conduit 3/4" Galvanized Rigid
Quazite P/N PG1324EA08 Enclosure Extension
Quazite P/N PG1324DA12 Enclosure w/Base
A12 Rev # Date DESCRIPTION Initials
Michigan Department of Transportation
OFFICE OF AERONAUTICS
Electronic Facilities Unit
Drawn By: Zach Tecson
Date: 11/05/2021
Site: 8D4
Paul C. Miller - Sparta Airport
EARTH ELECTRODE SYSTEM
File Name: 8D4 AWOS 2021.dwg
Lightning Sensor
30'
|-------------17"---------------|
RWY 07/25
TRUE
1 Temperature & Dewpoint Variation = 5° 43' W
Visibility
Removed Scale 1" = 3' VHF Transmitter
ACU Processor
VHF Antenna
Rain Gage
Barometer Vent
Removed
UPS + UPS Batteries
Ultrasonic Wind Sensor
Dual Obstruction Light
Wind Tower
4" 6AA limestone over geotextile weedblock.
50'
Drawn By: Zach Tecson Paul C. Miller - Sparta Airport A13
Rev # Date DESCRIPTION Initials Michigan Department of Transportation
OFFICE OF AERONAUTICS
Electronic Facilities Unit
Date: 11/05/2021
Site: 8D4
SENSOR LAYOUT
File Name: 8D4 AWOS 2021.dwg
Lightning Sensor
|----------------17'-------------------|
AUTOMATED WEATHER OBSERVATION SYSTEM
SPECIFICATIONS - ALL MICHIGAN SITES
INSTALLATION SPECIFICATIONS:
Communication and Voice Cable Depth minimum of 24 inches below finished grade
Spacing minimum of 6 feet from any power cable, except as necessary to enter a duct bank; minimum of 10 inches below any counterpoise (guard) wire
Power Cable Depth - trenched each conductor a minimum of 24 inches below finished grade
Depth - plowed top conductor a minimum of 24 inches below finished grade, with the second conductor a minimum of 3 inches below the top conductor
Spacing - trenched two conductors spaced laterally a minimum of 3 inches apart; a minimum of 6 feet from any communication or voice cable, except as necessary to enter a duct bank; minimum of 10 inches below any counterpoise (guard) wire
Spacing - plowed two conductors spaced vertically a minimum of 3 inches apart, with the top conductor spaced a minimum of 10 inches below any counterpoise (guard) wire; and a minimum of 6 feet from any communication cable, except as necessary to enter a duct bank
Counterpoise (Guard) Wire Depth a minimum depth of 14 inches below finished grade, while maintaining separation of 10 inches above any cable
Spacing a minimum of 10 inches above any cable, while maintaining a minimum depth of 14 inches below finished grade; will be terminated 3 feet from any duct
Ground Rod Depth top of rod a minimum of 10 inches below finished grade
Spacing spaced no more than 300 feet apart around the entire circuit;
spaced 3 feet from the end on any duct or conduit
Specifications - Page 1
A14
Trench Depth a minimum depth of 24 inches below finished grade
Width a minimum of 6 inches wide
Spacing a minimum of 6 feet apart for communication/voice cables and power cables, except as necessary to enter a duct bank
Backfilling 1st Layer 4 inches deep, loose measurement; not compacted
2nd Layer 4 inches deep, loose measurement; then tamped and compacted
Other Layers not to exceed 8 inches deep, loose measurement; then tamped and compacted
Concrete Marker Size 2 foot square by 4 inches thick, OR 24 inches in diameter by 4 inches thick
Placement flush with ground at th end of each duct or conduit; placed immediately above the end of the duct or conduit
Marking DUCT (with quantity and sizes); letters/numbers 4 inches high and 3 inches wide, with ½ inch width of stroke and 1/4 inch deep
Conduit Depth a minimum depth of 36 inches below finished grade
Grade 3 inches per 100 feet, toward handholes, manholes, and duct ends
Length extend 5 feet beyond edge of pavement or any under drains installed alongside paved area
Trenches SINGLE - - not less than 6 inches nor more than 12 inches wide 2 OR MORE - - proportionately wider
Specifications - Page 2
A15
| Foundation Standards Vaisala.pdf |
| GDW AWOS 2024_09Excavation.pdf |
| Sheets and Views |
| GDW AWOS 2024-Excavation |
| GDW AWOS 2024_08Landscaping.pdf |
| Sheets and Views |
| GDW AWOS 2024-Landscaping |
| 8D4.8 Earth Electrode System.pdf |
| 8D4.5 Sensor Layout.pdf |
File details come from the government source that posted it. Updated .