Ladd Spec updated Sheet 4 B53347.pdf
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- Solicitation number
- 27-494DOT-FINAD-B-53347
- Issued by
- Dekalb County, Lee Center CDP, Illinois
About this file
This is an electrical site plan specification sheet for the Illinois Department of Transportation District 3 Ladd Maintenance Yard generator installation project. The document provides detailed technical specifications for installing a 96 kW/120 kVA standby natural gas engine generator with associated electrical infrastructure modifications at the Ladd facility in Bureau County, Illinois. The project scope includes installation of a 400-amp NEMA 3R automatic transfer switch (ATS-1), a 400-amp fused disconnect switch, new grounding systems with multiple ground conductors in various conduit sizes, control wiring for the generator system, concrete generator pad construction (10 feet by 5 feet by 6 inches thick), pressure regulators and shut-off valves for gas piping connections, remote annunciator panel and emergency shut-down switch, and modifications to existing electrical panels including Panel "PP-1" (400A main distribution), Panel "D0222 MDP" (200A), Panel "D0223 5-BAY" (100A), Panel "D0222 BAY #2" (100A), and the Tire Shed Panel (100A). The work requires coordination with Ameren Illinois for gas and electric utility connections, with an estimated utility cost of approximately $7,500. All surface material removal, excavation, trenching, backfill, and compaction will be performed by IDOT staff, while the contractor is responsible for all equipment provision, installation, programming, and utility coordination. Construction operations are prohibited during the winter operation schedule (November 1 through April 1), with a maximum 24-hour power shut-down window requiring minimum 14 days advance approval from the IDOT Yard Supervisor. The contractor must provide an over-current protective device coordination study, comply with 2023 National Electrical Code standards, coordinate with J.U.L.I.E. for utility location information, and ensure that all existing structures, utilities, and facilities remain operational unless specifically marked for removal by utility companies.
The specification sheet requires the contractor to maintain secure mounting of all equipment to building exteriors, seal all conduit penetrations with non-shrink grout, and ensure water and weather-tight installations. Existing equipment including utility poles, fire hydrants, fuel islands, water tanks, and underground utilities (septic, telephone, water piping, and abandoned electric lines) are to remain in place unless removed by respective utility companies. All temporary power disruptions must be pre-approved and coordinated with the IDOT Yard Supervisor, with construction operations prohibited from blocking yard or building access. Prairie Engineers will provide periodic construction observation visits and require minimum seven days notice of milestone events for concrete work, equipment startup, and utility connections, with project engineer contact Bill Whitlow available at (217) 608-4255. The specifications reference additional details contained in Sheet 8 of the eight-sheet drawing set and panel schedules on Sheet 7, with the drawing prepared by Prairie Engineers of Illinois, P.C. (professional design firm no. 184-005965) and dated August 5, 2026.
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TO PANEL "D0222".
REMOVE EXISTING FEEDER CIRCUITY AND ABOVE GRADE CONDUIT FROM PANEL "D0222 MDP"
"D0223 5 BAY". ABANDON EXISTING BELOW-GRADE FEEDER CIRCUITRY IN PLACE.
REMOVE EXISTING ABOVE-GRADE FEEDER CIRCUITRY FROM PANEL "DO222 MDP" TO PANEL
EXISTING MAIN DISTRIBUTION PANEL "PP-1".
REMOVE EXISTING CONDUIT/CONDUCTORS FROM EXISTING 400A CT METER CABINET TO
BAY #2".
REMOVE EXISTING FEEDER CIRCUITRY FROM PANEL "D0222 MDP" TO EXISTING PANEL "D0222
EXISTING CONCRETE SLAB AND FOUNDATION TO BE REMOVED IN ITS ENTIRETY BY I.D.O.T.
BRANCH CIRCUITRY TO REMAIN AND BE RECONNECTED TO NEW PANEL BREAKERS.
"D0222 BAY #2". ABANDON EXISTING BELOW-GRADE FEEDER CIRCUITRY IN PLACE. EXISTING
REMOVE EXISTING TIRE SHED PANEL AND ABOVE-GRADE FEEDER CIRCUITRY FROM PANEL
ENTRANCE CONDUCTORS WITH AMEREN.
CONDUCTORS. COORDINATE DISCONNECTION AND REMOVAL OF OVERHEAD SERVICE
REMOVE EXISTING ELECTRICAL METER, WEATHERHEAD, AND SERVICE ENTRANCE
X
NOTES:
E T
T
E
DEMOLITION NOTES:
ATS
CONTRACTOR SHALL PROVIDE ALL GENERATOR/ATS EQUIPMENT, PROGRAMMING AND APPURTENANCES AS REQUIRED FOR A COMPLETE AND FULLY FUNCTIONAL STAND BY GENERATOR SYSTEM.8.
PROVIDE OVER CURRENT PROTECTIVE DEVICE COORDINATION STUDY AND APPROPRIATE LABELS ON ELECTRICAL EQUIPMENT AT LADD MAINTENANCE YARD.7.
REFER TO SHEET 2 FOR GENERAL NOTES AND SYMBOLS LIST.6.
ALL UTITLITY CABLES AND LINES SHALL BE LOCATED BY THE RESPECTIVE UTILITY CONTRACTOR. CONTACT J.U.L.I.E. (JOINT UTILITY LOCATION INFORMATION FOR EXCAVATORS) FOR UTILITY INFORMATION.5.
CONTRACTOR CONSTRUCTION OPERATIONS OR VEHICLES SHALL NOT BLOCK ACCESS TO THE YARD OR BUILDINGS.4.
SUPERVISOR A MINIMUM OF 14 DAYS IN ADVANCE. POWER SHUT-DOWN SHALL NOT BE GREATER THAN 24 HOURS.
ALL TEMPORARY POWER SHUT-DOWN FOR SYSTEM TIE-IN OR REPLACEMENT FOR ANY PORTION OF THE ELECTRICAL SYSTEM SHALL BE COORDINATED AND PRE-APPROVED BY THE I.D.O.T. YARD 3.
NO CONSTRUCTION OPERATIONS INTERRUPTING MAINTENANCE YARD ACCESS SHALL OCCUR DURING I.D.O.T. WINTER OPERATION SCHEDULE (NOVEMBER 1 THROUGH APRIL 1)2.
DAYS IN ADVANCE,
CONDUITS, GROUND FIELDS, PULL BOXES, BOLLARDS, ETC. WITH I.D.O.T. ALL TRENCHING/EXCAVATION REQUIREMENTS SHALL BE COORDINATED WITH THE I.D.O.T. YARD SUPERVISOR A MINIMUM OF 14
ALL SURFACE MATERIAL REMOVAL/REPLACEMENT, EXCAVATION, TRENCH EXCAVATION, BACKFILL MATERIAL AND COMPACTION TO BE BY I.D.O.T. COORDINATE INSTALLATION OF CONCRETE PADS, 1.
BARN TO REMAIN
EXISTING SALT
SHED TO REMAIN
EXISTING TIRE
D0222 TO REMAIN
EXISTING BUILDING
PANEL "PP-1"
FRONTAGE ROAD
G
SCALE:
1" = 30'
ELECTRICAL SITE PLAN - LADD MAINTENANCE YARD
G
D0223 TO REMAIN
EXISTING BUILDING
42'-0"
TO REMAIN
EXISTING SHED
D0390 TO REMIAN
EXISTING BUILDING
PANEL "252-A"
PANEL "D0223 5-BAY"
PANEL "D0222 MDP"
PANEL "D0222"
PANEL "D0222 BAY #2"
TIRE SHED PANEL
KEYED NOTES:
REPRESENTITIVE AND YARD SUPERVISOR FOR EXACT MOUNTING LOCATIONS OF ANNUNCIATOR AND SHUT-DOWN SWITCH.
SHUT-DOWN SWITCH WIRING, INSTALLED PER MANUFACTURER'S WRITTEN INSTRUCTIONS. COORDINATE WITH I.D.O.T. FIELD
PROVIDE GENSET REMOTE ANNUNCIATOR PANEL AND GENSET EMERGENCY SHUT-DOWN SWITCH. PROVIDE ANNUNCIATOR AND
AND CONDUITS FOR EACH CIRCUIT PER MANUFACTURER'S WRITTEN INSTRUCTIONS.
MANUFACTURER'S WRITTEN REQUIREMENTS FROM PANEL "PP-1" TO GENERATOR (GEN-1). PROVIDE BREAKERS, CONDUCTORS
PROVIDE MAINTENANCE CIRCUITS IN 1" CONDUIT (ENGINE BLOCK HEATER, BATTERY CHARGER, ETC.) AS REQUIRED PER
MANUFACTURER'S WRITTEN INSTRUCTIONS.
TRANSFER SWITCH (ATS-1) TO GENERATOR (GEN-1) FOR CONTROL SYSTEM. PROVIDE QUANTITY OF CONDUIT/CONDUCTORS PER
PROVIDE CONTROL WIRING IN 1" CONDUIT OR AS REQUIRED PER MANUFACTURER'S WRITTEN INSTRUCTIONS FROM AUTOMATIC
INSTALLATION AND SEAL ANNULAR SPACE WITH NON-SHRINK GROUT AND MAKE WATER/WEATHER TIGHT.
BUILDING ABOVE OFFICE CEILING TO EXISTING MAIN DISTRIBUTION PANEL "D0222 MDP". CORE DRILL BRICK WALL FOR CONDUIT
ROUTE CONDUIT/CONDUCTORS FROM PULL BOX, UP EXTERIOR BRICK WALL (SECURELY FASTENED AT 4'-0" INTERVALS), INTO
EXISTING SEPTIC TANK AND SANITARY LINES TO REMAIN.
EXISTING ABANDONED UNDERGROUND ELECTRIC TO REMAIN.
EXISTING UNDERGROUND CONDUIT/CONDUCTORS TO REMAIN.
EXISTING UNDERGROUND TELEPHONE LINE TO REMAIN.
EXISTING UNDERGROUND DOMESTIC WATER PIPING TO REMAIN.
EXISTING CULVERT TO REMAIN.
TRENCHING, BACKFILL MATERIAL AND COMPACTION REQUIREMENTS WITH I.D.O.T.
GRADE. DISCONNECT ANY EXISTING GROUND WIRES FROM NEUTRAL BAR AND RECONNECT TO NEW GROUND BAR. COORDINATE
MAIN BREAKER AND GROUND BAR IN EXISTING PANEL "D0223 5-BAY". PROVIDE (3) #3 AND #8 GROUND IN 1-1/4” CONDUIT BELOW EXISTING POWER PANEL "D0223 5-BAY" (SQUARE D, QO LOAD CENTER, 100A, 240/120V, 1ϕ, 3W) TO REMAIN. PROVIDE NEW 40A
EXISTING BOLLARDS TO REMAIN.
REFER TO DETAIL 1 ON SHEET 8 FOR ADDITIONAL INFORMATION.REQUIREMENTS WITH I.D.O.T.
COORDINATE EXCAVATION, TRENCHING, BACKFILL MATERIAL AND COMPACTION PROVIDE NEW UNDERGROUND PULL BOXES.
PANEL "D0222 MDP" MAIN BREAKER. REFER TO PANEL SCHEDULES ON SHEET 7 FOR REQUIREMENTS.
REQUIREMENTS WITH I.D.O.T. CONNECT TO NEW 200 AMP, 2-POLE ENCLOSED CIRCUIT BREAKER AND TO MAIN DISTRIBUTION PROVIDE (3) #4/0 AND #4 GROUND IN 2-1/2" CONDUIT, COORDINATE TRENCHING, BACKFILL MATERIAL AND COMPACTION
TRANSFER SWITCH (ATS-1). COORDINATE TRENCHING REQUIREMENTS FOR BELOW-GRADE CONDUIT INSTALLATION WITH I.D.O.T.
PROVIDE 2 SETS OF (3) #3/0 AND #3 GROUND IN (2) 2" CONDUIT BELOW GRADE FROM GENERATOR (GEN-1) TO AUTOMATIC
INSTALLATION OF AUTOMATIC TRANSFER SWITCH WITH AMEREN REGARDING REQUIREMENTS, INSTALLATION AND LOCATION.
AUTOMATIC TRANSFER SWITCH AND FROM AUTOMATIC TRANSFER SWITCH TO EXISTING PANEL "PP-1". COORDINATE EXTERIOR. PROVIDE 2 SETS OF (3) #3/0 AND #3 GROUND IN (2) 2" CONDUIT ABOVE GRADE FROM DISCONNECT SWITCH TO PROVIDE NEMA 3R, 400A, 240/120VAC, 1ϕ, 3W, 3-POLE AUTOMATIC TRANSFER SWITCH (ATS-1), SECURELY MOUNTED TO BUILDING
ADDITIONAL GENERATOR PAD INFORMATION.
REFER TO DETAIL 5 ON SHEET 8 FOR ALL DIRECTIONS. COORDINATE PAD INSTALLATION WITH CONDUIT INSTALLATIONS.
COORDINATE PAD DIMESIONS WITH ACTUAL EQUIPMENT PROVIDED, PAD SHALL EXTEND 1'-0" BEYOND LIMITS OF EQUIPMENT IN GENERATOR PAD. COORDINATE EXCAVATION, TRENCHING, BACKFILL MATERIAL AND COMPACTION REQUIREMENTS WITH I.D.O.T.
COORDINATE WITH AMEREN FOR TEMPORARY GAS SERVICE DISCONNECTION. PROVIDE 10' +/- X 5' +/- X 6" THICK CONCRETE SERVICE PIPING. PROVIDE PRESSURE REGULATOR, STRAINER AND SHUT-OFF VALVE IN GAS PIPING TO GENERATOR.
INSTALLED) TO EXISTING 2" NATURAL GAS SERVICE PIPING. CONTRACTOR TO FIELD VERIFY SIZE OF EXISTING NATURAL GAS AS REQUIRED TO CONNECT NEW 2" GAS FEED FOR GENERATOR (COORDINATE REQUIREMENTS WITH ACTUAL EQUIPMENT PROVIDE 96KW/120KVA STANDBY NATURAL GAS ENGINE GENERATOR (GEN-1) IN WEATHERPROOF HOUSING. PROVIDE FITTINGS
DISCONNECT SWITCH.
TO BUILDING EXTERIOR. PROVIDE 2 SETS OF (3) #3/0 AND #3 GROUND IN (2) 2" CONDUITS FROM EXISTING METER BASE TO PROVIDE 400A, NEMA 3R, HEAVY-DUTY SERVICE RATED FUSED DISCONNECT SWITCH (FUSED AT 400 AMPS), SECURELY MOUNTED
FOR BREAKER REQUIREMENTS.
BRANCH CIRCUITRY. RECONNECT ANY EXISTING GROUND WIRES TO GROUND BAR. REFER TO PANEL SCHEDULE ON SHEET 7 MATERIAL AND COMPACTION REQUIREMENTS WITH I.D.O.T. PROVIDE BREAKERS AS REQUIRED TO RECONNECT EXISTING CONDUIT PENETRATION WITH NON-SHRINK GROUT AND MAKE WATER/WEATHER TIGHT. COORDINATE TRENCHING, BACKFILL AND #8 GROUND IN 1-1/4” CONDUIT FROM EXISTING PANEL "D0222 BAY #2" TO TIRE SHED PANEL. SEAL ANNULAR SPACE AROUND PROVIDE 100A, 240/120VAC, 1ϕ, 3W, NEMA 1, 12 CIRCUIT POWER PANEL WITH 100A MAIN BREAKER IN TIRE SHED. PROVIDE (3) #3
GROUND BAR.
EXISTING BUILDING "D0222 MDP". DISCONNECT ANY EXISTING GROUND WIRES FROM NEUTRAL BAR AND RECONNECT TO MAIN BREAKER AND GROUND BAR IN EXISTING PANEL "D0222 BAY #2". PROVIDE (3) #3 AND #8 GROUND IN 1-1/4” CONDUIT FROM EXISTING POWER PANEL "D0222 BAY #2" (SQUARE D, QDC16UF, 100A, 240/120V, 1ϕ, 3W) TO REMAIN. PROVIDE NEW 100A, 2-POLE
EXISTING MAIN DISTRIBUTION PANEL "D0222 MDP" (SIEMANS, TYPE SE, 200A, 1ϕ, 240/120V, 3W) TO REMAIN.
EXISTING RIP RAP TO REMAIN.
EXISTING ROCK SURFACE TO REMAIN.
EXISTING CONCRETE PAVEMENT TO REMAIN.
EXISTING ASPHALT PAVEMENT TO REMAIN.
EXISTING OVERHEAD ELECTRICAL CONDUCTORS TO REMAIN, OR BE REMOVED BY UTILITY COMPANY.
EXISTING FENCE TO REMAIN.
EXISTING FENCE AND GATE TO REMAIN.
EXISTING WATER TANKS TO REMAIN.
EXISTING MANHOLES AND SEPTIC TANK TO REMAIN.
EXISTING OIL SEPERATOR TO REMAIN.
EXISTING GRASS AREA TO REMAIN.
EXISTING CONCRETE PAD TO REMAIN.
EXISTING UTILITY POLE TO REMAIN, OR BE REMOVED BY UTILITY COMPANY.
EXISTING FLAG POLE TO REMAIN.
EXISTING FIRE HYDRANT TO REMAIN.
EXISTING FUEL ISLAND TO REMAIN.
EXISTING POWER PANEL "252-A" (GENERAL ELECTRIC, AQF, 100A, 240/120V, 1ϕ, 3W) TO REMAIN.
EXISTING MAIN DISTRIBUTION PANEL "PP1" (SIEMENS, TYPE P1, 400A, 240/120V, 1ϕ, 3W) TO REMAIN.
DISCONNECT ANY EXISTING GROUND WIRES FROM NEUTRAL BAR AND RECONNECT TO NEW GROUND BAR.
IN EXISTING PANEL "D0222". PROVIDE (3) #8 AND #10 GROUND IN 3/4" CONDUIT ABOVE GRADE FROM PANEL "D0222 MDP".
EXISTING POWER PANEL "D0222" (SQUARE D, QO LOAD CENTERE, 50A, 240/120V, 1ϕ, 3W) TO REMAIN. PROVIDE NEW GROUND BAR
EXISTING NATURAL GAS SERVICE/METER TO REMAIN.
EXISTING 400 AMP CT METER/CABINET TO REMAIN.
EXISTING 50KVA, 7200V TO 120/240VAC, 1ϕ, 3W PAD MOUNT TRANSFORMER TO REMAIN.
X
AE
UTILITY INFORMATION
(815)343-8303 athompson4@ameren.com
ELECTRIC/GAS: AMEREN ILLINOIS
LADD IDOT YARD;
AS REFERENCE ONLY.
$7,500.00 TO COMPLETE THE WORK. THIS QUOTE IS BEING PROVIDED
PROJECT. AMEREN HAS QUOTED TO THE ENGINEER APPROXIMATELY
THE UTILITY WORK IS DONE IN SUCH A MANNER AS TO NOT DELAY THE
CONTRACTOR WILL ASSUME THE RESPONSIBILITY TO ENSURE THAT
COMPANY WILL BE PAID IN FULL BY THE CONTRACTOR. THE
WITH THE UTILITY COMPANY. CHARGES REQUIRED BY THE UTILITY
SCHEDULE THE UPGRADE OF THE GAS SERVICE TO THE BUILDING
THE CONTRACTOR IS RESPONSIBLE TO COORDINATE WITH AND
NOTE:
608-4255) FOR MILESTONE EVENT COORDINATION.
DAYS NOTICE OF MILESTONE EVENTS. CONTACT BILL WHITLOW (217-
CONTRACTOR SHALL PROVIDE PRAIRIE ENGINEERS A MINIMUM OF 7
GAS/ELECTRIC CONNECTIONS, EQUIPMENT STARTUP, ETC.).
AND AT CERTAIN MILESTONE EVENTS (CONCRETE WORK,
DOCUMENTS. PRAIRIE ENGINEERS WILL BE ON SITE PERIODICALLY
WORKMANSHIP ARE IN ACCORDANCE WITH THE CONTRACT
CONSTRUCTION SCHEDULE AND THAT THE MATERIALS, FINISHES AND
WORK IS PROGRESSING IN ACCORDANCE WITH THE APPROVED
THE WORK BEING PERFORMED TO DETERMINE, IN GENERAL, THAT THE
OBSERVATION VISITS TO REPORT ON THE PROGRESS AND QUALITY OF
PRAIRIE ENGINEERS WILL PROVIDE CONSTRUCTION SITE
CONSTURCTION INSPECTION:
J
SECTION COUNTY
ILLINOIS
N/A BUREAU
TOTAL
SHEETS
SHEET
NO.RTE.
(011,037) ELE,EG,MG
USER NAME =
PLOT DATE = DATE
DESIGNED
CHECKED
DRAWN
REVISED
REVISED
REVISED
REVISED
F.A.
SHEET OF 8 SHEETS STA. TO STA.
CWB
5/1/2025
8/5/2026
CONTRACT NO.
SCALE: 1" = 30'
STATE OF ILLINOIS
DEPARTMENT OF TRANSPORTATION
ELECTRICAL SITE PLAN - LADD MAINTENANCE YARD
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8 4 professional design firm no. 184-005965 www.prairieengineers.com
Copyright Prairie Engineers of Illinois, P.C. 2023
Columbia, IL 62236
(217) 605-0403
404 N. Main Street
Prairie Engineers, P.C.
30'-0"15'-0"0
Expires: 11/30/2025 Date: 5/1/2025
SECURELY MOUNTED TO BUILDING.
PROVIDE 200A, 2-POLE, NEMA 3R ENCLOSED CIRCUIT BREAKER, 65,000 AIC MINIMUM,
MDP". TAPS SHALL COMPLY WITH NEC 240.21(B) UTILIZING LISTED CONNECTORS.
PROVIDE TAPS IN FEEDER FROM ATS-1 FOR FEEDERS TO EXISTING PANELS "PP-1" AND "D0222
PROVIDE 36"x36"x8" NEMA 3R JUNCTION BOX SECURELY MOUNTED TO BUILDING EXTERIOR. 44
KEYED NOTES: X
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