DOT_Trenching_and_Backfilling.pdf
PDF 512 KB Posted
- Solicitation number
- IFB# 26-014
- Issued by
- New London County, Connecticut
About this file
This is a technical standard sheet document issued by the Connecticut Department of Transportation (CTDOT) that establishes specifications for trenching and backfilling procedures related to electrical conduit installation. The document provides detailed engineering guidance for the proper excavation, placement, and restoration of trenches containing communication cables and related infrastructure. The specifications cover conduit depth requirements (minimum 24 inches), backfill compaction procedures (6-inch lifts using power compaction), warning tape placement, identification post installation with numbered signage, and restoration protocols for disturbed areas. The standard sheet applies to work performed across Connecticut's transportation infrastructure and references CTDOT Standard Specifications sections for additional requirements including concrete sidewalk replacement, seeding in mowed areas, and utility protection measures.
The document establishes mandatory technical requirements for contractors performing trenching work on state transportation projects, including specific material standards such as detectable warning tape in orange (for communication) and red (for power), identification posts constructed from 4-inch by 4-inch pressure-treated wood positioned approximately 24 inches from rigid metal conduit (RMC), and concrete or asphalt overlay specifications to match existing pavement thickness. Contractors must comply with the Call Before You Dig hotline (1-800-922-4455) prior to excavation and follow detailed protocols for crossing existing utilities beneath grade. The standard sheet was submitted and approved by CTDOT's Office of Engineering and is effective as of January 23, 2024, with final approval dated February 21, 2024. This specification applies to the Town of Waterford's water service replacement project on Rope Ferry Road and establishes binding technical requirements for all qualified licensed contractors bidding on related infrastructure work in Connecticut.
View the file
Other files
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
CT DOT
COMMUNICATION
CONDUIT
BURIED BELOW
CALL BEFORE
YOU DIG
1 - 800
922 - 4455
XX
OW
SAND
BEVELED END
GROUND LINE
CONDUIT
SAND BACKFILL LEVEL
SUITABLE BACKFILL
SIGN FACE DETAIL
INTERCONNECT TYPICAL CURB CROSSING
M
IN
M
IN
NOTES:
1. RESTORE AREAS DISTURBED BY TRENCH TO ORIGINAL CONDITION.
CONDUIT
NOTES:
1. 4" x 4" NOMINAL, PRESSURE TREATED WOOD POST.
NYLON WASHER ON FACE OF SIGN.
IS GREATER THAN 1500' APART.
36" (MIN)
10' (MIN)
36" (MIN)
6"
2" (MIN)
1¼"
1½"
SIGN FACE ON ALL FOUR SIDES
ATTACH NUMBERS TO SIDE OF POST FACING CONDUIT.
TO TRENCH CONTAINING COMMUNICATION CABLE.
2¾" (TYP)
⅜" (TYP)
½" (TYP)
4" MIN
8" MIN
24"
MAX
12"
T
O
SIGN # 41-4669
4" MIN.
SAW CUT EDGE
6" TO 12"
SAW CUT EDGE
CONDUIT
CONCRETE OVERLAY
EXISTING BITUMINOUS
EXISTING BITUMINOUS OR PCC PAVEMENT
EXISTING BITUMINOUS
T
O
CONCRETE OVERLAY
BEDDING MATERIAL OR SAND
1. TOTAL HOT MIX ASPHALT (HMA) THICKNESS TO MATCH EXISTING BITUMINOUS
SAW CUT EDGE, TACK COAT, AND
SEAL JOINT AFTER PAVING. (TYP)
EXISTING GRADE
2. ATTACH SIGN TO POST WITH ¼" x 1¼" STAINLESS STEEL LAG SCREW WITH
4. INSTALL POST APPROX 24" FROM RMC IN VICINITY OF EACH INTERCONNECT HANDHOLE.
5. INSTALL ADDITIONAL POST(S) WHERE SPACING BETWEEN INTERCONNECT HANDHOLES
6. PERMANENTLY ATTACH STAINLESS STEEL NUMBERS INDICATING DISTANCE IN FEET
SEE NOTE 6 3"
UNDER EXISTING UTILITYCROSSING
30" MAX TYP
CAUTION - CABLE BURIED BELOW
NOTE:
EXISTING UTILITY PIPE OR CONDUIT
NOTES:
DETECTABLE WARNING TAPE
8" MIN.
12" MIN.
NOTES:
CONCRETE AND PORTLAND CEMENT CONCRETE (PCC) THICKNESS.
2. WHEN ALLOWED BY ENGINEER, USE CONTROLLED LOW STRENGTH MATERIAL (CLSM)
AS BEDDING MATERIAL. TOP OF CLSM SHALL BE AT LEAST 20" BELOW SURFACE.
SIDEWALK EARTH
NOTES:
1. IN MOWED AREAS: PLACE TOPSOIL, FERTILIZER, SEED, & MULCH.
4" MIN
REFER TO NOTE 1
GENERAL NOTES:
1. TOP OF CONDUIT AT LEAST 24" DEEP.
2. COMPACT BACKFILL IN 6" LIFTS.
1. WHEN ENCOUNTERED AT APPROXIMATELY THE SAME
DEPTH, CROSS BENEATH.
INTERCONNECT CONDUIT
STANDARD SPECIFICATIONS, SECTION 9.50 OR SEEDING TYPE CALLED OUT ON THE PLANS.
DETECTABLE WARNING TAPE
COMMUNICATION - ORANGE BACKGROUND / BLACK LEGEND
STANDARD SPECIFICATIONS, ARTICLE: 1.05.15
1. TAPE COLORS:
2. PROTECT & SUPPORT EXPOSED EXISTING UTILITY.
HAND COMPACTION NOT PERMITTED.
POWER - RED BACKGROUND / BLACK LEGEND
IDENTIFICATION POST
LEGEND - BLACK (OPAQUE).
3. SIGN COLORS: BACKGROUND - ORANGE (RETROREFLECTIVE)
DETECTABLE
WARNING TAPE
OVERLAYED PORTLAND CEMENT CONCRETE
PAVEMENT - BITUMINOUS CONCRETE OR
12" 12"
BE 4"
MINIMUM COMPACTED PAVEMENT THICKNESS SHALL
S0.375 TRAFFIC LEVEL 2 IN MULTIPLE 2"-3" LIFTS
MATCH EXISTING PAVEMENT THICKNESS USING HMA
COMPACTED IN 4" LIFTS
PROCESSED AGGREGATE BASE MATERIAL
TRANSVERSE ENDS OF THE TRENCH
TRAFFIC LEVEL 2, AND SAWCUT
TRAFFIC LEVEL 2, OR 2" HMA S0.5
MILL 2" THEN PLACE 2" HMA S0.375
TACK COAT EDGES (TYP.)
SAND
WARNING TAPE
SUITABLE BACKFILL
CONDUIT
24"
MAX
8" MIN
4" MIN
T
O
12"
SIDEWALK
NOTES:
1. WHERE CONCRETE SIDEWALK IS DAMAGED OR CUT, REPLACE THE
ENTIRE SECTION BETWEEN JOINTS. REPLACEMENT SIDEWALK IS
PAID FOR UNDER THE ITEM "CONCRETE SIDEWALK".
STANDARD SPECIFICATIONS, SECTIONS 9.21 & 9.22
DETECTABLE
COMPACTED IN 4" LIFTS
GRANULAR FILL SHALL BE
8"
STANDARD SPECIFICATION, SECTION 3.04 AND STANDARD SPECIFICATION, ARTICLE 4.06.03
STANDARD SHEET TITLE: STANDARD SHEET NO.:
CONNECTICUT
D E
P A
R T
M E
N T
O F TRANS
P O
R T
A T I
O N
STATE OF CONNECTICUT
TRANSPORTATION
OF
DEPARTMENT
SIGNATURE BLOCK:
TRENCHING & BACKFILLING, ELECTRICAL CONDUIT
TR-1001_01
NOT TO SCALE
NEWINGTON, CT 06111
2800 BERLIN TURNPIKE
OFFICE OF ENGINEERING
STANDARD SHEET
CTDOT
SUBMITTED BY: APPOVED BY:
LEGEND AS SHOWN ON TRAFFIC CONTROL SIGNAL PLAN:
PROPOSED RMC (RIGID METAL CONDUIT)
SAND
EXISTING RMC (RIGID METAL CONDUIT)
CURB OR EDGE OF ROAD
INTERCONNECT
HANDHOLE
UNPAVED EARTH
22.5°- 48" RADIUS
BITUMINOUS SHOULDER
22.5°- 48" RADIUS 22.5°- 48" RADIUS
22.5°- 48" RADIUS
CONDUIT
CONDUIT
CABLE ITEM.
IDENTIFICATION POSTS WITH SIGNS SHALL BE PAID UNDER THE COMMUNICATION 7.
| 2024-01-23T08:17:40-0500 | |
| Lisa N. Conroy, P.E. |
| 2024-02-21T08:25:47-0500 | |
| Matthew C. Blume, P.E., PTOE |
File details come from the government source that posted it. Updated .