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Electrical (16000-16999)

207001 PIPE, CULVERT AND STRUCTURE BACKFILL ING CY

DE · 2025 Standard SpecificationsBook pages 131–134View official source ↗

STRUCTURAL EXCAVATION AND BACKFILLING SECTION 207 121 4. Structural and pipe backfilling at the contract unit price per cubic yard. The Department will consider that price and payment as constituting full compensation for placing and compacting all approved backfill.

B.The Department will not pay for rock excavation that is more than 12 -inches below the pipe

invert. The Department will not pay for backfill or backfilling areas between the over excavated subgrade and 12 -inches below the proposed pipe invert.

C.When the engineer requires extra depth excavation beyond the prescribed limits, the Department

will pay the unit price plus the additional percentage according to the pay limits provided in Table 207.5 -1 below. Table 207 .5 -1. Payment for Additional Excavation Depth Depth Lowered Additional Percent More Than (feet) Not Over (feet) 0 5 25 5 8 60 8 10 100

ITEM DESCRIPTION UNIT 207001 PIPE, CULVERT AND STRUCTURE BACKFILLING CY 207002 PIPE, CULVERT AND STRUCTURE EXCAVATION CY 207010 ROCK EXCAVATION FOR STRUCTURES AND TRENCHES CY 207011 ROCK EXCAVATION FOR STRUCTURES AND TRENCHES (FIXED PRICE) CY 20702 0 STRUCTURAL BACKFILL, BORROW TYPE B, PROVIDING ONLY CY 20702 1 STRUCTURAL BACKFILL, BORROW TYPE C, PROVIDING ONLY CY FLOWABLE FILL SECTION 208 122 SECTION 208 — FLOWABLE FILL

208.1Description.

This work consists of providing and placing flowable fill.

208.2Materials.

A.Flowable Fill Section 1047 .1

B.Mortar Section 104 7.6

C.Submit material sources to the engineer at least 30 calendar days before use.

D.Submit material test data of fly ash, representative of the source, to the engineer at least 30

calendar days before use. Include test data characteristics of the ash leachate as determined by the Toxicity Characteristics Leaching Procedure (TCLP) in acc ordance with EPA SW -846, with respect to leachate metals.

208.3Construction.

208.3.1 Plant and Equipment Requirements. Provide flowable fill produced only in batching plants in accordance with Section 1022.

2 Transportation

Transport flowable fill in ready -mix trucks or as approved by the engineer. Place the flowable fill within 3-hours of mixing water with the dry materials.

3 Placement

A.Plug downstream pipe end with brick and mortar. Flowable fill the pipe in such a way that both

ends of the pipe are sufficiently plugged upon completion of the work .

B.Place flowable fill only when the ambient temperature is a minimum of 40 degrees F and rising.

C.Place when the temperature of the flowable fill is no less than 50 degrees F.

D.Do not place flowable fill against frozen surfaces.

E.Protect flowable fill from freezing for at least 36 -hours in accordance with Section 501.3.6.

F.Discharge fill at a rate that allows the material to:

1.Flow into the placement location;

2.fill all voids; and

3.not dislodge the existing containment or interior items.

G.Ensure that all interior items can withstand the lateral hydraulic pressures of the flowable fill. The

maximum allowable lift is 5 -feet deep unless otherwise directed by the engineer. Allow each lift to cure until it is self -supporting before placing additional lifts or other loads.

H.Take care to prevent pipes from floating with the use of straps, soil anchors, or other approved

means of restraint required to ensure proper alignment when using flowable fill as backfill for pipes. FLOWABLE FILL SECTION 208 123 I. Maintain all confining and supporting structures, protective covers, and barriers until the flowable fill is self -supporting. Shrinkage of the flowable fill as it cures may require additional backfill with other material. Protect flowable fill from direc t contact with vehicular traffic and from prolonged exposure to rain or running water.

208.4Method of Measurement.

A.The Department will measure the number of cubic yards of material accepted and placed within

the approved limits of the fill location. The Department will measure pipe trenches in accordance with Section 207.4.

B.The engineer will measure flowable fill for abandoned structures by the truck in accordance with

208.5Basis of Payment.

The Department will pay for flowable fill at the contract unit price per cubic yard. Price and payment will constitute full compensation for:

A.Providing flowable fill mixture materials and designing, mixing, and hauling the flowable fill;

B.preparing the fill;

C.anchoring items within the fill; and

D.protecting and curing the fill after placement.

ITEM DESCRIPTION UNIT 208000 FLOWABLE FILL CY BORROW SECTION 209 124 SECTION 209 — BORROW

209.1Description.

This work consists of providing and placing borrow material from approved offsite borrow sources.

209.2Materials.

Borrow Section 1001

209.3Construction.

209.3.1 Borrow Sources.

A.Provide an offsite borrow source.

B.Notify the Department’s Materials and Research Section at least 10 working days before removing

material from an offsite borrow source. Submit a description of the approved material limits within the offsite borrow source and the method of excavation for a pproval by the Department’s Materials and Research Section.

C.Clear and grub the ground surface at the offsite borrow site in accordance with Section 201.

D.Strip off unsuitable material, as determined by the engineer, before excavating borrow.

E.The Department will not allow borrow excavation within 100 feet of the right -of-way lines without

the engineer’s written permission.

F.Submit a physical control plan to the engineer after the Department has tested and approved the

borrow source, and removed the overburden. Implement the physical control plan and obtain approval before the Department cross -sections the source. Control m ethods may include fencing, earth berms, guardrails, or other physical barriers. If the offsite borrow source is fenced, provide a padlocked gate at the entrance. The Department will retain the padlock key.

G.Upon completion of the offsite borrow excavation, leave the offsite borrow area in a condition

that allows accurate measurement. Prevent water from collecting or standing within the excavated borrow area. 209.3.2 Source Testing. The Department will assist the contractor in determining the quality and quantity of material from sources the contractor proposes to use. The Department will perform soil analysis tests. The Department will sample and test the offsite borrow source. 209.3.3 Borrow Placing and Compacting. Place and compact borrow in accordance with Section 202.3.8. 209.3.4 Providing Borrow for Utility Backfill.

A.When providing backfill material for utility trenches, stockpile materials at locations mutually

agreed to by the contractor, the utility, and the engineer.

B.Coordinate the operation of backfilling utility trenches with the utility organizations. The utility

organizations involved will backfill utility trenches in accordance with Section 202.3.8. The Department will not require proof rolling.

Source: Delaware Standard Specifications for Road and Bridge Construction, 2025 Edition. Pages 131–134 of 779.

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