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General Provisions (00100-00999)

204BORROW AND FURNISHED EXCAVATION

IL · 2022 Standard Specifications✓ Full text on BuildSpecBook pages 101–104 Save this section

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Art. 204.01 Borrow and Furnished Excavation SECTION 204. BORROW AND FURNISHED EXCAVATION

204.01 Description. Borrow excavation and furnished excavation shall

consist of excavating suitable and/or restricted-use materials obtained from locations approved by the Engineer and transporting the materials to various locations throughout the limits of the contract.

204.02 Furnished Excavation and Borrow Pits. The Contractor shall

furnish and pay for all borrow sites or other sources of excavation and obtain from the property owners the necessary agreements for the removal of the material. Neither borrow nor furnished excavation shall be placed in the embankment until the site location, excavation plan, and material have been approved by the Engineer in writing. The material used shall be suitable or restricted-use according to

Article 1009 — 04.

At the Contractor’s option, commercial borrow sites may be used. When commercial borrow sites are used, the following conditions will not be required. Under no condition shall borrow sites detract from the appearance of the natural topographic features nor increase the potential hazard to a vehicle that has inadvertently left the roadway. In selecting sites for borrow acquisition, preference shall be given to knobs, hills and rises to reduce the extent of pit development. No portion of any borrow pit shall be located within 50 ft (15 m) or 10 ft (3 m) plus 1 1/2 times the depth of the excavation, whichever is the greater, from any highway right-of-way, except when borrow is obtained above pavement elevation. In order to ensure an aesthetically acceptable borrow site, the steepest slopes used in excavating borrow shall be 1:4 (V:H). Borrow pits shall not change the general pattern of existing drainage and shall be well drained unless suitable for development as ponds or lakes. Pertinent drainage information shall be shown on the excavation plan or topographic map submitted by the Contractor. Where the Contractor proposes a borrow site, any portion of which is located within 150 ft (45 m) of any highway right-of-way, the Contractor’s request for approval shall be accompanied by a topographic map showing the original and the proposed final conditions of the entire borrow site. The topographic map shall be drawn to a minimum horizontal scale of 1:500, and 2 ft (600 mm) contour intervals shall be indicated. When a borrow pit is to be developed as a pond or lake, the Contractor shall submit to the Engineer a written statement from the owner that such a development is planned. Slopes of 1:4 (V:H) shall be provided along the periphery of the shoreline. Slopes of 1:2 (V:H) will be permitted below a point where the proposed water depth will be 8 ft (2.5 m) or greater. In cases where a dam is necessary to impound water within a borrow pit to be used as a pond, slopes of 1:3 (V:H) will be permitted on the water face of the dam. Seeding will not be required below the proposed water elevation. Borrow sites shall be seeded according to Section 250. The class of seeding and the application rate of fertilizer nutrients and/or agricultural ground limestone will Borrow and Furnished Excavation Art. 204.06 be determined by the Engineer. If the proposed borrow site is to revert to agricultural purposes, the Contractor shall submit to the Engineer a written statement from the owner that seeding will not be required. All work in connection with seeding at borrow sites will not be paid for separately. After the borrow site excavation is completed, the Contractor shall shape the borrow site to conform to the approved topographic map.

204.03 Materials. Materials shall be according to the following.

Item Article/Section

a.Steel Based Plate .............................................................................. 1006.04
b.Steel Pipe .......................................................................................... 1006.18
c.Threaded Malleable Iron Floor Flanges ............................................. 1006.16
d.Soil and Other Materials for Embankments, Fills, and Subgrades ..... 1009.04 All materials furnished to construct settlement platforms will be visually inspected by the Engineer at the job site prior to installation and no other inspection or certification will be required. CONSTRUCTION REQUIREMENTS

204.04 Clearing, Tree Removal, and Protection of Existing Plant Material.

Before any material is excavated from a borrow pit, clearing, tree removal and protection of existing plant material over the area included within the limits of the pit shall be performed according to Section 201.

204.05 Excavation. Excavation throughout the borrow pit area shall be as

uniform as possible. Upon completion of the excavation operations, all stumps and roots shall be cut off and disposed of according to Article 202.03, and the pits shall be trimmed and cleaned. Soils that are unstable according to Article 1009.04 shall be rendered stable or declared unsuitable by the Engineer according to Article 202.05.

204.06 Settlement Platforms. When called for on the plans or should the

Contractor request credit for the placement of any additional embankment due to possible settlement during construction, settlement platforms shall be erected at the locations shown on the plans or as directed by the Engineer and as hereinafter specified. Notification by the Contractor shall be made to the Engineer in writing prior to the start of construction. The settlement platforms shall be placed on natural soil, where practical, after the roadway area has been cleared, disked and compacted. Compacted granular bedding material up to 6 in. (150 mm) thick may be used to properly seat the platform. Granular material to be used for bedding may consist of any fine aggregate meeting the approval to the Engineer. The subgrade or bedding shall be prepared and leveled in such a manner that the platform makes uniform contact. A 3/4 in. (19 mm) diameter steel pipe shall be attached to a 1/8 in. (3 mm) thick by 4 ft (1.2 m) square steel plate with a threaded malleable iron floor flange welded to Art. 204.06 Borrow and Furnished Excavation the plate. 4 ft (1.2 m) lengths of 3/4 in. (19 mm) diameter pipe shall be added as the height of the embankment increases. The tip of the grade pipe shall at no time extend more than 4 1/2 ft (1.4 m) or less than 6 in. (150 mm). The Contractor shall exercise extreme caution when placing material adjacent to the settlement plates and no equipment shall pass within 5 ft (1.5 m) of the settlement plate until the height of fill is 3 ft (1 m) above the plate. A casing of 2 1/2 in. (64 mm) diameter steel pipe (standard) shall be installed around the vertical pipe. Settlement platforms shall be maintained by the Contractor in the required positions at all times during the construction of the embankment. All movement or disturbance, other than normal settlement, of the settlement platforms shall be immediately corrected by the Contractor by repairing or replacing them as directed by the Engineer. All extensions to the grade pipes shall be added under the supervision of the Engineer. Settlement readings will be taken by the Engineer as required throughout construction of the embankment. The final readings will be taken after the top grade of the embankment has been constructed and has been approved by the Engineer. When the settlement platform has served its purpose, the pipe extensions shall be removed to at least 2 ft (600 mm) below subgrade, the pipe capped, and the area backfilled and compacted.

204.07 Method of Measurement. Borrow excavation will be measured in its

original position by taking cross sections before the work is started and again after it has been completed. The volume, in cubic yards (cubic meters), of material moved will be computed by the method of average end areas. Furnished excavation will be measured for payment as follows.

a.Contract Quantities. The use of contract quantities shall conform to the requirements of Article 202.07(a) and to the following.
1.If the Contractor so requests, the Engineer will reestablish the existing ground line after the clearing and tree removal over the entire embankment areas have been performed according to Section 201 and the top 6 in. (150 mm) of the existing ground surface has been disked and compacted according to Article 205.03. Contract quantities will be recalculated based on the difference between the existing ground line shown on the plans and the new ground line established after the clearing, disking and compacting.
2.If settlement platforms are erected according to Article 204.06, the Engineer will reestablish the existing ground line after the embankment is complete from elevations taken on the grade pipes of the settlement platforms. In reestablishing the existing ground line, no change in elevation from that shown on the plan cross sections will be assumed to have occurred at the intersection of the embankment side slopes and the existing ground. Contract quantities will be recalculated based on Embankment Art. 205.02 the difference between the existing ground line shown on the plans and the new ground line established from the settlement platforms.
b.Measured Quantities. Furnished excavation will be computed for payment in cubic yards (cubic meters) as follows. Furnished Ex. = Embankment - [Excavation x (1 - Shrinkage Factor)] Where: Embankment = the volume of fill in its final position computed by the method of average end areas and based upon the existing ground line as shown on the plans, except as noted in (1) and (2) below; Excavation = suitable and/or restricted-use excavation such as earth excavation, rock excavation, and other on-site excavation acceptable for use in embankments as shown in the Earthwork Schedule on the plans; Shrinkage Factor = 0.25 unless otherwise shown on the plans.
1.If the Contractor so requests, the Engineer will reestablish the existing ground line after the clearing and tree removal have been performed according to Section 201 and the top 6 in. (150 mm) of the existing ground surface has been disked and compacted.
2.If settlement platforms are erected, the Engineer will reestablish the existing ground line after the embankment is complete as specified in

Article 204 — 07(a)(2).

The quantity for furnished excavation will not be recalculated when surplus, suitable or restricted-use materials are utilized in embankments according to

Article 202 — 03.

204.08 Basis of Payment. Borrow and furnished excavation will be paid for

at the contract unit prices per cubic yard (cubic meter) for BORROW EXCAVATION and FURNISHED EXCAVATION. SECTION 205. EMBANKMENT

205.01 Description. This work shall consist of the construction of

embankments by depositing, placing, and compacting earth, stone, gravel, sand, or other materials of acceptable quality above the existing ground or other surface.

205.02 Equipment. Equipment shall be according to the following.

Item Article/Section

a.Disk Harrow ....................................................................................... 1101.02

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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 101–104 of 1,217. View official source ↗

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