- 153 - SECTION 301 -- GENERAL REQUIREMENTS
301.01 General
1.Compaction requirements are shown in the contract.
2.The Contractor shall be responsi ble for the repair and restoration of any roadbed damage, loss of stability, or rutting caused by the hauling operations.
3.Maintenance of the granular f ill, base course, foundation course, and subgrade for both roadway and shoulders shall be the responsibility of the Contractor until overlying pavement is complete and accepted by the Engineer. This maintenance shall be cons idered subsidiary to the items for which direct payment is provided.
301.02 Equipment
1.Operation:
a.All equipment shall be kept in satisfactory working condition.
b.Equipment shall be operated within the manufacturer's specifications.
c.The Contractor shall perfo rm the tests and calibrations on all equipment. In the event problems are encountered during the tests and calibrations, the Contractor shall arrange for a trained technician or company representative to make the necessa ry repairs or adjustments to the equipment. Calibrations shall be made as often as is deemed necessary by the Engineer, at no additional cost to the Department.
2.The hauling equipment shall consist of trucks equipped for dumping material into spreader boxes or in a windrow. They shall be constructed and maintained to prevent loss of materials during hauling operations.
3.Water Distributors:
a.The distributor equipment sh all provide accurate and uniform distribution of water. The control valves shall close fully to prevent leakage.
b.Water will be measured through a meter or with calibrated tanks in gallons (liters). The weight of the water can also be measured and converted to Megagallons (kiloliters).
4.The equipment used for profiling the subgrades, base courses, and foundation courses shall be capable of meeting Construction Methods.
5.Only compacting equipment and methods which will consistently produce the compaction specified thro ughout the depth of the compacted lifts shall be used. Compacting equipment which produces laminations within the compacted lifts will not be allowed.
6.Equipment used to spread the material shall be capable of distributing the material uniformly.
7.Equipment for weighing loaded trucks shall comply with requirements given in Subsection 503.03. - 154 - SECTION 302 -- SUBGRADE PREPARATION, SHOULDER SUBGRADE PREPARATION, AND PREPARATION OF INTERSECTIONS AND DRIVEWAYS
302.01 Description
1.The Contractor shall complete the following requirements under the "Subgrade Preparation" or “Preparation of Intersections and Driveways” bid item:
a.(1) Furnish and place subgrade materials as shown in the contract.
2.Bring the roadbed to the plan profile when the following conditions are met:
i.The roadbed was graded under a separate contract or an existing grade. (ii) The grade is less than 0.20 foot (60 mm) low. (iii) The material is available on the right-of-way within the minimum free haul distance specified in Section 209.
b.Adjust grade lines to meet intersections, pavements, bridge ends, railroad crossings, or any other physical features designated by the Engineer.
c.Lower the grade, if necessa ry, to provide adequate width.
d.Dispose of surplus, excavated material within the right-of-way or the free haul distance.
e.Scarify, mix, adjust the moisture content, shape, and compact the soils as necessary to conform to the contract.
2.Under the bid item "Should er Subgrade Preparation", the Contractor shall complete, the adjustmen t of the shoulder elevations and the construction of the earth portion of the shoulder outside the surfaced shoulder width to conform to the typical cross sections shown in the contract, in addition to the above requirements for "Subgrade Preparation".
302.02 Material Requirements
1.Soils shall meet the requireme nts described in Subsection 205.02.
302.03 Construction Methods
1.The Contractor shall shape t he subgrade to the typical cross sections shown in the contract. In t he event the subgrade width is less than the width shown on the typical cross sections, the widening shall be accomplished by either:
a.Lowering the grade. b. Placing additional embankment on the shoulder slopes. 2. Embankments will be constructed in accordance with Section 205.
a.Widening by placement of additional embankment material on the shoulder slopes to provide the minimum width will be allowed only if the existing slope is 1 vertical to 4 horizontal or flatter.
b.After placing, shaping, and compacting the material, the slope shall be no steeper than the slope shown in the contract.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 187–187 of 1,048.