- 703 - SECTION 823 -- STABILIZ ED CONSTRUCTION EXIT
823.01 Description
1.This work consists of the cons truction, maintenance and removal of stabilized construction exits to minimize the tracking of sediment onto roadways.
823.02 Material Requirements
1.Rock or broken concrete sha ll have a diameter between 2 inches and 4 inches.
2.Filter fabric shall be a Class II Strength Non-Woven Geotextile from the Department’s Approved Products List unless otherwise specified by the Engineer.
3.Pre-fabricated exits may be approved by the Engineer.
4.Tire Wash Systems may be approved by the Engineer. 823.03 -- Construction Methods
1.Stabilized construction exits sha ll be constructed at the locations shown in the contract or on the tempor ary erosion control plans. Changes in locations must be approved by the Engineer.
2.Runoff from stabilized construction exits shall pass through a sediment control device before discharging from the site.
3.The area of the stabilized cons truction exit shall be excavated a minimum of 3 inches and shall be clear ed of unsuitable material that may tear the filter fabric.
a.The filter fabric shall be placed the full width and length of the stabilized construction exit.
b.Pre-fabricated exits shall be installed according to the manufacturer’s recommendations.
c.Tire Wash Systems shall be installed according to the manufacturer’s recommendations.
4.Place rock or broken concrete over filter fabric to at least 6 inches in depth and leave in a roughened condition to dislodge sediment from tires.
5.Stabilized construction exits shall accommodate the largest construction vehicle in length and width that will exit the site.
6.Stabilized construction exits shall be maintained in a condition which will prevent tracking or the flow of sediment onto roadways or into storm drains. Periodic top dressing with additional stone and/or the reworking of existing stone as co nditions demand may be required. Any sediment tracked from vehicles onto roadways must be removed immediately. The use of water trucks to remove sediment from roadways will not be permitted.
7.The locations of all stabilized construction exits on a site will be documented on the temporar y erosion control plan.
8.Prior to completion of the proj ect, the stabilized construction exit shall be removed and the area shall be restored in accordance with the erosion control plans.
823.04 Stabilized Construction Exit
- 704 - 823.04 -- Method of Measurement
1.Only stabilized construction exit s shown in the contract or approved by the Engineer will be measured by the each.
2.No payment will be made for un authorized stabilized construction exits.
3.Top dressing with additional stone or the reworking of existing stone will be considered subsidiary to the pay item.
4.Removal of the stabilized construc tion exit is subsidiary to the pay item.
823.05 Basis of Payment
1.P a y I t e m P a y U n i t Stabilized Construction Exit Each
2.Payment is full compensation for all authorized stabilized construction exits. - 705 - SECTION 824 -- CONCRETE WASHOUT
824.01 Description
1.This work consists of installing concrete washout facilities located on the right of way. Concrete Washout s shall contain concrete waste from cleaning concrete equipment. The wash out facilities shall prevent runoff and leaching of liquids.
824.02 Material Requirements
1.Contractor shall use plastic lining material with at least 10-mil thickness and shall be free of holes, tears or other defects that compromise the impermeability of the material.
2.Prefabricated concrete washout devices must be approved by the Engineer.
824.03 Construction Methods
1.Concrete Washout
a.Concrete washout facilities shall be constructed of sufficient size to contain all liquid and concrete waste generated by washout operations.
b.The contractor shall line the pit with plastic sheeting that has no holes or tears to prevent leaching of liquids into the ground.
c.The soil base shall be prepared to prevent tears or holes in the plastic sheeting material.
d.Concrete washout facilities shall be maintained to provide adequate holding capacity.
e.Constructed washout facilities shall be evaluated during scheduled inspections to ensure that plastic sheeting is intact and sidewalls have not been damaged by construction activities.
2.Concrete washout facilities shall be located a minimum of 50 feet from waters of the state.
3.The Contractor shall furnish, inst all, maintain and remove at no cost to the Department, a “Concrete Washout” sign adjacent to each washout facility.
a.The sign shall be placed in a manner in which it is visible to equipment operators.
4.The location of all concrete washout facilities shall be identified on the Temporary Erosion Control Plan.
5.Existing facilities must be cleaned, or new facilities shall be constructed when the washout is 75% full.
6.When concrete washout facilities are no longer required for the work, the hardened concrete shall be disposed of in accordance with all environmental regulations.
7.Upon completion of the concrete work, all concrete washout facilities shall be removed and the locations restored to the final erosion control requirements.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 737–738 of 1,048.