- 690 - SECTION 814 -- EARTH AND ROCK CHECKS
814.01 Description
1.This work consists of constr ucting earth and rock checks at the locations shown in the contract, Temporary Erosion Control Plans or as directed by the Engineer.
814.02 Material Requirements
1.Earth or rock may be used for the checks.
814.03 Construction Methods
1.The Contractor shall construct the checks with material located on the project or from locations as approved by the Engineer. The check shall be compacted with the equipment used to build it.
2.Locations a. Checks shall be built to th e dimensions as shown in the contract, or as directed by the Engin eer. The limits of the completed checks shall extend up the foreslope and ba ckslope of the ditc h to effectively contain the run-off and prevent erosi on and washout at the edges of the installation.
b.Checks used as a perimete r control shall be installed as needed to contain runoff, but shall not extend more than 6 feet beyond the Limits of Construction as shown in t he contract unless otherwise directed by the Engineer.
3.Earth and Rock Checks a. The checks shall be instal led immediately after the rough grading or other soil disturbance activi ties are completed on a portion of the project.
b.The checks shall be left in pl ace until the finish grading begins. Reinstall the checks as soon as fini sh grading is completed unless the permanent erosion control is initiated immediately after finish grading.
c.Checks used adjacent to wetlands, waterways and “Sensitive Areas” shall include a secondary BMP to prevent discharge of the check material.
4.The Contractor shall remove and dispose of sediment that accumulates behind the checks during construction and at completion of the project.
a.Sediment removal shall be initiated when sediment depth has reached one-half the height of the checks or as directed by the Engineer in conjunction with checks repairs.
b.Each time sediment is removed, the checks shall be repaired to a good working condition. Good working condition includes: repair of washouts, compaction of materials, and any associated handwork.
5.When the checks are determined to be no longer functional or needed, they shall be removed.
a.The earth shall be removed and may be incorporated with the finish grading, as determined by the Engineer. Earth and Rock Checks 814.05 - 691 - b. The rock shall be removed and taken to other places on the project where rock is required, incorporated into the project at designated locations, or salvaged as directed by the Engineer.
814.04 Method of Measurement
1.All work involved in construc ting checks as described above will be included and paid for per linear f eet of devices used in the checks.
2.Earth and Rock Checks shall be measured by the linear foot (meter) for the initial installation.
3.Removal of sediment and repair of checks will be measured based on equipment rental.
814.05 Basis of Payment
1.P a y I t e m P a y U n i t Temporary Earth Check Linear Foot Temporary Rock Check Linear Foot Rental of Skid Loader, Fully Operated Hour Rental of Loader, Fully Operated Hour Rental of Crawler Mounted Hour Hydraulic Excavator, Fully Operated Rental of Dump Truck, Fully Operated Hour Rental of Backhoe, Fully Operated Hour 2. All incidentals associated with the cleanout shall be subsidiary to the equipment rental items.
3.Payment is full compensation for all work described in this Section. - 692 - SECTION 815 -- SILT TRAP
815.01 Description
1.This work consists of the cons truction, maintenance and removal of silt traps. A silt trap is a shallow exca vation constructed in a drainage path to dissipate energy, induce sediment deposition and provide temporary storage.
815.02 Construction Methods
1.The silt trap shall be approximat ely 1 foot deep and of varying width and length. The shape should be rectangular with the longer dimension parallel to the flow of water. The size , shape and location of the silt trap shall be as shown in the contract or as directed by the Engineer.
2.Construction of the silt trap s hall be accomplished by methods and equipment suitable for the purpose and acceptable to the Engineer.
3.The initial excavated material fr om the construction of the silt trap shall be incorporated into the grade or placed as directed by the Engineer.
4.The silt trap shall be cleaned when at 50% capacity by removal and disposal of the silt to maintain functi onality. Sediment removed from the silt trap shall be deposited in an upland location.
5.The silt trap shall be removed w hen it is deemed of no further use by filling the area with soil and shaping to blend with the adjacent natural ground.
815.03 Method of Measurement
1.Silt trap construction will be measured based on equipment rental.
2.Silt removal will be meas ured based on equipment rental.
3.Silt trap removal will be measured based on equipment rental.
815.04 Basis of Payment
1.P a y I t e m P a y U n i t Rental of Skid Loader, Hour Fully Operated Rental of Loader, Hour Fully Operated Rental of Crawler Mounted Hour Hydraulic Excavator, Fully Operated Rental of Dump Truck, Hour Fully Operated Rental of Backhoe, Hour Fully Operated
2.Payment is full compensation for all work described in this Section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 724–725 of 1,048.