- 688 - SECTION 813 -- MULCH PERIMETER CONTROL
813.01 Description
1.This work consists of grinding and placing slash mulch at locations as shown in the contract or as directed by the Engineer.
813.02 Material Requirements
1.All tree and shrub debris, generated during the clearing and grubbing operations, shall be ground by a mechanical chipper, hammermill, tub grinder, or other approved method.
2.Maximum length of individual pieces shall not exceed 20 inches. Maximum width shall not exceed 2 inches. Material shall be accepted based upon a visual inspection.
3.The Contractor shall be responsible for all labor, materials, equipment and services as may be nece ssary for the generation of the slash mulch.
813.03 Construction Methods
1.Slash mulch berms shall be constr ucted prior to grading activities occurring in the locations noted in t he contract or as directed by the Engineer.
2.Mulch may be placed where mulch perimeter control or low porosity silt fence is indicated in the contra ct. The maximum height of the berm shall not exceed 36 inches.
3.Mulch may be placed where silt checks are indicated in the contract. The maximum height of t he berm shall not exceed 24 inches.
4.In the event that the quantity of mulc h generated exceeds the amount necessary to construct the berms shown in the contract, additional berms shall be constructed as an alte rnative to low porosity silt fence or erosion checks at locations approved by the Engineer.
5.In the event that the quantity of mulch gen erated under runs plan quantity, the Contractor shall place what is produced at locations approved by the Engineer. No off project mulch will be required to be furnished by the Contractor.
6.Upon completion of the project, all slash mulch berms shall be left in place or spread out around the area of their original placement.
813.04 Method of Measurement
1.Slash Mulch-Grinding will be measured by the amount produced after grinding in cubic yards.
2.Slash Mulch-Placement will be me asured by the amount placed in cubic yards.
813.05 Basis of Payment
1.P a y I t e m P a y U n i t Slash Mulch-Grinding Cubic Yard (CY) Slash Mulch-Placement Cubic Yard (CY) 2. Stockpiling and rehandling of material is subsidiary to the Slash Mulch-Grinding item. Mulch Perimeter Control 813.05 - 689 - 3. All labor, materials, equipment and services as may be necessary for the generation of the slash mulch are subsidiary to the slash mulch items.
4.Maintenance of the Slash Mulch berms will be paid with equipment rental.
5.Payment is full compensation for all work described in this Section. - 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.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 722–723 of 1,048.