- 700 - SECTION 820 -- TURBIDITY BARRIER
820.01 Description
1.Turbidity barriers consist of a heavy duty reinforced fabric attached on the upper side to floatation members and ballasted on the lower side with chains or weights to form a bo ttom-tensioned floating curtain boom.
820.02 Material Requirements
1.The products used for turbidity barriers shall be shown on the Department’s Approved Products list.
2.Anchors shall be capable of holding the floating basin boom in place.
3.Prior to installation, the contra ctor shall provide an installation guide to the Engineer.
820.03 Construction Methods
1.Turbidity barriers shall be insta lled at the locations shown in the contract or as directed by the Engineer.
2.Installation shall be as recommended by the manufacturer for the intended application.
3.The Contractor shall maintain t he turbidity barrier in good working condition at all times.
4.Prior to the completion of the pr oject, the Contractor shall remove the turbidity barrier and it will become the property of the Contractor.
820.04 Method of Measurement
1.Turbidity barriers will be measured by the length in place.
2.The measurement will be taken along the top line of the boom.
3.Maintenance, repair and removal of the turbidity barrier will not be measured for payment, but considered su bsidiary to the item of Turbidity Barrier.
820.05 Basis of Payment
1.P a y I t e m P a y U n i t Turbidity Barrier Linear Foot (LF)
2.Payment is full compensation for all work described in this section. - 701 - SECTION 821 -- TEMPORARY SLOPE DRAIN
821.01 Description
1.This work consists of constructing slope drains with any type of new or used, rigid or flexible pipe that will adequately carry the water from the top of the slope to the ditch to prevent erosion on the slope.
821.02 Construction Methods
1.Temporary slope drains shall be sized to carry the anticipated volumes of flow. The diameter of the pipe shall be as shown in the contract or as directed by the Engineer.
2.The length of pipe shall be approved by the Engineer. 3. Stormwater shall be channeled into the temporary slope drain inlet. 4. Temporary slope drains shall be placed without bedding requirements.
5.Temporary slope drains shall be securely anchored at the inlet, outlet and along the slope.
6.Velocity dissipation devices s hall be placed at the temporary slope drain outlet to prevent erosion.
7.The Contractor shall maintain the temporary slope drain in good working condition at all times. Good working condition includes anchoring repair, and repositioning of the inlet or outlet at the original installation.
8.Upon completion of the final erosion control measures, the temporary slope drain shall be removed from the project.
821.03 Method of Measurement
1.The temporary slope drain will be measured in linear feet along the longitudinal axis of the pipe.
2.Maintenance and repair of the temporary slope drain will not be measured for payment, but will be considered subsidiary to the item of Temporary Slope Drain.
3.Removal of the temporary slope drain will not be measured for payment, but will be considered subsidiary to the item of Temporary Slope Drain. All material shall remain the pr operty of the Contractor and removed from the site.
4.Velocity dissipation devices will not be measured for payment.
821.04 Basis of Payment
1.P a y I t e m P a y U n i t Temporary Slope Drain Linear Foot (LF)
2.Velocity dissipation devices shall be subsidiary to the temporary slope drain.
3.Payment is full compensation for all work described in this section.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 734–734 of 1,048.