AMENDMENT LANGUAGE.pdf
PDF 401 KB Posted
- Attached to
- P1394 PHASE B VEHICLE MAINTENANCE AND STORAGE, MARINE CORPS BASE, CAMP LEJEUNE, NORTH CAROLINA
- Solicitation number
- N4008522R2639
About this file
This amendment modifies the language of a previous drawing for a sediment removal project within a wetland system. Mechanical equipment will be permitted to remove sediment, with mats or planks used to prevent impacts. Once the bulk sediment is removed, any remaining thin layer must be removed by hand. Vegetation up to two inches in diameter can be cut, and dead trees removed, without disturbing roots. Sediment removal should proceed from the top of the system toward the bottom outlet. Coir fiber logs will be placed and allowed to disintegrate over time to stabilize the site and prevent sediment movement. In areas not accessible by equipment, sediment must be removed by hand and transported mechanically. The site will require inspection and approval before seeding with rye or wetland mix, or allowed to naturally regenerate depending on the project completion time frame. Perpendicular slopes will also be seeded to hasten stabilization.
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Text version
Amendment Language
Drawing CS501
Note 3 is Deleted in its entirety and replaced with the following:
3. Due to the amount of sediment that is within the wetland system, the use of small mechanical equipment will be allowed in its’ removal. Paths to the top of the slope perpendicular to the wetlands will be allowed to assist in the transport of sediment to designated spoil area(s) away from the wetlands to prevent the sediment from re-entering the wetlands. These paths should be spaced out as necessary.
Types of equipment could include, Georgia buggies, small track hoes, etc. The contractor can use mechanical equipment within the wetland areas to scoop out sediment with the stipulation that pallets, timber planks and/or forestry mats must be used in areas to prevent any equipment from bogging down and/or causing additional impacts. Once the mechanical equipment has excavated sediment to the point that only a thin layer is remaining (2-6”), the remaining sediment needs to be removed to the original surface by hand using rakes, shovels and buckets.
Vegetation up to a 2” diameter within the system may be cut to the ground, but no root disturbance is allowed. Dead trees can also be cut to the ground without root disturbance and removed from the site and disposed of as appropriate.
The task of sediment removal should be done from the top of the system, where the stormwater pond failed, towards the bottom of the system, where it outlets into the stream. The Division of Water Resources has flagged the extent of the removal with yellow/greenish flagging. Coir fiber logs shall be placed every couple hundred feet or within areas to keep the sediment from moving further. Once the sediment has been removed, coir fiber logs shall be re-established to help stabilize the system, capture any moving sediment and allowed to disintegrate over time.
In areas, where the equipment cannot work without causing additional impacts, the sediment in those areas should be removed by hand using rakes, shovels and buckets and the sediment can be transported up the slope via the small machines collecting the sediment at the edge of the wetlands.
Prior to seeding, the site needs to be inspected by the environmental branch and this may include the regulating agencies for compliance.
Depending on the time of year the project is completed, rye seed or wetland seed mix may be used to help stabilize the area. If the completion time is closer to spring or summer, direction from the agencies may allow the area to regenerate vegetation on its’ own. The perpendicular paths should also be seeded to hasten the stabilization of the slopes.
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