B08_Solicitation_Attch_1_Statement_of_Work_(SOW).docx

Statement of Work North of Hog Island Gully Tidal Creek Construction May 10, 2023

During the 1990s, the U.S. Army Corps of Engineers created marshes on Sabine National Wildlife Refuge maintenance dredging material from the Calcasieu Ship Channel. Those created marshes adjacent to Hog Island Gully Canal consist of relatively solid unbroken marsh (Figure 1). This Scope of Work consists of tidal creek construction in areas A and B.

Figure 1. Marsh creation areas along Hog Island Gully Canal (2017 image).

Work consists of tidal creek construction as illustrated below (Figure 2) and shall total no less than 18,174 linear feet in distance. As part of the Bid package documents, the contractor will be provided with kmz files (horizontal datum WGS84, vertical datum NAVD88) delineating the locations of these creeks. Using contractor supplied GPS equipment, the contractor shall construct the creeks according to specifications in the locations identified by the kmz files. The physical locations of the creeks will not be staked out or otherwise delineated on the ground.

Figure 2. Part I tidal creek construction layout.

Site condition changes or unknown conditions Because of marsh/landscape changes the contractor shall anticipate that the terminal end of each creek as shown in the provided kmz file may not terminate in open water as illustrated in Figure 2 once field located. In such cases, the contractor shall notify the Contracting Officer of the discrepancy and after government approval, field adjust the beginning of the creek construction such that the downstream end of each creek connects with the water body as shown in Figure 2 and as listed below. Terminus points were staked out in March 2020, but after the 2020 hurricanes, those stakes may no longer be present.

Creek A1 shall terminate in a small pond to the north.

Creek A2 shall terminate in an existing ditch to the north.

Creek A3 shall terminate in a pond to the northeast.

Creek A4 shall terminate in open water to the east.

Creek A5 shall terminate in a canal to the south.

Creek B1 shall terminate in a bayou to the west.

Creek B2 shall terminate in a bayou to the west.

Creek B3 shall terminate in a lake to the north.

Creek B4 shall terminate in a lake to the north.

Creek B5 shall terminate in a lake to the northwest.

Creek B6 shall terminate in an existing tidal creek immediately north of Hog Island Gully Canal.

Creek B7 shall terminate in Hog Island Gully Canal to the south.

Each creek should be constructed 4-foot-wide and 2-foot-deep as shown in Figure 3. Spoil should be placed adjacent to each creek in a staggered pattern and should not be placed higher than 0.75 feet above existing marsh elevation.

Figure 3. Cross-Section of Part I tidal creeks.

Creeks shall be constructed as close to the design specification as possible, and in no case shall the final cross section or overall depth exceed 12 inches of over-dredging (creating deeper creek bottom elevation) without prior written approval from the Contracting Officer. Lengths of individual creeks are provided in Table 1.

Table 1. Lengths of Part I tidal creeks.

Spoil Material Placement The contractor shall dispose of all spoil material onsite by means of mechanically spreading or slinging spoil material on alternating sides of each constructed tidal creek as shown in Figures 3 and 4. Spoil material shall be placed not to exceed 0.75 feet above the existing marsh elevation. The excavator operator shall field fit spoil placement to avoid placing spoil in a manner that would block hydrologic connections between the constructed creek and all prior existing waterbodies (ponds, creeks, ditches, etc.).

Figure 4. Layout of spoil placement of Part I tidal creek construction.

Equipment staging area The contractor shall unload and load the marsh buggy excavator at the north Hog Island Gully parking lot located adjacent to Louisiana Highway 27 (Figure 5). This parking lot is for temporary storage of equipment only and no fuel or petroleum products are to be stored on site.

Site Safety The contractor shall adhere to all state, Federal, and local requirements for construction safety. The contractor shall verify that all on-site personnel meet OSHA construction training requirements based on their activity being performed on site. Contractor shall maintain Job hazard analysis records for each employee performing work at the site. Contractor shall ensure that all staff are required to wear Personal Protective Equipment per the Job hazard analysis and all applicable OSHA requirements. Contractor shall insure all staff on-site adhere to the regulations for boater safety and wear of Coast guard approved Personal flotation devices as required by state, federal and or local laws.

Site Access The contractor shall renew the previously obtained and expired Special Use Permit (SUP) from the U.S. Fish and Wildlife (Sabine Refuge) prior to mobilization. The excavator shall be unloaded at the north Hog Island Gully parking lot. The contractor shall minimize and/or avoid where possible, tracking the excavator across natural marshes. Where possible, the excavator operator shall track through open water or on existing spoil banks. Where the excavator cannot track through open water or on spoil banks, it may track across created marshes. Where the buggy must track across marshes, it shall track in a path that will minimize tracking distance and impacts to marshes.

The excavator shall travel southeastward along Hog Island Gully Canal, tracking ontop the old containment dike spoil banks till it reaches Area B creek#6. The operator shall begin work in Area B creek#6, then work clockwise finishing with Area B, creek#5. From there, the excavator shall tract through open water to Area A, creek#5 and work counterclockwise finishing with creek#1. Upon completion of creek 1, the excavator shall return to the North Hog Island Gully parking lot to demob.

Figure 5. Map illustrating excavator tracking path.

Notice to Proceed The contractor shall mobilize to the site and begin work within 90 days of receipt of the notice to proceed.

DELIVERABLES SCHEDULE

1. Contractor shall notify FWS project officer 7 days in advance of mobilization to begin work.

2. After the first half day of creek excavation, the contractor shall call FWS project site contact John Savell (cell # 337-274-4418) to discuss progress and nature of soil being excavated. If the contractor has any recommendations to FWS regarding opportunities to facilitate construction, the contractor shall at that time, discuss those with the FWS project contact (John Savell).

3. Contractor shall record a kmz waypoint at the beginning and end of every creek. These kmz files shall be provided to FWS upon project completion.

4. Contractor shall provide brief project completion report within 60 days of construction completion. That report shall include:

A) Mobilization /demobilization dates B) For each day worked, provide the beginning of excavation date/time and end of day excavation date/time C) Field notes regarding any difficulties encountered D) Recommendations to FWS regarding possible creek design modifications to facilitate construction ease Construction Schedule

Description of Submitted Bids for Part I and Part II Work Because FWS funding is fixed, and because costs may have increased since funding was determined, the proposed work may exceed available funding. Hence, bids should identify surveying and mob/demob costs separate from the creek construction costs. The creek construction costs should be scalable so that if construction costs exceed available funding, the length of creeks to be constructed can be reduced so that work costs fit within the available funding.

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