C44 Reservoir/STA Project Contract No. 1, Intake Canal/Project Access Road and C-133A & C133 Canals, Martin County, Florida

C44 Reservoir/STA Project Contract No. 1, Intake Canal/Project Access Road and C-133A & C133 Canals, Martin County, Florida, is part of the Indian River Lagoon South (IRLS) restoration. This project is the first phase of three anticipated C-44 Reservoir/Stormwater Treatment Area Projects. The work for C-44 Contract No. 1 consists of the following elements:

(1) Intake Canal - approximately 20,000 linear feet in length with a 60 ft bottom width for a majority of its extent (30 ft bottom width from Citrus Boulevard to the C-44 Canal) at an elevation of 3 ft NAVD88. Design conveyance capacity for the intake canal is approximately 1,300 cubic feet per second (cfs). The intake canal follows the alignment of the existing Troup Indiantown Water Control District (TIWCD) irrigation canal. Canal side slopes under the Citrus Boulevard Bridge will be comprised of a vertical sheet pile wall system.
(2) Project Access Road - 24 ft wide paved road approximately 18,000 linear feet long and constructed along the east side of the intake canal. Swales, ditches, dry detention areas, and associated culverts/structures are included for water quality treatment and conveyance. Material referred to as "covered impacted soil" is shown on the Drawings in the area of the Project Access Road. Excavation or disturbance of this material is limited to a depth of 6 inches.
(3) C-133A Canal and C-133 Canal south of Bar-B Ranch property - to maintain drainage service for the Bar-B Ranch property and properties to the north. The C-133 canal improvements will extend to the C-133 Canal Spillway and will include relocation of the access road for Bar-B Ranch. Two 84-inch diameter corrugated metal pipe (cmp) culverts in the existing C-133 canal will be removed by others during Contract 1construction before completion of the C-133 canal grading as shown on the Drawings. A maintenance road will be constructed on the east side of the C-133 canal.
(4) C-133 Canal Spillway - spillway located within the C-133 Canal south of the Citrus Boulevard box culvert at the C-44 Canal. The spillway structure consists of two sharp-crested weirs. The crest of the upstream weir is at elevation 17 ft NAVD88 and the crest of the downstream weir at the C-44 Canal is elevation 12 ft. The spillway is designed for a normal operational flow of approximately 500 cfs. These spillways are the discharge point for the off-site areas located north of the Project.
(5) C-133/CR726 Culvert - comprised of two (2) ten ft by six ft (10'x 6') box culverts constructed under Citrus Boulevard within the east drainage canal. Construction of temporary roadways and drainage facilities on the north side of Citrus Boulevard will occur to maintain vehicular use during construction of the box culvert. Upon completion, the box culvert will be owned and maintained by Martin County.
(6) Intake Canal/CR726 Bridge and Roadway Improvements - include a new bridge spanning the intake canal (40 ft wide and 80 ft in length), roadway bridge approaches, turn lanes for the project access road, treatment areas, stabilized shoulders, paving, and striping upgrades. Upon completion, bridge and roadway improvements will be owned and maintained by Martin County. Construction of temporary roadways and drainage facilities on the north side of Citrus Boulevard will occur to maintain vehicular use during construction of the bridge.