S-161 Modification, Upper St Johns River Basin, Jane Green Detention Area
<< Back to Project Samples
J2 was
contracted to perform construction services to provide adequate
draw down for Jane Green Creek through L-73 in order to decrease
hydraulic period upstream in the Bull Creek Wildlife Management
Area. S-161 modifications should nearly restore Jane Green
Creek to its historical flow alignment and provide improved draw
down through L-73 with an invert of 19.0 feet.
Work included
extensive dewatering and drainage control, reconfiguring a weir by
removing concrete from ogee weir structure to form two box
culverts, adding mechanical slide gates and structural steel access
platforms, forming and pouring a new apron slab at the base of the
weir, removing existing vertical lift gates and associated
machinery, and installing floating debris barriers. Temporary
dewatering berms or structural closure will be needed of facilitate
required.
The work covered under this contract included the disassembly,
removal, and disposal of gate hoist equipment that was coated by
paint having a lead-base primer. This equipment was disassembled
and removed in a manner which did not expose any employee to lead
at or above the action level of 29 CFR 1926.62. The removed
equipment was disposed of in accordance with applicable federal,
state and local regulations. The newly constructed culverts
were painted with an Epoxy coating that required unique safety
measures in the semi-confined space the work was performed
within. This paint was applied in a manner which did not
expose any employee to OSHA controlled substances at or above the
action level of 29 CFR 1926.
The project's
contract duration fell largely during the rainy season, and the
specific location of the work to be performed presented unique
challenges that had to be overcome through careful consideration
and diligent efforts. The work involved in the Jane Green
Det. Project was situated below the natural water table and at the
bottleneck of an ecologic drainage system. As the rains
continually fell during the project, rapidly rising water levels on
both upstream and downstream sides of the dewatered work zone
threatened the success of the project. Also, continual rain
washouts destroyed construction progress and degraded haul
routes. Project management assessed and solved these issues
by dedicating a portion of the work day each and every day to
perform maintenance on dewatering structures as well as haul
routes. On-site management performed daily evaluations of
site conditions and the resultant schedule delays. These
daily evaluations were taken into consideration and on-site
management made on the fly changes in work schedule and priorities,
as well as scheduled material deliveries to the site to keep the
project running on schedule. These daily considerations and
regulations made it possible for this project to be completed
successfully and on-time.
Back to Top