Supplemental Agenda Items - FGUA

CPH Engineers
Key Largo Wastewater Treatment District – Northern Forcemain Project
Project: $2.4 million
Owner: Key Largo Wastewater Treatment District
Owner Contact: Chuck Fishburn, (305) 451-5105
Included the design of the Northern Forcemain with all-PVC piping, except for the
directional drills that used HDPE, and the aerial bridge crossing that used ductile iron.
The pipeline size varied from 8 to 10 inches along the U.S. 1 corridor.
The project was to be bid originally in two phases, but after the contractor completed
most of Phase I, it was decided by Key Largo to modify the Phase I contract to include
Phase II. This determination was based on a good working relationship between the
entities, a fair price, and good quality of work on behalf of the contractor.
Phase I consisted of 1,385 linear feet of 4-inch, 5,465 linear feet of 8-inch, and
11,750 linear feet of 10-inch PVC forcemain. There were 1,062 linear feet of 4-inch
directional drill and 200 linear feet of 6-inch directional drill under U.S. 1. The first
phase also included an aerial bridge crossing for the Adam’s Cut of approximately 141
linear feet.
Phase II consisted of 11,333 linear feet of 8-inch PVC pipe as well as 1,341 linear feet
of 4-inch directional drill and 150 linear feet of 8-inch direction drill under U.S. 1.
CPH provided preliminary engineering to determine capacity and the proposed
connection points along the system. By the use of water meter data, land use maps
and aerials, CPH determined the demand of each residential, commercial and public
entity that would tie into the system. CPH determined the various basins that would
contribute to each potential lift station based on aerials, water system maps, county
property appraiser maps, and topographic mapping.
During that process, CPH determined that there would be two vacuum pump stations
and numerous smaller standard submersible pump stations. The flow data along with
the basin data was used to develop a SewerCad model to determine pump station
requirements and the associated line sizes based on a 24-hour simulation.
CPH provided the final design of the forcemain system along the U.S. 1 corridor,
including the design utilizing the bridge at Adam’s Cut for the pipeline support.
Team Proposal Florida Governmental Utility Authority
56