Polk-TOHO Interconnect Tank Farm Foundations

Davenport, Florida

Project Description/Services

Madrid Engineering Group, Inc. conducted subsurface investigation to assist in the design of the Polk / TOHO Water Interconnect facility in Davenport Florida.

The Polk / TOHO Interconnect Facility is intended to serve as a connection between the municipal water supply systems that serve central Polk County and the Lake Tohopekaliga areas. This interconnect consists of a series of 100-ft diameter above ground storage tanks, associated structures, and a storm water pond.

The purpose of MEG’s subsurface investigation was to provide foundation design recommendations for the structures and storage tanks to be constructed on site, and to provide soils information to assist the design engineers in their storm water pond design calculations.

The program consisted of: A series of hand augers and permeability tests to characterize the near surface soils for pond design. An Electrical Resistivity survey to determine the conductivity characteristics of the site for grounding purposes. Several deep SPT borings were completed in the proposed footprints of the above ground storage tanks to aid in the design of the foundations of the tanks.

During the deep SPT borings completed in the footprint of the southernmost tank foundation karst activity was identified at depth and additional testing was recommended to address possible sinkhole activity in this area. Upon receiving authorization, MEG completed a ground penetrating radar survey at the site to identify anomalous areas possibly associated with karst activity and investigated them further with additional SPT borings. A subsurface grouting program was designed to fill the subsurface voids encountered and densify the surrounding soils prior to construction.