Case Studies

Land Water Case Studies

The Descriptions & Services provided for three projects manged by Madrid Engineering Group, Inc. showcase the varied expertise of MEG staff…

Our Environmental Overview

land-water quality investigations

For several years, MEG supported the environmental industry by installing monitor wells and completing water quality sampling in accordance with FDEP regulations, and was a valued subconsultant for the districtwide District One environmental consulting contract. MEG showed its innovative side by completing ground-breaking research and application of chemical stabilization of waste phosphatic clays that are useful in reclaiming very soft clays for multiple uses. We also worked with others to patent the Phos-Filter™, a revolutionary method to reduce phosphorus in surface waters and stormwater runoff. By the year 2000, MEG began completing design-build projects, and in 2002, MEG had begun its work in subsidence investigations.

Case Studies

McGrath RentCorp Porous Pavement Analysis

Mulberry, Florida

When McGrath RentCorp wanted to evaluate porous pavement options with the Southwest Florida Water Management District to reduce the stormwater runoff and protect the adjacent wetlands, their general consultant, Ridge Professional Group (Lakeland), turned to MEG. The goals were to reduce runoff and store water in place within the voids of the pavement for infiltration. Madrid Engineering Group, Inc. completed several analyses to assist the owner in completing a porous pavement surface or other similar alternative to reduce the anticipated runoff to the retention pond on this 121-acre development.

Several alternatives were considered, including GeoWeb® cellular confinement, and the use of clean imported limerock underlain by geotextile and not underlain by geotextile. These and other options resulted in stormwater routing analyses showing significant reduction of runoff, using the natural infiltration of the underlying soils to absorb the brunt of Florida’s renowned tropical summer storms. The detailed analyses were presented to the District for approval. Ultimately, because RentCorp was highly committed to the environment, they used Madrid Engineering’s least-cost porous pavement solution instead of asphalt, despite not being given proper credit for the design.

Polk-TOHO Interconnect Tank Farm Foundations

Davenport, Florida

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.

When the deep SPT borings were 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 to stabilize the foundation prior to tank construction.

Mulberry Wastewater Treatment Plant

Mulberry, Florida

Madrid Engineering Group, Inc. served as the geotechnical sub-consultant to the general civil engineer (PBS&J, now Atkins) for an analysis of a leaking former settling pond that is no longer in use at the Mulberry waste water treatment plant.

One of the ponds formerly used for settling of processed waste water prior to the construction of the new waste water treatment plant to the southwest was found to be seeping water through its southern dike close to a nearby wetland. Wastewater contamination of the wetland (high levels of nitrogen and phosphorus) was a reason for concern so MEG was tasked with evaluating the dikes around the pond.

A series of SPT borings and permeability tests were completed through the dike and in the surrounding areas to construct a soils profile of the pond walls and bottom. A flow net analysis and water balance was performed to estimate the amount of water leaking through and under the dike toward the wetland area.

MEG made recommendations for stabilizing the dike wall and cutting off water flow through and under the dike wall in order to minimize the potential for contamination of the nearby wetland areas.

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