Cherry Street Manhole Repair – Unacceptable pavement distress had developed on a heavily traveled street in Plant City.  Soil borings revealed poor compaction adjacent to the manholes at 3 feet below the surface.  MEG devised an innovative, low cost approach for the City of Plant City Engineering Department involving injecting low strength grout, which added strength to the soils and filled the voids.  Conventional approaches would have required digging up the loose soil and re-compacting, which would have taken much more time and disrupted traffic MEG developed and submitted compaction grouting specifications for the remediation of the subsurface soils adjacent to manhole structures located on Cherry Street. We also provided construction monitoring and quality control over the compaction grouting operation for each of eight manhole structures, including materials testing of the slurry grout mix. Field personnel submitted daily summary reports for the remediation operation.

Sewer Relocation Program Priority Area 1 – In 2009 we provided a preliminary geotechnical report to support the initial conceptual design of the Sewer Relocation Program.  We reviewed existing information related to the project area, including aerial photographs, USGS quadrangle maps, SCS soil survey reports, geologic maps and publications, and available geotechnical reports for the site.  Also, a site reconnaissance was performed to aid in the assessment of the general surface and subsurface conditions, as well as evaluate access to proposed boring locations, coordinate utility clearance, etc.

Our proposed analyses and design recommendations included:

  • An engineering description and characterization of the subsoil stratigraphy and groundwater conditions at the time of the field exploration.
  • General recommendations regarding site suitability for the proposed project.
  • General site preparation and earthwork recommendations including suitability of onsite soils for reuse as trench backfill.
  • General recommendations regarding unreinforced trench side slopes.
  • General recommendations regarding drainage concerns.
  • A set of boring profiles showing soil types and water table conditions.
  • A boring location plan showing the locations of all of our borings. (base map to be provided by Jones Edmunds)

Plant City Water Tower No. 6 – In 2010 we provided a geotechnical report to evaluate subsurface conditions surrounding the existing tower to verify that adjacent subsidence is not compromising the tower’s foundation.

Limited Emergency Subsidence Investigation along Alexander Street – In 2010 we investigated a subsidence investigation along Alexander Street, which included utilizing GPR survey and SPT borings, which was determined to be related to a reported drop of 50 feet or more in the aquifer potentiometric head due to continuous pumping of agriculture wells.  We prepared and monitored a low-mobility grouting program to adequately treat the very soft soils above the limestone unit.

Deviation of Project Specifications for Airport Road Culvert Replacement – In 2011 As requested by the City of Plant City, Madrid Engineering Group, Inc. (MEG) has completed a review of the proposed deviation to the project specifications for the above referenced project.  The primary purpose of this review was to determine if the proposed deviation from the project specifications was consistent with Florida Department of Transportation (FDOT) Standard Specifications.  We understand that the proposed deviation is to use #57 coarse aggregate in lieu of granular fill soils at the bedding zone, since normal pumping methods are insufficient to dewater the excavation.    MEG’s opinion that the proposed deviations are compliant with the FDOT Standard Specifications Section 125.8.3.4 “Backfill Under Wet Conditions”, provided the following conditions are met; 1.) The aggregate is fully wrapped in Type D-4 Filter Fabric as specified on Design Standard Index No. 199. 2.) The aggregate is not placed within four (4) feet of the end walls. Use normally accepted backfill material for the last four (4) feet at each end of the box culvert where it ties in to the end wall. 3.) The aggregate is used for the entire depth of the bedding material, twelve (12) inches, as shown on page 5 of 6 Plan and Profile of the Construction Plans.  MEG’s opinion was that the use of a mud mat was not compliant with FDOT Standard Specifications.

 

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