Client
Lake County Water Authority
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Location
Leesburg, Florida
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Key BCI Staff
Walter Reigner, PE, CPESC
John Kiefer, PE, PWS
Mark Schwartz, PE, CFM
Terry Dykehouse, PE
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Project Costs
Engineering: $350,000
Construction: $7.2 Million
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Start Date
June 2007
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Completion Date
Design: July 2004
Construction: 2007

Scope

Lake Griffin is a 9,300 acre lake at the headwaters of the Ocklawaha River in Lake County, Florida. BCI provided evaluation, design, and construction support services of a project to remove sediments from more than 30 canals ringing the lake and to place those sediments in a confined section of a subsided muck farm.

This project required BCI’s expertise in water resource engineering (disposal site impoundment water budget), hydraulic system design (floating pipeline with booster pumps), water quality treatment (alum and polymer feeds for turbidity control), geotechnical engineering (slope stability,  embankment design, settling and consolidation of mixed media slurry), construction support services (bid specifications and plans, contractor screening and selection, engineering inspections, progress payment review, permit compliance review, landowner  coordination). 

Unique components of the project include long transport distances (five to twelve miles) from the  canals to the disposal site; the highly variable composition of the dredged sediments (unconsolidated sands, flocculent muck, consolidated muck, and cohesive clay); and a requirement for “surgical” sediment deposition at a subsided muck farm to cap pesticide   contamination hotspots while simultaneously maintaining several feet of water over the disposal site. The project is well underway and is expected to be completed on budget during 2007.