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Additional Hydroelectric Projects
Chase Mill Hydroelectric Project
Burlington, Vermont
Project Description
In 1978, the Electric Department of the City of Burlington began a study to determine
if a peaking electric power plant could be constructed on the site. Lachel &
Associates, Inc. was responsible for the geotechnical investigation of the
400-ft-long dam, the 20-ft-diameter power tunnel, and site evaluations of various
powerhouse locations.
Scope of Services
Lachel conducted geologic mapping, slope stability analysis, exploration borings,
air photo interpretation, a regional earthquake evaluation, ground movement
instrumentation, ground support and geophysical field studies. Numerous project
configurations were evaluated and LA was an integral part of the feasibility
evaluation and development of the project.
Client
Burlington Electric Department
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Manabao-Bejucal-Tavera
Hydroelectric Project
Dominican Republic
Project Description
In February, 1986, Dennis Lachel was retained by the largest construction contractor
in Central America to provide geotechnical and tunnel engineering services for
bidding this large project. Critical questions regarding the influence of the
geology on the construction of the 7225 meter tunnel were addressed including
location and volume of groundwater, tunnel "stand-up-time," ground support
requirements, the potential for earthquakes and their effect on the construction
operation and the potential success and/or failure for the use of a tunnel boring
machine (TBM) on the project.
Scope of Services
Accomplishing the various tasks involved review of the existing geotechnical
explorations, examination and interpretation of aerial photographs, a detailed
evaluation of rock core and samples recovered from borings taken along the route,
discussions with engineers and geologists in the Dominican Republic familiar with
the project, and a field exploration program which examined the full length of the
tunnel line and the surrounding geology. The final product was a detailed report,
in Spanish, which summarized the constructibility conditions along the route,
predicted the advance rate for the tunneling, recommended applicable construction
equipment, estimated tunnel support requirements, and recommended additional
geotechnical explorations required to answer questions critical to the safe and
successful completion of the project
Client
ICA, S.A., and Obras y Tuneles, S.A., Mexico
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