HomeMy WebLinkAboutAPA188pc.wo J88G;
DRAFT July 22,1982
JRP
'SUSITNA HYDROELECTRIC PROJECT
ACCESS STUDY
Development Qfa Plan to Complete Access to Watana Within One'Year of Licensing
The following report reviews the task of completing initial access to the
Watana site within twelve months of receipt of FERC license.•Three routes
have been considered.These are Denali (Plan #17),North (13)and South (16)..
In assessing the problems of constructing these alternative routes it has been
concluded that the South Route would be the most difficult.Therefore,the
report uses this r-oute as the basis for developing a construction plan.
The objective of initial access construction is to provide land access for the
start of delivery of heavy construction plant and materials within one year.
The tas k is rev;ewed under the fo 1.1 ow;ng head;ngs:
1 -Management
It is essential that the Project Management and Powei'Author;ty are commi tted
-.to achieving the goal set forth,and that all necessary resources 'are made avail-
able well in advance of need.In addition,numerous restraints that could
impede progress must be removed.The Project Team must have the authority to
act quickly and in direct response to field situations as they develop,and
not be required to obtain Management approval for the day to day running of the
construction work..Direct on-site management by a resident engineering staff
of experienced earthwork,geotechnical,civil,surveying,hydraulic and
expediting personnel can alleviate the nonnal consttuction delays caused by
surveys and change order approval procedures.
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in selection of construction methods.
A number of techniques can be used to speed up work:
a)Constt'uct .minimum width .and fi'll depth consistent with available materials
and foundation conditions.
b)Place gravel fill in winter on frozen ground.
c)Develop borra'"areas ahead of road construction..If work is to be done in
freezing weather,open a limited face and keep work going 24 hours per day ..
Backup eguipment,especially loaders.and dozers,will be required.
d)Install culverts by excavating through fill,or use partially prefabricated
Super Arch and panel box culverts which can be rapidly placed and covered.
e)Use short construction time single span military IiBailey"or panel type
bridges over narrow.stream channe'ls,which have spans up to 210 feet,and
90 ton capacities up to 110 foot spansm These can be replaced later with
permanent bridges.
f)Place fill oVer filter or geotextile fabric,using load distribution or
stress bulb spreading method.
g)Avoid cut a~d fill operations.Generally initial road should be constructed
with gravel fill.
h)Provide adequate right-o~way width~and locally,several alternative
routes,to give flexibility in alignment in areas of poor foundation
condit'ions (bogs;permafrost,sidehill spring areas,slope stability
problem areas).
i)t1i nimi ze stri ppi ng,both to (..ave time and to avo;d many of the permafrost
problems -clear and fill directly.
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