- Apex provided project development, preliminary engineering and
design for City infrastructure.
- On project aspects that will ultimately become part of the
City's street and infrastructure systems, Apex was involved with
general oversight and collaboration with MnDOT.
The City of Detroit Lakes and the Minnesota Department of
Transportation (MnDOT) joined together in developing a
transportation improvement project along the western edge of
Detroit Lakes, Minnesota. Much of the project scope was developed
by MnDOT and as the Engineering Consultant for the City of Detroit
Lakes, Apex worked closely with their team to ensure that the
interests of the City were met.
While MnDOT developed much of the scope, some of the project
elements affected City infrastructure and will ultimately be
transferred from MnDOT to the City upon project completion.
Therefore, Apex provided oversight, development, and design input
with these aspects. Additionally, Apex was responsible for
developing improvements to the City of Detroit Lake's sanitary
sewer, watermain, lift stations, and local streets impacted by the
project. High groundwater levels, poor soil conditions, a sewer
depth of 30 feet and proximity to TH 10 made conventional open-cut
excavation very difficult. Therefore, the lift station was
installed using a sinking caisson method which eliminated the need
for excavation near the busy highway and avoided the uncertainty of
excavating in poor soil conditions. The adjacent 1,300 feet of
watermain and lift station forcemain were installed utilizing
horizontal directional drilling.
The overall project scope includes the reconstruction and
extension of both the TH 59 and TH 10 frontage roads, an underpass
at TH 59, the extension of Holmes Street, stormwater collection and
treatment improvements throughout, surface improvements to TH 10,
and traffic signals among other ancillary work. In response to
these improvements, the City of Detroit Lakes will be making
improvements and relocations to additional infrastructure including
sanitary sewer, lift stations, and watermain. Portions of the
project were constructed the fall of 2014 with the remaining work
completed during the 2015 construction season.