19960336 Ver 1_Stormwater Notice of Duplicity_20180215

Triangle Town Center Stormwater Control Measures
Summary of Maintenance Tasks
February 2018
DSG Pond in Fall 2017 before maintenance. Note vegetative growth in riprap inlet in foreground, around perimeter, as
well as in channels entering from left and rear. Note that the forebay berm (near channel entering from left) is
inundated due to inlet drawdown pipes plugged with organic debris from beavers and others.
DSG Pond in February 2018 showing earthen forebay berm with weir; riprap channel footprint cleared of vegetation.
Water surface approximately one foot above permanent pool elevation after recent rains. No visible sedimentation in
forebay. Plan to reinforce forebay weir section with riprap to minimize the potential for erosion.

Triangle Town Center Stormwater Control Measures
Summary of Maintenance Tasks
February 2018
DSG Pond in February 2018 with inlet riprap berm clear of vegetation. Beaver leveler is barely visible while slightly
submerged and located on outside center of riprap berm.
This photo was taken in late December 2017 depicting the majority of completed maintenance tasks with Dick's Sporting
Goods shown in upper right.
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Triangle Town Center Stormwater Control Measures
Summary of Maintenance Tasks
February 2018
Photo taken of OWF Wetland in November 2017 standing near outlet looking southwest. The outlet control structure for
the OWF Pond is shown in upper right. Water level lowered to survey sediment deposition. Sediment removal scheduled
for spring 2018. Note the transmission tower on left.
Fir
OWF Wetland photo taken in December 2017 showing forebay in foreground that will require sediment removal.
Removal scheduled for spring 2018. Transmission tower is visible in upper right.
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