20141129 Ver 2_More Info Received_20160810

B <. TLAS
VIRONI MENTAL
July 21, 2016
To: Zan Price
From: Jennifer Robertson
Atlas Environmental Inc. staff conducted three pedestrian surveys at Creekside
Village on Friday July 15, 2016, Monday July 19, 2016, and August 9, 2016.
Creekside Village received a substantial rainfall event on Monday July 11, 2016.
Rainfall gauges on site and near the site recorded three inches of rainfall in less than
an hour. Other locations around the Asheville area had rainfall totaling four to five
inches in the previous 14 days which does not include other known rain events a few
days later. Due to the storm intensity and localized nature of the event runoff
exceeded the design criteria and capacity of the storm water management devices.
During Atlas's first inspection on July 15th the unnamed tributary to Reams Creek
on property had receded back into its banks leaving debris lines at the extent of the
flooding. Stream discharge was still elevated above base flow conditions and
exhibited turbid water resulting in a mixing zone at Reams Creek. The second site
inspection on July 19th showed near base flow discharge and clearer water and no
obvious mixing zone at the confluence with Reams Creek.
Despite the turbid water there was very little sediment deposition along the
unnamed tributary to the confluence with Reams Creek. As discharge fell and water
velocities slowed there was a very thin settling of clay on the bed substrate. This very
thin layer is not feasible to remove by means of equipment or shovels. Following the
site inspections Atlas staff walked the unnamed tributary with David Earley and Andy
Southard to discuss locations along the unnamed tributary that needed debris
removed from the stream.
A third row of silt fence has been added in some locations within the past month.
Construction of the dam is complete. Seeding and matting has been installed around
the pond. Looking upstream grading on the right side of the dam is complete.
Grading on the left side of the dam will be completed once the permanent stormwater
detention is installed underground. A retaining wall will be installed around the pond
but this does not get constructed until phase 5. No additional work below the ordinary
high water mark of the pond should be necessary.
Additional coir logs will be temporarily installed in the stream upstream of the tree
line until construction is complete. Any accumulated sediment behind these logs will
be cleaned. A coir log will also be installed around the pond outlet as added
protection.

July 15th 2016 Photographs
Mixing zone at Reams Creek
P
00 -
Silt Fences Intact
Turbid Water
Overland Flow Sediment Deposition

July 191h 2016 Photographs
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Less Turbid Water
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'All'
Flood Debris Wrack
Gravel in Creek Woody Debris Needing Removal

Stream channel in wooded area
Ground cover establishment
Fiber log below dam capturing sediment
r.,
wi
M
Lr
Additional silt fences
Stream channel immediately below dam