20150189 Ver 1_More Info Received_20150325

Price, Zan (George)
From: Grant Ginn <gginn @wolfcreekeng.com>
Sent: Wednesday, March 25, 2015 2:51 PM
To: Price, Zan (George)
Cc: Leslie, Andrea J; 'Goetz, Anita'; sarahf @carolinamountain.org
Subject: RE: Additional Information Request - Hyder Pasture Bog Restoration DWR 15 -0189
Za n,
The proposed sediment trap and rain garden have been included in the project design at the request of USFWS to
provide pretreatment of surface water runoff from Roper Road. This runoff has the potential to carry sediment and road
surface pollutants into the wetland restoration area and it was determined necessary to provide an additional buffer
and filtration in order to safeguard the sensitive bunched arrowhead habitat.
The linear wetland feature in question is primarily associated with a previously excavated ditch that drains from Roper
Road. This feature is essentially a narrow ditch bottom that extends upslope and is most likely a product of shallow
groundwater that follows the topographic profile. The excavation of the sediment trap and rain garden may have some
localized impact on ground water, but it is unlikely that this effect will extend more than 10 to 20 feet upslope given the
nature of the soil profile. This is readily demonstrated by the fact that the existing ditch is constructed on a 6% grade
which has the capacity to drain this wetland feature. However, the composition of the soil and the nature to the ground
water have maintained this as a wetland feature.
Additionally, this wetland feature is impacted further downstream with cut and fill activities directly associated with the
construction of the proposed wetland restoration. Given the importance of establishing and protecting the bunched
arrowhead habitat, our judgment has been that limited impacts to the existing linear /ditch wetland feature our
outweighed by the benefits to gained by the wetland restoration.
If you require an additional information, please advise.
Grant Ginn, PE
Wolf Creek Engineering, pllc
From: Price, Zan (George) [mai Ito: Zan. PriceCcbncdenr.gov]
Sent: Wednesday, March 18, 2015 4:59 PM
To: gginnC&wolfcreekenQ.com
Cc: Leslie, Andrea J; Goetz, Anita; sarahf(a)carolinamountain.org
Subject: Additional Information Request - Hyder Pasture Bog Restoration DWR 15 -0189
Grant,
The Division of Water Resources (DWR) has performed a review of the 401 Water Quality Certification application
submitted for the referenced project. Please provide additional information so we can complete our review.
The proposed plan shows a rain garden feature by the existing linear wetland along the western portion of the
property. DWR understands from conversations with the US Fish and Wildlife Service that the proposed rain garden is
intended to treat offsite stormwater runoff and protect the bog restoration area. Per the North Carolina Stormwater
BMP manual, rain garden facilities shall not be used where the seasonally high water table or confining layer is less than
2 feet below the bottom of the BMP. It appears the proposed raingarden is located in an area with shallow ground

water due to the proximity to existing wetlands. DWR is concerned that the proposed raingarden underdrains could
affect the hydrology of the adjacent linear wetlands.
Please provide justification for the use of a rain garden with underdrains in the proposed location or provide details for
an alternative BMP.
Contact me if you have any questions or concerns.
Zan Price, P.E.
NCDENR - Division of Water Resources
Water Quality Regional Operations Section
Asheville Regional Office
2090 U.S. Hwy. 70
Swannanoa, N.C. 28778
ph.: 828 - 296 -4500
fax: 828 - 299 -7043
email: zan.price @ncdenr.gov
website: www.ncwaterguality.org
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