20070116 Ver 1_More Info Received_20070301

E'nV
~vironmental Consulting Services Inc.
February 23, 2007
Amanda D. Jones
Regulatory Specialist
U.S. Army Corps of Engineers
Asheville Regulatory Field Office
151 Patton Avenue, Room 208
Asheville, NC 28801-5006
RE: Silver Creek s/d, Ashe County; changes to site plan
3764 Rominger Road
Banner Elk, NC 28604
Ph/Fax: [phone]
-r-~ @env-ecs.com
~~~ ~ ~ ~~~
~'ey'Gfld l7 `''.CC'
Based on recommendations made, the following changes have been made to the Silver Creek
proposed subdivision site plan in Ashe County, NC.
1. Stream Impact One and Two were eliminated by re-aligning the road and utilizing an existing
farm road grade. This new road alignment is shown on Map One. This new road alignment will
remove and upgrade an existing 18" by 16' concrete pipe, installing a 36" by 30' CMP, with a
net impact of 14' at this crossing (now Stream Impact One). Wetland Impact Two was
eliminated with the new road alignment.
2. Wetland Impact One was reduced from 7,270 sf to 3,456 sf by adjusting the road and bridge
alignment shown on Map Two. Lot 109 was eliminated. No changes to lots 83 and 84;
however, grading and residential construction on these two lots will not impact wetland BC-
5W.
3. The bridge crossing on UT-3 is no longer being proposed; instead a proposed 48" by 40' CMP
will be used as part of the road crossing (now Stream Impact Two) shown on Map Three.
Included is a revised section of the original PCN submitted for the Silver Creek project with the
changes being reflected in the impact table and quantified impacts. The new total permanent
stream impacts have been reduced from 147 linear feet to 114 linear feet and the new total
permanent wetland impacts have been reduced from 0.17-acres to 0.08-acres.
Thank you,
~~~~
Jo C. Vitas
President, E'nV Environmental Consulting Services Inc.
C.C: Daryl Lamb, Steve Silver, McGill Engineers

~~-otter
VI. Proposed Impacts to Waters of the United States/Waters of the State
It is the applicant's (or agent's) responsibility to determine, delineate and map all
impacts to wetlands, open water, and stream channels associated with the project.
Each impact must be listed separately in the tables below (e.g., culvert installation
should be listed separately from riprap dissipater pads). Be sure to indicate if an
impact is temporary. All proposed impacts, permanent and temporary, must be
listed, and must be labeled and clearly identifiable on an accompanying site plan.
All wetlands and waters, and all streams (intermittent and perennial) should be
shown on a delineation map, whether or not impacts are proposed to these
systems. Wetland and stream evaluation and delineation forms should be
included as appropriate. Photographs may be included at the applicant's
discretion. If this proposed impact is strictly for wetland or stream mitigation, list
and describe the impact in Section VIII below. If additional space is needed for
listing or description, please attach a separate sheet.
Provide a written description of the proposed impacts: Four permanent
impacts to streams have been recognized as part of the proposed development
of the road network for the Silver Creek residential subdivision. Each of these
impacts involves the installation of a culvert. Stream Impact one involves
removing an existin lg 8" by 16' concrete pipe up rading and installing a 36"
by 30' CMP along a section of Road "F" on UT-1. Stream Impact two is a
proposed 48" by 40' CMP that will substitute one of the proposed bridge
placements along a section of Road "O" on UT-3. Stream Impacts three and
four are along two adjoining sections of Road "K" and involve piping a total
of 60'. UT-3C and UT-3B will each be culverted with a 36" by 30' CMP.
Each culvert installation site will involve temporary impacts in addition to
permanent impacts. Temporary impacts will consist of 5' wide sandbag dams
allowing for water to be pumped around the pipe installation area, see detail.
Following completion of each road segment involving a culvert installation,
the temporary measures will be removed and the impacts will be fully
mitigated restoring the site to its original condition. A section of wetland unit
BC-5 W will be impacted byproposed road construction. Approximately 3,456
sf will be impacted by rg ailing and filling activities, this area is identified as
Wetland Impact one. Two existing stream fords will be improved for
temporary crossing_purposes as part of site development. These two sites are
identified as Stream Impact sites five and six. Timber mats will be laid down
minimizing impacts to the stream channel and aquatic habitat at the two
temporary stream crossings. The four temporary sandbag dam diversions and
two temporary stream crossings are being submitted under the NWP 33 pre-
construction permit notification application. The four permanent stream
impacts and one permanent wetland impact are being submitted under the
NWP 39pre-construction permit notification application.
Silver Creek PCN
Revised Changes-022307
Ashe County, NC
E'nV-ECS, Inc.

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2. Individually list wetland impacts. Types of impacts include, but are not
limited to mechanized clearing, grading, fill, excavation, flooding,
ditching/drainage, etc. For dams, separately list impacts due to both structure
and flooding.
Wetland Impact Type of Wetland Located within Distance to Area of
Site Number Type of Impact (e.g., forested, marsh, 100-year
Floodplain Nearest
Stream Impact
(acres)
(indicate on map) herbaceous, bog, etc.) ( es/no) (linear feet)
Wetland Impact 1 Clearing, grading, fill Forested, riparian No 35' 0.08

Total Wetland Impact (acres) 0.08
3. List the total acreage (estimated) of all existing wetlands on the property:
96,165 sf/ 2.207-ac
4. Individually list all intermittent and perennial stream impacts. Be sure to
identify temporary impacts. Stream impacts include, but are not limited to
placement of fill or culverts, dam construction, flooding, relocation,
stabilization activities (e.g., cement walls, rip-rap, crib walls, gabions, etc.),
excavation, ditching/straightening, etc. If stream relocation is proposed, plans
and profiles showing the linear footprint for both the original and relocated
streams must be included. To calculate acreage, multiply length X width, then
divide by 43,560.

Stream Impact
Number
(indicate on ma )
Stream Name
Type of Impact
Perennial or
Intermittent? Average
Stream Width
Before Impact Impact
Length
(linear feet) Area of
Impact
(acres)
Stream Impact 1 UT-1 Permanent-culvert Perennial 3' 14' 0.001
Stream Impact 2 UT-3 Permanent-culvert Perennial 4' 40' 0.004
Stream Impact 3 UT-3C Permanent-culvert Perennial 3' 30' 0.002
Stream Impact 4 UT-3B Permanent-culvert Perennial 3' 30' 0.002
Stream Impact 1 UT-1 Temporary Perennial 3' 3' 0.0002
Stream Impact 2 UT-3 Temporary Perennial 4' 3' 0.0003
Stream Impact 3 UT-3C Temporary Perennial 3' 3' 0.0002
Stream Impact 4 UT-3B Temporary Perennial 3' 3' 0.0002
Stream Impact 5 Bear Creek Temporary Perennial 14' 10' 0.003
Stream Impact 6 Bear Creek Temporary Perennial 14' 10' 0.003
Total Stream Impact (by length and acreage) 114'/146' 0.016
5. Individually list all open water impacts (including lakes, ponds, estuaries,
sounds, Atlantic Ocean and any other water of the U.S.). Open water impacts
include, but are not limited to fill, excavation, dredging, flooding, drainage,
bulkheads, etc.
Silver Creek PCN
Revised Changes-022307
Ashe County, NC
E'nV-ECS, Inc.

r
Off- Oll L
Open Water Impact

Site Number
(indicate on ma)
Name of Waterbody
(if applicable)

Type of Impact Type of Waterbody

(lake, pond, estuary, sound, bay,
ocean, etc.) Area of

Impact
(acres)

Total Open Water Impact (acres)
6. List the cumulative impact to all Waters of the U.S. resulting from the proiect:
Stream Impact (acres): 0.016
Wetland Impact (acres): 0.08
Open Water Impact (acres): 0
Total Impact to Waters of the U.S. (acres) 0.096
Total Stream Impact (linear feet): 114'/146'
7. Isolated Waters
Do any isolated waters exist on the property? ^ Yes ®No
Describe all impacts to isolated waters, and include the type of water (wetland
or stream) and the size of the proposed impact (acres or linear feet). Please
note that this section only applies to waters that have specifically been
determined to be isolated by the USACE.
8. Pond Creation
If construction of a pond is proposed, associated wetland and stream impacts
should be included above in the wetland and stream impact sections. Also,
the proposed pond should be described here and illustrated on any maps
included with this application.
Pond to be created in (check all that apply): ^ uplands ^ stream ^ wetlands
Describe the method of construction (e.g., dam/embankment, excavation,
installation of draw-down valve or spillway, etc.):
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic,
trout pond, local stormwater requirement, etc.):
Current land use in the vicinity of the pond:
Size of watershed draining to pond: Expected pond surface
area:
Silver Creek PCN
Revised Changes-022307
Ashe County, NC
E'nV-ECS, Inc.

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