20081100 Ver 1_More Info Received_20090108

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LETTER OF TRANSMITTAL
Ward Consulting Engineers, P.C.
8386 Six Forks Road, Suite 101
Raleigh North, Carolina 27615-5088
-? [phone] Fax: [phone]
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JAN S 2009
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WE70,NDS AND ST CRt,4V;;.ATFR B " "
To: /fA.girl / d• Sd/ Date: - 7
Company:
We are sending you:
the following:
-Shop drawings
-Specifications
-Other
Attached -Under separate cover via
Prints -Plans -Samples
Copy of letter -Change order
Copies Date No. Description
2
M .17 17 Z11 I ;V
These are Transmitted as checked below:
OFF r approval Approved as submitted -Resubmit copies for approval
or your use _Approved as noted -Submit -copies for distribution
_As requested -Returned for corrections -Return -corrected prints
For review & comment Other
Remarks:
Copy To: Signed: XC4
Ward Consulting Engineers, P.C.
Engineering Solutions for Civil Design,
Stormwater Management, and Stream/Wetland Restoration
Mr. Andrew Williams January 5, 2009
Regulatory Project Manager
US Army Corps of Engineers
Wilmington District, Raleigh Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, North Carolina 27587
Reference: Response to request for additional information email dated November 5, 2008
Dear Mr. Williams:
I was waiting to respond to,your request for additional information until we had received
additional comments from DWQ. I received an email from Sue Homewood on December 22nd in
which she did not have any additional comments other than yours so we will be sending her a
copy of this letter and data. The following responses have been prepared addressing the data
requested by your office in the above referenced email.
1. Revised Impact Totals: The tables on pages 9 and 10 of the PCN have been updated to
reflect the revised impacts and enclosed. Drawing exhibits Figure 3A and Figure 3 have
been revised to show the revised impacts and labeled to show the impact amounts
corresponding to the new tables. The temporary impacts were not listed correctly in item
5 of my letter on September 30, 2008. These impacts are 375 square feet of wetlands
upstream of HW 20 for construction of the proposed retaining wall and 15 of temporary
stream impacts downstream of the relocated channel below HW 21 for the construction
of the boardwalk.
2. Monitoring Plan: A monitoring Level 1 plan document has been attached.
3. Success Criteria: The success criterion has been specified in the monitoring plan
attached.
Please let me know at your earliest convenience if you require additional information or if I may
be of further assistance during your review.
Sincerely, PtR- , '= ' ?Ward Consulting Engineers, P.C. DA
JAN 8 209
?rrr7 aY0P AiV?'a7E F 3Rt't;4
Becky L. Ward, P.E.
Cc. Ms. Sue Homewood, NCDNR Winston-Salem Regional Office
585 Waughtown Street, Winston-Salem NC 27107
8386 Six Forks Road Suite ioi, Raleigh NC 27615-5088 Phone: [phone]
Fax: [phone]
flg-I1oo
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,
senaratelv list imnactc clip to tenth etnlt-fiira an/l 0-14;-
Wetland impact Type of Wetland Located within Distance to Area of
Site Number T e of Im act
yp p
(e.g., forested, marsh, 100-year Nearest Impact

(indicate on map)
herbaceous, bog, etc.) Flood lain
p
Stream
(acres)
es/no linear feet
A Fill Forested Yes (partially) 0* 0.001
B Flooding Forested Yes (partially) 0** 0.049
C Temp Construction Forested Yes (partially) 0* 0.0085
Total Wetland Impact (acres) 0.0585
7k 11 T-1L- A A C_ -A
r rr+ .
11 V4laulu ?1VLrLLJ V 1 w uvUUI DUIIdlu lr1GCK
** Wetland B is fed by UT to South Buffalo Creek
3. List the total acreage (estimated) of all existing wetlands on the property: 0.146 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 he lnchidnd Tn nali limp aclra?rrn m„ 1*;-h' 1--4u "-' --A4L at__ -1 __ -I_ I

Stream Impact ---- ------ -, ---? --+ +vaa 1.aa ??a\Lµl, µ1V11 LL l Y1LLV V `t.7, JVV.

Number
Stream Name
Type of Impact
Perennial or Average
Stream Width Impact
Length Area of
Impact
indicate on ma Intermittent? 13
Before Im act linear feet acres
1 t
South
reek
Buffalo
C Flooding Intermittent 5 36 0.0041
2 UT to South
Buffalo Creek Piped Intermittent 5 36 0.0041
3 t South

Buffalo Creek Filled Intermittent 5
180
0.0207

4 UT to South Relocated Stream
Buffalo Creek to feed existing Intermittent 5 -58 -0.0067
wetlands
5 UT to South Relocated Stream

Buffalo Creek
below culvert Intermittent 5 -81 -0.0093

6 UT to South Relocated Stream
Buffalo Creek to feed Existing Intermittent 5 -27 -0.0031
wetlands

7 UT to South Existing Stream
Buffalo Creek filled Intermittent 5 25 0.0029

8 UT to South

Buffalo Creek Temp construction Intermittent 5
15
0.0017

Total Stream Impact (by length and acreage) 126 0.0144
Page 9of14 (12eV.1a-31-©g)
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.
Open Water Impact
Site Number Name of Waterbody Type of Waterbody Area of

indicate on ma (if applicable) Type of Impact (lake, pond, estuary, sound, bay, Impact
ocean, etc. acres
NA NA NA NA NA
Total Open Water Impact (acres) NA
6. List the cumulative impact to all Waters of the i J- R resulting from the nmi,-nt-
Stream Impact acres : 0.0144
Wetland Impact (acres : 0.0585
Open Water Impact acres : NA
Total Impact to Waters of the U.S. (acres) 0.0727
Total Stream Impact linear feet : 125
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.): installation of a riser/barrel system in an existing
depression
Proposed use or purpose of pond (e.g., livestock watering, irrigation, aesthetic, trout pond,
local stormwater requirement, etc.): aesthetic
Current land use in the vicinity of the pond: vacant (roadway directly to the south)
Size of watershed draining to pond: 11.99 Ac Expected pond surface area: 0.132 Ac
Page 10 of 14 ? r- ev l a - 31-08)
Greensboro Gateway Gardens
Monitoring Plan for Stream Restoration
1.0 Performance Criteria
To demonstrate mitigative success, baseline conditions will be established in the form of
as-built drawings. The as-built drawings will include profile and plan views of the
completed stream project. At the conclusion of the construction activities, the channel
modifications and planted vegetation based on a bankfull return period will be monitored
annually for a minimum of five years. Monitoring reports will be prepared at the end
each year and made available to the resource agencies.
1.1 Streams
The proposed success criteria for stream mitigation will be based on the stability of the
stream. The geomorphology of the stream will be monitored as follows:
• Dimension: Permanent cross sections (surveyed or located by GPS) will be
established in the frequency of one for every 20 bankfull widths along the length
of the reach. The proposed channel is approximately 4 feet wide and 166 feet in
length. Three cross sections will be set; two at riffle locations and one in a pool.
Measurements of W/D ratio, entrenchment ratio, and low bank height ratio will be
monitored yearly.
• Pattern: Pattern measurements will include sinuosity and meander width ratio and
will be performed yearly. Measurements of radius of curvature will be monitored
on newly constructed meanders for the first year only.
• Profile: Longitudinal profile will be surveyed and measurements collected on
slope (average, pool, and riffle) and pool-to-pool spacing.
• Materials: Pebble counts in pools and riffles will be measured. The D50 and D84
particle size diameter percentiles will be monitored to assure an increase in
coarseness in riffles and an increase in fineness in pools.
• Photo Reference Points: Photo reference points will be established at all cross
sections showing banks and channel. Additional photos will be taken at selected
structures on the project to monitor their structural stability.
• Vegetation: The stream bank and buffer planted area (approximately 2656 sq. ft. _
0.061 acres) will be monitored yearly. The woody vegetation will be evaluated
based on survival rates. The goal of the project will to maintain a 75% survival
rate of all planted trees and shrubs within the stream bank and buffer. If more than
75% of the woody vegetation does not survive each year all of the lost woody
vegetation will be replanted. The stream bank and buffer will be monitored each
year for herbaceous species. Any bare areas on within the stream bank and buffer
that are destabilizing the project due to lack of vegetation will be reseeded.
During the annual review the entire stream reach will be evaluated for any potential
problem areas and photographs taken to document the degree and severity. Potential
problem areas may include bank instability, in-stream structure failure or unsuccessful
Ward Consulting Engineers, P.C. 1 Greensboro Gateway Gardens
January 5, 2009
vegetation establishment. If a failure area is noted, corrective actions will be evaluated to
resolve the problem. Remedial actions will be undertaken considering any seasonal
limitations. Any remedial actions will be documented on the as-built plans.
1.2 Schedule/Reporting
The Gateway Gardens Stream Relocation Project will be determined to be successful
after the stream is determined to be stable, vegetation is determined to be healthy and
growing, and two bankfull events have been documented in separate years of the
monitoring period. During vegetation monitoring, planted and volunteer stem densities
will be observed yearly along with the relative abundance and diversity of herbaceous
vegetation within the stream restoration planting area. Survival of woody vegetation will
be evaluated at the end of each growing season just prior to leaf fall.
Monitoring data will be collected for a period of five years or until all success criteria are
achieved, whichever is longer. Annual Reports will be submitted to the COE and DWQ
prior to the end of each calendar year, documenting plant community conditions within
the restoration areas. The project areas will be photographed from permanent photo
stations and changes in any of the above variables will be recorded and included in each
annual report. The Annual Report will also include a proposed plan of action for the
following year including maintenance activities.
Ward Consulting Engineers, P.C. 2 Greensboro Gateway Gardens
January 5, 2009
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