20061617 Ver 6_Modifications_20140519

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WN1 'ALL
Wetland and Natural Resource
Consultants, Inc.
Ms. Jean Gibby
US Army Corps of Engineers
Raleigh Regulatory Field Office
3331 Heritage Trade Drive, Suite 105
Wake Forest, NC 27587
RE: Wendell Falls Permit Modification
USACE AID SAW 2005 -20100
NC DWQ 2oo6 -1617
o CGC��dC� 4
D
MAY 1 9 2014
D tit - m7FR A
April 22, 2014
The purpose of this letter is to request an impact neutral permit modification for the Wendell Falls
development located in Wake County, North Carolina. As detailed below, the applicant proposes to
eliminate two road crossings in order to re- habilitate a failing dam and expand an irrigation source.
The dam embankment and riser structure on a pond located within the development needs to be
brought up to current safe standards. The existing conditions include a six inch PVC outlet (which is
undersized) and sheet flow across the top of the dam (which results from the undersized outlet).
Additionally, the dam is steeper than current safety standards and there are stumps within the
embankment. The structure needs to be rehabilitated.
The applicant has identified that 15 acres within the development will need to be irrigated. Their
preference is to expand the existing pond for the irrigation water instead of using potable water
from a municipal system. The thinking is that a pond will maintain recharge. The applicant has
projected a 1.o to 1.5 acre inch application per week in drought conditions. The applicant has
calculated that 3 acre feet of water will be necessary for 3 weeks of irrigation. In gallons, 15 acres will
require approximately 407,000 gallons of irrigation water. Each acre foot of pond totals
approximately 326,000 gallons. The irrigation demand is projected to drop the water surface
elevation by 4 or more feet during periods of high demand.
Using potable water for irrigation water is irresponsible and expensive. Therefore it was considered
to be a non - viable alternative. Similarly, using multiple wells to generate irrigation waters was
determined to be non - viable.
The following narrative presumes that the submitted design is approved under the Dam Safety
Program. Their review is independent and it is possible that the actual impacts will be slightly more
or less than what is presented here. The applicant proposes to finalize the actual impact amounts
and mitigation based on the approved drawings. Be aware that the proposed drawings were
generated using a "worst- case" set of scenarios and that it is most likely that the actual impacts will
be less than requested. Under this rationale, we propose that we submit the final approved
drawings within 14 days of their receipt. And, at that time, we will finalize the mitigation
requirements.
Sparta Office
170Dew Drop Rd, Sparta, NC 28675

Stream Impacts
The modifications to the dam and pond will result in permanent impacts to 135 linear feet of
moderate quality stream downstream of the embankment. This length will be impacted by
temporary construction areas, embankment fill and the proposed plunge pool. It is very possible
that a small channel can be re- established after construction has been completed.
Additional minor flooding will occur - upstream of the pond. The end of jurisdiction of this
intermittent stream was established approximately 125 feet upstream of the normal pool of the
pond. Approximately 45 linear feet of this reach will be flooded. A stream assessment found the
channel to be of low to moderate quality; score 32.
Stream Mitigation
The applicant proposes to abandon crossing Ri and re- distribute the mitigation to off set impacts for
the dam embankment. The approved road crossing impacted 133 linear feet of stream. The crossing
can be abandoned because the lot yield is not sufficient for the small area of high ground that would
be accessed.
Wetland Impacts
The, majority of the wetland impacts are temporary in nature and result from the need to have safe
working areas; temporary impacts total 0.o6 acres. The embankment will impact 0.03 acres and the
plunge pool will impact 0.03 acres. It is important to note that the plunge pool will have standing
water within it after construction. All temporary impact areas will be seeded with a wetland seed
mix and will be staked with willow.
Wetland Mitigation
The,applicant proposes to abandon crossing R7 and re- distribute the mitigation to off set impacts for
the dam embankment. The approved road crossing impacted o.11 acres of wetlands. The crossing
can be abandoned because the lot yield is not sufficient for the small area of high ground that would
be accessed.
Thank you for your time and consideration. We look forward to working with your office on this
project and please contact me at 336.4o6.0906 with any questions that you might have.
Best regards,
0,,*WA
Chris Huysman
cc: Ms. Jennifer Burdette
NC DWR 401 Permitting
1650 Mail Service Center
Raleigh, NC 27699

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PRELIMINARY Y UT
FOR ILLUSTRAtfIVE
PURPOSES 0141LY L;�-J If I
MUL I -FAMIL
SITE
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lip _ 1
April 11, 2014
Permit Modification
Impacts to be Re- distributed
Wendell Falls, Wake County, NC
USACE: 2005-20100
NC DWQ: 20o6 -1617
Sheet 1 of 1
Approved Impact R -7
o.11 acres
N ROAD TO BE
POOLE ROAD
2&G2
LAKE
MYRA
Approved Impact R -1
r
133 linear feet
DADWAY CROSSING GRAPHIC SCALE
_EWER CROSSING 2000 0 1000 2000 4(W
= GREENWAY GROSSING
M - FORCE MAIN CROSSING
LW WATER LINE CROSSING 1 inch = 2000 ft.
WENDELL FALLS OVERALL WITHERS {- RAVENEL
STREAM IMPACT MAP ENGINEERS 1 PLANNERS 1 SURVEYORS
MWIAI WAKFCUUNN NURMI, Ak1A1N\ ,�,.,�..,.,,,.... �.. .4..<.0... »�� �. .�.,.>,�« �.�..,... .......m,,.
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q(� 1
April 11, 2014
Permit Modification
Impacts to be Re- distributed
Wendell Falls, Wake County, NC
USACE: 2005-20100
NC DWQ: 20o6 -1617
Sheet 1 of 1
Approved Impact R -7
o.11 acres
N ROAD TO BE
POOLE ROAD
2&G2
LAKE
MYRA
Approved Impact R -1
r
133 linear feet
DADWAY CROSSING GRAPHIC SCALE
_EWER CROSSING 2000 0 1000 2000 4(W
= GREENWAY GROSSING
M - FORCE MAIN CROSSING
LW WATER LINE CROSSING 1 inch = 2000 ft.
WENDELL FALLS OVERALL WITHERS {- RAVENEL
STREAM IMPACT MAP ENGINEERS 1 PLANNERS 1 SURVEYORS
MWIAI WAKFCUUNN NURMI, Ak1A1N\ ,�,.,�..,.,,,.... �.. .4..<.0... »�� �. .�.,.>,�« �.�..,... .......m,,.

1 U AS CE AID# _'ZCX'YV ' 20 \ 00 " 2..y r
Z' DWQ,# �,��1— Site # (indicate on attached map)
STREAM QUALITY ASSESSMENT 'WORKSHEET
Provide the following information for the - stream reach under assessment:
1.,Apphcant's,name r�l \a `Qkki 2. Evaluator',s name V �
3. Date of evaluation L 'Z Q\4- 4. Time�of evaluation-.
5. Name of stream- tAM12- �` s - - 6. River basin is , —XS5'
7.,A0proximate,drainage area: i t5- 8. Stream order.
9. L' ength' of reach evaluated aT, 'Ur 10. County l�
11. Site,coordinates (if known) —T ^p-�refer /in decimal,degrees 12.- Subdivision name (if any) �a
Latitude (ex 34,872312)* �, l 1 ZV Longitude (ex -7755566_1 1). � 7 s � 6 'k
Metliod location detemimed•(circle) GP Topo Sheet Ortho (Aerial) Photo /GiS Other GIS Other
13. Location of reach undei ,evaluation;(note nearby roads and IandmaFks and attach map identifying stream (s)•location)
14. Proposed channel work (if any)
15. Recent weather conditions \A
oo v,K)
16. Site conditions,at time of visit* n�' Tr
17. Identify any special waterway classifications known _Section 10 _Tidal Waters _Essential Fisheries. Habitat
_Trout Waters _Outstanding Resource Waters _ Nutrient Sensitive Waters _Water Supply Watershed (i -1V)
18. Is there a pond or lake located upstream of the,evaluation point? YES 0 If,yes, estimate the water surface -area:
19. Does-channel, appear on USGS quad map? YES NO 20. Does channel appear on USDA Soil Survey? YES NO
21. Estimated watershed land use % Residential % Commercial _% Industrial _% Agricultural
('-7 % Forested IN Cleared / Logged, _% Other
22. Bankfull width �t 23 Bank height,(from bed to top of bank) -' `, -
24. Channel slope down center of stream. _Flat (0 to-2 %) Gentle (2 to 4 %) _Moderate (4 to 10 %) _Steep ( >I0 %)
25. Channel sinuosity Straight !� Occasional bends _Frequent meander =Very sinuous _Braided channel
Instructions for completion of worksheet (located ompage 2): Begin by determining'the most iappropriate ecoregion based on.
location,, terrain, vegetation, stream classification, etc Every characteristic must be scored using the.same ;ecoregion Assign points
to each characteristic within the range shown for the ecoregion. Page 3 provides a brief description of how to review the
characteristics identified in the worksheet Scores should reflect an overall assessment of the stream reach under evaluation If a
characteristic cannot be evaluated due to site or weather conditions, enter'0 in the scoring box and provide,an explanation in the
comment section Where there are obvious changes in the character of a stream under review (e g , the stream flows from a pasture
into a forest), the stream may be divided into - smaller reaches that display more continuity, -and a separate form used to'evaluate each
reach The total score assigned to a stream reach must range between 0 and 100, with a- score -of 100,representing a stream of the
highesi,quality.
Total Score (from reverse):` Comments:
Evaluator's Signature M "i v" 4 >< 'adz ' L1 NN V ro 43'i" — Date
This channel evaluation rm is intended to be used only -as,a guide to assist - landowners and environmental professionals in
gathering the data required by the -United' States Army Corps of Engineers to make a preliminary assessment of stteam
quality. The total score resulting from the coipletion of this form is subject to ,USACE approval and does not imply a
particular mitigation`ratio or requirement. Form'sbbject to change - version 06%03 To Comment;, please�call,919- 876 -8441 x'26-

STREAM QUALITY ASSESSMENT WORK-SHEET
These clfaract&hsttcs are not assessed in coastal streams
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