20120967 Ver 1_More Info Received_20121203

ENVIRONMENTAL SERVICES, INC.
524 South New Hope Road
Raleigh, North Carolina 27610
919 - 212 -1760 / Facsimile 919- 212 -1707
www.environmentalservices.com
MEMORANDUM
TO:
Karen Higgins
FROM:
Charles Johnston
DATE:
November 30, 2012
RE:
DWQ# 12 -0967, Response to Request- for - Additional Information
Please find attached four copies of the additional information requested in your letter of 8 November 2012.
� 12�L51JVC�
DFC 3 2012
Attachments:
Rhinehalt Letter, 28 Nov 2012
Revised Plats for attachment to PCN, Figures 5 -8
Representative Photos
Stream Forms

BRADLEY A. RHINEHALT, PE, PLS
PO BOX 688
Fuquay Varina, NC 27526
PH: 919-538-4826
Ms. Karen Higgins November 28, 2012
NC DENR Division of Water Quality
Stormwater Compliance and Permitting (Webscape) Unit
1650 Mail Service Center
Raleigh, NC 27699 -1650
RE: Garrett Driveway — Request for Additional Information
DWQ #: 12 -0967
Dear Ms. Higgins;
Please find the following responses to your questions and attachments as included from Charles
Johnston with Environmental Services, Inc.
1. Please note that we have buried the outlets of the 42" pipes below the existing channel as noted
on figure 6. We have designed the rip rap outlet protection per the Land Quality requirements in
chapter 6.41 of the North Carolina Erosion and Sediment Control Planning and Design Manual.
This larger rip rap is designed to protect the outlets from erosion due to the velocity of the
water exiting the pipes. The larger rip rap will allow for pools and conduits of water between the
riprap during standing water conditions.
2. We have updated figure 5 showing the buffers and the impacts in both Zone 1 and Zone 2 as
requested.
3. We have shown the buffers on both figures 4 — Existing Conditions and Figure 5 — Plan View. We
have also added combination silt fence /tree protection fencing at the edges of the disturbance
to protect the buffer areas outside the disturbance as shown on Figure 5.
4. The pipe design is due to the large drainage area and subsequent large 100 year runoff of 392
CFS as provided in the FEMA AS report. We have used the FEMA information along with field
surveyed cross sections to perform a FEMA Flood study using HEC RAS to model the pre- existing
flood conditions and the post construction flood conditions as required for a "no rise" to the 100
year flood plain. Due to the very wide and shallow floodplain, we had to design the crossing with
multiple culverts as depicted in these exhibits. We tried multiple combinations to try and
minimize the size and numbers of the pipes and this configuration was the least impact to the
channel. If we tried to use less and larger pipes, we would have needed more cover and fill to
build the road thus leading to additional impacts both upstream and downstream. We added
the headwall to help minimize the slopes and impacts as well.
5. Please see attached documentation and pictures as requested.
Please feel free to contact me or Charles Johnston with Environmental Services, Inc. should you have
any questions or need additional information.
Sincerely,
Bradley Rhinehalt, PE
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DATE. 8_31_2012 FIGURE 6

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Garrett Driveway, Existing Conditions. DWQ # 12 -0967. Photos taken November 29, 2012.

NC DWO Stream Identification Form Version 4.11
Date:
Project/Site: G...04 +at+
Latitude: 3 5 � 1
Evaluator: 15S-T C.0-oAOCIVA
County: bV, AM
Longitude:
Total Points:
Stream Is at least intermittent a 5
'
Stream Determination (circle one)
Ephemeral terimitten Perennial
Other
e.g. Quad Name:
if a 19 orperannial if'a 30•
2. Sinuosity of channel along thalweg
0
A. Geomorphology Subtotal =_asi
Absent
Weak
Moderate
Strong
18' Continuity of channel bed and bank
0
1
2
3
2. Sinuosity of channel along thalweg
0
1
CD
3
3. In- channel structure: ex. riffle -pool, step -pool,
d t ool sequence
0
©
2
3
4. Particle size of stream substrate
0
CD
2
3
5. Activetrelict floodplain
0
Yes 3
2
3
6. Depositional bars or benches
0
1
2
3
7. Recent alluvial deposits
0
0
2
3
e. Headcuts
0
1
2
3
9. Grade control
1
0.5
1
1.5
10. Natural valley
0
0.5
I 1
1.5
11. Second or greater order channel
No = 0
Yes
3
" artificial ditches are not rated; see discussions in manual
B. Hvdroloav (Subtotal = G•O )
12. Presence of Baseflow
0
1
Q
3
13. Iron oxidizing bacteria
0
1
2
3
14. Leaf litter
1.5
1
0.5
0
15. Sediment on plants or debris
0
0.5
1
1.5
16. Organic debris lines or piles
0
0.5
1
1.5
17. Soil -based evidence of high water table?
No = 0
Yes 3
C. Bioloav (Subtotal= . r. 0 )
18. Fibrous roots in streambed
3
M
1
0
19. Rooted upland plants in streambed
2
1
0
20. Mac robenthos (note diversity and abundance)
1
2
3
21. Aquatic Mollusks
1
2
3
22. Fish
0
0.5
1
1.5
23. Crayfish
0
0.5
1
1.5
24. Amphibians
0
0.
1
1.5
25. Algae
0
0.'5_
1
1.5
26. Wetland plants in streambed
FACW = 0.75; OBL =1.5
Other 0
.perennial streams may also be identified using other methods. See
p. 35 of manual.
Notes:
Sketch:

I USACE AID# DWQ # Site # (indicate on attached map)
FE-0-1 STREAM QUALITY ASSESSMENT WORKSHEET
Provide the following information for the stream reach under assessment:
1. Applicant's name: 2. Evaluator's name:
3. Date of evaluation: IB ho 7. 4. Time of evaluation: 10 : 00'a 04
5. Name of stream: wr -1v ftovaiunn r"a k 6. River basin: Nor-4
7. Approximate drainage area:_ d eeq t _ 8. Stream order:, I v #
9. Length of reach evaluated: 1 QCJ 1 10. County: 't yr. 4M
11. Site coordinates (if known): prefer in decimal degrees. 12. Subdivision name (if any): ^-gy
Latitude (ex 34.872312): ai, 1`7111 Longitude (ex. -- 77.556611): " 79 .101
Method location determined (circle): GPS Topo Sheet <tGRG(A erial) Photo Other GIS Other
13. Location of reach under evaluation (note nearby roads and landmarks and attach map identifying stream(s) location):
14. Proposed channel work (if any):, , a �n.•c rM Gt � _� �wu' Ft I�oAGi r ph c S 1 d e,
15. Recent weather conditions: An rfA 1^ k 4+r
16. Site conditions at time of visit: n.
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 -u-JI-N)
18. Is there a pond or lake located upstream of the evaluation point? YES ONIf yes, estimate the water surface area:
19. Does channel appear on USGS quad map? 6?D 0 20. Does channel appear on USDA Soil Survey? (!yg>NO
21. Estimated watershed land use: JQ% Residential _% Commercial % Industrial 60 % Agricultural
_�Q % Forested % Cleared / Logged _% Other (
22. Bankfi ll width: a 23. Bank height (from bed to top of bank): a
24. Channel slope down center of stream: Flat (0 to 2 1/6) ✓ entee (2 to 4 %) Moderate (4 to 10 %) Steep ( >10 %)
25. Channel sinuosity: Straight Occasional bends Frequent meander Very sinuous Braided channel
Instructions for completion of worksheet (located on page 2): Begin by determining the most appropriate ecoregion based on
location, terrain, vegetation, stream classification, etc. Every characteristic musk 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 tinder 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
highest quality. .
Total Score (from reverse): %S q Comments:
Evaluator's Signature Date 3 / 6l ayla
This channel evaluation form inters to a used only as a guide to assist landowners and environmental professionals in
gathering the data required by the 16nited States Army Corps of Engineers to make a preliminary assessment of stream
quality. The total score resulting from the completion of this form is subject to USACE approval and does not imply a
particular mitigation ratio or requirement. Form subject to change - version 06/03. To Comment, please call 919 - 876 -8441 x 26.

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