20150585 Ver 1_401 Application_20150615

Dewberry
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.June 12, 2015
1Is. Karen Higgins
401 and Buffer Permitting Unit
NC Division of Water Resources
1617 Mail Service Center
Raleigh, North Carolina 27699 -1650
Dewberry Engineers Inc.
2301 Rexwoods Drive, Suite 200
Raleigh, NC 27607 -3366
919.881.9939
919.881.9923 fax
www.dewberry.com
Reference: City of Raleigh
Blenheim Culvert Repairs /Stream Relocation Sanitary Sewer Protection
WQC #3883, #3890 Application
Dewberry Project No. 50060186
Dear Ms. Higgins:
Enclosed are five copies of a Pre - Construction Notification (PCN) Permit Application Package for the City
of Raleigh Blenheim Culvert Repairs /Stream Relocation Sanitary Sewer Protection project. For your
review we have enclosed five copies of the PCN Application Form, Attachment A — Additional
Information, USGS Quadrangle Map, Soil Survey Map, site photos, site plan with typical construction
details, and the application fee.
The project titled "Blenheim Culvert Repairs /Stream Relocation Sanitary Sewer Protection" consists of
relocating a stream channel away from the immediate vicinity of a sanitary sewer line that has become
exposed and threatens the property owner's residence. This activity will occur in sanitary sewer easements
that have not been maintained in the last 10 years and on the 817 and 821 Blenheim properties owned by
Ms. Betty Twiggs. This project also includes the repair of a collapsed culvert and headwall on the 3301
Marblehead Lane property.
The construction described in this permit will result in a net stream loss of 147 linear feet and a net loss of
2,80o square feet of zone 1 and 4,700 square feet of zone 2 buffer. An additional 8,700 square feet of zone
1 and 2,715 square feet of zone 2 buffer will be temporarily impacted due to disturbance necessary to
perform the construction.
Please contact me with any questions regarding this permit application.
Sincerely,
Dewberry Engineers Inc.
P�.�
Beth Steffens, PE
Enclosures
CC: David Schaeffer, U.S. Army Corps of Engineers; Rachelle Rhodes, Public Utilities
P: \5oo6o186 \Adm \Permits

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Form Version 1.4 January 2009
Pre - Construction Notification ,(PCN) Form
A. Applicant Information
1. Processing
1a. Type(s) of approval sought from the Corps: I ❑X Section 404 Permit ❑ Section 10 Permit
1b. Specify Nationwide Permit (NWP) number: 3 and 29 or General Permit (GP) number:
1c. Has the NWP or GP number been verified by the Corps? ❑X Yes ❑ No
1 d. Type(s) of approval sought from the DWQ (check all that apply):
❑X 401 Water Quality Certification — Regular ❑ Non -404 Jurisdictional General Permit
❑ 401 Water Quality Certification — Express ❑X Riparian Buffer Authorization
1e. Is this notification solely for the record For the record only for DWQ For the record only for Corps Permit:
because written approval is not required? 401 Certification:
❑ Yes ❑X No Yes ❑ No
1f. Is payment into a mitigation bank or in -lieu fee program proposed for
mitigation of impacts? If so, attach the acceptance letter from mitigation bank ❑ Yes ❑X No
or in -lieu fee program.
1g. Is the project located in any of NC's twenty coastal counties. If yes, answer 1 h ❑ Yes ❑X No
below.
1h. Is the project located within a NC DCM Area of Environmental Concern (AEC)? ❑ Yes ❑X No
2. Project Information
2a.
Name of project:
Blenheim Stream Relocation and Culvert Repair
2b.
County:
Wake
2c.
Nearest municipality / town:
City of Raleigh
2d.
Subdivision name:
2e.
NCDOT only, T.I.P. or state project
no:
3.
Owner Information
3a.
Name(s) on Recorded Deed:
3b.
Deed Book and Page No.
3c.
Responsible Party (for LLC if
applicable):
City of Raleigh (Public Utilities Department)
3d.
Street address:
( 222 W. Hargett Street
3e.
City, state, zip:
I Raleigh, NC 27601
3f.
Telephone no.:
1 919 - 996 -4540
3g.
Fax no.:
919- 857 -4545
3h.
Email address:
I�
;XIN Z015
UENR - WATER RESOURCES
401 8 BUF .�
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I
Page 1 of 10
PCN Form — Version 1.4 January 2009

4. Applicant Information (if different from owner)
4a. Applicant is: ❑X Agent ❑ Other, specify:
4b. Name:
4c. Business name
(if applicable):
4d. Street address:
4e. City, state, zip:
Ij 4f. Telephone no.:
tI 4g. Fax no.:
14h. Email address:
5. Agent/Consultant Information (if applicable)
5a.
Name:
Elizabeth B. Steffens, PE
5b.
Business name
Dewberry Engineers Inc. (Dewberry)
(if applicable):
5c.
Street address:
2301 Rexwoods Drive Suite 200
5d.
City, state, zip:
Raleigh, NC 27607
5e.
Telephone no.:
984 - 232 -6795
5f.
Fax no.:
919 - 881 -9923
5g.
Email address:
[e-mail]
Page 2 of 10

B. Project Information and Prior Project History
1. Property Identification
1a. Property identification no. (tax PIN or parcel ID):
1b. Site coordinates (in decimal degrees): I Latitude: 35.8269
1 c. Property size:
2. Surface Waters
2a. Name of nearest body of water to proposed project:
2b. Water Quality Classification of nearest receiving water:
2c. River basin:
10795665073 and 0795657901
Longitude: - 78.6742
1.42 acres
Crabtree Creek
C;NSW
Neuse
3. Project Description
3a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this
application:
See Attachment A -Additional Information
3b. List the total estimated acreage of all existing wetlands on the property: 0
1 3c. List the total estimated linear feet of all existing streams (intermittent and perennial) on the property: 507
3d. Explain the purpose of the proposed project:
See Attachment A - Additional Information
3e. Describe the overall project in detail, including the type of equipment to be used:
See Attachment A - Additional Information
4. Jurisdictional Determinations
4a. Have jurisdictional wetland or stream determinations by the ❑ Yes ❑ No ❑X Unknown
Corps or State been requested or obtained for this property /
project (including all prior phases) in the past? Comments:,
4b. If the Corps made the jurisdictional determination, what type Preliminary ❑ Final
of determination was made?
4c. If yes, who delineated the jurisdictional areas? Agency /Consultant Company: U.S. Army Corps of Engineers
Name (if known): David Schaeffer Other:
4d. If yes, list the dates of the Corps jurisdictional determinations or State determinations and attach documentation.
June 1. 2015
5. Project History
5a. Have permits or certifications been requested or obtained for I ❑ Yes ❑ No ❑X Unknown
this project (including all prior phases) in the past?
5b. If yes, explain in detail according to "help file" instructions.
6. Future Project Plans
6a. Is this a phased project?
6b. If yes, explain.
❑ Yes ❑X No
Page 3 of 10
PCN Form — Version 1.4 January 2009

G
C. Proposed Impacts Inventory
1. Impacts Summary
1 a. Which sections were completed below for your project (check all that apply):
❑ Wetlands ❑X Streams
— tributaries ❑X Buffers ❑ Open Waters ❑ Pond Construction
2. Wetland Impacts
If there are wetland impacts proposed on
the site, then complete this question for each wetland area impacted.
2a. 2b.
2c. 2d. 2e.
2f.
Wetland impact Type of impact
Type of wetland Forested Type of jurisdiction
Area of
number
Corps (404,10) or
impact
Permanent (P) or
DWQ (401, other)
(acres)
Temporary (T)
W1
Choose one
Choose one Yes /No -
W2
Choose one
Choose one Yes /No
W3
Choose one
Choose one Yes /No
W4
Choose one
Choose one I Yes /No
W5
Choose one
Choose one
I Yes /No
W6 Choose one
Choose one
Yes /No
2g. Total Wetland Impacts:
2h. Comments:
3. Stream Impacts
If there are perennial or intermittent stream impacts (including temporary impacts) proposed on the site, then complete this
question for all stream sites impacted.
3a. 3b.
3c. 3d. 3e. 3f.
3g.
Stream impact Type of impact
Stream name Perennial (PER) or Type of Average
Impact
number
intermittent (INT)? jurisdiction stream
length
Permanent (P) or
width
(linear
Temporary (T)
(feet)
feet)
31 P I Fill
UT to Crabtree Creek I INT I DWQ 8 I
-233
S2 P
Relocation
UT to Crabtree Creek I INT I DWQ 8 I
86
S3
Choose one
S4 I
Choose one
S5 I Choose one
S6 I Choose one
3h. Total stream and tributary impacts
147
3i. Comments:
The goal of the stream location is to minimize to the extent possible stream bank erosion that could threaten the sanitary sewer line and home structure
at 817 Blenheim Drive. Approximately 233 LF of the creek will be abandoned and a new channel, approximately 86 LF in length will be established,
resulting in a net 147 LF stream loss.
Page 4 of 10
PCN Form — Version 1.4 January 2009

4. Open Water Impacts
If there are proposed impacts to lakes, ponds, estuaries, tributaries,
sounds, the Atlantic Ocean, or any other open water of
the U.S. then individually list all open water impacts below.
impacts
below. If any impacts require mitigation, then you MUST fill out Section D of this form.
4a. 4b. 4c.
4d. 4e.
Open water Name of waterbody
❑ Other:
impact number (if applicable)
Type of impact
Waterbody Area of impact (acres)
Permanent (P) or
Buffer Impact Reason for impact
type
Temporary (T)
Zone 2
number -
101 I
Choose one
I Choose
O2
required?
Choose one
I Choose
O3 I
Choose one
I Choose
O4 I
Choose one
I Choose
4f. Total open water impacts
4g. Comments:
5. Pond or Lake Construction
If pond or lake construction proposed, then complete the chart below.
5a. 5b. 5c. 5d.
Pond ID number Proposed use or Wetland Impacts (acres) Stream Impacts (feet)
purpose of pond
Flooded Filled I Excavated Flooded Filled Excavated
P1 Choose one
P2 Choose one
5f. Total:
59. Comments:
5h. Is a dam high hazard permit required? ❑ Yes ❑ No If yes, permit ID no:
5i. Expected pond surface area (acres):
5j. Size of pond watershed (acres):
5k. Method of construction:
5e.
Upland
(acres)
0
6. Buffer Impacts (for DWQ)
If project will impact a protected riparian buffer,
then complete the chart below. If yes, then individually list all buffer
impacts
below. If any impacts require mitigation, then you MUST fill out Section D of this form.
6a. Project is in which protected basin?
❑X Neuse ❑ Tar - Pamlico ❑ Catawba ❑ Randleman
❑ Other:
6b. 6c.
6d. 6e. 6f.
6g.
Buffer Impact Reason for impact
Stream name Buffer
Zone 1
Zone 2
number -
mitigation
impact
impact
Permanent (P) or
required?
(square
(square
Temporary (T)
feet)
feet)
B1 P Buffer lost due to relocation
UT of Crabtree Creek No
-6,800
-8,100
B2 P New buffer segment
UT of Crabtree Creek I No
4,000
3,400
B3 T Construction I
UT of Crabtree Creek
No
I
2,600
840
B4 T Construction
UT of Crabtree Creek
I No I
1,800
75
B5 T Construction
UT of Crabtree Creek I No
I
4,300
1,800
B6 I
I Yes /No
6h. Total Buffer Impacts:
5,900
-1,985 i
6i. Comments: Estimated 6,800sf area of Zone 1
and 8,100sf of Zone 2 buffer will be lost due to the abandoned stream segment. The new stream
segment will restore 4,000sf of Zone 1, and 3,400sf of Zone 2 buffer, resulting in a net loss of 2,800 sf Zone 1 and 4,700 Zone 2.
Page 5of10

D. Impact Justification and Mitigation
1. Avoidance and Minimization
1a. Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
See Attachment A - Additional Information
1 b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques.
The placement of rip -rap will be limited to the area immediately around the new stream bank and will not intrude into the stream. A pump- around or
coffer dam will be used during construction to ensure all work occurs in the dry. After construction is completed the disturbed area will be covered with
coir matting, mulched, and reseeded. The riparian buffer area will also be re- vegetated with native plant species.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for ❑ Yes ❑X No
impacts to Waters of the U.S. or Waters of the State?
2b. If yes, mitigation is required by (check all that apply): ❑ DWQ ❑ Corps
❑ Mitigation bank
2c. If yes, which mitigation option will be used for this ❑ Payment to in -lieu fee program
project?
❑ Permittee Responsible Mitigation
3. Complete if Using a Mitigation Bank
3a. Name of Mitigation Bank:
Type: Choose one Quantity:
3b. Credits Purchased (attach receipt and letter) Type: Choose one Quantity:
Type: Choose one Quantity:
3c. Comments:
4. Complete if Making a Payment to In -lieu Fee Program
4a. Approval letter from in -lieu fee program is attached. ❑ Yes
4b. Stream mitigation requested: linear feet
4c. If using stream mitigation, stream temperature: Choose one
4d. Buffer mitigation requested (DWQ only): square feet
4e. Riparian wetland mitigation requested: acres
4f. Non - riparian wetland mitigation requested: acres
4g. Coastal (tidal) wetland mitigation requested: acres
4h. Comments:
5. Complete if Using a Permittee Responsible Mitigation Plan
5a. If using a permittee responsible mitigation plan, provide a description of the proposed mitigation plan.
Page 6 of 10
PCN Form — Version 1.4 January 2009

6. Buffer Mitigation (State Regulated Riparian Buffer Rules) — required by DWQ
6a. Will the project result in an impact within a protected riparian buffer that requires Yes ❑X No
buffer mitigation?
6b. If yes, then identify the square feet of impact to each zone of the riparian buffer that requires mitigation. Calculate the
amount of mitigation required.
6c. 6d. 6e.
Zone Reason for impact Total impact Multiplier Required mitigation
(square feet) (square feet)
Zone 1
3 (2 for Catawba)
Zone 2 1.5
6f. Total buffer mitigation required:
6g. If buffer mitigation is required, discuss what type of mitigation is proposed (e.g., payment to private mitigation bank,
permittee responsible riparian buffer restoration, payment into an approved in -lieu fee fund).
6h. Comments:
Page 7 of 10

E. Stormwater Management and Diffuse Flow Plan (required by DWQ)
1. Diffuse Flow Plan
1 a. Does the project include or is it adjacent to protected riparian buffers identified Yes ❑ No
within one of the NC Riparian Buffer Protection Rules?
1 b. If yes, then is a diffuse flow plan included? If no, explain why.
Project will not alter diffuse flow patterns.
❑ Yes Fxl No
2. Stormwater Management Plan
2a. What is the overall percent imperviousness of this project? 0
2b. Does this project require a Stormwater Management Plan? ❑ Yes 0 No
2c. If this project DOES NOT require a Stormwater Management Plan, explain why:
Disturbed area will be less than 1 acre.
2d. If this project DOES require a Stormwater Management Plan, then provide a brief, narrative description of the plan:
2e. Who will be responsible for the review of the Stormwater Management Plan?
3. Certified Local Government Stormwater Review
3a. In which local government's jurisdiction is this project?
3b. Which of the following locally - implemented stormwater management programs
apply (check all that apply):
3c. Has the approved Stormwater Management Plan with proof of approval been
attached?
4. DWQ Stormwater Program Review
4a. Which of the following state - implemented stormwater management programs apply
(check all that apply):
4b. Has the approved Stormwater Management Plan with proof of approval been
attached?
5. DWQ 401 Unit Stormwater Review
5a. Does the Stormwater Management Plan meet the appropriate requirements?
5b. Have all of the 401 Unit submittal requirements been met?
City of Raleigh
❑ Phase II
❑ NSW
❑ USMP
❑ Water Supply Watershed
❑X Other: None
❑ Yes ❑ No
❑Coastal counties
❑HQW
❑ORW
❑Session Law 2006 -246
❑X Other: None
❑ Yes ❑ No
❑ Yes ❑ No
❑ Yes ❑ No
Page 8 of 10
PCN Form — Version 1.4 January 2009

F. Supplementary Information
1. Environmental Documentation (DWQ Requirement)
1 a. Does the project involve an expenditure of public (federal /state /local) funds or the ❑X Yes ❑ No
use of public (federal /state) land?
1b. If you answered "yes" to the above, does the project require preparation of an
environmental document pursuant to the requirements of the National or State ❑ Yes ❑X No
(North Carolina) Environmental Policy Act (NEPA/SEPA)?
1c. If you answered "yes" to the above, has the document review been finalized by the
State Clearing House? (If so, attach a copy of the NEPA or SEPA final approval
letter.) ❑ Yes ❑ No
Comments:
2. Violations (DWQ Requirement)
2a. Is the site in violation of DWQ Wetland Rules (15A NCAC 2H .0500), Isolated
Wetland Rules (15A NCAC 2H .1300), DWQ Surface Water or Wetland Standards, ❑Yes ❑X No
or Riparian Buffer Rules (15A NCAC 26 .0200)?
2b. Is this an after - the -fact permit application? F1 Yes ❑X No
2c. If you answered "yes" to one or both of the above questions, provide an explanation of the violation(s):
3. Cumulative Impacts (DWQ Requirement)
3a. Will this project (based on past and reasonably anticipated future impacts) result in El Yes ❑X No
additional development, which could impact nearby downstream water quality?
3b. If you answered "yes" to the above, submit a qualitative or quantitative cumulative impact analysis in accordance with the
most recent DWQ policy. If you answered "no," provide a short narrative description.
Project will not result in additional land development.
4. Sewage Disposal (DWQ Requirement)
4a. Clearly detail the ultimate treatment methods and disposition (non- discharge or discharge) of wastewater generated from
the proposed project, or available capacity of the subject facility.
No wastewater will be generated during this project.
Page 9 of 10
PCN Form — Version 1.4 January 2009

5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or ' ❑ Yes ❑ No
habitat?
5b. Have you checked with the USFWS concerning Endangered Species Act ❑ Yes ❑ No
impacts?
5c. If yes, indicate the USFWS Field Office you have contacted. -
5d. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical
Habitat?
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as essential fish habitat? ❑ Yes ❑ No
6b. What data sources did you use to determine whether your site would impact Essential Fish Habitat?
7. Historic or Prehistoric Cultural Resources (Corps Requirement)
7a. Will this project occur in or near an area that the state, federal or tribal
governments have designated as having historic or cultural preservation ❑ Yes ❑ No
status (e.g., National Historic Trust designation or properties significant in
North Carolina history and archaeology)?
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA- designated 100 -year floodplain?
8b. If yes, explain how project meets FEMA requirements:
❑ Yes
8c. What source(s) did you use to make the floodplain determination?
FEMA FIRM Map #3720079500J, Effective May 2, 2006
--Ruffin L. Hall
City Manager
City of Raleigh _
Post Office Box 590
Raleigh, North Carolina 27602 Iicant/A ent's Signature
Applicant/Agent's Printed Name g g
(Agent' signature is valid only if an authorization
letter from the applicant is provided.)
Page 10 of 10
❑X No
G`'lo-13
Date

Attachment A —Additional Information
3.3.a Describe existing conditions and land use:
Extreme oxbowing and streambed deepening of an unnamed tributary of Crabtree Creek has eroded the stream
bank and threatens the integrity of sanitary sewer lines. Oxbowing of the stream has exposed bell joints in the fl-
inch ductile iron sanitary sewer gravity line, and the sanitary sewer line is now approximately five feet above the
bottom of the stream bed due to natural streambed deepening. The undercutting of the stream bank at the oxbow
is naturally forcing the stream towards the property owner's home, posing a threat to the integrity of the
structure. Land use in the vicinity of the area is residential.
3.3.d Explain the purpose of the proposed project
The purpose of the proposed project is to relocate the stream channel away from the immediate vicinity of the
sanitary sewer line and property owner's residence to prevent damage to the sanitary sewer infrastructure and
property.
As part of this construction project, a collapsed culvert and headwall will be repaired and replaced at the 3301
Marblehead Lane property that is across the street from the 821 Blenheim property.
3.3.e. Detailed project description including equipment to be used
Oxbowing and streambed deepening threatens the integrity of a sanitary sewer line and property owner's
residence. The sanitary sewer line is located within an easement that has not been maintained in the last 10 years.
A pump around or coffer dam will be used during construction to ensure all work occurs in the dry. Construction
activity will consist of clearing an area to access the project location, excavating a new stream channel, and
filling /grading the existing channel to move the stream away from the sanitary sewer line and residence. Channel
blocks will be installed to prevent re- cutting of the old stream channel and rip -rap will be placed along the new
stream channel to prevent further erosion. A cross -vane will be installed in the new stream channel to provide
energy dissipation. Native streambed material (to a 1ft depth) will be raked out of the section of stream to be
abandoned and will be stored until a new channel is formed. The reserved stream bed material will be placed in
the new stream channel prior to removal of the pump around. The excavated and graded area will be covered with
coir matting and reseeded to prevent erosion. Stream bank stabilization details are attached with this application.
Conventional construction equipment (hydraulic excavators and dumptrucks) will be used. The buffer disturbance
will be seeded and mulched. Traditional sediment control devices and conventional construction equipment will be
used.
D.1.a Specifically describe measures taken to avoid or minimize the proposed impacts in designing project.
The new stream channel was designed to provide adequate meandering and velocity reduction to reduce future
natural channel movements in this area. The placement of rip -rap will be limited to the area immediately around
the new stream bank and will not intrude into the stream. A pump- around or coffer dam will be used during
construction to ensure all work occurs in the dry. A cross vane will be installed to provide energy dissipation in the
new stream channel and allow for a gradual slope of the channel. After construction is completed the disturbed
area will be covered with coir matting, mulched, and reseeded. The riparian buffer area will also be re- vegetated
with native plant species.

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Blenheim Culvert Repair /Stream Restoration Sanitary Sewer Protection
Conditions
Figure 1: Facing north -west. Oxbowing of the stream has
exposed bell joint along the sanitary sewer line. The
sanitary sewer aerial is approximately 6 feet above the
streambed due to natural streambed deepening.
Figure 2: Facing north -east. Oxbowing of
stream has pushed the streambank towards
the homeowner's property, threatening the
structure.

Blenheim Culvert Repair /Stream Restoration Sanitary Sewer Protection
Existing Site Conditions
Figure 3: Facing east, on the north side of the oxbow. Figure 4: Facing east, on south side of oxbow. Sanitary sewer
Sanitary sewer aerial is approximately 6 feet above aerial is approximately 6 feet above the bottom of the
the bottom of the streambed, with exposed bell streambed with exposed bell joints.
joints.

Blenheim Culvert Repair /Stream Restoration Sanitary Sewer Protection
Existing Site Conditions
Figure 5: Facing northwest. Culvert and
headwall collapse.

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2301 RE GODS DRIVE
SUITE 200
RALEIGH, NC 27007
PHONE; 919.981.9939
FAX: 919MIM23
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i
CONDITIONS
I
PROJECT NO. 50060186
SHEET NO, 1 OF

BACKFILLED CHANNEL
ON
L
Y 5'
TOP W
ID
TH
I
S
SH
OW
N
ON THE PLANS, CHANNEL BLOCK
SHALL, BE CONSTRUCTED AS
SHOWN IN THIS DETAIL.
FINISHED GRADE 1,5'
5` MIN.
5'MIN.
I
NO, 57 STONE
COMPACTED
BACKFILL
3./
CLASS I RIP RAP PAC I I D
1.5:1 SLOPE L` SLOPE BACKFILL
RES I ORA I ION
C'HA,'\\I,I_ IN\ FR I
CHANNELBLOCK
N.T,S
APPROXIMATE EXISTING GROUND
TIE TOORADE T MIN
COIR MATTING ON
AREAS 3:1 OR STEEPER
(SEE COIR MATTING NOTES FOR PROPER INSTALLATION)
a
ym
GEOTEXTILE FABRIC -j
*��li
A
1. RIP RAP AND GEOTEXTILE ALONE SHOULD NOT BE USED ON SLOPES GREATER THAN 2H:1V,
2. ON SLOPES BETWEEN 2H:1V AND 1.5H:1V RIP RAP WY BE BEDDED IN 12" OF #57 STONE. CONSULT ENGINEER PRIOR To
INSTALLATION.
3. THICKNESS OF RIP RAP (T) SHOULD BE NO LESS T 1.5 X D50 (USE 18- FOR CLASS 1).
4. DEPTH OF THE TOE SHOULD BE APPROXIMATELY 1.5 X. THICKNESS (USE 18- FOR CLASS 1).
5. RIP RAP SLOPE PROTECTION IS MODIFIED FROM VDH AND NCDENR LAND QUALITY SECTION EROSION AND
SEDIMENT CONTROL DESIGN MANUAL.
B4 ® 1,800 SQ. FT, ZONE I
75 SQ, FT, ZONE
TEMPORARY IMPACTS
ROCK CHECK DAM--",,,
ORDINARY HIGH WATER MARK-,
( IN FEET )
I inch = 2 ft
9
3301 MAR LE LANE
B F 4,300 SQ, FT, ZONE 1
1,800 SQ, FT, ZONE 2
TEMPORARY IMPACTS
Dewberry Engineers Inc.
2301 REXWOODS DRIVE
SUITE 200
RALEIGH, NO 27607
PHONE: [phone]
FAX: 919.88t9923
NCBELS # F-0929
PROJECT NO. 50060186
B2 = 4,000 SQFT, ZONE + +
3,400 SQ.FT, ZONE 2
kn
10,
NEW RIPARIAN BUFFER
B3 2,600 SQ, FT, ZONE
840 SQ, FT, ZONE 2
TEMPORARY IMPACTS
+
_T-41,
CHANNEL BLOC
%
+
kt,
+
+ +
/+
0
+1
HORIZONTAL
GRAPHIC SCALE
20 0 10 20 40
80
N-QIE-S,
1. NATIVE STREAM BED MATERIAL SHALL BE RESERVED
FOR CHANNEL CONSTRUCTION
EN FEET
AND FILL.
1 inch = 20 ft
2. INSTALL COIR MATTING ON ALL AREAS WITH 3:1 SLOPE CRCREATER.
3. INSTALL CLASS 11 RIP RAP FROM CHANNEL BOTTOM
TO BANKFULL DEPTH
OF 4 FT.
4. SEE CROSS SECTION DETAIL STREAM BANK STABILIZATION FOR DETAILS TO STABILIZE
VERTICAL
RIP RAP/MATTING BARRIER.
GRAPHIC SCALE
5. DISTURBED AREA = 0.41 ACRES
2 0 1 2 4
( IN FEET )
I inch = 2 ft
9
3301 MAR LE LANE
B F 4,300 SQ, FT, ZONE 1
1,800 SQ, FT, ZONE 2
TEMPORARY IMPACTS
Dewberry Engineers Inc.
2301 REXWOODS DRIVE
SUITE 200
RALEIGH, NO 27607
PHONE: [phone]
FAX: 919.88t9923
NCBELS # F-0929
PROJECT NO. 50060186