20210050 Ver 1_DWR Add'l Comment Responses_20210202

SI RALEIGH: 1 Glenwood Avenue, Suite 600, Raleigh, NC 27603
E P OFFICE: 919.789.9977 / FAX: [phone] / WWW.SEPIINC.COM
February 2, 2021
Mr. Rick Trone
NCDEQ-Division of Water Resources, 401 Buffer and Permitting Branch
512 N. Salisbury Street, Suite 942-F
Raleigh, NC 27604
Re: Northern High School Replacement Project (DWR #20210050v1)
Responses to NCDWR Request for Additional Information
Dear Mr. Trone,
The following includes responses to the additional information request received from the N.C. Division of
Water Resources on January 29, 2021:
1. Your application proposed proposes a total of 56,861 square feet of permanent buffer impacts for the
projects. Please submit a modified buffer impact table that specifically lists each type of buffer impact (e.g.
grading, road crossing, utility crossing, etc.) as outlined in 15A NCAC 02B.0714(10).
The buffer impact table has been revised and is attached for review.
2. Please demonstrate why impacts to Riparian Buffer cannot be avoided or minimized by converting the
SCM discharges to Dispersed Flow prior to entering the buffer. In addition, the Division has concerns that the
perpendicular alignment of these discharges may destabilize the receiving stream banks. Please demonstrate
why further minimization cannot be achieved by re -aligning these discharge points to an oblique angle to the
receiving stream. Please address this for Impact Areas 1,2,3,4,7,8 and 9. [15A NCAC 02b .0714 (9), 15A NCAC
02B .06112(2) and 15A NCAC 02H .0506(b)].
The stormwater control measure discharges referenced are for high flow bypass only and are designed per the
City of Durham Stormwater Requirements. The proposed stormwater management plan for the project has
been reviewed and approved by the City of Durham Stormwater Department.
3. Please clarify the need for a 70-foot right-of-way for Site Drive 2/Hebron Road Extension. The Division
believes that impacts to features SE and SD and associated riparian buffers can be further avoided by a
reduction in width of Site Drive 2/Hebron Road Extension right-of-way. The Division understands the
requirements imposed by NCDOT and DCHC-MPO regarding the need for ingress/egress points, safety and
aligning the Hebron with the existing Wellington Drive as proposed and outlined in the Traffic Impact Analysis.
However, it is unclear if the accommodation of the Hebron Road Extension right-of-way portion of the
roadway is necessary to accommodate traffic for site access. Please clarify if Hebron Road Extension is
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SEPI
approved as part of a Transportation Improvement Plan (or similar) or is speculative based on an anticipated
future traffic demands, considering that this roadway extension project is not part of the City -County of
Durham Capital Improvement Plan and has not been scheduled or funded. In addition, please clarify if the
proposed Hebron Road Extension is planned to connect to existing Hebron Road to the east [15A NCAC 02H
.0506(b)(1)].
The Durham -Chapel Hill-Carrboro (DCHC) Metropolitan Planning Organization adopted Comprehensive
Transportation Plan (CTP) shows Hebron Road extending from Denfield Street to Wellington Dive and is titled
the Hebron Road Extension. This extension is classified as a minor thoroughfare.
Since the Hebron Road Extension is classified as a minor thoroughfare, the City of Durham requires a 70 foot
right-of-way with 3 travel lanes, bike lanes and sidewalks on both sides. (i.e. the width of the impact is
determined by the Authority Having Jurisdiction-AHJ).
The City requested that the DPS and the site plan reflect a 70 foot wide land reservation for future right-cf-
way shall the Hebron Road extension ever be constructed. However, this extension is not currently on any
jurisdictional Capital Improvement Plan (CIP) and is not scheduled or funded.
All site improvements shown on the plan submitted are required by authorities having jurisdiction to support a
private site driveway for a high-school use only. Improvements shown are NOT in support of anything having
to do with the future Hebron Road extension.
4. Impact Area 1 (Site Drive 2/Hebron Road Extension) is proposed to impact stream feature SD through the
addition of two culverts, fill and rip rap resulting in 187 linear feet of impact. Information provided in the
application indicates the width of this crossing to be, at least in part, due to the addition of stacking lanes
along the Hebron Road Extension resulting in a much wider road. Please demonstrate why it is infeasible to
begin lane stacking after the crossing of stream feature SD. [15A NCAC o2H .0505(b)(1)].
In a letter from NCDOT, John Sandor, PE District Engineer to Joshua Reinke, PE, Ramey Kemp & Associates, Inc.,
Durham County Public Schools Traffic Engineer hired consultant dated June 17, 2020: (stating improvements
required)
US 501 at Wellington Drive/Site Drive 2
• Site Drive shall be constructed with one ingress lane and three egress lanes. The egress lanes shall consist
of one exclusive left -turn lane with 150 feet of storage, a shared left -through lane, and an exclusive right -turn
lane with 250 feet of storage. The egress shall also contain 100 feet of Internal Protected Storage (IPS) before
any parking or crossing maneuvers.
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SEPI
5. Please provide a detailed engineering plan, profile view, and cross-section of the proposed culvert for
Stream SE. These drawings must include details regarding stream alignment in relation to pipe alinement, pipe
slope, pipe burial, and dissipator pad [15 NCAC 02H. 0502(a)(9)].
Detailed engineering plan & profile views are found on Sheets C-7 and C-8 Culvert Profile. See attached impact
maps.
6. Please explain how the width of the road crossing at Impact Area 5 has been minimized to the maximum
extent practicable. [15 NCAC 02H .0506(b)(1)]
Retaining walls are proposed to reduce the overall slope impacts and minimize long-term bank erosion. A
thirty-foot wide drive is provided to support emergency, service and pedestrian vehicles. An 8-foot wide walk is
provided on the north side for safe pedestrian travel to and from the student parking lot which is used after-
hours for event parking to the stadium. Utilities to support the new school and auxiliary structures run parallel
to the drive on the south side.
7. The angle of stream SD as it enters the proposed culvert at Impact Area 5 is likely to result in accelerated
erosion and underscoring to the area on the outside of this bend as it enters the culvert. Please describe how
potential problems such as erosion and underscoring will be prevented in this area and if an alternate crossing
location has been explored [15 NCAC 02H .0506(b)(1)].
Per NCDOT, the Argonne Drive entrance must include the installation of channelized south bo und/north bound
left turn lanes on US 501. The drive will be constructed as a limited movement intersection with one ingress
and one egress lane. Furthermore, Argonne Drive will be restricted to a right -turn lane only.
The location of this entrance is mandated based on requirements from the DPS in conjunction with the State
Board of Education -NC Department of Public Instruction, the City -County of Durham and the N.C. Department
of Transportation. The guidelines require at least two entrances to the school be accessed from a public road,
that entrances be at least 600 feet apart to comply with public safety standards, and that the entrance be
aligned with Argone Drive.
Other culvert alignments were explored and were determined to result in larger stream impact amounts. An
alignment that betters the flow entrance would lengthen the culvert and would generate an outlet angle that
may not be preferred. Another option may be to place a bend in the middle of the culvert to maximize the
inflow and outflow alignment, but would lengthen the impact and raise questions on how to model.
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SEPI
8. Please clarify that stream impacts were calculated based on stream length, not culvert length and update
impact table if necessary. [15 NCAC 02H. 0502 (a) and (c)].
Stream impacts were calculated based on stream length per [15 NCAC 02H. 0502 (a) and (c)].
9. Mitigation is required for losses of equal to or greater than 300 linear feet of perennial stream. Please
provide a mitigation plan that confirms to the requirements of 15A NCAC 02H .0506. Furthermore, buffer
mitigation is required for some of the prosed buffer impacts. Please submit a mitigation plan in compliance
with 15A NCAC 02B .0295 [15A NCAC 02H 0506 and 15A NCAC 02b. 0714(12)]
A final mitigation plan will be provided once impacts amounts are approved and quantified by both agencies.
10. If the U.S. Army Corps of Engineers request a response to any of the comments received as a result of the
Public Notice, please provide the Division with a copy of your response to the USACE {15 NCAC 02H .0502( c)].
If a response is requested, a copy will be provided to both DWR and USACE.
`
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Permanent
Buffer
Buffer
(P) /
Mitigation
Zone 1
Zone 2
Impact
Impact
Temporary
Stream
Required
impact
impact
Sheet No.
Area No.
(T)
Reason for Impact
Type of Impact
Name
(Y/N)
(sq. ft.)
(sq.ft.)
Road Crossing, Non-
Allowable with
C3
1
P
Perpendicular
Mitigation
SE
Y
14,928
7,119
Road Crossing-
C3
1
P
Perpendicular
Allowable
SD
N
2,619
492
Road Crossing-
Allowable Upon
C3
1
P
Perpendicular
Authorization
SD
N
5,575
0
Road Crossing-
C3
1
P
Perpendicular
Allowable
SD
N
0
3,193
Stormwater Control
Allowable with
C4
2
P
Measure
Mitigation
SD
Y
936
0
Stormwater Control
C4
2
P
Measure
Allowable
SD
N
0
698
Stormwater Control
Allowable with
C4
3
P
Measure
Mitigation
SD
Y
906
0
Stormwater Control
C4
3
P
Measure
Allowable
SD
N
0
631
Stormwater Control
Allowable with
C4
4
P
Measure
Mltigation
SD
Y
853
0
Stormwater Control
C4
4
P
Measure
Allowable
SD
N
0
609
Road Crossing-
05
5
P
Perpendicular
Allowable
SD
N
847
672
Road Crossing-
05
5
P
Perpendicular
Allowable
SD
N
3,778
2,408
Road Crossing-
05
5
P
Perpendicular
Allowable
SD
N
3,014
1,738
Utility-Sewer-
C6
6
P
Replacement
Allowable
SD
N
282
742
Stormwater Control
Allowable with
C6
7
P
Measure
Mitigation
SD
Y
943
0

Stormwater Control
C6
7
P
Measure
Allowable
SD
N
0
655
Stormwater Control
Allowable with
C6
8
P
Measure
Mitigation
SD
Y
1,024
0
Stormwater Control
C6
8
P
Measure
Allowable
SD
N
0
670
Stormwater Control
Allowable with
C6
9
P
Measure
Mitigation
SA
Y
914
0
Stormwater Control
C6
9
P
Measure
Allowable
SA
N
0
615
TOTAL BUFFER IMPACTS
36,619�20,
242

IMPACT AREA #8
(see sheet C-6)
%//�C� r
IMPACT AREA #9
y1
a (see sheet C-6)
APPLICANT INFORMATION:
OMM Dulls"0WACE' RRMW HALL
2MI HAWK MW
(M)-W0--2W4
119NAWHAIL.OPSNGMir
IN
IMPACT AREA #7
III�IIII Illl (Ill IIIII►1
I/I)I IIII I/ I/ , / (see sheet C— 3) '" s
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I /Ill 1 Illl/// //!lll�lll I ///
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I I I I 1 I l \ \� \� ��\ \\\\\\\\111 �I�1i/ /�i�%%�//�/////�////�/ �/ / //'1 (1 � / 11 1 � // /�� \ l I I \ .\
Ij I �III1�1\I
IMPACT AREA #5
\\ \ \ (see sheet C-5)
IMPACT AREA #4
(see sheet C-4)
IMPACT AREA #2 \)�llll
(see sheet C-4) 11/i)�I
I
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It
/ 11
�j// //�//(I / /// ^\ \\ \� \ III ( \ \ . \ ..•��, .• •. —L
IMPACT AREA #6
//�� ���\II► %%XX/v (see sheet C-6)
Ai
\
,/ ,,//// //j // iii%/// � 1 III /ii jl -- \ \� � \ \ \\ � — \ •`�°••` /I f
/
IMPACT AREA #3
/ (see sheet C-4)
111 /ll // �/ / / I� \�\ \ � � \ 1` ��"�J,--� � \ \� \ \ \ .::ti:•.: // /� /
.••�;�:,:
I r/ (I I a9snNc 36' CMP CULVERT 19 LE it 11\\�� \\ 1:j!
.
i / o9snNc ooueLE sa' RCP cuu�Rr 12 LF +��'�Ty.�..:•...
IMPACT AREA #1 \ it
(see sheet C-3) ►��\I \ I / / j \\—� i // !� ��� //'�✓/i f
GRAPHIC SCALE
vm a roo rm a w
( IN 7nT
1 inch — ON 1L
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
Owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I Electrical/Plumbing Engineer
PDC Engineers
3101 Poplarwood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and Envelope Design
Rick Nuhn Engineering
1913 Thayer Circle
Greensboro, NC 27407
336-855-1182
Food Design
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
SEAL I DATE 10/05/2020
PRELIMINARY -
NOT FOR CONSTRUCTION
PROJECTNO. 02000.000
SHEET TITLE
C-1
OVERALL EXISTING
CONDITIONS PLAN
SHEETNUMBER

,r�,► 51
REA
8IMPACT AREA 9
fit; {► �� �S_ „•„ � I,i �
j
(see sheet / i '✓'�
j • '� fit: �..
(see sheet C-6)
OAN
IMPACT AREA #7
"MIN 111I
11 I�A�� \ 1C`�• � ,�'1 y���i� I I'.•//A'//lA�� _
I ALLOWABLE
943 SQFTI L
I■� niirriQ�NVI • I IKL
�3 I _e sheet C MA
I(s
ra
1�F
J� if
Sys_ ►�_�s�;= F�rft C
I �y
- `
ZONE I- ALLOWABLE - 3,778 SQF ZONE 1- ALLOWABLE -
jG wi w1U 11 � rl-zw
44
lot V0.111
Ll
SOFT
.�Vi/1I�/P_iG��.i�r��! •li��li
1 v,��t>Sif/i�fLN �L `Qll�if/I
•�(��_�_!/ a J _ r'�►
(see sheet •Off
li - - ram. 1�1 ,:.►.,.. u_ ,,, �..:•
�Iy■!-� ��J"' •� / ,t I � ,�IIII���' --'� i1' '.' 1 ,�6;..,c�/-! ?r.�•,I� 1�s�,
I I I A
� �lu►v�z,�oikinr�n�a_v_��sv�uJ ���I _.� 1 ��r��!� �'�� �i� ���=�►��,
ZONE 2- ALLOWABLE - 609
Egli
-- --
I
• 1 I , A I
Elm�_rt.�.... r ■ r
rI - ■ •11
• • I A �\ �� i // Yli'11i"` ®mow
Fly
I ALLOWABLE SQFT � iiNHN. F'J
Arm
y��g:��, ,� � �� ' ir■ II II111sy'? I �jV I IMPACT I RI .
ZONE 2- ALLOWABLE - 492 SOFT
\
,n
y
/ see sheet C-3
E PROPOSED 4'HX7'W SECONDARY I ± ` •:.�' / / --�-� i /
PRECAST CONCRETE CULVERT 136 LF \�� l\h J TOTAL NETLANDS ON -SIX. 2.49 ACRES
` TOTAL NETLANDS IMPACTED ON -SITE: 0.00 ACRES
PROPOSED 7'HX7'W PRIMARY PRECAST TOTAL LINEAR FEET OF STREAM ON -SITE• 3,633 LF
CONCRETE CULVERT 136 LF TOTAL LINEAR FEET OF STREAM IMPACTED ON -SITE: 647 LF
1 TOTAL SQUARE FEET OF STREAM IMPACTED ON-SITE7,550 SF
TOTAL ZONE 1 ON -SITE: 19,202 SF
ZONE - 2,619 SOFT TOTAL ZONE 2 ON-SITE:35,476 SF
IMPERVIOUS AREA FOR PROPOSED PRO,.IECT.� 19.92 ACRES
• .1-ALLOWABLE
GRAPHIC SCALE
IN o IN THIS PROPERTY IS LOCATED ZONE %" AREAS DETERMINED TO BE OUTSIDE THE 0.2%
ANNUAL CHANCE FLOOD PLAIN AS SHOW ON FIRM PANELS 0824 & 0834, MAP
NUMBERS 37200824OW AND 3720083400K WITH AN EFFECTIVE DATE OF OCTOBER
to FMT 19, 2018.
t imh - 150 tL
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919 560 2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I Electrical/Plumbing Engineer
PDC Engineers
3101 Poplarvood Court, Suite 320
Raleigh, NC 27604
919790 s989
Civil Engineer 8 Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and Envelope Design
Rick Nuhn Engineering
1913 Thayer Circle
Greensboro, NC 27407
336-855-1182
Food Design
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
91954s 0288
SEAL I DATE 12/09/2020
PRELIMINARY -
NOT FOR CONSTRUCTION
RAT 10
PROJECTNO. 02000.000
SHEET TITLE
C-2
OVERALL PROPOSED
CONDITIONS PLAN
SHEETNUMBER

I cl I I I I o I I/ PERMANENT OUTLET PROTECTION
I I I I PRIMARY CULVERT
CLASS B STONIVi
RIP RAP TO BE BURIED AT GRADE
1 I
l ZONE 2- ALLOWABLE WITH ZONE 1- ALLOWABLE WITH
I j i / MITIGATION - 7,119 SQFT MITIGATION - 14,928 SOFT
LIMITS OF DISTURBAN
I
/.
PERMANENT STREAM
IMPACT 309 LF
ZONE 2- ALLOWABLE - 492 SOFT
IMPACT TABLE
J PERMANENT OUTLET PROTECTION
/J SECONDARY CULVERT
26148'W146'W2x22•TFI l l l I ✓ l
CLASS
STONE RAP 1D E RI BURIED AT GRADE
co
/ Cli / ZONE 1- ALLOWABLE UPON I I
AUTHORIZATION - 5,575 SQFT
/ 1
ZONE 2- ALLOWABLE - 3,193 SOFT
1
i
i
CULVERT 11
� 7H' X 7W PRECAST CONCRETE BOX CULVERT 136' LF
'/, L'l� 4H' X 7W' PRECAST CONCRETE BOX CULVERT 136' LF
/
PERMANENT STREAM ` 7-1 V° /
I IMPACT-187' LF
ZONE 1- ALLOWABLE - 2,619 SQFT
TEMPORARY
IMPACT, 8 OFFER
I
LF
I STREAM CENTERLINE I I I I I I
I I I I \ I LIMITS OF DISTURBANCE I I I
TOP OF STREAM BANKi I i 11 I I I I I I I
IMPACT AREA #1
Impact
Location
Impact
Feature
Impact
Type
Impact
Purpose
Impact
Amount
Permanent Loss
Impact Amount
Project
Impact (sq ft)
Project
Impact (acres)
Impact Areal
Stream
Existing
Culvert
31 LF
0LF
0
0
Impact Area 1
Stream
Permanent
Culvert
187 LF
187 LF
1,109
0.025
Impact Area 1
Stream
Permanent
Fill
309 LF
309 LF
3,036
0.069
Impact Area 1
Stream
Permanent
Rip Rap
32 LF
0
527
0.012
Impact Areal
I Stream
I Temporary
1 Coffer Dam
1 8LF
1 0
1 0
1 0
Totals:
1 536 LF
1 496 LF
1 4,672 SF
1 0.11 AC
IMPACT LEGEND
TYPE
IMPACT
DELINEATION
WETLAND
WWWWWWWW
W W W W
W W
COFFER DAM
RIP RAP FILL
PROPOSED CULVERT
EXISTING CULVERT
ZONE 1 ALLOWABLE
ZONE 2 ALLOWABLE
ZONE 1 ALLOWABLE
UPON AUTHORIZATION
ZONE 1 ALLOWABLE
K17H M177GA77ON UPON
AUTHORIZATION
'
ZONE 2 ALLOWABLE
WITH MITIGATION UPON
AUTHORIZATION
STREAM IMPACT
17 V V 17
NEUSE RIVER BUFFER AND STREAM IMPACTS - AREA 1
BUFFER IMPACTS
ZONE 1
ZONE 2
CROOKED CREEK
SQ FT
SQ FT
ALLOWABLE
2,619
3,685
ALLOWABLE UPON AUTHORIZATION
5,575
0
ALLOWABLE WITH MITIGATION UPON AUTHORIZATION
14,928
7,119
TOTAL
23,122
10,804
GRAPHIC SCALE
20 40 80
it:107
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821_0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I Electri--/Plumbing Engineer
PDC Engineers
3101 Poplarwood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and Envelope Desion
Rick Nuhn Engineering
1913 Thayer Circle
Greensboro, NC 27407
336-855-1182
Food Desion
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
PRELIMINARY -
NOT FOR CONSTRUCTION
aSs noE
PROJECTNO. 02000.000
SHEET TITLE
C-3
DETAIL PROPOSED
CONDITIONS PLAN
( IN FEET )
1 inch = 40 ft.
I SHEETNUMBER

/ RIP RAP OUTLET PROTECTION = 22 LF
RIP RAP TO BE BURIED AT GRADE / \
ZONE 2- ALLOWABLE 698 SQFT
ZONE 1- ALLOWABLE WITH
MITIGATION - 936 SQFT I
IMPACT AREA #2
IMPACT TABLE
RIP RAP OUTLET PROTECTION - 21 LF
\ \ / RIP RAP TO BE BURIED AT GRADE /
\
=// ZONE 2- ALLOWABLE 631 SOFT
ZOOWA
MTIGATION L - 906 SOFT
IMPACT AREA #3
NEUSE RIVER BUFFER AND STREAM IMPACTS - AREA 2,3 & 4
BUFFER IMPACTS
ZONE 1
ZONE 2
CROOKED CREEK
SQ FT
SQ FT
ALLOWABLE
0
1,938
ALLOWABLE UPON AUTHORIZATION
0
0
ALLOWABLE WITH MITIGATION UPON AUTHORIZATION
2,695
0
TOTAL
2,695
1,938
40
RIP RAP OUTLET PROTECTION = 21 LF
/ RIP RAP TO BE BURIED AT GRADE
7
C
ZONE 2 - ALLOWABLE - 609
ZONE 1- ALLOWABLE WITH
�\
MITIGATION - 853 SOFT
1
IMPACT AREA #4
IMPACT LEGEND
TYPE
IMPACT
DELINEATION
WETLAND
W W W W
y W W W
W W W W
COFFER DAM
RIP RAP FILL
vim
PROPOSED CULVERT
EXISTING CULVERT
ZONE 1- ALLOWABLE
WITH MITIGATION
ZONE 2-ALLOWABLE
GRAPHIC SCALE
0 20 40 80
( IN FEET )
1 inch = 40 ft.
160
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
Owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I Electrical/Plumbing Engineer
PDC Engineers
3101 Poplarwood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, INC 27518
919-319-6716
Roof and Envelope Design
Rick Nunn Engineering
1913 Thayer Circle
Greensboro, INC 27407
336-855-1182
Food Desiqn
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
SEAL I DATE 12/09/2020
PRELIMINARY -
NOT FOR CONSTRUCTION
bR r'_
PROJECTNO. 02000.000
SHEET TITLE
C-4
DETAIL PROPOSED
CONDITIONS PLAN
I SHEETNUMBER

5
/
/111111 11 WIN
/
4ZONE 1- ALLOWABLE - 847 SOFT
ZONE 2- ALLOWABLE - 672 SQFT
LIMITS OF DISTURBANCE
SS /
RETAINING WALL 8
,
PERMANENT OUTLET
PR07EC71ON
STW•TNLASON
RIP RAP TO BE BURIED AT GRADE
ZONE 1- ALLOWABLE - 3,014 SQFT
/r ZONE 2- ALLOWABLE - 1,736 SOFT
Z.Wi— 1"
' ' /`�)/ PERMANENT STREAM IMPACT 67 LF
/ , 8.5 HX8'W PRECAST CONCRETE BOX
CULVERT 63 LF
/ I LIMITS OF DISTUR ANCE
If ZONE 1- ALLOWABLE = 3,778 SOFT Ui / TEMPORARY
ZONE 2- ALLOWABLE 2,408 SQFT ' / IMPACT, COFFER
/ / DAM = 8 LF
STREAM
/
TOP OF STREAM BANK
IMPACT AREA #5
IMPACT TABLE
Impact
Location
Impact
Feature
Impact
Type
Impact
Purpose
Impact
Amount
Permanent Loss
Impact Amount
Project
Impact (sq ft)
Project
Impact (acres)
Impact Area 5
Stream
Permanent
Culvert
67 LF
67 LF
1,501
0.035
Impact Area 5
Stream
Permanent
Rip Rap
36 LF
0
936
0.021
Impact Area 5
Stream
Temporary
Coffer Dam
8 LF
0
0
0
Totals:
111 LF
67 LF
2,437 SF
0.056 AC
/
I/ /
/
/
/
IMPACT LEGEND
TYPE
IMPACT
DELINEATION
WETLAND
yWWWWWWWWW
W W W W
N W W W W
COFFER DAM
RIP RAP FILL
PROPOSED CULVERT
EXISTING CULVERT
ZONE 1 ALLOWABLE
ZONE 2 ALLOWABLE
ZONE 1 ALLOWABLE
UPON AUTHORIZATION
ZONE 1 ALLOWABLE
WITH MITIGATION UPON
AUTHORIZATION
'
ZONE 2 ALLOWABLE
WITH MITIGATION UPON
AUTHORIZATION
STREAM IMPACT
0 0 17 0
NEUSE RIVER BUFFER AND STREAM IMPACTS - AREA 5
BUFFER IMPACTS
ZONE 1
ZONE 2
CROOKED CREEK
SQ FT
SQ FT
ALLOWABLE
7,639
4,818
ALLOWABLE UPON AUTHORIZATION
0
0
ALLOWABLE WITH MITIGATION UPON AUTHORIZATION
0
0
TOTAL
7,639
4,818
GRAPHIC SCALE
40 O 20 40 80
160
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
ner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical L Electrical/Plumbing Engineer
PDC Engineers
3101 Poplari Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Landsca�Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and EnveloneRoof and Envelope Desion
Rick Nuhn Engineering
1913 Thayer Circle
Greensboro, NC 27407
336-855-1182
Food Desiqn
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
SEAL I DATE 12/09/2020
PRELIMINARY -
NOT FOR CONSTRUCTION
SHEET ISSUE
2 ]RATin
PROJECTNO. 02000.000
SHEET TITLE
C-5
DETAIL PROPOSED
CONDITIONS PLAN
( IN FEET )
1 inch = 40 ft.
SHEET NUMBER

ZONE 2- ALLOWABLE - 742 SQFT
/
ZONE 1- ALLOWABLE - 282 SOFT
IMPACT AREA #6
RIP RAP OUTLET PR07EC71ON = 21 LF / /PIN"24
/ RIP RAP TO BE BURIED AT GRADE
IZONE 2- ALLOWABLE - 670 SOFT
I ZONE 1- ALLOWABLE WITH
MITIGATION - 1024 SOFT
IMPACT AREA #8
IMPACT TABLE
2 I
RIP RAP OUTLET PR07EC71ON = 21 LF I //
RIP RAP TO BE BURIED AT GRADEPROM
II 1
I � I I ' PAR NENT
I I%J SS
II it ZONE 1- ALLOWABLE WI7H �6, /
M171GA710N - 943 SQFT �� \
ZONE 2- ALLOWABLE - 655 SOFT
IMPACT AREA #7
l \ � RIP RAP OUTLET PR07EC71ON = 21 LF
RIP RAP TO BE BURIED AT GRADE
lZONE 1-ALLOWABLE WITH
M171GA71ON - 914 SQFT
ZONE 2- ALLOWABLE - 615 SQFT
IIV 41
1\ I 1 c IL IV 4,�
WETLAND
IMPACT AREA #9
NEUSE RIVER BUFFER AND STREAM IMPACTS - AREA 6,7,8 & 9
BUFFER IMPACTS
ZONE 1
ZONE 2
CROOKED CREEK
SQ FT
SQ FT
ALLOWABLE
282
2,682
ALLOWABLE UPON AUTHORIZATION
0
0
ALLOWABLE WITH MITIGATION UPON AUTHORIZATION
2,881
0
TOTAL
3,163
2,682
40 0
IMPACT LEGEND
TYPE
DE LINEATION
WETLAND
W W W W
WWWWWWWW�
W W W
COFFER DAM
RIP RAP FILL
PROPOSED CULVERT
EXISTING CULVERT
— — — —
ZONE 1 ALLOWABLE.
ZONE 2 ALLOWABLE
GRAPHIC SCALE
20 40 SO
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
Owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I ElectricallPlumb Engineer
PDC Engineers
3101 Poplarwood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and Envelope Design
Rick Nuhn Engineering
1913 Thayer Circle
Greensboro, NC 27407
336-855-1182
Food Design
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
SEAL I DATE 12/09/2020
PRELIMINARY -
NOT FOR CONSTRUCTION
NN' RATIO I
PROJECTNO. 02000.000
SHEET TITLE
C-6
DETAIL PROPOSED
CONDITIONS PLAN
( IN FEET )
1 inch = 40 ft.
SHEETNUMBER

IMPACT AREA #1
35
FG ELEV. 349.00
35GRADE
34 TEMPORARY
COFFER )DAM
34
EXISTING
33 INVERT IN. 32 00'
136 LF 1.5HX7.5'W PRIMARY PRECAST
CONCRETE BOX CULVERT @ 2.21% SLOPE
32 INVER
10+00 11 +00
M.3 COFFER DAM
I I I I I
I I STREAM CENTERLINE % j l i 80
-N TOP OF STREAM BANK /
CUL VCR T 1 PLAN
350
345
HEAD 340
WALL
335
OUTLET PROTECTION SHALL BE
INSTALLED SUCH THAT RIPRAP IS
FLUSH WITH EXISTING GRADE. SEE
DETAIL.
CLASS B RIPRAP DISSIPATOR
32'Lx24'W1X21W2x22"TH
OUTJ 329.00' 325
12+00 13+00
z
GRAPHIC SCALE
0 40 80 160 320
35
35 FG ELEV: 349.00' FINISH
34
34
33 EXISTING
GRADE
33 INVERT IN:3 5.50
136 LF 4'HX5'W SECONDARY PRECAST
BOX CULVERT @ 1.10% SLOPE
32
10+00 11 +00
CULVERT 1 PROFILE
( IN FEET )
1 inch = 80 ft.
HORIZONTAL: 1"=80'
VERTICAL: 1"= 8'
OUT.334.0
'
350
345
340
335
HEAD
HALL
'VERT
OUTLET PROTECTION SHALL BE
INSTALLED SUCH THAT RIPRAP IS
FLUSH WITH EXISTING GRADE. SEE
DETAIL.
CLASS B RIPRAP DISSIPATOR
26'Lx 18W 1 'X 16 W2X22"TH
325
13+00
12+00
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
Owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I Electrical/Plumbing Engineer
PDC Engineers
3101 Poplarwood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and Envelope Design
Rick Nuhn Engineering
1913 ThayerCircle
Greensboro, NC 27407
336-855-1182
Food Design
FooDesign Associates
615 Sou[h Coll ege Street, 9th Floor
919-546-0288
PRELIMINARY -
NOT FOR CONSTRUCTION
SHEETISSUE
IINWRN. ATIO
PROJECTNO. 02000.000
SHEET TITLE
C-7
CULVERT PROFILE
SHEETNUMBER

IMPACT AREA #2
35F
3�
34
34
3�
3�
3z'
32
CULVERT 2 PLAN
FG ELEV.-
350.00'
FINISH
GRADE
350
RETAI
ING
WALL
345
63 LF 8.5'HX8'W PRECAST
CONCRETE BOX CULVERT @
294% SLOPE
340
TEMPORI
RY
COFFER
AM
XL
335
330
OUTLET PROTECTION SHALL
BE INSTALLED SUCH THAT
RIPRAP IS FLUSH WITH
EXISTING GRADE. SEE DETAIL.
CLASS B RIPRAP DISSIPATOR
36'Lx24'WIX28W2x22"TH
EXISTING
GRADE
INVERT IN:
24.80
INVERT
OUL 324.40'
z ,)n
10+00 11 +00 12+00 12+50
CULVERT 2 PROCILE
i , , /"""
X
80 0
Z11
GRAPHIC SCALE
40 80 160
( IN FEET )
1 inch = 80 ft.
HORIZONTAL: 1"=80'
VERTICAL: 1"-8'
320
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
Owner _
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical / Electrical/Plumbing Engineer
PDC Engineers
3101 Poplanvood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
Roof and Envelope Design
Rick Nuhn Engineering
1913 Thayer Circle
Greensboro, NC 27407
336-855-1182
Food Design
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
SEAL I DATE 12/09/2020
PRELIMINARY
NOT FOR CONSTRUCTION
SHEETISSUE
*RATIO
PROJECT NO. 02000.000
SHEET TITLE
C-8
CULVERT PROFILE
SHEETNUMBER

L
TYPE STONE
A A
00 00 000000 0° oo�o ° 0°0
o 0 0 00 0 0° o 0
° 0 0° o o
O O O o o O o - o op
0 D O O o O O O OOOOOo00000Oo°0�'.
°0 Oo 00 o O O O 0 000 00 00000�000� �C)
OOOOO � 0 0 0 oO0 C 0 0 000 O° o°po0 o Uo0 00
0 0 0 0 VOOOOo0000O0o 00
°00 0 0 o O° 00°0o0°°
PLAN
(OUTLET TO FLAT AREA WITH NO WELL DEFINED CHANNEL)
L
o O
Oo
B
O
J
�1
-'z
000°0000 Op O
O O
�0 0 Oo000 o O O o
O o0 °p O o
o �bo ° o po
zz�
o o
COo°o0°Oo °O o0° °o
= U
0 0 O °0 °0OOo
O��
�O
0
0 °00 Oop 0o0 0
O�
O
°°Op ° C) o° 0 0 0 0 00
O O p O o 0 0 0
0
00 00 0 000
ooDo p000
PLAN
(OUTLET TO WELL DEFINED CHANNEL)
MAINTENANCE NOTES:
1. RIP RAP OUTLET STRUCTURES TO BE INSPECTED WEEKLY AND AFTER
EVERY RAINFALL EVENT
2. REPAIR DISLODGED STONES TO DESIGN DIMENSIONS IMMEDIATELY
3. IF MORE SUBSTANTIAL DAMAGE OCCURS, NOTIFY ENGINEER TO
DETERMINE A REPAIR SOLUTION.
N 0 TES:
SECTION AA
00000V00
°o°O°O o Uo
00000�00
0 0
�0000v00<
SECTION B-B
(AMOCO 2006
OR EQUIVALENT)
FILTER BLANKET
TYPE STONE
f—
FILTER BLANKET
(AMOCO 2006
OR EQUIVALENT)
1. TOP OF RIP RAP AT DOWNSTREAM END OF APRON SHALL BE FLUSH WITH
NATURAL GRADE OF THE RECEIVING CHANNEL.
2. INSTALL OUTLET PROTECTION IMMEDIATELY AFTER INSTALLATION OF PIPE,
3. SEE GRADING PLAN FOR PERMANENT OUTLET PROTECTION DIMENSIONS. SEE
EROSION CONTROL PLAN FOR TEMPORARY OUTLET PROTECTION DIMENSIONS.
RIPRAP OUTLET PROTECTION DETAIL
N. T S.
-1111110-
0 1
O
O O 1
O Ot
o SAND BAGS
00000
O 00000
8'
TEMPORARY COFFER DAM OETAIL
Northern High
School
Replacement
4622 & 4804 N.
Roxboro Street
Durham, NC 27704
Owner
Durham Public Schools
2011 Hamlin Road
Durham, NC 27704
919-560-2000
Architect
RATIO
227 Fayetteville Street, Suite 301
Raleigh, North Carolina 27601
919-821-0805
Structural Engineer
LHC Structural Engineers
5430 Wade Park Blvd, Suite 400
Raleigh, NC 27607
919-832-5587
Mechanical I ElectricallPlumbing Engineer
PDC Engineers
3101 Poplamood Court, Suite 320
Raleigh, NC 27604
919-790-9989
Civil Engineer & Landscape Architect
CLH Design, PA
400 Regency Forest Drive, Suite 120
Cary, NC 27518
919-319-6716
pppn RLic u Engineering
13 ha rcircle
re sb • NC 27407
336-855-1182
Food Design
FooDesign Associates
615 South College Street, 9th Floor
Charlotte, NC 28202
704-545-6151
Theatre Consultant
Theatre Consultants Collaborative
519 Polk Street
Raleigh, NC 27604
919-546-0288
PRELIMINARY -
NOT FOR CONSTRUCTION
QG RAT I O
PROJECTNO. 02000.002
SHEET TITLE
C-9
DETAILS
SHEETNUMBER