20200637 Ver 1_401 Application_20200513

DWR
mrlslon of Water Resources
Pre -Construction Notification (PCN) Form
April 11, 2020 Ver 3.1
Initial Review
Has this project met the requirements for acceptance in to the review process?*
r Yes
r No
Is this project a public transportation project?*
C Yes r No
Change only if needed.
BIMS # Assigned
20200637
Is a payment required for this project?*
r No payment required
r Fee received
r Fee needed - send electronic notification
Select Project Reviewer*
Robert Tankard:eads\rbtankard
Information for Initial Review
1a. Name of project:
COURTESY COPY - Havelock High School Stormovater Wetland
1a. Who is the Primary Contact?*
Stacie Friebel
1b. Primary Contact Email:*
[e-mail]
Date Submitted
5/13/2020
Nearest Body of Water
Shop Branch
Basin
Neuse
Water Classification
SC,Sw,NSW
Site Coordinates
Latitude:
34.8806662
A. Processing Information
County (or Counties) where the project is located:
Craven
Is this a NCDMS Project
r Yes r No
Longitude:
-76.8957279
Is this project a public transportation project?*
r Yes r No
1a. Type(s) of approval sought from the Corps:
W Section 404 Permit (wetlands, streams and waters, Clean Water Act)
r Section 10 Permit (navigable waters, tidal waters, Rivers and Harbors Act)
Version#*
1
Reviewing Office*
Washington Regional Office - [phone]
1c. Primary Contact Phone:*
[phone]
V
1b. What type(s) of permit(s) do you wish to seek authorization?

W Nationwide Permit (NWP)
r Regional General Permit (RGP)
r Standard (IP)
1c. Has the NWP or GP number been verified by the Corps?
r Yes r No
Nationwide Permit (NWP) Number:
NWP Numbers (for multiple NWPS):
1d. Type(s) of approval sought from the DWR:
W 401 Water Quality Certification - Regular
r Non-404 Jurisdictional General Permit
r Individual Permit
18 - Minor Discharges
le. Is this notification solely for the record because written approval is not required?
For the record only for DWR 401 Certification:
For the record only for Corps Permit:
F- 401 Water Quality Certification - E)press
r Riparian Buffer Authorization
1f. Is this an after -the -fact permit application?*
r Yes r No
1g. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts?
r Yes r No
1g. Is payment into a mitigation bank or in -lieu fee program proposed for mitigation of impacts?
r Yes r No
Acceptance Letter Attachment
1h. Is the project located in any of NC's twenty coastal counties?
r Yes r No
1i. Is the project located within a NC DCM Area of Environmental Concern (AEC)?
r Yes r No
1j. Is the project located in a designated trout watershed?
C Yes r No
F. Applicant Information
1d. Who is applying for the permit?
fJ Owner r Applicant (other than owner)
le. Is there an Agent/Consultant for this project?*
r Yes r No
2. Owner Information
2a. Name(s) on recorded deed:
CRAVEN COUNTY BOARD OF EDUCATION
2b. Deed book and page no.:
0733 0048
2c. Responsible party:
Stacie Friebel, Principal, Havelock High School
2d.Address
Street Address
101 Webb Blvd
Address Line 2
city
Havelock
Postal / Zip Code
28532
2e. Telephone Number:
[phone]
2g. Email Address:*
[e-mail]
r Unknown
State / Rovince / Region
NC
Country
USA
2f. Fax Number:
r Yes r No
r Yes r No
u

C. Project Information and Prior Project History C")
1. Project Information
1b. Subdivision name:
(if appropriate)
1c. Nearest municipality/ town:
Havelock
P ject Identification
2a. Property Identification Number:
Parcel ID 6-220
2c. Project Address
Street Address
101 Webb Blvd
Address Line 2
City
Havelock
Pbstal / Zip Code
28532
3. Surface Waters
3a. Name of the nearest body of water to proposed project:*
Shop Branch
3b. Water Resources Classification of nearest receiving water:*
SC;Sw,NSW
3c. What river basins) is your project located in?*
Neuse
3d. Please provide the 12-digit HUC in which the project is located.
030202040504
4. Project Description and History
2b. Property size:
52.75
State / Province / Fkgion
NC
Country
USA
4a. Describe the existing conditions on the site and the general land use in the vicinity of the project at the time of this application:*
The existing stormwater drainage ditch is located between a parking lot and athletic field along Webb Blvd on the Havelock High School property. The ditch is trapezoidal in shape with a
very narrow bottom width (2-3 feet), steep side slopes and is stabilized with maintained turf grass (e.g. mowing and weed eating).
4b. Have Corps permits or DWR certifications been obtained for this project (including all prior phases) in the past?*
r Yes r No r^ Unknown
4d. Attach an 8 1/2 X 11 excerpt from the most recent version of the USGS topographic map indicating the location of the project site. (for DWR)
Havelock_topo.pdf
272.61 KB
4e. Attach an 8 1/2 X 11 excerpt from the most recent version of the published County NRCS Soil Survey map depicting the project site. (for DWR)
Havelock soil map.pdf 616.46KB
4f. List the total estimated acreage of all existing wetlands on the property:
0
4g. List the total estimated linear feet of all existing streams on the property:
520 feet
4h. Explain the purpose of the proposed project:*
The existing ditch will be widened and check dams installed to create a stormwater wetland feature that will treat runoff from the adjacent parking areas and playing fields. The existing
ditch has a bottom width of 2-3 feet. The bottom width Will be increased to 5-7 feet to establish more wetland surface area. Four check dams will be installed in the wetland bottom to
maintain a water depth of 6-12 inches in order to support an herbaceous wetland plant community. The ditch bottom will be planted with wetland plant plugs including Soft Rush (Juncus
effusus), Arrow arum (Peltandra virginica), Pickerel weed (Pontederia cordata) and Green Bulrush (Scirpus atrovirens).
41. Describe the overall project in detail, including indirect impacts and the type of equipment to be used:*
Using grant funding, Sound Rivers, Inc., NC Sea Grant and NCSU Department of Biological & Agricultural Engineering are developing demonstration projects for stromwater
management at schools throughout the Neuse and Tar River basin. The projects are intended to improve water quality by removing sediment, bacteria and nutrients. By widening the
ditch bottom, adding check dams and incorporating herbaceous wetland plants, the water storage and retention time will be increased. Specifically, the wetland will store and treat the
runoff that is generated from a one inch rainfall event. A small excavator will be used to widen the ditch and install the stone check dams. All cut material Will be removed and hauled
away from the site.
4j. Please upload project drawings for the proposed project.
HHS Wetland.pdf
3.08MB
5. Jurisdictional Determinations

5a. Have the wetlands or streams been delineated on the property or proposed impact areas?*
r Yes r No
r Unknown
Comments:
Desktop delineation by the USACE
5b. If the Corps made a jurisdictional determination, what type of determination was made?*
r Preliminary r Approved r Not Verified r Unknown f N/A
Corps AID Number:
5c. If 5a is yes, who delineated the jurisdictional areas?
Name (if known): Emily Thompson
Agency/Consultant Company: USACE
Other:
5d. List the dates of the Corp jurisdiction determination or State determination if a determination was made bythe Corps or DWR
March 24, 2020 the delineation was provided based on the limits of grading for the proposed project.
5d1. Jurisdictional determination upload
6. Future Project Plans
6a. Is this a phased project?*
r Yes r No
Are any other NWP(s), regional general permit(s), or individual permits(s) used, or intended to be used, to authorize any part of the proposed project or related activity?
NIA
[Proposed Impacts Inventory
1. Impacts Summary
la. Where are the impacts associated with your project? (check all that apply):
r Wetlands r Streams -tributaries
rO Open Waters r Pond Construction
4.Open Water Impacts
r Buffers
4a. Site # _114al. Impact Reason 4b. Impact type 4c. Name of wat,rbody 4d. Activity type 4e. Waterbodytype 4f. Impact area
Stormwater
LCreatt.eStormwater
ent Wetland
P
UT to Shop Branch
Fill
Ditch0.01wetland
4g. Total temporary open water Impacts:
0.00
4g. Total open water impacts:
0.01
4g. Total permanent open water impacts:
0.01
4h. Comments:
Four rock check dams Will be placed in the eAsting ditch to increase water depths by 6 inches to 1 foot in order to support an herbaceous wetland
plant community. The check dams constitute a fill of the wasting ditch totaling 6 cubic yards in volume. The footprint of each check dam within the
eAsting ditch is 67 square feet so the total footprint of all four check dams is 268 square feet or 0.006 acres.
E. Impact Justification and Mitigation v
1. Avoidance and Minimization
la. Specifically describe measures taken to avoid or minimize the proposed impacts in designing the project:
This is a stormwater retrofit project. An eAsting poor quality ditch will be converted to a stormwater wetland that Will provide treatment of the runoff
from an eAsting adjacent parking lot that will result from a one inch storm.
1b. Specifically describe measures taken to avoid or minimize the proposed impacts through construction techniques:
Appropriate grading equipment will be used in order to complete the project in a rapid time frame, thus minimizing disturbance through sediment and
erosion control. Measures will be taken to minimize any possible transport of sediment to downstream waters.
2. Compensatory Mitigation for Impacts to Waters of the U.S. or Waters of the State
2a. Does the project require Compensatory Mitigation for impacts to Waters of the U.S. or Waters of the State?
r' Yes r No

2b. If this project DOES NOT require Compensatory Mitigation, explain why:
The project is a stormwater treatment retrofit. There is no new development or impervious surface being added as part of this effort. The project is intended to enhance the
environmental quality of the ditch for the primary purpose of removing sediment, bacteria and nutrients from stormwater runoff. The existing ditch that is maintained in turf grass will be
converted into a linear stormwater wetland with herbaceous wetland plants.
F. Stormwater Management and Diffuse Flow Plan (required by DWR)
1. Diffuse Flow Plan
1a. Does the project include or is it adjacent to protected riparian buffers identified within one of the NC Riparian Buffer Protection Rules?
r Yes r No
If no, explain why:
The existing stormwater runoff is piped to the ditch. The drainage network will not be modified. Rather, the treatment capability of the ditch will be improved.
2. Stormwater Management Plan
2a. Is this a NCDOT project subject to compliance with NCDOT's Individual NPDES permit NCS000250?*
r Yes r No
2b. Does this project meet the requirements for low density projects as defined in 15A NCAC 02H .1003(2)?
r Yes r No
2c. Does this project have a stormwater management plan (SMP) reviewed and approved under a state stormwater program or state -approved local government stormwater
program?
r Yes r No
r N/A - project disturbs < 1 acre
3. Stormwater Requirements
3a. Select whether a completed stormwater management plan (SMP) is included for review and approval or if calculations are provided to document the project will not cause
degradation of downstream surface waters.*
r Stornrvvater Management r Antidegradation
Plan Calculations
3b. Stormwater Management Plan
3c. Antidegradation Calculations:
Comments:
The project will not result in newstromvrater runoff. Rather, the project is a stormwater retrofit intended to improve treatment of runoff from an existing stormwater source. Specifically,
runoff from an existing parking lot will be treated by the proposed wetland.
G. Supplementary Information
1. Environmental Documentation
1a. Does the project involve an expenditure of public (federal/state/local) funds or the use of public (federal/state) land?*
r Yes r No
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 (North Carolina)
Environmental Policy Act (NEPA/SEPA)? *
r Yes r No
Comments:*
The project is funded through an Environmental Enhancement Grant provided by the NC Department of Justice.
2. Violations (DWR Requirement)
2a. Is the site in violation of DWR Water Quality Certification Rules (15A NCAC 2H .0500), Isolated Wetland Rules (15A NCAC 2H .1300), or DWR Surface Water or Wetland Standards or
Riparian Buffer Rules (15A NCAC 2B .0200)? *
r Yes r No
3. Cumulative Impacts (DWR Requirement)
3a. Will this project result in additional development, which could impact nearby downstream water quality?*
r Yes r No
3b. If you answered "no," provide a short narrative description.
The proposed wetland enhancement project is located on an existing property ovmed by the Craven County School system as a high school. No future
development is anticipated as a result of adding stormwater treatment on this property.
4. Sewage Disposal (DWR Requirement)

4a. Is sewage disposal required by DWR forth is project?*
r Yes r Nor WA
5. Endangered Species and Designated Critical Habitat (Corps Requirement)
5a. Will this project occur in or near an area with federally protected species or habitat?*
r Yes r No
5b. Have you checked with the USFWS concerning Endangered Species Act impacts?*
r Yes r No
5d. Is another Federal agency involved?*
r Yes r No
5e. Is this a DOT project located within Division's 1-8?
r Yes r No
5f. Will you cut any trees in order to conduct the work in waters of the U.S.?
r Yes r No
5g. Does this project involve bridge maintenance or removal?
r Yes r No
5h. Does this project involve the construction/installation of a wind turbine(s)?'
r Yes r No
r Unknown
51. Does this project involve (1) blasting, and/or (2) other percussive activities that will be conducted by machines, such as jackhammers, mechanized pile drivers, etc.?
r Yes r No
5j. What data sources did you use to determine whether your site would impact Endangered Species or Designated Critical Habitat?
The existing stormwater ditch does not provide critical habitat or would not be suitable for use by the endangered or threatened species listed for
Craven County https:/Iwww.Ns.gov/raleigh/species/cntylist/craven.html and there are no occurrences of Critical Habitat for Threatened & Endangered
Species indicated by the USFWS GIS mapper https://fws.maps.arcgis.cont/home/vaebmap/viewer.html?webmap=9d8de5e265ad4fe09893cf75b8dbfb77
Consultation Documentation Upload
6. Essential Fish Habitat (Corps Requirement)
6a. Will this project occur in or near an area designated as an Essential Fish Habitat?*
r Yes r No
6b. What data sources did you use to determine whether your site would impact an Essential Fish Habitat?*
hftps://www.habitat.noaa.gov/application/efhniapper/indexhtml
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 status?*
r Yes r No
7b. What data sources did you use to determine whether your site would impact historic or archeological resources?*
NC Historic Preservation Office's HPOWEB 2.0
7c. Historic or Prehistoric Information Upload
8. Flood Zone Designation (Corps Requirement)
8a. Will this project occur in a FEMA-designated 100-year floodplain?*
r Yes r No
8c. What source(s) did you use to make the floodplain determination?*
msc.fema.gov - The high school is outside of the 100-year floodplain mapped for East Prong of Slocum Creek and Hancock Creek
Miscellaneous
Comments
Miscellaneous attachments not previously requested.
Signature
*
W By checking the box and signing below, I certify that:
u

• I have given true, accurate, and complete information on this form;
I agree that submission of this PCN form is a "transaction" subject to Chapter 66, Article 40 of the NC General Statutes (the "Uniform Electronic Transactions Act');
• I agree to conduct this transaction by electronic means pursuant to Chapter 66, Article 40 of the NC General Statutes (the "Uniform Electronic Transactions Act");
• I understand that an electronic signature has the same legal effect and can be enforced in the same way as a written signature; AND
• I intend to electronically sign and submit the PCN form.
Full Name:
Stacie Friebel
Signature
Date
5/13/2020

USGS The National Map: National Boundaries Dataset, 3DEP ElevationProgram, Geographic Names Information System, National HydrographyDataset, National Land Cover Database, National Structures Dataset, andNational Transportation Dataset; USGS Global Ecosystems; U.S. CensusBureau TIGER/Line data; USFS Road D ata; Natural Earth Data; U.S.Department of State H umanitarian Information Unit; and NOAA NationalCenters for Environmental Information, U.S. Coastal Relief Model. Datarefreshed February, 2020.
PROJECT LOCATION
0 1,000500 Feet¯
Havelock High School USGS Topo Map
Soil Map—Craven County, North Carolina
(Havelock High School)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/24/2020
Page 1 of 338610003861080386116038612403861320386140038614803861560386164038610003861080386116038612403861320386140038614803861560326650326730326810326890326970327050327130
326650 326730 326810 326890 326970 327050
34° 52' 56'' N 76° 53' 48'' W34° 52' 56'' N76° 53' 29'' W34° 52' 35'' N
76° 53' 48'' W34° 52' 35'' N
76° 53' 29'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 18N WGS84
0 150 300 600 900
Feet
0 45 90 180 270
Meters
Map Scale: 1:3,150 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Map Unit Polygons
Soil Map Unit Lines
Soil Map Unit Points
Special Point Features
Blowout
Borrow Pit
Clay Spot
Closed Depression
Gravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellaneous Water
Perennial Water
Rock Outcrop
Saline Spot
Sandy Spot
Severely Eroded Spot
Sinkhole
Slide or Slip
Sodic Spot
Spoil Area
Stony Spot
Very Stony Spot
Wet Spot
Other
Special Line Features
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Craven County, North Carolina
Survey Area Data: Version 22, Sep 16, 2019
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Dec 31, 2009—Oct
30, 2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Soil Map—Craven County, North Carolina
(Havelock High School)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/24/2020
Page 2 of 3
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
GuA Goldsboro-Urban land
complex, 0 to 2 percent
slopes
0.0 0.0%
Ra Rains fine sandy loam, 0 to 2
percent slopes, Atlantic
Coast Flatwoods
3.7 7.1%
Rc Rains-Urban land complex 44.6 85.9%
Tc Torhunta-Urban land complex 1.3 2.5%
To Torhunta fine sandy loam 2.3 4.5%
Totals for Area of Interest 51.9 100.0%
Soil Map—Craven County, North Carolina Havelock High School
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/24/2020
Page 3 of 3
SEWER FORCEMAIN LINE10' SEWER EASEMENTWATER-METER
DAMAGED-UTILITY
UTILITY-CLEANOUT
LIGHTPOLE
UTILITY-CLEANOUT
36IN RCP
36IN RCP
18IN RCP
TOWER18 CPP24 RCP24 RCP
CHAIN LINK FENCE18 CPP0+00 1+002+003+004+005
+
0
0
5+79GRADING LIMITSAREA = 9032 FT2ROCK CHECK DAMSTART PROJECTSTA. 0+48.12END PROJECTSTA. 5+32.0018IN RCP9495969798991001010+000+250+500+751+001+251+501+752+002+252+502+753+003+253+503+754+004+254+504+755+005+255+505+755+8518" CPP INV. = 97.36STA. 0+48.1318" CPP INV. = 96.49-??STA. 4+38DITCH ANGLE BEGINSSTA. 4+3018" CPP INV. = 96.49-??STA. 4+38SEWER FORCEMAIN LINESTA. 5+47STA. 5+3410'SEWEREASEMENT18" CPP INV. = 96.64STA. 0+27.1236" RCP INV. = 95.67STA. 5+80EXISTING LTOBEXISTING RTOBSTA = 2+28.8
ELEV = 97.57
STA = 3+44.8
ELEV = 97.32
STA = 4+18.9
ELEV = 97.07
STA = 5+26.6
ELEV = 96.820.10%0.22%0.34%0.23%PROPOSED GRADEEXISTING GRADEPERMANENT POOL ELEV.GRADING STARTSTA. 0+48.12ELEV. = 97.00END PROJECTSTA. 5+32ROCK CHECK DAMSEWER FORCEMAIN LINE10' SEWER EASEMENTGRADING LIMITSAREA = 9032 FT2START PROJECTSTA. 0+48.12WETLAND HERBACEOUS PLUGS 1 FT SPACINGLIMITED TO CHANNEL BOTTOM WIDTHAREA = 3392 FT2RIPARIAN SEED MIX AND MATTINGON GRADED SLOPESAREA = 4655 FT2END PROJECTSTA. 5+32.00APPROVED :
CHECK :
DRAWN :
DESIGN :
PROJECT
NAME :
SCALE :
DATE :
PROJECT #
CHJ
CHJ, BAD
AS NOTEDCHJ
HHS - WETLAND RETROFIT
DESIGN PLANS
HAVELOCK, NC - CRAVEN CO.
101 WEBB BLVD
HAVELOCK HIGHSCHOOL
PLAN - PROFILE 1.1
PLAN TYPE:SHEET NUMBER
REVISION #
FEBRUARY 1, 2020
5-82485
ORIGINAL Feet02040Feet02040
ElevationCross Section Sta. 2+29969798991000+000+050+100+150+200+250+30ElevationCross Section Sta. 3+45969798991000+000+050+100+150+200+250+30ElevationCross Section Sta. 4+19969798991000+000+050+100+150+200+250+30ElevationCross Section Sta. 5+2795969798991000+000+050+100+150+200+250+30EXISTING GRADEEXISTING GRADEEXISTING GRADEPROPOSED GRADEPROPOSED GRADEPROPOSED GRADE3:13:13:13:1EXISTING GRADEPROPOSED GRADEAPPROVED :
CHECK :
DRAWN :
DESIGN :
PROJECT
NAME :
SCALE :
DATE :
PROJECT #
CHJ
CHJ, BAD
AS NOTEDCHJ
HHS - WETLAND RETROFIT
DESIGN PLANS
HAVELOCK, NC - CRAVEN CO.
101 WEBB BLVD
HAVELOCK HIGHSCHOOL
CROSS-SECTIONS 2.1
PLAN TYPE:SHEET NUMBER
REVISION #
FEBRUARY 1, 2020
5-82485
ORIGINAL
2:12:11.5'MIN.4.5'0.75' MAX ATCENTERFLOWSTRUCTURAL BASE STONE NC DOT CLASS B12" OF FILTER STONEASTM #57DITCH BED2/3 BOTTOMWIDTH0.75'1.5'1.5'FILTER FABRICDITCH BEDFILTER FABRICA'AB'BTOP OF BANKTOE OF SLOPESTRUCTURAL BASE STONE NC DOT CLASS B12" OF FILTER STONEASTM #572/3 BOTTOMWIDTHFLOWDETAILED PLANNOT TO SCALEROCK CHECK DAM1.5'1.5'SECTION A - A'ROCK CHECK DAMNOT TO SCALESECTION B - B'NOT TO SCALEROCK CHECK DAMEXISTING TOP OF BANK1.THE PROPOSED STRUCTURE IS DESIGNED TO CONTROL GRADE, PROVIDE ENERGY DISSIPATIONAND STORAGE FOR UPLAND AND UPSTREAM SUPPLIED SEDIMENTS. THE STRUCTURE IS COMPOSEDOF A NCDOT CLASS B STRUCTURAL BASE STONE AND ASTM #57 FILTER STONE. THE STRUCTURALBASE STONE WILL BE INSTALLED ON THE DOWN SECTION OF THE STRUCTURE TO CREATE A STONEWEIR THAT IS 2/3 THE WIDTH OF THE CHANNEL BOTTOM. STRUCTURAL STONE WILL EXTENDUPWARD TOWARDS THE DITCH BANK FROM THE WEIR TO DIRECT FLOW TOWARDS THE CENTER OFTHE CHANNEL. THE FILTER STONE WILL BE INSTALLED ON THE UPSTREAM SECTION OF THESTRUCTURE TO THE ELEVATION OF THE STRUCTURAL STONE WEIR.2.THE STRUCTURAL BASE STONE SHALL BE GRADED UP FROM THE DITCH BED WITH A 2:1 (H:V) SLOPETO CREATE A STONE WEIR THAT HAS A DEPTH OF 0.75 FT AT THE CENTER OF THE DAM.STRUCTURAL BASE STONE SHALL BE CONSTRUCTED OF NC DOT CLASS B.3.THE LAYER OF FILTER STONE SHALL BE 1.0 FT THICK AND CONSIST OF ASTM #57 THAT IS GRADEDUP FROM THE DITCH BED TO THE ELEVATION OF THE STONE WEIR WITH A 2:1 (H:V) SLOPE.4.STRUCTURAL BASE STONE SHALL EXTEND UP TOWARDS THE DITCH BANK FROM THE WEIREXTENTS SO THAT THE WEIR HAS A WIDTH THAT IS 2/3 THE WIDTH OF THE CHANNEL BOTTOM, AMINIMUM OF 1.5 FT OF BASE STONE SHALL EXTEND OUT FROM THE DITCH BANK AT AN ELEVATIONTHAT IS 0.75 FT ABOVE THE STONE WEIR. THIS WILL AVOID WASHOUT FROM OVERFLOW AROUNDTHE DAM.5.THE ROCK CHECK DAM STRUCTURES SHALL BE INSTALLED TO THE ELEVATIONS SHOWN IN THEPLANS AND PROFILE. DIMENSIONS, SLOPES AND ELEVATIONS OF THE STRUCTURES DESCRIBED INTHE DETAIL MAY BE ADJUSTED BY THE ENGINEER TO FIT CONDITIONS ONSITE.ROCK CHECK DAMNOTESAPPROVED :
CHECK :
DRAWN :
DESIGN :
PROJECT
NAME :
SCALE :
DATE :
PROJECT #
CHJ
CHJ, BAD
AS NOTEDCHJ
HHS - WETLAND RETROFIT
DESIGN PLANS
HAVELOCK, NC - CRAVEN CO.
101 WEBB BLVD
HAVELOCK HIGHSCHOOL
DETAILS 3.1
PLAN TYPE:SHEET NUMBER
REVISION #
FEBRUARY 1, 2020
5-82485
ORIGINAL