SW7101202_HISTORICAL FILE_20210505

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW �lOf �Qa
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE�QS
YYYYM M D D

LJLA�L0
ROY COOPER
Governor
DIONNE DELLI-GATTI
Secretary
BRIAN WRENN
Director
NORTH CAROLINA
Environmental Quality
May 5, 2021
Mr. Charles E. Schulz, Deputy Facilities Officer
MCAS Cherry Point
PSC Box 8006
Cherry Point, NC 28533
Subject: Stormwater Permit Renewal
Stormwater Management Permit SW7101202
MCAS Cherry Point— P-141 EMS Fire Vehicle Facility
Craven County
Dear Mr. Schulz:
A Division of Energy, Mineral, and Land Resources file review has determined that
Stormwater Permit SW7101202 for a stormwater treatment system consisting of five
bioretention basins serving P-141 EMS Fire Vehicle Facility expires on December 31,
2021. This is a reminder that permit renewal applications are due 180 days prior to
expiration. We do not have a record of receiving a renewal application.
Please submit a completed permit renewal application along with a $505.00 fee for
permit renewal. Also please include a designer's certification for the project. Application
forms for renewal can be found on our website at:
httos://deq.nc gov/about/divisions/energy-mineral-land-resources/energy-mineral-land-
rules/stormwater-program/post-construction. North Carolina General Statutes and the
Coastal Stormwater rules require that this property be covered under a stormwater
permit. Failure to maintain a permit subjects the owner to assessment of civil penalties.
If you have questions, please feel free to contact me at [phone]. 1 will be glad to
discuss this by phone or meet with you. If you would like, I can e-mail you a copy of the
application form. You can request a copy by e-mailing me at roger.thorpe(@ncdenr.gov.
Sincerely
©�
l Roger K. Thorpe
Environmental Engineer
North Carolina Department of Environmental Quality I Division of Energy, Mineral and Land Resources
Washington Regional Office 1 943 Washington Square Mall I Washington, North Carolina 27889
252.946.6481

P-141 EMS/FIRE VEHICLE FACILITY
CHERRY POINT MARINE CORPS AIR SERVICES
STORMWATER MANAGEMENT PROJECT NARRATIVE
The Department of the Navy is applying for a stormwater management permit with the high density option and is
located in the MCAS Cherry Point base, in Craven County. The purpose of the project is to construct an emergency
fesponse services building at the Cherry Point Marine Corps Air Station. The project will provide emergency
services for the air base. The project is located on a previously developed site that has since been cleared.
Construction includes a new building, associated parking, sidewalks, storm water control devices and necessary
utilities. This project is not located in a flood way, nor do any wetlands or riparian buffers exist on the project site.
This project is located in the Neuse River Basin. Based on the soils report provided the infiltration rate of the site is
between 0.12 in/hr and 0.79 in/hr. and the seasonal high water table is 5'-6' below grade.
After completion, the site will go from an impervious surface percentage of 12 % to 33 % of the disturbed area.
Existing impervious surfaces currently drain across the poorly maintained grassed area or directly to the roadside
ditches, neither of which is directed to a stormwater BMP. To help promote infiltration into existing soils and treat
the stormwater runoff, the project has a number of bio-retention cells throughout the site. The cells have been
placed in locations that, in conjuction with grading, the bio-retention cells will treat more then the net increase in
impervious surface for this project. The site will also promote sheet flow across natural ground, and flow through
open grassed channels prior to stormwater entering a pipe system. The bio-retention cells have been designed using
the North Carolina Department of Natural Resources BMP Manual as a model. Due to limited depths and seasonal
high water table the bio-retention cells are designed as grass cells, requiring 2' of appropriate soil media. Due to the
limited infiltration rate of the surrounding soils the bio-retention cells must be designed with under drains to prevent
problems from long term standing water.
As shown in the provided calculations the bio-retention cells are designed to hold the first 1.5" rainfall event. The
calculations show the runoff volume to each cell and the available storage of each cell prior to stormwater entering
the bypass structure. The first 1.5" rain event will permeate through the bio-retention cells at an appropriate rate
(2"/hr). While stormwater is passing through the bio-retention cells it will allow for some amount of infiltrate to the
surrounding soils. Rainfall events larger then 1.5" will overflow into the control structure and to the existing base's
stormwater pipe system. The parking area and surrounding sidewalks not draining to a bio-retention cell will sheet
flow across a grassed area prior to entering an adjacent roadside open channel or nearby existing stormwater
structure. The remaining impervious surface, primarily the entry/exit drives, will be directed to a roadside open
channel prior to entering the base's stormwater pipe system. Due to the minimal pipe and channel longitudinal
slopes the expected velocity of the stormwater through the existing open channels is less than 2.0 ft/sec during a 10-
year rainfall event. The acceptable velocity over sandy soils is 2.5 ft/sec, 4.0 ft/sec for grass of uncertain
maintenance and 5.0 ft/sec for maintained grass. The site will be sodded for permanent stabilization; therefore,
channel lining/reinforcement is not necessary.
The cells have also been designed to control the 1-year, 24 hr rainfall event. Ensuring the post -developed peak
runoff does not exceed the pre -developed runoff. As shown this project greatly reduces the peak runoff from the
pre-existing conditions. A portion of this comes from the detention properties of the bio-retention cells. As
previously mentioned, this project will be sodded, not seeded, once completed. As a result the runoff characteristics
of the lawn area will improve compared the current, poorly maintained, lawn area on the site
George Finch/Boney and Associates, P.A.
Daniel Woods, PE

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STORMWATER SUBMITTAL REQUIREMENTS
INFILTRATION/EXFILTRATION SYSTEMS
Basins and Trench
Objective
A. Collect all runoff from all BUA (proposed and/or existing and/or offsite) as the case may be,
by any means including piping or swales, and direct it to the infiltration system.
B. Check the proposed basin/ trench design to make sure it meets or exceeds the minimum
design criteria for design storm, volume and drawdown.
It. What makes up a complete infiltration basin / trench application package?
A. Two sets of sealed, signed & dated layout & grading plans with appropriate details.
B. Completed application with supplement(s), SWU-101, SW401-Infiltration Trench, SW401-
Infiltration Basin, and inspection and maintenance agreements.
C. Deed restriction document, if applicable. (subdivisions & projects with out parcels)
D. Sealed, signed & dated calculations.
E. A soils report containing information in regard to the soil type, boring locations, seasonal high
water table elevation and expected infiltration rate.
F. Chlorides test results must be provided if the project is within '% mile of SR waters (Phase II).
(This is only required to test out of SR water treatment requirements) '
III., BIMS entry (for DWQ use only)
Enter & track application acknowledged date, review date, add info requested/received dates, permit
issue dates, and drainage area info. Best done after the add info letter is written and before sending
permit up for signature.
IV. Shell documents (for DWQ use only)
Permit shells: s:\wqs\stormwater\shell\shighcom in basin
S:\wqs\stormwater\shells\highcomintrench
s:\wqs\stormwater\shells\highsubin basin
s:\wqs\stormwater\shells\highsubintrench
Calculations: s:\wqs\stormwater\excel spread sheets\inbasin
s:\wqs\stormwater\excel spreadsheets\intrench
V. Review Procedure- look for consistency between the various elements of the package- application,
plan and calculations.
A. APtP/LICATION
V
1. Original signatures are required. Photocopied signatures cannot be accepted.
2. A completed infiltration basin or infiltration trench supplement, one for each proposed
system. _Asigned—dated and notarized Inspection-and_Maintenance Agreement for
each proposed system with Wan signature.
3. ✓ The elevations, areas and volumes reported on the supplement match up to the
numbers used in the calculations and shown on the plan details.
4.Built-upon areas are reported in square feet in Section 111.6.
5. i/Receiving stream name and classification.
6.(Section 111.6 is filled in -cannot be left blank. One column must be filled in for each
proposed infiltration basin or trench.
7.1/ If the applicant is a corporation, partnership or LLC, look it up on the Secretary of State
Corporations Database. Make sure corporation is spelled correctly (capitalization and
punctuation matter) and that the person signing the application is at least a vice-
president in the corporation, a General Partner in the partnership, a member in a
member -managed LLC, or the manager of a manager -managed LLC. Need
documentation to support if the Articles of Incorporation do not list the members or
managers of the LLC. If an agent signs, then a letter of authorization is needed from the
president, vice president, general partner, member or manager.
8.f� For subdivided projects, a signed and notarized deed restriction statement must be
p"rovided.
9. L Soils report with the SHWT, Soil type and expected infiltration rate.
0 & IA A �C�J- MCA

Infiltration Basin & Trench, cont.
B. CALCULATIONS
1. The basin or trench must draw down within 5 days. Spray irrigation is not acceptable as
the sole means of drawdown.
2. The design storm is 1.5" if the project is subject to Phase II or is sited within''/1 mile of
and draining to SA waters. The design storm for projects subject to Phase II sited
within '/2 mile of and draining to SR waters must treat the difference between the pre
and post development conditions for the 1-yr 24-hr storm. Otherwise, use 1" design
storm.
3. Report the bottom surface area.
4. Report the surface area at the overflow elevation.
5. Show the calculation for the minimum required volume.
6. Provide a table of elevations, areas, incremental volumes and accumulated volumes to
demonstrate that the minimum required volume has been provided.
7. Calculations are signed, sealed & dated.
8. Report the Drainage Area and Built -upon area for each basin or trench.
9. The seasonal high water table must be at least 24" below the proposed bottom
elevation of the system. For Phase II projects, at least 12" of this must be in naturally
occurring soils.
10. All runoff in excess of the design storm must bypass to a vegetated filter prior to
entering the basin or trench. If the system is designed to store a larger design storm
(generally 2-3 times the minimum), the requirement for an offline bypass can be waived.
Please contact the Division to determine what design storm is appropriate for the
project.

Infiltration Basin & Trench, cont.
C. PLANS - Plan sheets should be kept to a minimum. For small commercial single basin
projects, the plan set could consist of only 2 or 3 sheets, layout, grading and details. For
larger projects, show as much information as possible on as few sheets as possible, without
cluttering,them up.
1. ✓ D6velopment/Project Name
2. ✓Engineer name and firm.
3. t//Legend
4.t/ / North Arrow
5. Location Map with nearest intersection of two major roads shown. Major road is any 1,
/2, or 3 digit NC, US or interstate highway.
6. ✓ Scale- standard engineering scale, no off-the-wall stuff.
7. Date
8. t/ Revision number and date, if applicable.
9.Original contours, proposed contours, spot elevations, finished floor elevations, pipe
inverts, swale inverts, etc.
10— Existing drainage (piping, swales, ditches, ponds, etc.), including off -site. Include a map
delineating the offsite drainage areas.
111 Property/Project boundary lines, bearing & distances.
12�,,JJvvl1can High Water Line or Normal High Water Line, if applicable.
13i Drainage easement locations shown on the plans along with their width.
14Wetlands delineated, or a note on the plans that none exist. Provide a copy of the
wetlands delineation map signed by the Corps of Engineers, or have the applicant
include a copy of the unsigned delineation map submitted to the Corps. Infiltration
systems may not be located in wetlands unless a permit to fill those wetlands has been
✓obtained and the soils meet the SHWT and hydraulic conductivity requirements.
15. Details forthe roads, parking, cul-de-sacs, including sidewalkwidth, radii, dimensions &
,j slopes.
16,rNApartment / Condo development- provide a typical building footprint with dimensions,
and note all concrete and wood deck areas.
171 The drainage area for each basin or trench is clearly delineated and numbered to match
up to the calculations and supplement. Drainage area delineation is best done as a
separate plan sheet.
18 A basin section detail showing bottom and storage elevations, 3:1 side slopes. The side
slopes of an infiltration basin are not restricted to vegetation. They may be hardened
with rock, timber, concrete, decorative brick, etc.
19' A trench section detail with the perforated pipe diameter, filter fabric wrapped around
the pipe and around the trench, trench height and width, rock fill type.
20 If using a pre-fab chamber structure, provide details of the chamber, including model #,
length, width, chamber volume and number of chambers being used.
21. A bypass structure detail is provided showing a trash rack with 56" square openings,
and the necessary bypass weir or pipe elevation. Several types of bypass structure
/designs are acceptable.
22. Dimensions for each line and arc formed by the bottom contour of an infiltration basin.
23.V All runoff in excess of the design storm must pass through a vegetated filter prior to
being discharged into the receiving stream. The filter must be 50' long for SA waters
/and 30' long for non -SA waters.
24'// All infiltration systems must be located at least 50' from the MHW line of surface waters.
251 Vegetation is specified for basin slopes not being hardened. Weeping Love Grass is not
suitable as a permanent vegetated cover for side slopes.
2 All roof drainage must be directed to the system. Show the roof drain collection piping
on the plans. This is especially necessary for projects where the buildings back up the
/property lines where roof drainage may leave the site prior to going through the system.
27i. Monitoring wells may be required on a case -by -case basis.

For OENR Use ONLY
AW�r ✓
r,Renewer:
�/ North Carolina Department of Environment and O� ,
.p "YY ®p Natural Resources 5ub
NCIDENR Request for Express Permit Review Time.
confirm:
FILL-IN all the information below and CHECK the Permit(s) you are requesting for express review. FAX or Email the completed farm to Express
Coordinator along with a completed DETAILED narrative n yPD
site plaF file) and vicinitv map Lame items expected in the apohcation oackaae Of the project location. Please include this form in the application oackaae.
• Asheville Region -Alison Davidson 828-296.4698;a/ison davidson(
• Fayetteville or Raleigh Region -David Lee 919-791.4203 ddavfd lee(a)ncderlraov
• Mooresville & -Patrick Grogan 704-663-3772 orpatrfcl(aroaan(a)ncdenr.
• Washington Region -Lyn Hardison 252-946-9215orlyn.hardison(ftcdenraov
• Wilmington Region -Janet Russell 910-350-2004orianet.russell(alncdenraov
, cdenr aov
gov
NOTE: Project application received after 12 noon will be stamped in the following work day.
P'
Permits of rogues-,
SW
SIN
SW
SW
Sw
ro)ect Name. P-141 EMS/FIRE VEHICLE FACILITY County: CRAVEN
Applicant: GEORGE W. RADFORD Company: ENVIROMENTAL AFFAIS DEPARTMENT
Address: PSC BOX 8D06 City: CHERRY POINT State: NC Zip: 28533
Phone: [phone], Fax: _ _ Email:
Physical LOcation:MCAS NAVAL BASE
Project Drains into SC waters — Water classification SW (for classification see-_h_n://h2o,enr state nc us/bims/reports/rel)ortsWB html)
Project Located in NEUSE River Basin. Is project draining to class ORIN waters? N, within %mile and draining to class SA waters N or within 1 mile and
draining to class HOW waters? N
Engineer/Consultant ROBERT GRAHAM Company: GFBA 5%AJ —1I 0 120 Z Address: 309 N. BOYLAN AVE. City: RALEIGH State: NC Zip: 27603-_ EXPRESS
Phone:[phone], Fax: [phone] Email: [e-mail] �urrrfNdPR
SECTION ONE: REQUESTING A $COPING MEETING ONLY
[IScoping Meeting ONLY ® DWQ, ❑ DCM, ® DLR, ❑ OTHER: DEC��++1 3 Z��O
SECTION TWO: CHECK ONLY THE PROGRAM IS) YOU ARE REQUESTING FOR EXPRESS PERT ITNT NG ®ENR
❑ 401 Unit ❑ Stream Origin Determination: _ # of stream calls — Please attach TOPO map marking the areas in questions
❑ IntermittenVPerennial Determination: _ # of stream calls — Please attach TOPO map marking the areas in questions
❑ 401 Water Quality Certification ❑ Isolated Wetland (_linear It or --_acres)
❑ Riparian Buffer Authorization ❑ Minor Variance ❑ Major General Variance
® State Stonnwater ® General ❑ SFR, ❑ SFR < 1 ac. ❑Bkhd & Bt Rmp, ® Clear &Grub, ®Utility ❑Other
❑ Low Density ❑ Low Density -Curb 8 Gutter _ # Curb Outlet Swales ❑ Off -site (SW _ (Provide permit #)j
❑ High Density -Detention Pond _ # Treatment Systems [I High Density -Infiltration _ #Treatment Systems
® High Density -Bio-Retention 4 # Treatment Systems ❑ High Density —SW Wetlands _ # Treatment Systems
❑ High Density -Other _ # Treatment Systems / ❑ MOD: El Major ❑ Minor ❑ Plan Revision ❑ Redev. Exclusion SW (Provide permit 4)
❑ Coastal Management ❑ Excavation 8 Fill
❑ Bridges &Culverts ❑Structures Information
❑ Upland Development ❑ Marina Development ❑ Urban Waterfront
® Land Quality ® Erosion and Sedimentation Control Plan with 3_9 acres to be disturbed.(CK # (Ci is37 (for DENR use))
SECTION THREE — PLEASE CHECK ALL THAT IS APPLICABLE TO YOUR PROJECT for both scoping and express meeting request
Wetlands on Site ❑ Yes.® No Buffer Impacts: ® No ❑ YES: _acre(s)
Wetlands Delineation has been completed: ❑ Yes ® No Isolated wetland on Property ❑ Yes ® No
US ACOE Approval of Delineation completed: ❑ Yes ® No 404 Application in Process wl US ACOE: ❑ Yes Received from US ACOE El Yes ® No PP ® No Permit
Fee Sol-- mulnnlu nnrmlle a•r,a.o « ni :vl'Ti --Pnr DEMi use end)___-_
Total Fee Amount S iW
O-"--------
CAS'
SUBMITTAL DATES
Fee
SW LD, ❑ Gen)
7ni;i
Variance (❑ Mai; Min)
$
LaS
401:
Stream Deter,_
$
$
NCDENR EXPRESS March 2009

Penne No:
(to be asvg-wd by OWQ)
III. REQUIRED ITEMS CHECKLIST
Please indicate the page or plan sheet numbers where the supporting documentation can be found. An Incomplete submittal package will
result in a request for additional information. This will delay final review and approval of the project Initial in the space provided to
indicate the following design requirements have been met. If the applicant has designated an agent, the agent may initial below. If a
requirement has not been met, attach justification.
Pagel Plan
Initials/ Sheet No.
1. Plans (I- - 50' or larger) of the entire site showing:
C -c?07
- Design at ultimate build -out,
- Off -site drainage (if applicable),
- Delineated drainage basins (include Rational C coefficient per basin),
- Cell dimensions,
- Pretreatment system,
- High flow bypass system,
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement,
y t v G aO1" 2. Plan details (1' = 30' or larger) for the bioretention cell showing
6—';ip;7
-Cell dimensions
Pretreatment system,
- High flow bypass system,
L —3p3
- Maintenance access,
- Recorded drainage easement and public right of way (ROW),
- Design at ultimate buil"ut,
- Off -site drainage (if applicable),
- Clean out pipe locations,
- Overflow device, and
- Boundaries of drainage easement.
- Indicate the P-Index between 10 and 30
j9hl I— 50 3. Section view of the bioretention cell 0' = 20' or larger) showing:
Side slopes, 3:1 or lower
- Underdrain system (if applicable), and
- Bioretention cell layers [ground level and slope, pre-treatment, ponding depth, mulch depth, fill media
depth, washed sand, filter fabric (or choking stone if applicable), #57 stone, undendrains (if applicable),
A �! SHWT level(s), and overflow structure]
Ar E44 04. A soils report that is based upon an actual field investigation, soil borings, and infiltration tests. The
results of the soils report must be verified in the field by DWO, by completing & submitting the soils
investigation request form. County soil maps are not an acceptable source of soils information. All
elevations shall be in feel mean sea level (fmsl). Results of soils tests of both the planting soil and the in
situ soil must include:
- Soil permeability,
Soil composition (% sand, % fines, %organic), and
P-index.
S. A detailed planting plan IV = 20' or larger) prepared by a qualified individual showing:
- A variety of suitable species,
- Sizes, spacing and locations of plantings,
- Total quantity of each type of plant specified,
- A planting detail,
- The source nursery for the plants, and
- Fertilizer and watering requirements to establish vegetation.
Okl L �ds 6. A construction sequence that shows how the bioretention cell will be protected from sediment until the
iwentire drainage area is stabilized.
- 46M&D 7. The supporting calculations (including underlrain calculations, if applicable).
Qv �Tr9t��D B. A copy of the signed and notarized inspection and maintenance (AM) agreement.
)VA 9. A copy of the deed restriction.
Form SW401-15ioreter�tion-Rev.7 Part III, Pape 1 of 1

isZs,
Cell Drainage
1=P
(new Pond)
S4 Reach Z4 Link
Celll2 rainage
2P
(new Pond)