SW7080217_HISTORICAL FILE_20080225

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE(��
YYYYMMDD

PA
STORMWATER MANAGEMENT PLAN
For:
Parking Lot Expansion
at
Craven Community College
New Bern, NC
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FEB 2 5 2008
DWQ-WARD

STORMWATER MANAGEMENT PLAN
Craven Community College Parking Lot Expansion
PROJECT DESCRIPTION
This document is to serve as the Stormwater Management Plan for the proposed
parking lot expansion at Craven Community College in New Bern, NC. This project
consists of expanding an existing parking lot. The parking lot expansion will be
approximately 300 feet by 260 feet and will disturb 2.90 acres. The additional parking is
necessary to provide additional spaces for the expanding campus.
CONTACT INFORMATION
Prime Consultant:
HSMM
Attn: Donald Hurlbut, PE
4141 Parklake Avenue, Suite 100
Raleigh, NC 27612
Telephone: [phone]
Fax: [phone]
For any questions about this Stormwater Management Plan, please contact:
Sungate Design Group, P.A.
Attn: Josh Dalton, PE
915 Jones Franklin Road
Raleigh, NC 27606
Telephone: [phone]
Fax: [phone]
IDENTIFY PROJECT INVOLVEMENT
This project is in the Neuse River Basin and drains to an Unnamed Tributary to
Wilson Creek. Wilson Creek is classified as C, Sw, NSW (Stream Index # 27-101-37)
Neuse River Buffer Rules are applicable for this project; however no buffered streams
exist on the property. No streams or wetlands are impacted by this project as it is located
in an upland area. Wetland limits were previously delineated and have been shown on the
plans.
The stormwater design for this project is considered "High Density". The
following requirements related to stormwater management that are necessary for project
approval include removal of 85% TSS, capturing and treating the "first flush" runoff

from the parking lot, and nitrogen export control.. The "first flush" event is defined as the
1.0-inch storm for this location. Also, the town of New Bern requires that there be no net
increase in peak discharge leaving a site from the predevelopment conditions for the 1-
year and 10-year 24-hour storm events.
SELECT AND IMPLEMENT BMP'S
Stormwater Wetland
Based on all of the requirements stated above, a stormwater wetland was selected
as the appropriate BMP for this site. Runoff from the site will be collected by a storm
drainage system and directed to an appropriately sized forebay to dissipate energy.
According to Natural Resource Conservation Service Soil Survey Maps, the existing site
consists of three soil types; Rains (Ra), Leaf (La), and Torhunta (To). A copy of the
geotechnical report is included for your use. According to the geotechnical report, the
seasonably low ground water elevation was approximately 6 feet below the natural
ground at approximately elevation 22.0 feet. Therefore, the deep pools of the stormwater
wetland have been specified at elevation 21.5 feet so that they are 6 inches below the
seasonably low ground water elevation. The field boring locations are shown on the plan
sheets.
A hydrologic/hydraulic model for the site and stormwater wetland was developed
using HydroCAD. The SCS/TR-55 method was used to develop runoff rates and inflow
hydrographs. A SCS Type III storm distribution was used for this site due to the coastal
location. As per the BMP Manual, the Simple Method was also used to calculate the
runoff from the 1.0-inch storm and compared with the SCS/TR-55 method. The runoff
volume calculated from the Simple Method was higher and therefore was used to size the
wetland volume and surface area and also used in the orifice drawdown calculations.
However, the routings included are from the HydroCAD SCS/TR-55 model.
The drainage area for the stormwater wetland is 1.81 acres with 1.64 acres of
proposed impervious surface and the remaining 0.17 acres will be landscaped islands.
No offsite drainage enters the stormwater wetland as it is located along the ridgeline.
Most contaminants are usually transported in the "first flush" runoff volume. For this
location, this is defined as the runoff volume from the 1.0-inch storm. The stormwater
wetland outlet structure orifice has been sized to release the runoff from the 1.0-inch
storm within the required 2 to 5 day time frame. The basin has also been sized to pass the
100-year storm without overtopping.
CONCLUSION
This Stormwater Management Plan represents an environmentally sensitive and effective
plan for handling the stormwater runoff from the project area.

2.5
For DENR Use ONLY
North Carolina Department of Environment and
Natural Resources
AIIAA Request for Express Permit Review
NCDENR
Revie r;..:xt" „ r
t i
Submit
Time:
Confirm
FILL-IN all the information below and CHECK the Permit(s) you are requesting for express review. FAX or Email the completed form to Express
Coordinator along with a completed DETAILED narrative, site plan (PDF file) and vicinity map (same items expected in the application package
of the project location. Include this form in the application package.
• Asheville Region -Alison Davidson 828-296-4698;alison.davidson
a(7ncmail.net
• Fayetteville or Raleigh Region -David Lee 919-791-4203; david.lee
a(7ncmail.net
• Mooresville & -Patrick Grogan 704-663-3772 or patrick.grogan(aitncmail.net
• Washington Region -Lyn Hardison 252-946.9215 or lyn.hardison(ancmail.net
• Wilmington Region -Janet Russell 910-350.2004 orjanet.russeli
ncmail.net
NOTE: Project application received after 12 noon will be stamped in the following work day.
Project Name: CRAVEN COMMUNITY COLLEGE PARKING LOT EXPANSION County: CRAVEN
Applicant: JOHNNY PETERSON Company: CRAVEN COMMUNITY COLLEGE
Address: 800 COLLEGE COURT City: NEW BERN, State: NC Zip: 28562
Phone:[phone] Fax:[phone] Email: pertersoi(a cravencc.edu 0WRESS
Project is Drains into NON SR waters Project Located in NEUSE River Basin
Engineer/Consultant: Josh Dalton, PE Company: Sungate Design Group, PA FEB $ 5 2008
Address: 915 JONES FRANKLIN ROAD City: RALEIGH, State: NC Zip: 27606 �� ®�
Phone:[phone] Fax::[phone] Email: Idalton(�sungatedesign.com
(Check all that apply)
❑ Scoping Meeting ONLY ❑ DWQ, ❑ DCM, ❑ DLR, ❑ OTHER:
❑ Stream Origin Determination: # of stream calls — Please attach TOPO map marking the areas in questions
® State Stormwater ❑ General ❑ SFR, ❑Bkhd & Bt Rmp, ❑ Clear & Grub, ❑ Utility
❑ Low Density ❑ Low Density -Curb & Gutter _ # Curb Outlet Swales ❑ Off -site [SW (Provide permit #)]
❑ High Density -Detention Pond _ # Treatment Systems ❑ High Density -Infiltration _ #Treatment Systems
❑ High Density -Bio-Retention _ # Treatment Systems ® High Density —Constructive Wetlands 1 # Treatment Systems
❑ High Density -Other _ # Treatment Systems ❑ MODIFICATION SW _ (Provide permit #)
❑ Coastal Management ❑ Excavation & Fill ❑ Bridges & Culverts ❑ Structures Information
❑ Upland Development ❑ Marina Development ❑ Urban Waterfront
® Land Quality ® Erosion and Sedimentation Control Plan with 2.90 acres to be disturbed.(CK #'� (for DENR use))
WETLANDS QUESTIONS MUST BE ADDRESSED BELOW A �' s
® Wetlands (401): Check all that apply
Wetlands on Site ® Yes ❑ No
Wetlands Delineation has been completed: ® Yes ❑ No
US ACOE Approval of Delineation completed: ® Yes ❑ No
404 Application in Process w/ US ALOE: ❑ Yes ® No
Permit Received from US ACOE ❑ Yes ® No
Fee Split for multiple permits: (Check#6"iec7Z31
Isolated wetland on Property ❑ Yes ® No
Buffer Impacts: ® No ❑ YES: acre(s)
Minor Variance: ® No ❑ YES
Major General Variance ® No ❑ YES
401 Application required: ❑Yes ® No If YES, ❑ Regular
Perennial, Blue line stream, etc on site ❑ yes ® No
For DENR use only
Total Fee Amount
t
SUBMITTAL DATES
Fee
SUBMITTAL DATES
Fee
CAMA
$
Variance ❑ Mal; ❑ Min
$
]SW D,❑LD,❑Gen)
2-Zs �:
$ r,'
401:
$
1LQS
2 -...t 9
$ cZ
Stream Deter,_
$

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Transmittal Sheet
HSMM
4141 Parklake'Avenue, Suite 100, Raleigh, North Carolina 27612
T 919 786 4883 F 919 786 4882
To: Lyn B. Hardison
One -Stop Permitting Coordinator
Customer Service Center
Washington Regional Office
943 Washington Square Mall
Date February 19, 2008
RE: Craven Community College
200 space parking lot design
Project No. 070700401 Phase: HSMM # 30220
We are sending you 4 ea. copies of the following enumerated ®Prints ❑Sepias ❑Shop Drawing
Sub
❑Samples ❑Brochures ❑Cat. Cuts ❑ Contracts ❑Letters ®Specifications
Lyn, Enclosed are 4 sets of Calculations and documentations and 4 sets of plans of the Craven Community
College Parking Lot project that Josh Dalton and I discussed with you on the 131h of the month.
We have addressed your comments in the attached plans and documentation. Please advise me or Josh if
vau have anv questions. Thanks
Our Comment:
Distribution For Your ®Action ❑Corrections ❑General Information
1. ❑Request ❑Resubmission ❑ Files
2.
3.
4.
5.
HSMM
Transmitted By ❑Mail Signature /G
❑UPS Name R. Donald Hurlbut, PE
® FedEx Title Project Manager
adm_trs 18 (rev. 05107)
k

MEMO TO: Attendees
FROM: Josh Dalton, PE
Sun -ate Design Group, PA
DATE: February 14, 2008
SUBJECT: Craven Community College
Parking Lot Expansion
ATTENDEES:
Lyn Hardison — One -Stop Permitting Coordinator
Scott Vinson, PE —NC DWQ
Samir Dumpor, PE — NC DWQ
Richard Peed, CPESC — NC LQS
Don Hurlbut, PE — HSMM
Johnny Peterson - Craven Community College VP of Finance and Admin.
,Josh Dalton, PE — Sungate Design Group
Meeting Minutes for Express Review
A meeting was held February 13, 2008 at the NCDENR Washington Regional Office to
discuss the permits for Craven Community College Parking Lot Expansion.
The following is a listing of items preliminary comments that needed to be addressed
before the project can be accepted into the Express Review process:
Plans
• Details are missing on plan sheets.
• A section view of the wetland needs to be added.
• Orifice hole diameter needs to be added to riser detail.
• Ground cover note on Erosion Control Sheet should state "21 calendar days"
instead of"15 workings days or 30 calendar days".
Stormwater Manasement Plan and Calculations
• On the Wetland Supplement Form, the shallow water top elevation should be
the permanent pool elevation.
• Include the Required Items Checklist section of the. Wetland Supplement
Form.
All of the above items have been addressed with the enclosed plans and calculations.