SW7040404_HISTORICAL FILE_20040406

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW7d�
DOC TYPE
El CURRENT PERMIT
❑ APPROVED PLANS
�D HISTORICAL FILE
DOC DATE
�J71
YYYYMMDD

RECEIVED
STORMWATER NARRATIVE APR -6 2004
PROPOSED WALGREENS
NEUSE BOULEVARD and DEGRAC'f ENREID AVENUE DWQ-WARD
NEW BERN, NORTH CAROLINA
This project includes the construction ofa new Walgreens facility on 1.59 acres of land located
at the corner of Neuse Boulevard and DeGraffenreid Avenue in New Bern, North Carolina. The
subject property consists of five separate parcels that were recombined by the developer into one
tract. Each of the five parcels was previously developed with buildings and parking areas. The
subject property is presently approximately 99% covered with impermeable buildings and traffic
and parking areas. It is proposed that the existing development on each of the parcels be
demolished and that the entire site be razed. The Walgreens facility and parking and traffic
circulation areas will be developed as presented on the project plans. Under the proposed
development, the site will be developed to 77.5% built -upon area. In order to properly execute
the project, a Coastal Stornnvater permit, as well as a City of New Bern Stormwater Permit, must
be obtained for the project.
In that the existing site is almost completely covered with impermeable surfaces, and no
stormwater treatment devices are located on the present site, the proposed development
represents a significant improvement as far as stormwater collection, retention and treatment is
concerned. It is requested that the proposed development be approved under the Coastal
Stormwater Regulations as redevelopment; although, an engineered stormwater system is
proposed which complies with Coastal Stormwater Regulations.
In order to comply with the Neuse River Nutrient Removal Strategy, as outlined in the City of
New Bern Stormwater Manual, structural Best Management Practices (BMP's) must be
employed on the site. Bio-retention areas and vegetated swales are proposed as a means of
nitrogen removal and stormwater treatment to comply with the City of New Bern Stormwater
Program.
Two bio-retention areas are proposed for the subject property. The bio-retention areas will be
constructed by over excavating the bottom and providing a sand layer to encourage infiltration.
The bio-retention areas will be vegetated as outlined on the project plans. The bio-retention
areas were sized in accordance with the North Carolina Department of Enviromnent and Natural
Resources Standards for Structural BMP's for stormwater treatment and control.
Stormwater runoff from the impermeable areas of the subject property will be routed to one of
two bio-retention areas proposed for the site. The bio-retention areas are designed to be flooded
to a maximum depth of nine inches. A flow spreading swale is proposed along the edge of -the
bio-retention area adjacent to the pavement to encourage the diffuse flow into the bio-retention
area. The flow spreading swale has an overflow elevation at the end that will bypass the excess
volume. Any excess runoff that does not enter the bio-retention areas is routed to vegetated

swales located along the southwestern corner of the property. These vegetated swales flow to a
new drop inlet and discharge to the public stornnwater system along Neuse Boulevard through a
15-inch discharge pipe.
The proposed engineered stormwater system provides treatment levels as recommended in the
structural 13MP manual. Additionally, the bio-retention area and vegetated swale provide the
nitrogen removal required by the City of New Bern Stormwatcr Regulations.

Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FEIVED
INFILTRATION BASIN SUPPLEMENT APR - 6 2004
This form may be photocopied for use as an original
DWO Stormwater Management Plan Review: DWQ-WAR0.-'_•
A complete stormwater management plan submittal includes a stormwater management permit application, an
infiltration basin supplement for each system, design calculations, soils report and plans and specifications
showing all stormwater conveyances and system details.
. i
I. PROJECT INFORMATION
Project Name: walgreens
Contact Person: John Haroldson Phone Number: ( 252 ) 638-8300
t.,
This worksheet applies to: Basin No. Bio-Retention Area #1
(as identified on plans)
in Drainage Area
(om Form SWU-101)
II. DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be
based upon an actual field investigation and soil borings. County soil maps are not an acceptable
source of soils information. All elevations shall be in feet mean sea level (fmsl).
Soils Report Summary
Soil Type
Infiltration Rate
SHWT Elevation
Basin Design Parameters
Design Storm
Design Volume
Drawdown Time
Basin Dimensions
Basin Size
Basin Volume Provided
Basin Elevations
Bottom Elevation
Storage Elevation
Top Elevation
Urban Land Complex (Autryville) >,
0.6 01or cf/hr/sf (circle appropriate units)
6.0' fmsl (Seasonal High Water Table elevation)
1 inch (1.5 inch event for SA waters, 1 inch event for others)
1,902 c.f.
0.625 days
ft. x ft. = 2, 640 sq. ft. (bottom dimensions)
1,980 c.f.
18.9 fmsl
19.6 fmsl
19.6 fmsl
Form SWU-103 Rev 3.99 Page 1 of 3

III. REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best. Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 214.1008.
Initial in the space provided to indicate that the following design requirements have been met and supporting
documentation is attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the
agent may initial below. Attach justification if a requirement has not been met.
Applicants Initials
a.
System is located 50 feet from class SA waters and 30 feet from other surface waters.
b.
System is located at least 100 feet from water supply wells.
c.
Bottom of system is at least 2 feet above the seasonal high water table.
d.
Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
e.
System is not sited on or in fill material or DWQ approval has been obtained.
*;2 f.
System is located in a recorded drainage easement for the purposes of operation and
maintenance and has recorded access easements to the nearest public right-of-way.
qko-- g.
Drainage area for the device is less than 5 acres.
® h.
Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is
attached.
" i.
System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event
for areas draining to SA waters ). Design volume and infiltration calculations attached.
4 _6P j.
System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage. Calculations attached.
k.
All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
40 1.
A pretreatment device such as a catch basin, -grease trap, filter strip, grassed swale or
sediment trap is provided.
40 m.
Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches
or dense vegetative cover is provided.
n.
Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
® o.
Flow distribution mechanism within the basin is provided.
1p_ p. A benchmark is provided to determine the sediment accumulation in the pretreatment
device.
60 q. Runoff in excess of the design volume bypasses off-Iine systems (bypass detail provided).
r. System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days. A soils report and all
pertinent draw -down calculations are attached.
s. Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized.
Form 5WU-103 Rev 3.99 Page 2 of 3

I7. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT
1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion,
trash accumulation, vegetative cover, and general condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow
vegetated cover to maintain a maximum height of six inches, and remove trash as needed.
3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow
structures for blockage and deterioration. Remove any blockage and repair the structure to approved
design specifications.
4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when
depth in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored
to the original design depth without over -excavating. Over -excavating may cause the required water
table separation to be reduced and may compromise the ability of the system to perform as designed.
Removed sediment shall be disposed of in an appropriate manner and shall not be handled in a manner
that will adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream,
etc.).
A benchmark shall be established in the pretreatment unit. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used
to determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the design depth reads 1 •2 feet in the pretreatment unit, the sediment shall be
removed from both the pretreatment unit and the infiltration basin.
5. If the Division determines that the system is failing, the system will immediately be repaired to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater
control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the five
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print Name and Title: John Haroldson, Member/
Address:
252-638-8300
Signature:
Date:
Note: The leAlly responsible parry should not be a homeowners association unless more than 50% of the lots have been sold and
a resident of the subdivision has been named the president.
t Beth Simmons , a Notary Public for the State ofNoxth Carolina , County of
Craven , do hereby certify that John Haroldson personally appeared before me this,j 4
day of -X(J-4 , and acknowledge the due execution of the forgoing infiltration basin maintenance
N219Is
e e S� �ittn ss my hand and official seal,
5EA, Aril 22 2004
4 , ,My commission expires P
�4C,�prm SWU-103 *$ 3.99 Page 3 of 3

Permit No.
(to be provided by DWQ)
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality ncaVED
STORMWATER MANAGEMENT PERMIT APPLICATION FORM APR-6 2004
INFILTRATION BASIN SUPPLEMENT DWQ-WAR®
This form may be photocopied for use as an original
DWQ Stormwater Management Plan Review:
A complete stormwater management plan submittal includes a stormwater management permit application, an
infiltration basin supplement for each system, design calculations, soils report and plans and specifications
showing all stormwater conveyances and system details.
I. PROJECT INFORMATION
Project Name: Walgreens
Contact Person: John Haroldson Phone Number: ( 252 ) 638-8300
This worksheet applies to: Basin No. Bio-Retention Area #2 in Drainage Area 1
(as idenr fed on plans) (from Form SWU-101) ,
II: DESIGN INFORMATION - Attach supporting calculations/documentation. The soils report must be
based upon an actual field investigation and soil borings. County soil maps are not an acceptable
source of soils information. All elevations shall be in feet mean sea level (fins]).
Soils Report Summary
Soil Type
Infiltration Rate
SHWT Elevation
Basin Design Parameters
Design Storm
Design Volume
Drawdown Time
Basin Dimensions
Basin Size
Basin Volume Provided
Basin Elevations
Bottom Elevation
Storage Elevation
Top Elevation
Urban Land Complex (Autryville)
0.6 tn/hr r cf/hr/sf (circle appropriate units)
6-4 fmsl (Seasonal High Water Table elevation)
inch (1.5 inch event for SA waters, I inch event for others)
2,472 c.f.
0.625 days
ft. x
2,573 c.f.
19.5
fmsl
20.2
fmsl
20.2
fmsl
ft. = 2, 716 sq. ft. (bottom dimensions)
Form SWU-103 Rev 3.99 Page 1 of 3

IIL REQUIRED ITEMS CHECKLIST
The following checklist outlines design requirements per the Stormwater Best Management Practices Manual
(N.C. Department of Environment, Health and Natural Resources, February 1999) and Administrative Code
Section: 15 A NCAC 2H .1008.
Initial in the space provided to indicate that the following design requirements have been met and supporting
docume`tio& ntais attached. If the applicant has designated an agent in the Stormwater Management Permit
Application Form, the agent may initial below. Attach justification if a requirement has not been met.
Applicants Initials
_A-2- a. System is located 50 feet from class SA waters and 30 feet from other surface waters.
If— b. System is located at least 100 feet from water supply wells.
c. Bottom of system is at least 2 feet above the seasonal high water table.
d. Bottom of the system is 3 feet above any bedrock or impervious soil horizon.
7 _ e. System is not sited on or in fill material or DWQ approval has been obtained.
'Y --- f. System is located in a recorded drainage easement for the purposes of operation and
maintenance and has recorded access easements to the nearest public right-of-way.
r< g. Drainage area for the device is less than 5 acres.
h. Soils have a minimum hydraulic conductivity of 0.52 inches per hour and soils report is
attached.
4. i
System captures and infiltrates the runoff from the first 1.0 inch of rainfall (1.5 inch event
for areas draining to SA waters ). Design volume and infiltration calculations attached.
System is sized to take into account the runoff at the ultimate built -out potential from all
surfaces draining to the system, including any off -site drainage. Calculations attached.
40 k. All side slopes stabilized with vegetated cover are no steeper than 3:1 (H:V).
V_ 1. A pretreatment device such as a catch basin, grease trap, filter strip, grassed swale or
sediment trap is provided.
m. Bottom of the device is covered with a layer of clean sand to an average depth of 4 inches
or dense vegetative cover is provided.
D&. n. Vegetated filter is provided for overflow and detail is shown on plans (Required minimum
length is 50 feet for SA waters, 30 feet for other waters).
%74-- o
,VJ__ p
Flow distribution mechanism within the basin is provided.
A benchmark is provided to determine the sediment accumulation in the pretreatment
device.
Runoff in excess of the design volume bypasses off-line systems (bypass detail provided).
rf� r. System is designed to draw down the design storage volume to the proposed bottom
elevation under seasonal high water conditions within five days. A soils report and all
pertinent draw -down calculations are attached.
s. Plans ensure that the installed system will meet design specifications (constructed or
restored) upon initial operation once the project is complete and the entire drainage area is
stabilized.
Form 5WU-103 Rev 3.99 Page 2 of 3

IV. INFILTRATION BASIN OPERATION AND MAINTENANCE AGREEMENT
1. After every runoff producing rainfall event and at least monthly inspect the infiltration system for erosion,
trash accumulation, vegetative cover, and general condition.
2. Repair eroded areas immediately, re -seed as necessary to maintain adequate vegetative cover, mow
vegetated cover to maintain a maximum height of six inches, and remove trash as needed.
3. After every runoff producing rainfall event and at least monthly inspect the bypass, inflow and overflow
structures for blockage and deterioration. Remove any blockage and repair the structure to approved design
specifications.
4. Remove accumulated sediment from the pretreatment system and infiltration basin annually or when depth
in the pretreatment unit is reduced to 75% of the original design depth. The system shall be restored to the
original design depth without over -excavating. Over -excavating may cause the required water table
separation to be reduced and may compromise the ability of the system to perform as designed. Removed
sediment shall be disposed of in an appropriate manner and shall not be handled in a manner that will
adversely impact water quality (i.e. stockpiling near a stormwater treatment device or stream, etc.).
A benchmark shall be established in the pretreatment unit. The benchmark will document the original
design depth so that accurate sediment accumulation readings can be taken. The measuring device used to
determine the depth at the benchmark shall be such that it will give an accurate depth reading and not
readily penetrate into accumulated sediments.
When the design depth reads 1.2 feet in the pretreatment unit, the sediment shall be
removed from both the pretreatment unit and the infiltration basin.
5. If the Division determines that the system is failing, the system will immediately be repaired to original
design specifications. If the system cannot be repaired to perform its design function, other stormwater
control devices as allowed by NCAC 2H .1000 must be designed, approved and constructed.
I acknowledge and agree by my signature below that I am responsible for the performance of the five
maintenance procedures listed above. I agree to notify DWQ of any problems with the system or prior to any
changes to the system or responsible party.
Print Name and Title: John Haroldson, Member/Manager
Address
P.O. Box 1169 New Bern, NC 28563
Phone: [phone]
Signature:
Date:
Note: Ilre le(ally responsible party should trot be a lronreon,trcrs cissociatiorr runless more tlunr JO% of the lots !rave beerr sold cnrcl a
resiclerrt of the subdivision has been ncnrrecl the president.
l Beth Simmons la Notary Public for the State of North Carolina county o1'
Craven do hereby certify that John Haroldson personally appeared before me this
day of _aCO-i and acknowledge the dire execution of the forgoing infiltration basin maintenance requirements.
Witness r0dijigoind official seal,
Y
0 c,
a-103
e
My commission cxpires April 22, 2004
Page 3 of 3

3 AVOLIS ENGINEERING, P.A.
Z^L, P.O. Box 15564 • New Bern, North Carolina 28561 • [phone]
March 16, 2004
Mr. Bill Moore
Environmental Engineer
NCDENR - Water Quality Section
943 Washington Square Mall
Washington, NC 27889
RE: Proposed Walgreens
Neusc Boulevard and DeGraffenreid Avenue
New Bern, North Carolina
AE Project No. 04011
Dear Bill:
RECEIVED
APR - 6 2004
DWQ-WARD
Enclosed please find our Stormwater Pert -nit submittal for the above -referenced project
consisting of:
• Stormwater Permit (Original and One Copy)
• Project Plans (2 Sets)
• Stormwater Calculations (2 Copies)
• $420 Permit Fee
Should you have any questions relating to this matter or need any additional information or
assistance, please do not hesitate to call.
Sincerely,
vin Avolis, P.E.
Vi e-President

APR - 6 2004
STORMWATER CALCULATIONS
WALGREENS
NEUSE BOULEVARD and DEGRAFFENREID AVENUE
NEW BERN, NORTH CAROLINA
Prepared by:
Avolis Engineering, P.A.
P.O. Box 15564
New Bern, NC 28561
[phone] Office
[phone] Fax
April 1, 2004

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