SW8020422_HISTORICAL FILE_20030414

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO. SW
I DOC TYPE 1 ❑ CURRENT PERMIT
❑ ' APPROVED PLANS
FVD HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
YYYYMMDD

State Stormwater Management Systems
Permit No. S W S 020422
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORM WATER MANAGEMENT PERMIT
HIGH DENSITY DEVELOPMENT
In accordance with the provisions of Article 21 of Chapter 143, General Statutes of North
Carolina as amended, and other applicable Laws, Rules, and Regulations
PERMISSION IS HEREBY GRANTED TO
Mr. George K. Coffin, Owner
128 South Water Street
New Hanover County
FOR THE
construction, operation and maintenance of an infiltration basin in compliance with the
provisions of 15A NCAC 2H .1000 (hereafter referred to as the "stormwater rules") and the
approved stormwater management plans and specifications and other supporting data as attached
and on file with and approved by the Division of Water Quality and considered a part of this
Pen -nit.
This permit shall be effective from the date of issuance until April 14, 2013, and shall be subject
to the following specified conditions and limitations:
1. DESIGN STANDARDS
1. This permit is effective only with respect to the nature and volume of stormwater
described in the application and other supporting data.
2. This stormwater system has been approved for the management of stormwater runoff as
described on page 3 of this permit, the Project Data Sheet. The stormwater control has
been designed to handle the runoff from 3,256 square feet of impervious area.
3. The tract will be limited to the amount of built -upon area indicated on page 3 of this
permit, and per approved plans.
4. All stormwater collection and treatment systems must be located in either dedicated
common areas or recorded easements. The final plats for the project will be recorded
showing all such required easements, in accordance with the approved plans.
5. The runoff from all built -upon area within the permitted drainage area of this project
must be directed into the permitted stormwater control system. A permit modification
must be submitted and approved prior to the construction of additional built -upon area
from outside of the approved drainage area.
2

State Stormwater Management Systems
Permit No. SW8 020422
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
128 South Water Street
Permit Number:
SW8 020422
Location:
New Hanover County
Applicant:
Mr. George K. Coffin
Mailing Address:
1920 Highway 54, Suite 510
Durham, NC 27713
Application Date:
March 6, 2003
River Basin / Receiving Stream:
Cape Fear / Cape Fear River
Index Number:
CPF-17 18-(71)
Classification of Water Body:
"SC"
Drainage Area, ftz:
3,908 square feet
Onsite, ft2:
3,908
Offsite, ft2:
0
Total Impervious Surfaces, ftz:
3,256
Basin Depth, feet:
2.2
ITSS removal efficiency:
85%
Bottom Elevation, FMSL:
6.0
Permitted Surface Area at bottom, ftz:
112
Permitted Storage Volume, ft3:
271
Temporary Storage Elevation, FMSL:
8.2 (Top of riser)
Type of Soil:
Historic Fill
Seasonal High Water Table Elevation:
2 FMSL
Expected Infiltration Rate:
l" per hour
Time to draw down:
1.2 days (must be less than 5 days)
IA vegetated filter is not feasible due to the location of the outlet under the deck. No vegetation
will grow in complete shadow, per CAMA.
3

State Stormwater Management Systems
Permit No. S W 8 020422
11. SCHEDULE OF COMPLIANCE
The stormwater management system shall be constructed in it's entirety, vegetated and
operational for its intended use prior to the construction of any built -upon surface.
2. During construction, erosion shall be kept to a minimum and any eroded areas of the
system will be repaired immediately.
The permittee shall at all times provide the operation and maintenance necessary to
assure the permitted stormwater system functions at optimum efficiency. The approved
Operation and Maintenance Plan must be followed in its entirety and maintenance must
occur at the scheduled intervals including, but not limited to:
a. Semiannual scheduled inspections (every 6 months).
b. Sediment rernoval.
e. Mowing and revegetation of slopes and the vegetated filter.
d. Immediate repair of eroded areas.
e. Maintenance of all slopes in accordance with approved plans and specifications.
f Debris removal and unclogging of outlet structure, orifice device, flow spreader,
catch basins and piping.
g. Access to the outlet structure must be available at all times.
4. Records of maintenance activities must be kept and made available upon request to
authorized personnel of DWQ. The records will indicate the date, activity, name of
person performing the work and what actions were taken.
Decorative spray fountains will not be allowed in the stormwater treatment system.
6. The facilities shall be constructed as shown on the approved plans. This permit shall
become voidable unless the facilities are constructed in accordance with the conditions of
this permit, the approved plans and specifications, and other supporting data.
7. Upon completion of construction, prior to issuance of a Certificate of Occupancy, and
prior to operation of this permitted facility, a certification must be received from an
appropriate designer for the system installed certifying that the permitted facility has been
installed in accordance with this permit, the approved plans and specifications, and other
supporting documentation. Any deviations from the approved plans and specifications
must be noted on the Certification. A modification may be required for those deviations.
8. If the stormwater system was used as an Erosion Control device, it must be restored to
design condition prior to operation as a stormwater treatment device, and prior to
occupancy of the facility.
9. The permittee shall submit to the Director and shall have received approval for revised
plans, specifications, and calculations prior to construction, for any modification to the
approved plans, including, but not limited to, those listed below:
a. Any revision to any item shown on the approved plans, including the stormwater
management measures, built -upon area, details, etc.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built -upon area or to the drainage
area.
C. Further subdivision, acquisition, or sale of the project area. The project area is
defined as all property owned by the permittee, for which Sedimentation and
Erosion Control Plan approval or a CAMA Major permit was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the
approved plan.
4

State.Stormwater Management Systems
Permit No. SW8 020422
10. The permittee shall submit final site layout and grading plans for any permitted future
areas shown on the approved plans, prior to construction. If the proposed BUA exceeds
the amount permitted under this permit, a modification to the permit must be submitted
and approved prior to construction.
11. A copy of the approved plans and specifications shall be maintained on file by the
Permittee for a minimum of ten years from the date of the completion of construction.
12. Prior to the sale or lease of any portion of the property, the permitter shall notify DWQ
and provide the name, mailing address and phone number of the purchaser or leasee. An
access/maintenance easement to the stormwater facilities shall be granted in favor of the
permittee if access to the stormwater facilities will be restricted by the sale or lease of any
portion of the property.
13. The permittee must maintain compliance with the proposed built -upon area and ensure
that the runoff from all the built -upon is directed into the permitted system.
14, The Director may notify the permittee when the permitted site does not meet one or more
of the minimum requirements of the permit. Within the time frame specified in the notice,
the permittee shall submit a written time schedule to the Director for modifying the site to
meet minimum requirements. The permittee shall provide copies of revised plans and
certification in writing to the Director that the changes have been made.
15. The permittee must maintain the current permitted drainage area. No additional runoff
from outside of the permitted drainage area boundary may enter the stormwater facilities
without first applying for and receiving a permit modification.
Ill. GENERAL CONDITIONS
This permit is not transferable. In the event there is a desire for the facilities to change
ownership, or there is a name change of the Permittee, a formal permit transfer request
must be submitted to the Division of Water Quality. Additionally, documentation from
the parties involved such as an operation and maintenance plan, and other supporting
materials as may be appropriate, must be submitted. The approval of this request will be
considered on its merits and may or may not be approved. The permittee is responsible
for compliance with all permit conditions until such time as the Division approves the
transfer request.
2. Failure to abide by the conditions and limitations contained in this permit may'subject the
Permittee to enforcement action by the Division of Water Quality, in accordance with
North Carolina General Statute 143-215.6A to 143-215.6C.
3. The issuance of this permit does not preclude the Permittee from complying with any and
all statutes, rules, regulations, or ordinances which may be imposed by other government
agencies (local, state, and federal) which have jurisdiction.
4. In the event that the facilities fail to perform satisfactorily, including the creation of
nuisance conditions, the Permittec shall take immediate corrective action, including those
as may be required by this Division, such as the construction of additional or replacement
stormwater management systems.
5. The permittee grants DENR Staff permission to enter the property during normal
business hours for the purpose of inspecting all components of the permitted stormwater
management facility.
6. The permit may be modified, revoked and reissued or terminated for cause. The filing of
a request for a pen -nit modification, revocation and reissuance or termination does not
stay any permit condition.
5

State Stormwater Management Systems
Permit No. S W 8 020422
7. Unless specified elsewhere, permanent seeding requirements for the stormwater control
must follow the guidelines established in the North Carolina Erosion and Sediment
Control Planning and Design Manual.
8. Approved plans and specifications for this project are incorporated by reference and are
enforceable parts of the permit.
9. The permittee shall notify the Division any name, ownership or mailing address changes
within 30 days.
Permit issued this the 14th day of April, 2003.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Alan W. Klimek, P.E., Director
Division of Water Quality
By Authority of the Environmental Management Commission

r%
OF
��
Date: March 14, 2003
To: Join Klein, P.E.
Company: Tripp Engineering
FAX #: [phone]
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
FAX COVER SHEET
DWQ Stormwater Project Number: SW8 020422
Project Name: 128 S. Water Street
MESSAGE:
John:
Alan W. Klimek, P.E., Director
Division of Water Quality
Wilmington Regional Office
No. of Pages: 1
From: Linda Lewis Op
Water Quality Section - Stormwater
FAX # [phone]
Phone # [phone]
I disagree with you about the vegetated filter. The building is ABOVE the ground, so how does
the siting of a vegetated filter on the ground below affect the size of the building? It appears that
the site will be graded so that the area from the mean high water line is sloped up to the existing
foundation wall, and the 8" outlet from the infiltration area is proposed to lie on top of the
ground.
Based on the section view through the infiltration vault, it appears that all you need to do is cut
off the 8" outflow pipe just beyond the existing foundation wall, install a flow spreader to
prevent erosion, and allow the overflow to simply sheet flow over the sloped area under the
building into the river. I see no proposed bulkhead to impede flow. While 30' may not be
achieved, it's better than nothing, and is a practicable idea for this redevelopment project.
S: WQSISTORMWATIADDINF0120031020422.MAR03
Ay
NCDENIR
N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 [phone] Fax [phone] Customer Service
800-623-7748

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GRANITE CURB
c�ni iTrt WATER 5TREEI

TRANSACTION REPORT
MAR-14-2003 FRI 05:12 PM
FOR: NCDENR WIRO 9103502004
SEND(M)
DATE START RECEIVER PAGES TIME NOTE M# :K
MAR-14 05:11 PM 97930599 1 48" 0 78

TRANSACTION REPORT
• MAR-14-2003 FRI 05:13 PM
FOR: NCDENR WIRO 9103502004
SEND(M)
DATE START RECEIVER PAGES TIME NOTE M#
MAR-14 05:12 PM 97930599 1 46" OK 79
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Wrightsville Engineering Services
March 5, 2003 File No.: 22009
Ms. Linda Lewis
NCDENR, Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405-3845 REC���E
Re: 128 South Water Street, Wilmington MAR 0 $ 2003
Project No.:'S1N8!b20422 BY:�
Dear Ms. Lewis:
Please find enclosed revised submission for the above referenced project. The
revisions involve reconfiguration of the infiltration vault to better suit the building
plans. Enclosed for your review are:
Revised copy of the Infiltration Basin Supplement Form
Two (2) copies of the revised Narrative which include Calculations
Two (2) copies of revised Drawings
With respect to fax dated 1-21-03 regarding a vegetative filter, both the client and
our office have reviewed the request. In our opinion, the project cannot be
modified to include a vegetative filter outlet. A vegetative .filter would require a
substantial reduction in building size to accommodate a filter of any significant
length due to the shallow lot depth.
Should there be any question or additional copies desired, please feel free to
contact our office.
Sincerely,
WRIgBISVILLE ENGINEERING SERVICES, PLLC
HN K. KLEIN, PE
Enclosures
Cc: Mr. George K. Coffin
3410 Wrightsville Avenue Wilmington, North Carolina 28403 910.799.7967 Fax [phone]

Rev�� 3-S-o3
DESIGN NARRATIVE
AND
DRAINAGE CALCULATIONS
for
128 SOUTH WATER STREET
WILMINGTON
NEW HANOVER COUNTY, NORTH CAROLINA
PREPARED FOR
George K. Coffin
1920 Highway 54, Suite 510
Durham, NC 27713
[phone] RECEIVED
November 2002
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PREPARED BY
MAR 0 6 2003
PROJ # t`j ZCj q-Z 2
WRIGHTSVILLE ENGINEERING SERVICES, P.L.L.C.
3410 Wrightsville Avenue
Wilmington, NC 28403
[phone]

DESIGN NARRATIVE
9. GENERAL:
The purpose of this submittal is to present design of the stormwater management measures for the
subject site. Included within this submittal are the Drawings and Storm Drainage Calculations. All
items are part of the overall plan and included by reference.
This submittal involves the construction of an 89.33' by 37.33' building over an existing developed site
with stormwater handled within a subsurface recharge system. This project is designed to meet the
redevelopment requirements of the NCDENR Division of Water Quality.
2. EXISTING SITE:
The existing site is comprised of an existing concrete slab over historical fill material. Ground cover
consists of local grasses with rip -rap and rubble used to stabilize the current shoreline. Drainage is
from an east to west direction toward the Cape Fear River.
The site falls within the drainage boundary of the Cape Fear River classified as SC.
3. PROPOSED IMPROVEMENTS:
As indicated, this project involves construction of a pile supported 3335 square foot (SF) footprint on the
existing site. Also, decking will be provided along the western side of the building along the Cape Fear
River with steps leading to the future Riverwaik project being developed by the City of Wilmington. An
additional deck along the northern side of the building will permit side access to the building for service
needs.
Drainage will be handled via an infiltration basin system sized to convey the first 1-inch runoff from the
roof collection system. An overflow has been provided once the design storage has been satisfied.
The overflow will be extended below mean low water (MLW) within the Cape Fear River.
4. DRAINAGE CONSIDERATIONS:
The site is located in an area of historical fill. Originally the proposal was for underground infiltration;
however, in review, the soils report, above ground storage was decided. The storage basin has been
designed to operate above the seasonal high water table within historical fill and therefore does not
meet the two (2) feet minimum of native soil separation requirements of DWQ. The design provides for
storage within the basin and gravel bed, however, storage within the voids of the gravel was not
considered within the design. Overflow from the system is allowed only after the design storage levels
have been reached.
Refer to the Drawings and enclosed calculations for other design considerations.

Wrightsville Engineering Services, PLLC
PROJECT: 128 South Water Street PROJECT NO.: 22009
CLIENT: George K. Coffin DATE: November 2002
LOCATION: Wilmington, North Carolina PREPARED BY: JKK
RECHARGE TRENCH CALCULATIONS (Revised 3-S-03)
Design a subsurface disposal system for stormwater generated
from the proposed new construction.
1. GIVEN:
Design storagevault to store the first 1-inch of runoff for disposal within
the system.
Impervious Area (building):
37.33 FT x 89.33 FT = 3335 SF
3335 SF x 1'712" = 277.9 CF
a. Storage within vault:
Interior Surface Area: 206.6 SF
Storage capacity: 206.6 CF/FT
use: 13 " depth ( 1.08 ' )
Available storage = 206.6 SF x 1.08 FT = 223.8 CF
b. Storage within gravel: use: 40 % void ratio
interior Surface Area: 206.6 SF
Storage capacity: 208.6 CF/FT
use: 8 " depth ( 0.67 ' )
Available storage =
206.6 SF x 0.67 FT x 0.40 = 55.1 CF
Total storage provided = 223.8 CF + 55.1 CF = 278.9 CF ( > 277.9 CF )
2. TIME REQUIRED TO DRAIN:
minimum estimated permeability (see report): 1.0 in/hr or
0.083 CFmrISF
bottom surface area of trench: 206.6 SF(note: area deducted for wall footers)
total infiltration rate of trench: 17,22 CF/hr
total time to infiltrate 277.9 CF = 16.1 hrs
3. OVERFLOW DESIGN:
a. General
Design Storm Return period: 10 year
Runoff Coefficients:
Imperv. - 1.00
Drainage Areas:
Imperv. - 3335 SF or 0.08 Acres
b. Rainfall Rate based on Duration for given return period: Use
Duration: 5 min. Intensity: 7.23 in.ft
c. Runoff generated determined by:
Q=CxixA
where: R = Flow Rate in cfs
C = Runoff Coeff, = 1.00
i = intensity (in.lhr) = 7.23
A = Area (Acres) = 0.08
Therefore, Q = 0.55 CFS
d. Piping design:
Note piping based on n = 0.012
use: 8" PVC
Required Slope = 0.001786 f /ft or
0.179 %
for design, use a minimum slope of 1.00 %
1 22009 - 128 South Water Street

CHART E-5
.�_. Depth - Duration - Frequency Table
Location: Wilmington, NC
Return Period
- - -
Duration
2-yr
5-yr
10-yr
25-yr
50-yr
100-yr
in
is
(ml
(n]
[in]
[m]
5 ruin
0.49
0.55
0.60
0.68
0,74
0.80
10 min
0.84
0.96
1,05
1.19
1.30
1.41
15 min
1.09
1.24
1.36
1,54
1.69
1.83
30 min
1.58
1.90
2.12
2.46
2.72
2.98
60 man
2.10
2.58
2.92
. 3.41
3.80
4.18
2 hr
2.36
2.93
3.34
3.92
4.37
4.82
3 hr
2.63
3,29
3.76
4.42
4.94
5.46
6 hr
3.30
4.20
4.92
5.71
6.40
7.09
12 hr
3.90
5.00
5.77
6.96
7.70
8.55
24 hr
4.50
5,81
6.72
9.01
9.01
10.00
CHART E-6
Intensity - Duration - Frequency Table
Location: Wilmington, NC
Return Period
Duration 2-yr 5-yr 10-yr 25-yr 50-yr 100-yr
[in/hr] [irArl f ilL rL_ (ia/hr} [in� [in/hr
5 min
5.89
6.63
7.23
8.15
8.97
9.60
10 min
5.06
5.76
6.30
7.13
7.79
8.45
15 min
4.36
4.97
5.45
6.17
6.75
7.32
30 min
3.17
3.79
4.25
4.92
5.44
5.96
60 min
2.10
2.58
2.92
3.41
3.80
4.18
2 hr
1.19
1.47
1.67
1.96
2.19
2.41
3 hr
0.98
1.10
1.25
1.47
1.65
1.82
6 hr
0.55
0.70
0.80
0.95
1,07
1.18
12 hr
0.33
0.42
0.48
0,57
0.64
0.71
24 hr
0,19
0.24
0.28
0.33
0.39
0.42
*Source: Mastor Drainage hwrovernew and Stormwater Management Plan, Vol. 1, McKim dt
Craed, Tune 1988
5-15

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DATE: May 31, 2002
SPA ;f4
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3803 IW"k4&0d4 ,W.
SUBJECT: Land & soils evaluation of the 128 South Water Street Project for re -development
with stormwater infiltration treatment usage. Project located at 128 South Water
Street, on the western side of Water Street and the Cape Fear River, western
Wilmington area, New Hanover County, North Carolina.
TO: Mr. George K. Coffin, PE, PhD
GKC Associates
1920 Hwy 54, Suite 510
Durham, NC 27713 [phone] [o]; 544-0173 [fx]
cc: Mr. John Klein, PE
The land & soils within the 128 South Water Street Re -Development Project were evaluated to
determine potential suitability for stormwater infiltration treatment usage. Land Management
Group was requested to evaluate the technical issues of soil types, estimated long-term seasonal
high water table levels, and estimated permeability rates. NCDENR-DWQ "Stormwater Runoff
Disposal" rules and regulations (NCAC 15-2H-.1000) were used as guidelines in making this
evaluation. The proposed project is re -development of a site that has historically existing
impervious concrete cover over most of the area (>95%). Our understanding is the City of
Wilmington is requesting the applicant to investigate any possibilities for stormwater infiltration
treatment during this re -development even though much of the area is historically covered with
impervious materials.
The current "land" area within this tract above mean high water is --0.08 acre. The elevation
appears to be 3.0 - 3.5 ft above mean high water. The current re -development plans will not
increase the current impervious surface area historically existing. The tract drains to the Cape
Fear River which is classified as "SC" Waters. Our understanding is this project will utilize
infiltration basins as much as feasible. Principle soil and site requirements for an infiltration
system are: ---the infiltration system's bottom relative to the seasonal high static water table;
---time and ability for complete draw -down; —the soil's hydraulic conductivity.
The project site is on nearly level topography (0 -1 % slopes), situated at the based of a sand ridge
escarpment, and before a 3.0 - 3.5 ft elevation drop to the adjacent Cape Fear River. The site is
almost completely covered with a historically existing impervious foundation pad of concrete.
Thus, soil boring evaluations to the underlying materials were limited to 3 borings and visual
observations along the shoreline cut. All observed materials beneath the concrete pad appears
to be historic fill of loamy sand incorporated with-30-50% rubble of broken brick, concrete, glass,
and metal materials. The historic fill material is -3.5 to 4.0 ft thick, where buried natural marsh
soils are typically encountered. The slope to the river is historically existing rip -rap consisting
Page 1 of

primarily of broken concrete and brick materials. The enclosed land & soil map of the respective
area evaluated show the various land/soil types found (see map). Seasonal high water table level
was determined by general drainage guidelines, as field evaluations of redoximorphic soil
indicators was not possible due to the various man-made fill materials. Permeability was
determined and estimated through field evaluation of soil structure and texture. Detailed soil
boring descriptions can be provided upon request. The following are brief descriptions of the
respective soil areas found for stormwater infiltration usage.
"Yellow Areas" (see map) are usable historic fill soils for re -development with shallow stormwater
infiltration basins (<1.5 ft into existing ground surface). Surface elevations are --3.0 - 3.5 ft above
mean high water levels. Estimated seasonal high static water table is +1.5 ft (eastern) - 2.0 ft
(western) below existing ground surface, pending location and based upon general drainage
guidelines. Estimated permeability is 1.0 - 2.0 inlhr to -r4 ft depths, based upon soil texture and
structure. Soils type found is historic fill materials of loamy sand with 30-50% rubble content.
These soil areas are suited for infiltration stormwater treatment usage for shallow infiltration basins
with bottoms <1.5 ft into the present ground surface, to provide a minimal separation from the
seasonal high static water table. It is recommended the existing historic fill be removed to —4.0
ft depths, back -filled with clean medium - coarse sands (1.0-3.0 mm). Shallow placed perforated
pipe or infiltrator panels with filter cloth bottoms could be used as infiltration structures. An over-
flow weir or port should be provided for the stormwater volumes in excess of the design infiltration
volume.
"Gray Areas" (see map) are historic rip -rap materials of broken concrete, brick, glass, and metal
materials. These areas are unusable for stormwater infiltration due to shallow seasonal high static
water table 0 - <1.5 ft from existing ground surface, and historic fill rubble >60-100%.
"Blue" Areas (see map) are the open waters of the Cape Fear River below the mean high water
line.
This report and map should be used for general planning and engineering design purposes. The
usable areas found should meet minimum design standards for re -development with stormwater
infiltration usage, but will not meet or exceed typical NCDENR-DWQ'S standards for stormwater
infiltration design and construction.
Larry F. Baldwin, CPSS/SC
ARCPACS #2183; NCLSS #1040
Page 2 of

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GENERAL LAND ,& SOILS MAP OF THE 128 SOUTH WATER STREET PROJECT FOR STORMWATER INFILTRATION TREATMENT REDEVELOPMENT USAGE
West Wilmington Area - New Hanover County - North Carolina
T
Usable historic fill soils for re -development usage with
shallow stormwater infiltration basins (<1,5 ft into
existing surface). Surface elevations-3.0-3.5 ft amsl.
Est seasonal high static water table +1.5-2.0 ft from
existing surface pending location, based upon general
drainage guidelines. Estimated permeability
1.0 - 2.0 inthr, based upon soil texture & structure.
Historic loamy sand fill materials with 30-50% rubble.
Unusable areas for stormwater infiltration usage due to
shallow seasonal high static water table 0 - <1.5 ft from
existing surface, or historic fill rubble >60-100%. Historic
rubble of concrete, brick, glass, and metal materials.
Open waters of the Cape Fear River. Upper limit is
the mean high tide line.
;Won-..UNE
SCALE: 1 Inch = 20 Feet
(all soil lines approx & limited access)
MAY - 2002
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P. 1
FILE MODE OPTION
977 ME4ORY TX
COMMUNICATION RESULT REPORT ( JAN.21.2003 10:17AM )
TTI NCDENR WIRO
-
ADDRESS (GROUP)RESULT---- ----PAGE--
-------------------�------------------------
-------
9-7930599 OK P . 1/1
----------------------------------
REASON FOR ERROR
E-1) HANG UP OR LINE FAIL
E-3) NO ANSWER
"O G
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E-2) BUSY
E-a) NO FACSIMILE CONNECTION
Michael F. Easley, Governor
William G. Ross, Jr. Secretary
North Carolina Department of Envlronment and Natural F esources
Alan W. Klimek RE., Director
Division of Water Quality
Wilmington Regional Office
FAX COVER. SHEET
Date: January 21, ;003
To: John Klein,.E.
Company: Wrig t ville Engineering Services
FAX #: 793-0 99
DWQ Stormwater Project Number: SWs 020422
Project Name: 128 South Water Street
MESSAGE -
Dear John:
No. of Pages : 1
from; Linda Lewis
Water Quality Section -
$tormwater
FAX # [phone]
Phone # [phone]
Please provide a 30' Vegetated filter at the outlet of the infiltration system. Piping the overflow
directly froni the out] t to the receiving stream is not allowed.
Please add a vegetate filter detail to the plans.

4
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
FAX COVER SHEET
Date: January 21, 2003
To: John Klein, P.E.
Company: Wrightsville Engineering Services
FAX #: [phone]
DWQ Stormwater Project Number: SW8 020422
Project Name: 128 South Water Street
MESSAGE:
Dear John:
Alan W. Klimek, P.E., Director
Division of Water Quality
Wilmington Regional Office
No. of Pages: 1
From: Linda Lewis
Water Quality Section -
Stormwater
FAX # 910-350=2004
Phone # [phone]
Please provide a 30' vegetated filter at the outlet of the infiltration system. Piping the overflow
directly from the outlet to the receiving stream is not allowed.
Please add a vegetated filter detail to the plans.
I
S:\WQS\STORMWAT\ADDINFO\2003\020422.JAN03
NCDENR
N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 [phone] Fax [phone] Customer Service
800-623-7748

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Wdmingem, ,/roA Vatdma .48402
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DATE: May 31, 2002
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VdMIftR&n, ✓{`B 2840.1
SUBJECT: Land & soils evaluation of the 128 South Water Street Project for re -development
with stormwater infiltration treatment usage. Project located at 128 South Water
Street, on the western side of Water Street and the Cape Fear River, western
Wilmington area, New Hanover County, North Carolina.
TO: Mr, George K. Coffin, PE, PhD
GKC Associates
1920 Hwy 54, Suite 510
Durham, NC 27713 [phone] [o]; 544-0173 [fx]
cc: Mr. John Klein, PE
The land & soils within the 128 South Water Street Re -Development Project were evaluated to
determine potential suitability for stormwater infiltration treatment usage. Land Management
Group was requested to evaluate the technical issues of soil types, estimated long-term seasonal
high water table levels, and estimated permeability rates. NCDENR-DWQ "Stormwater Runoff
Disposal" rules and regulations (NCAC 15-2H-.1000) were used as guidelines in making this
evaluation. The proposed project is re -development of a site that has historically existing
impervious concrete cover over most of the area (>95%). Our understanding is the City of
Wilmington is requesting the applicant to investigate any possibilities for stormwater infiltration
treatment during this re -development even though much of the area is historically covered with
impervious materials.
The current "land" area within this tract above mean high water is —0.08 acre. The elevation
appears to be 3.0 - 3.5 ft above mean high water. The current re -development plans will not
increase the current impervious surface area historically existing. The tract drains to the Cape
Fear River which is classified as "SC" Waters. Our understanding is this project will utilize
infiltration basins as much as feasible. Principle soil and site requirements for an infiltration
system are: ---the infiltration system's bottom relative to the seasonal high static water table;
—time and ability for complete draw -down; —the soil's hydraulic conductivity.
The project site is on nearly level topography (0 -1 % slopes), situated at the based of a sand ridge
escarpment, and before a 3.0 - 3.5 ft elevation drop to the adjacent Cape Fear River. The site is
almost completely covered with a historically existing impervious foundation pad of concrete.
Thus, soil boring evaluations to the underlying materials were limited to 3 borings and visual
observations along the shoreline cut. All observed materials beneath the concrete pad appears
to be historic fill of loamy sand incorporated with--30-50% rubble of broken brick, concrete, glass,
and metal materials. The historic fill material is —3.5 to 4.0 ft thick, where buried natural marsh
soils are typically encountered. The slope to the river is historically existing rip -rap consisting
Page 1. of

primarily of broken concrete and brick materials. The enclosed land & soil map of the respective
area evaluated show the various land/soil types found (see map). Seasonal high water table level
was determined by general drainage guidelines, as field evaluations of redoximorphic soil
indicators was not possible due to the various man-made fill materials. Permeability was
determined and estimated through field evaluation of soil structure and texture. Detailed soil
boring descriptions can be provided upon request. The following are brief descriptions of the
respective soil areas found for stormwater infiltration usage.
"Yellow Areas" (see map) are usable historicfill soils for re -development with shallow stormwater
infiltration basins (<1.5 ft into existing ground surface). Surface elevations are -3.0 - 3.5 ft above
mean high water levels. Estimated seasonal high static water table is +1.5 ft (eastern) - 2.0 ft
(western) below existing ground surface, pending location and based upon general drainage
guidelines. Estimated permeability is 1.0 - 2.0 inlhr to -4 ft depths, based upon soil texture and
structure. Soils type found is historic fill materials of loamy sand with 30-50% rubble content.
These soil areas are suited for infiltration stormwater treatment usage for shallow infiltration basins
with bottoms <1.5 ft into the present ground surface, to provide a minimal separation from the
seasonal high static water table. It is recommended the existing historic fill be removed to -4.0
ft depths, back -filled with clean medium - coarse sands (1.0-3.0 mm). Shallow placed perforated
pipe or infiltrator panels with filter cloth bottoms could be used as infiltration structures. An over-
flow weir or port should be provided forthe stormwater volumes in excess of the design infiltration
volume.
"Gray Areas" (see map) are historic rip -rap materials of broken concrete, brick, glass, and metal
materials. These areas are unusable for stormwater infiltration due to shallow seasonal high static
water table 0 - <1.5 ft from existing ground surface, and historic fill rubble >60-100%.
"Blue" Areas (see map) are the open waters of the Cape Fear River below the mean high water
line.
This report and map should be used for general planning and engineering design purposes. The
usable areas found should meet minimum design standards for re -development with stormwater
infiltration usage, but will not meet or exceed typical NCDENR-DWQ'S standards for stormwater
infiltration design and construction.
Lary F. Baldwin, CPSS/SC
ARCPACS #2183; NCLSS #1040
Page 2 of

v 05/24/02 13:00 TEL [phone] GRC ASSOCIATES a 03
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GENERAL LAND & SOILS MAP OF THE 128 SOUTH WATER STREET PROJECT FOR STORMWATER INFILTRATION TREATMENT REDEVELOPMENT USAGE
West Wilmington Area - New Hanover County - North Carolina
SOUTH WATER STREET
Usable historic fill soils for re -development usage with
shallow stormwater infiltration basins (<1.5 ft into
existing surface). Surface elevations—3.0-3.5 ft amsf.
Est seasonal high static water table +1.5-2.0 ft from
existing surface pending location, based upon genera
drainage guidelines. Estimated permeability
1.0 - 2.0 inthr, based upon soil texture & structure.
Historic loamy sand fill materials with 30-50% rubble.
Unusable areas for stormwater infiltration usage due t
shallow seasonal high static water table 0 - <1.5 ft froi
existing surface, or historic fill rubble >60-100%. Histi
rubble of concrete, brick, glass, and metal materials.
Open waters of the Cape Fear River. Upper limit is
the mean high tide line:
SCALE: 1 Inch = 20 Feet
(ail soil lines approx & limited access)
MAY - 2002
r,.
Land Management Group, Inc.

V fV I Jgl; fsville Engineering Services
r v i i
November 5, 2002
Ms. Linda Lewis
NCDENR, Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405-3845
Re: 128 South Water Street, Wilmington
Redevelopment Submittal
Dear Ms. Lewis:
File No.: 22009
E
Nov - 6 Z04Z
On behalf of Mr. George K. Coffin, please find enclosed submittal for DWQ V
stormwater approval. Enclosed for your review are:
Original and one (1) copy of the Stormwater Application Form
Original copy of the Infiltration Basin Supplement Form
Permit application fee in the amount of $420
Two (2) copies of the Narrative which includes Calculations
Two (2) copies of Drawings
Should there be any question or additional copies desired, please feel free to
contact our office.
Sincerely,
WRIGHTSVILLE ENGINEERING SERVICES, PLLC
JOHN K. KLEIN, PE
Enclosures
Cc: Mr. George K. Coffin
CY0
3410 Wrightsville Avenue Wilmington, North Carolina 28403 910.799.7967 Fax [phone]

�CF W arF9Q.
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Michael F. Easley, Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
April 23, 2002
CERTIFIED MAIL 97002 0460 0000 4340 3641
RETURN RECEIPT REQUESTED
Mr. George K. Coffin
1920 Hwy 54, Suite 510
Durham, NC 27713
Dear Mr. Coffin:
Gregory J. Thorpe, Rh.D., Acting Director
Division', of Water Quality
Wilmington Regional Office
Subject: REQUEST FOR STORMWATER
MANAGEMENT PERMIT APPLICATION
128 South Water Street Deck & Dock
Storrnwater Project No. SW8020422
New Hanover County
On April 17, 2002, the Wilmington Regional Office received a copy of a CAMA Application for 128 South
Water Street" The North Carolina Administrative Code requires any project that must receive either Sedimentation
and Erosion Control Plan approval and/or a CAMA Major permit to apply for and receive a Stormwater
Management Permit by the Division of Water Quality. Any construction on the subject site, prior to receipt of the
required permit, will constitute a violation of 15A NCAC 2H.1000 and may result in appropriate enforcement action
by this Office.
Either a Storrnwater Permit Application Package including 2 sets of plans, completed application form,
fee, and supporting documentation, or a written response regarding the status of this project and the expected
submittal date must be received in this Office no later than May 23, 2002. Failure to respond to this request may
result in the initiation of enforcement action, and construction may experience a subsequent delay,
The NPDES 010000 Federal'.Stormwater Permit that accompanies the Erosion Control Plan approval letter
must NOT be considered the Coastal Storrnwater Management Permit, which will be signed by the Water Quality
Supervisor. Please reference the Project Number above on all correspondence. Ifyou have any questions, please
call me at (910)-395-3900.
Sincerely,
'Linda Lewis
Environmental
Engineer
RSS/arl: S:1WQSISTORMWATISTORMSUB1020422.Apr
cc: Tony Roberts, New Hanover County Building Inspections
Ed Brooks
Cl jnda Lt, w— is-1
Central Files
David Mayes, P.E. City of Wilmington
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N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405
[phone] Fax (910) 35D-2004
Customer Service
800-623-7748

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Permit No.-G--10....,,,E
State of North Carolina
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Wilmington, N%- 28405 (Attn: Bev)
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item 4 if Restricted Delivery is desired.
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so that we can return the card to you.
■ Attach this card to the back of the mailpiece,
or on the front if space permits.
1. Article Addressed to:
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❑ Insured Mail ❑ C.O.D.
4. Restricted Delivery? (Extra Fee) ❑ Yes
0000 4340 3641
PO, Fnrm 3811 . August 2001 Domestic Return Receipt 102595-42•M-08351

Re: Redevelopment Options
Subject: Re: Redevelopment Options
Date: Fri, 11 Oct 2002 10:27:11 -0400
From: Linda Lewis <[e-mail]>
Organization: NC DENR
To: John Klein <[e-mail]>
John:
The Stormceptor is approved for use only on about 5 sites in the 20 coastal
counties. Right now, they are still being evaluated for more wide -spread use as
a treatment option. Both Washington and Wilmington have two or three sites where
Stormceptor is being used. Preliminary data indicates that it does not provide a
consistent level of TSS removal that is anywhere near"85%. We will not be
approving any more projects which use Stormceptors in the near future.
Additionally, those types of treatments (canned wetlands) are generally reserved
for "after -the -fact" projects, where no stormwater treatment had originally been
planned.
The amount of clearance available under the building is a judgement call. If you
and the permittee think adequate access can be obtained to inspect and maintain,
I have no problem, but, 44" doesn't sound like it will be enough when the time
comes to maintain the system. It is especially unappealing to me since I'll have
to crawl under aidark building to inspect it- the State may not allow me to put
my life at risk in such a manner.
Linda
John Klein wrote:
> October 11, 2002
> Re: 128 South Water Street
> What about the question regarding the use of the Stormceptor System by CSR?
> This device is a,self-contained underground structure which is stated to
> remove 90t TSS prior to discharge. Four our case, the size of the device is
> a large manhole -type underground structure and the discharge would be back
> into the river. I've been told by the local dealer that they have been used
> before but primarily for pretreatment needs. If you need info on this type
> of system, let me know, I'll forward documents to your office.
> Regarding work under the proposed building, the clearance is approximatley
> 44" from the underside of the metal deck to the ground level.
> Thanks,
> John K. Klein, PE
> Wrightsville Engineering Services, PLLC
1 of 1 10/11/2002 10:27 AM

George K. Coffin, PE, PhD
1920 Highway 54, Suite 510 • Durham, North Carolina 27713 • Email [e-mail] . Fax [phone] • Voice 919.544.6436
�.
May 31, 2002
Ms. Linda Lewis ip
Environmental Engineer O
Division of Water Quality
North Carolina Department of Environment and Natural Resources
127 Cardinal Drive Extension
Wilmington, NC 28405
Re: a
W;0020422
12uth Water Street Project
Wilmington, NC
Dear Ms. Lewis:
Via US Mail
thank you for your prompt and informative letter of May 8, 2002. Yes, I was confusing the CAMA rules,
administered by the Division of Coastal Management, with the State Stormwater Management rules,
administered by the Division of Water Quality. Most of the content of my May 6, 2002 letter to you should
been addressed to Mr. Stroud with the Division of Coastal Management.
With respect to the third paragraph of your letter, there will not be any construction work on the property
until all required permits issued.
have asked Mr. John Klein, P.E., see attached copy of my May 24, 2002, for a proposal to prepare a
State Stormwater Management Permit Application package. He as indicated via telephone that he is going
to send me a proposal, but I have not received one as of this date.
Sincerely,
. C�.a
George Coffin
copy: Mr. C. Robert Stroud, Jr., District Manager, Division of Coastal Management

r
.8 �,,. ..� 'L..

J I •-
George K. Coffin, PE, PhD
1920 Highway 54, Suite 510 . Durham, North Carolina 27713 • Email [e-mail] . Fax [phone] • Voice 919,544,6436
May 24, 2002 Via Fax [phone]
Mr. John Klein
Wrightsville Engineering Services (910.799.7967)
Re: 128 South Water Street Project
Wilmington, NC
John,
Now that you have a good idea of the scope of the project, please send me a proposal to:
1. Have a meeting with me to critique stormwater management design options.
2. Design a stormwater management system for this project.
3. Prepare a stormwater management permit application package for submittal to
the North Carolina Department of Environment and Natural Resources, Division
of Water Quality.
i would like to work with you at hourly rates with a guaranteed not to exceed maximum fee.
So I can let Linda Lewis know, please indicate the time to completion your work after I furnish you
with a report on site conditions by a soils scientist.
Thanks,
George

w
e
I

of
W A rF9
QG
Mr. George K. Coffin
1920 Highway 54, Suite 510
Durham, NC 27713
Dear Mr. Coffin:
Michael F. Easley, Governor
William G. Ross, Jr., Secretary
North Carolina Department of Environment and Natural Resources
Gregory J. Thorpe, Ph.D., Acting Director
Division of Water Quality
Wilmington Regional Office
May 8, 2002
Subject: 128 South Water Street Project
Stormwater Project No. SW8 020422
New Hanover County
Thank you for your letter of May 6, 2002. Based on the exclusive CAMA rule cites in your letter, it appears
that you are confusing the CAMA rules, administered by the Division of Coastal Management, with the State
Stormwater Management rules, administered by the Division of Water Quality. These are two separate agencies with
different requirements, both of which must be met. It may be that the Division of Coastal Management will issue
a CAMA permit for the project without a stormwater system, but the Division of Water Quality will not issue you
a stormwater permit unless you comply with the stormwater rules. The rules which provide stormwater design
requirements can be found under] 5A NCAC 2H.1000 (copy enclosed). Those rules describe who is subject, and
provides the design requirements for various projects including Low Density, High Density, Director's Certification,
General Permits, and Other Projects, which includes off -site, redevelopment, public roads, and water -dependent
projects. ;
A project is subject to NCAC 2H:1000 if it requires either a CAMA-Major permit or approval of a ,
Sedimentation Erosion Control Plan. On April 17, 2002, I received a copy of the CAMA Major Application for a
new restaurant, deck and dock, therefore the project is subject to the stormwater rules.'You have indicated that the
site is currently 100% impervious, therefore, you may choose the "Redevelopment" option, found under-1003
(d)(3)(B) of the stormwater rules. This rule requires a redevelopment project to:provide stormwater management
measures in accordance with the requirements of that Section, to the "maximum extent practicable." There appears
to be ample opportunity to provide stormwater management measures on this site.
As requested on April 23, 2002, please submit either a complete stormwater management permit application
-package (forms enclosed), or a written response regarding the expected date. of submittal, by May 23, .2002.
Construction of any built -upon area associated with the project prior to receipt of the Stormwater Permit or failing
to respond to this request are considered violations of the North Carolina General Statutes and are subject to
enforcement action.
NCDENit
N.C. Division of Water Quality 127 Cardinal Drive Extension Wilmington, N.C. 28405 [phone] Fax [phone] -Customer Service
800-623-7748

✓Ai:7
Mr. Coffin
May 8, 2002
Stormwater ARDlication No. SW8 020422
To further complicate things, I believe the City of Wilmington may also require some type of flood control
facilities, which will be another separate permit. If you have any questions, please do not hesitate to call me at (910)
395-3900.
Sincerely,
4eNr .ck)
Linda Lewis
Environmental Engineer
RSSlarl: S:IWQSISTORMWATILETTERS1020422.MAY
cc: Linda Lewis
Bob Stroud, Division of Coastal Management
David Mayes, P.E., City of Wilmington Development Services

George K. Coffin, PE, PhD
1920 Highway 54, Suite 510 . Durham, North Carolina 27713 . Email [e-mail] . Fax [phone] • Voice 919,544,6436
May 6, 2002
Ms. Linda Lewis
Environmental Engineer
Division of Water Quality
North Carolina Department of Environment and Natural Resources
127 Cardinal Drive Extension
Wilmington, NC 28405
Re: SW8020422
128 South Water Street Project
Wilmington, NC
Dear Ms. Lewis:
Hand Delivered 5/6/02
Please replace my May 3, 2002 letter to you with this letter. I have added comments on the extent of
the project deck waterward of the normal high water level.
I have received your April 23, 2002 letter by registered mail. I am assuming that you will be my
primary contact with the Division of Water Quality. The purpose of this letter is to let you know the
status of the project, and to identify certain elements of the project that are specific to the NC
Administration Code 15A7H.
Protect Status: Waiting for a State CAMA Permit.
Project Elements:
1. Urban Waterfront Project
2. Redevelopment Project
3. Site100 Percent Impervious
The project qualifies as an urban waterfront project in accordance with Rule 7H.0209(h)(1)(A) and (B),
considering:
1. The project is located on a waterfront area that is not adjacent to Outstanding
Resource Waters.
2. The project area lies wholly within the corporate limits of the City of Wilmington.
3. The project area is in the City of Wilmington's central business district with minimal
undeveloped land and mixed land uses.
4. The project is in an area with urban level services of city water, sewer, streets, solid
waste management, and police and fire protection.
The project qualifies as a redevelopment project because:
1. The City of Wilmington, in its Application for State Permit 148-98, has identified the
project site to be a part of the redevelopment of South Water Street.
2. In times past, a building was located on the project site. See photo on Sheet Number 3,
Attachment 3 in the project's CAMA Application.

May 6, 2002 Ms. Linda Lewis page 2
The project site qualifies as 100 percent impervious, taking into account:
1. The Field Investigation Report carried out by the Division of Coastal Management for
State Permit Number 149-98 considers the lot to be 100% impervious.
2. Foundation walls and a concrete floor slab from a prior building are existing on the site.
See photo on Sheet Number 3, Attachment 3 of the project's CAMA Application.
Assuming you agree that this is a Redevelopment Urban Waterfront project located on a 100 percent
impervious site, then-
1 . The buffer requirement of Rule 7H.0209(d)(10) is not required.
2. The 30 percent impervious surface limit of Rule 7H.0209(h)(4)(A)(ii) does not apply.
3. Rule 7H.0209(h)(4)(B)(iii) permits a non -water dependent, pile supported, single -story
deck over the water.
4. Rule 7H.0209(h)(4)(8)(iii) permits an unenclosed roof over the deck_
With respect to Rule 7H.0209(h)(4)(B)(I11), the project deck extends more than 20 feet waterward of
the normal high water level. I am requesting that the 20 feet waterward limit be increased for this
project because:
1. The City's State Permit Number 149-98 permits a deck at the project site that extends more
than 20 feet waterward of the normal high water level.
2. The City's State Permit Number 149-98 permits the City's Riverwalk and Pocket Parks to
extend more than 20 feet waterward of the normal high water level.
3. The project's deck is a replacement of a deck that existed in times past. See existing deck
pilings shown in photo on Sheet Number 4, Attachment 3 of the project's CAMA Application.
The exact extent of the existing pilings has not been surveyed. However, based on visual
observations from the deck at the Riverwalk Condominiums, it appears that the project's deck
will not extend as far waterward as the deck of times past. This is because the City's Riverwalk
will pass over part of the area of the old deck.
Concerning stormwater management, the project design improves runoff water quality because the
existing concrete slab on the property is currently being used for vehicular parking. A Storm Water
Management Permit may not be required for this project. For example, if a stormwater management
system is determined to be unfeasible to any extent, the project could be permitted in accordance with
Rule 7H.0209(h)(4)(A)(ii) without a stormwater management system.
am looking forward to an analysis of this letter by you and Mr. Stroud.
If you have any questions, please call me at you earliest convenience.
Sincerely,
)4a=_e�4 4-
George Coffin
copy: Mr. C. Robert Stroud, Jr., District Manager, Division of Coastal Management
GKC

` 1 �•4
George K. Coffin, PE, PhD
1920 Highway 54, Suite 510 Durham, North Carolina 27713 • Email [e-mail] • Fax [phone] Voice 919.544.6436
May 3, 2002
a n FN��i lip:
C • l MAY = �ry
?l 2Q� ,;.•!US Mail
Ms. Linda Lewisw,}„�
Environmental Engineer ------
-�_. ;.
North Carolina Department of Environment and Natural Resources
Division of Water Quality
127 Cardinal Drive Extension
Wilmington, NC 28405
Re: SW8020422
128 South Water Street Project
Wilmington, NC
Dear Ms. Lewis:
I received your April 23, 2002 letter on Wednesday of this week. I am assuming the you will be my
primary contact with the Division of Water Quality. The purpose of this letter is to let you know the
status of the project; and to identify certain elements of the project that are specific to the NC
Administration Code 15A7H.
Project Status: Waiting for a State CAMA Permit.
Project Elements:
1. Urban waterfront project.
2. Redevelopment project.
3. Site 100 percent impervious.
The project qualifies as an urban waterfront project in accordance with Rule 7H.0209(h)(1)(A) and (B),
considering:
1. The project is located on a waterfront area that is not adjacent to Outstanding
Resource Waters.
2. The project area lies wholly within the corporate limits of the City of Wilmington.
3. The project area is in the City of Wilmington's central business district with minimal
undeveloped land and mixed land uses.
4. The project is in an area with that has urban level services of city water, sewer, streets,
solid waste management, police and fire protection.
The project qualifies as a redevelopment project because:
1. City of Wilmington has identified the project site as part of the redevelopment of South
Water Street in its Application for State Permit 148-98,
2. In times past, a building was located on the project site; see Sheet Number 3,
Attachment 3 in the project's CAMA Application.

May 3, 2002 Ms. Lewis page 2
The project site qualifies as 100 percent impervious, taking into account:
1. The Field investigation Report carried out by the Division of Coastal Management for
State Permit Number 149-98 stated that the lot is considered to be 100% impervious.
2. A concrete floor slab and foundation walls are existing on the site; see Sheet Number
3, Attachment 3 of the CAMA Application.
Assuming you agree that this is a Redevelopment Urban Waterfront project located on 100 percent
impervious site, then:
The buffer requirement of Rule 7H.0209(d)(10) is not required.
2. The impervious surface limit of Rule 7H.0209(h)(4)(A)(ii) does not apply.
3. Rule 7H.0209(h)(4)(B)(iii) permits a non -water dependent, pile supported, single -story
deck over the water.
4. Rule 7H.0209(h)(4)(B)(iii) permits an unenclosed roof over the deck.
The project design improves runoff water quality because the existing concrete slab on the property is
currently being used for vehicular parking. A Storm Water Management Permit may not be required
for this project. For example, if a stormwater management system is determined to be unfeasible to
any extent, the project could be permitted in accordance with Rule 7H.0209(h)(4)(A)(ii) without a
stormwater management system.
Please give your analysis of this letter.
If you have any questions, please call me at you earliest convenience.
Sincerely,
4
George Coffin
copy: Mr. C. R. Stroud, Jr.
G KC