SW8000536_HISTORICAL FILE_20000803

STORMWATER DIVISION CODING SHEET
POST-CONSTRUCTION PERMITS
PERMIT NO. SW8
DOC TYPE ❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE 2060 G� d
YYYYMMDD

1 Statelof North CaWina
Department of Environment
a:ld Natural Resources 1 s
Wilmington Regional Office
James B. Hunt, Jr., Governor �®
Bill Holman, Secretary
E N
Division of Water Quality NORTH CAROUNA DEPARTMENT OF
ENVIRONMENT ANo NATURAL RESOURCES
August 3, 2000
Mr. Jeffrey L. Zimmer, Administrator
ZP No. 73, LLC
1 I 1 Princess Srreet
Wilmington, NC 28401 VY1c10
Subject: Permit No. SW8 000536
Long Leaf Mall Renovations
High Density Stormwater Project
Dear Mr. Zimmer: New Hanover County
The Wilmington Regional Office received a complete Stormwater Management Permit Application for Long Leaf
Mall Renovations on July 24, 2000. Staff review of the plans and specifications has determined that the project,
as proposed, will comply with the Stormwater Regulations set forth in Title 15A NCAC 2H.1000. We are
forwarding Permit No. SW8 000536 dated August 3, 2000, for the construction of Long Leaf Mall Renovations.
This permit shall be effective from the date of issuance until August 3, 2010, and shall be subject to the conditions
and limitations as specified therein. Please pay special attention to the Operation and Maintenance requirements
in this permit.Failure to establish an adequate system for operation and maintenance of the stormwater management
system will result in future compliance problems.
If any parts, requirements, or limitations contained in this permit are unacceptable, you have the right to request an
adjudicatory hearing upon written request within thirty(30)days following receipt of this permit. This request must
be in the form of a written petition; conforming to Chapter 150B of the North Carolina General Statutes, and filed
with the Office of Administrative Hearings, P.O. Drawer 27447,Raleigh,NC 27611-7447. Unless such demands
are made this permit shall be final and binding.
If you have any questions, or need additional information concerning this matter, please contact Linda Lewis, or
me at(910) 395-3900.
Sincerely,
Rick Shiver
Water Quality Regional Supervisor
RSS/arl: S:\WQS\STORMWAT\PERMIT\000536.AUG 4 -
CC' Mark Hargrove, P.E.
Tony Roberts, New Hanover County Inspections
Beth Easley, New Hanover County Engineering
Linda Lewis
Wilmington Regional Office
Central Files
127 Cardinal Dr. Ext.,Wilmington,North Carolina 25405 Telephone [phone] FAX [phone]
An Equal opportunity Affirmative Action Employer 50% recycled/Ill°/,, post-consumer paper

State Stormwater Mana.ement Systems
Permit No. SW8 000536
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER 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
ZP No. 73, LLC
Long Leaf Mall Renovations
New Hanover County
FOR THE
construction, operation and maintenance of an underground infiltration trench in compliance with the provisions
of 15A NCAC 2H.1000(hereafter referred to as the "stornwater 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 permit.
This permit shall be effective from the date of issuance until August 3, 2010 and shall be subject to the following
specified conditions and limitations:
I. 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 S
87,120 square feet of impervious area.
3. Approved plans and specifications for this project are incorporated by reference and are enforceable parts
of the permit.
4. The tract will be limited to the amount of built-upon area indicated on page 3 of this permit, and per
approved plans.
2

State Stormwater Management Systems
Permit No. SW8 000536
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name: Long Leaf Mall Renovations
Permit Number: SW8 000536
I
Location: New Hanover County
Applicant: Mr. Jeffrey L. Zimmer, Administrator
Mailing Address: ZP No. 73, LLC
11 I Princess Srreet
Wilmington,NC 28401 G
Application Date: July 24, 2000 11�
Name of Receiving Stream/Index #: Hewlett's Creek/(CFR 18-87-26) A,"
Classification of Water Body: "SA"
If Class SA, chloride sampling results: N/A (1.5" design storm used)
Trench Dimensions, LxWxH, feet: 150 x 3.9 x 3.32 140 x 5.48 x 3.32
Pipe Diameter: 24" 24"
Pipe Length: 150 feet 280 feet (Double 24")
Permanent Pool Elevation, FMSL: 35.3 36.04
Drainage Area, acres: 0.84 1.5
Total Impervious Surfaces, ft2: 35,720 51,400
Offsite Area entering Pond, ft2: None, per Engineer
Required Storage Volume, ft': 4,247 6,109
Provided Storage Volume, ft3: 1,706 902
Temporary Storage Elevation, FMSL: 38.62 39.36
Controlling Orifice: Bypass to City of Wilmington Storm Sewer
Bypass Weir Elevation: ---- 39.52
Seasonal High Water Table: 33 FMSL
Type of Soil: Sand below clay layer
Expected Infiltration Rate: 29.2 inches per hour
Draw down Time: 8.5 hours 83 hours
3

State Stormwater Management Systems
Permit No. SWR 000536
I1. SCHEDULE OF COMPLIANCE
1. 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.
3. 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 removal.
c. Mowing and revegetation of side slopes.
d. Immediate repair of eroded areas.
e. Maintenance of side slopes in accordance with approved plans and specifications.
f. Debris removal and unclogging of outlet structure, orifice device and 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
ofDWQ. The records will indicate the date,activity,name of person
were taken. performing the work and what actions
5. 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.
S. 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 following items will require a modification to the permit:
a. Any revision to the approved plans, regardless of size.
b. Project name change.
C. Transfer of ownership.
d. Redesign or addition to the approved amount of built-upon 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 was sought.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
10. The Director may determine that other revisions to the project should require a modification to the permit.
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.
4

State Stormwater Management SN'stems
Permit No. SW8 000536
12. Prior to the sale of any portion of the property,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
of any portion of the property.
13. The permittee is responsible for verifying that the proposed built-upon area does not exceed the allowable
built-upon area.
14. The runoff from all built-upon area on the project must be directed into the permitted stormwater control
system.
15. 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.
16. The permittee shall notify the Division of any mailing address changes within 30 days.
III. GENERAL CONDITIONS
1. 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 request must be submitted to the Division of Water
Quality accompanied by an application fee,documentation from the parties involved,and other supporting
materials as may be appropriate. The approval of this request will be considered on its merits and may or
may not be approved.
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 Permittee 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 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
permit modification, revocation and reissuance or termination does not stay any permit condition.
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.
Permit issued this the 3rd day of August, 2000.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
5, ZaA,C_
Kerr T. Stevens, Director
-
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 000536
5

State Stormwater Management Systems
Permit No. SW8 000536
Long Leaf Mall Renovations
Stormwater Permit No. SW8 000536
New Hanover County
Designer's Certification
1> as a duly registered in
the State of North Carolina, having been authorized to observe (periodically/weekly/full time)the construction of
the project,
(Project)
for (Project Owner)hereby state that,to the best of my abilities,due care
and diligence was used in the observation of the project construction such that the construction was observed to be
built within substantial compliance and intent of the approved plans and specifications.
The checklist of items on page 2 of this form is included in the Certification.
Noted deviations from approved plans and specification:
SEAL
Signature
Reeistration Number
Date
6

State Stormwater Management Systems
Permit No. SW8 000536
Certification Requirements:
1. The drainage area to the system contains approximately the permitted acreage.
2 The drainage area to the system contains no more than the permitted amount of built-upon area.
3. All the built-upon area associated with the project is graded such that the runoff drains to the system.
4. The outlet bypass structure elevations are per the approved plan.
5. The outlet structure is located per the approved plans.
6. Trash rack is provided on the outlet/bypass structure.
7. All slopes are grassed with permanent vegetation.
8. Vegetated slopes are no steeper than 3:1.
9. The inlets are located per the approved plans and do not cause short-circuiting of the system.
10. The permitted amounts of surface area and/or volume have been provided.
11. Required drawdown devices are correctly sized per the approved plans.
12. All required design depths are provided.
13. All required parts of the system are provided, such as a vegetated shelf, and a forebay.
14. The overall dimensions of the system, as shown on the approved plans, are provided.
cc: NCDENR-DWQ Regional Office
Tony Roberts,New Hanover County Building Inspector
7

OFFICE USE ONLY
Date Received Fee Paid Permit Number
�7Fd& 000 <3 G
State of North Carolina
Department of Environment and Natural Resources
Division of Water Quality
STORMWATER MANAGEMENT PERMIT APPLICATION FORM
This form may be photocopied for use as an original
I. GENERAL INFORMATION
1. Applicants name (specify the name of the corporation, individual,etc. who owns the project):
iP No. '73 L.L_C-
2. Print Owner/Signing Official's name and title (person legally responsible for facility and compliance):
Se"pyy L, L L C- "0% A S TrA ro r
3. Mailing Address for person listed in item 2 above:
//l Pix;,tce55 1001-10c 2G28 Gv. l ZS ¢oz
City: 4,;, lwt etaltvt, State: NC zip: a8yo
Telephone Number. ( 9/0 ) 7C-46o
4. Project Name (subdivision, facility, or establishment name-should be consistent with project name on plans,
specifications, letters,operation and maintenance agreements,etc.):
Long 4cAf A]w// rQenov.c_ 'oKS
5. Location of Project (street address):
93/O 4 rot /�L✓c! 1�
City: &J" l rh# /t q ioFl County:�1�Yt+� AH O y-e r
6. Directions to project (from nearest major intersection):
or, Ile <ot,tr!l, NG /3 �
anJ
7. Latitude:�/1/ 34 a /3/oo Longitude: Lt! 7 7 S3 00 of project
8. Contact person who can answer questions about the project:
Name: /44 r'tC N- L-4 U fyve Telephone Number: ( 9/0 ) 3 ya - q/ V SI
II. PERMIT INFORMATION:
1. Specify whether project is (check one): _yNew Renewal Modification
Form SWU-101 Version 3.99 Page I of 4

2. If this application is being submitted as the result of a renewal or modification to an existing permit, list the
existing permit number and its issue date (if known)
3. Specify the type of project (check one):
Low Density High Density X Redevelop General Permit Other
4. Additional Project Requirements (check applicable blanks):
CAMA Major K Sedimentation/Erosion Control _404/401 Permit NPDES Stormwater
Information on required state permits can be obtained by contacting the Customer Service Center at
1-877-623-6748.
III. PROJECT INFORMATION
1. In the space provided below, summarize how stormwater will be treated. Also attach a detailed narrative
(one to two pages) describing stormwater management for the project.
5 regeuclo hvevt AA ',d; 1+rdleq
57r✓IIYs i' ` PrGlpv3e—d lc, '1reaT rvvlor-f -1'r a -r'15
2. Stormwater runoff from this project drains to the L4 I%'e_ lcea r- River basin.
3. Total Project Area: �5� 17 acres 4. Project Built Upon Area: %
5. How many drainage areas does the project have? a
6. Complete the following information for each drainage area. If there are more than two drainage areas in the
project, attach an additional sheet with the information for each area provided in the same format as below.
00eW All 11\ I ^c'�"0 t 5" 51em
Basin Information Drainage Area I Drainage Area 2
Receiving Stream Name Na a�e ^; o ewlr. V V nw eCE ea,e
v-r r-e
Receiving Stream Class sA 5A
Drainage Area $ 17 ac a- 3V a e-
Existing Impervious{Area a°},b- q c R• 3 3 4a
Proposed Impervious`Area 9,3, cic a 306Lc --7771
%Impervious'Area (total) `f qg
Impervious"Surface Area Drainage Area 1 Drainage Area 2
On-site Buildings D/ L Sf 3 7/I :Sr
On-site Streets
On-site Parking 55 574 66 ga 51-
On-site Sidewalks a L y Stc 3 9 Jo SF
Other on-site
Off-site
Total: l - 6 3/ SF = a Total: fOaiior'Sf- 2,34a6.
Impervious area is defined as the built upon area including, but not limited to, buildings, roads,parking areas,
sidewalks,gravel areas, etc.
Form SWU-101 Version 3.99 Page 2 of 4

7. How was the off-site impervious area listed above derived?
IV. DEED RESTRICTIONS AND PROTECTIVE COVENANTS
The following italicized deed restrictions and protective covenants are required to be recorded for all
subdivisions, outparcels and future development prior to the sale of any lot. If lot sizes vary significantly, a table
listing each lot number,size and the allowable built-upon area for each lot must be provided as an attachment.
1. The following covenants are intended to ensure ongoing compliance with state stormwater management permit number
as issued by the Division of Water Quality. These covenants may not be
changed or deleted without the consent of the State.
2. No more than square feet of any lot shall be covered by structures or impervious materials.
Impervious materials include asphalt,gravel, concrete, brick, stone,slate or similar material but do not include wood
decking or the water surface of swimming pools.
3. Swales shall not be filled in,piped, or altered except as necessary to provide driveway crossings.
4. Built-upon area in excess of the permitted amount requires a state stormwater management permit modification prior to
construction.
5. All permitted runoff from outparcels or future development shall be directed into the permitted stormwater control
system. These connections to the stormwater control system shall be performed in a manner that maintains the integrity
and performance of the system as permitted.
By your signature below,you certify that the recorded deed restrictions and protective covenants for this project
shall include all the applicable items required above, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land,that the required covenants cannot be changed or deleted
without concurrence from the State, and that they will be recorded prior to the sale of any lot.
V. SUPPLEMENT FORMS
The applicable state stormwater management permit supplement form(s) listed below must be submitted for each
BMP specified for this project. Contact the Stormwater and General Permits Unit at [phone] for the status
and availability of these forms.
Form SWU-102 Wet Detention Basin Supplement
Form SWU-103 Infiltration Basin Supplement
Form SWU-104 Low Density Supplement
Form SWU-105 Curb Outlet System Supplement
Form SWU-106 Off-Site System Supplement
Form SWU-107 Underground Infiltration Trench Supplement
Form SWU-108 Neuse River Basin Supplement
Form SWU-109 Innovative Best Management Practice Supplement
Form SWU-101 Version 3.99 Page 3 of 4

VI. . SUBMITTAL REQUIREMENTS
Only complete application packages will be accepted and reviewed by the Division of Water Quality (DWQ).
A complete package includes all of the items listed below. The complete application package should be
submitted to the appropriate DWQ Regional Office.
1. Please indicate that you have provided the following required information by initialing in the space provided
next to each item.
Initials
• Original and one copy of the Stormwater Management Permit Application Form MNhI
• One copy of the applicable Supplement Form(s) for each BMP IJ
• Permit application processing fee of$420 (payable to NCDENR) M N
• Detailed narrative description of stormwater treatment/management 13
• Two copies of plans and specifications, including: Al rN
- Development/Project name
-Engineer and firm
- Legend
- North arrow
-Scale
- Revision number& date
-Mean high water line
-Dimensioned property/project boundary
- Location map with named streets or NCSR numbers
- Original contours, proposed contours, spot elevations, finished floor elevations
- Details of roads,drainage features, collection systems, and stormwater control measures
-Wetlands delineated, or a note on plans that none exist
-Existing drainage (including off-site), drainage easements, pipe sizes, runoff calculations
-Drainage areas delineated
-Vegetated buffers (where required)
VII. AGENT AUTHORIZATION
If you wish to designate authority to another individual or firm so that they may provide information on your
behalf, please complete this section.
Designated agent (individual or firm): 1EQ5�Jv:nd ENbxr-r-ritl Coiv�, cLmy LLP
Mailing Address:_/))'' pri hCr SS S�ree- 14
j3
City: 6y w� :K-1 x'A State:_/V Zip:
v
Phone: ( 91 t) Fax: ( 910 ) .3 9 a — 9/y J
VIII. APPLICANT'S CERTIFICATION
I, (print or type name of person listed in General Information, item 2) fe i-t -
certify that the information included on this permit application form is, to th best of my knowledge, correct and
that the project will be constructed in conformance with the approved plans,that the required deed restrictions
and protective covenants will be recorded,and that the proposed project complies with the requirements of 15A
NCAC 2H .1000.
Signature: Date: 7 �O
Form SWU-101 Version 3.99 Page 4 of 4

r
Eastwind Engineering Company, LLP
Engineering• Planners •Architects
I I Princess St. P.O.Box 2628 Wilmington,North Carolina,28402 910-342-9144 FAX [phone]
STORMWATER NARRATIVE FOR NCDWO
The Long Leaf Mall Renovation project totals 25.17 acres in area. The mall portion of the shopping
center is planned to be demolished and new retail shops are proposed to replace them. The existing site is
95.4% impervious. The renovations to the site actually reduce the imperviousness by 0.23 acres to 94.5%
imperviousness. Landscape islands have been added throughout the parking lot to help break up the sea of
pavement. The existing drainage system will continue to be utilized to convey the surface water runoff off
of the site. The area at the southeast corner of the property will be regraded due to the requirements of the
finished floor elevations. This resulted in regrading the parking lot. Two new drop inlets were added and
one was relocated. These three drop inlets connect to the existing drainage system discharging into the
ditch within the NCDOT right-of-way along South College Road.
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SEAL
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RECEIVED
MAY 1 ,8 2000
DWQ
PROD#

RF C F,IVED
JUL 2 J= 2000
Eastwind-EngineeringCompany, LLP gi;
Engineering • Planners•Architects
111 Princess St. P.O.Box 2628 Wilmington,North Carolina,28402 910-342-9144 FAX [phone]
July 24, 2000
Ms. Linda Lewis
N.C. Department of Environment
and Natural Resources
Division of Water Quality Section
127 Cardinal Drive Extension
Wilmington, NC 28405
Re: NCDWQ Permit for Long Leaf Mall Renovations
NCDWQ Project No. SW8 000536
Wilmington, NC
Dear Ms. Lewis:
Per our discussions in the site meeting held on Friday July 21, 2000, the plans have been modified to
increase the bottom trench width 5 feet on each side of the infiltration trench. Notes have been added to
the plan indicating that the Contractor shall excavate the trench such that the clay layer that is present at 6+
feet deep shall be removed.
Attached are two copies of the sheets that had to be revised. They are:
• Sheet C-6, Dimensioned Layout and Paving Plan—Phase I and II
• Sheet C-7, Utility Plan and Landscape Plan— Phase I and II
• Sheet C-9, Utility Plan and Landscape Plan—Phase I and 11
• Sheet C-14, Miscellaneous Details—Phase I, 11, and III
Please feel free to call if you have any questions.
Very truly yours,
EASTWIND ENGINEERING COMPANY,LLP
Mark N. Hargrove, P.E.
cc: Jeffrey L. Zimmer—Zimmer Development
Frank T. Grzandziel—Zimmer Development
Rod Young—Zimmer Development

r
D
B J JUL 2'f-2000
Eastwind Engineering LLP -
Engineering• Planners•Architects Y:
ttt Princess St. P.O. Box 2628 Wilmington,North Carolina,28402 910-342-9144 FAX [phone]
July 20, 2000
Linda Lewis
N.C.
��
N Department of Environment C��g T�
and Natural Resources
Division of Water Quality Section
127 Cardinal Drive Extension JUL 2 12000
Wilmington, NC 28405
PROJ# DWQ
Re: NCDWQ Permit for Long Leaf Mall Renovations
NCDWQ Project No. SW8 000536
Wilmington, NC
Dear Ms. Lewis:
We have addressed your comments in the letter dated June 26, 2000. The following is a response to your
comments:
1) A note has been placed on Sheet C4 of the plans stating that no wetlands exist within the
limits of construction.
2) Page 2 of 4 of the Storm Water Management Application Form has been revised to account
for the infiltration system.
3) The infiltration system has been referenced in the narrative and in Section III Part 1 of the
application.
4) A completed infiltration trench supplement is provided.
5) Two copies of Sheet C9a are being provided as separate sheets that show the drainage area for
the infiltration system. The architect has been provided this information in order for them to
design the drainage system for the roof.
6) The calculations and the permit application for the infiltration system have been changed to
account for the 1.5-inch design storm. The infiltration system actually has been designed to
infiltrate the runoff for more than the 1.5-inch storm. Please sec the attached calculations.
7) The weir height for the over flow weir has been changed to the same elevation as the top of
the infiltration trench. The detail has also been modified.
8) A note has been placed on Sheet C2 under the"Grading and Drainage Notes"on note No. 10
stating that the underlying clay layer shall be removed and replaced with clean select fill
material.
9) A report prepared by a soil scientist is provided indicating that the seasonal high water table is
8+ feet deep in the infiltration area.
Enclosed please find the following items:
• original revised Page 2 of 4 of"Storm Water Management Application Form"with one additional
copy and one original "Underground Infiltration Trench Supplement"and one copy
• Two revised copies of the storm water calculations for the infiltration system

Linda Lewis
Page 2
• Two copies of the storm water narrative describing the infiltration system
• two (2)copies of revised plan sheets:
Cover Sheet—C21
• One copy of Sheet C-9a—showing drainage area for infiltration system
Please feel free to call if you have any questions.
Very truly yours,
EASTWIND ENGINEERING COMPANY,LLP
AL",14
Mark N. Hargrove, P.E.
cc: Jeffrey L. Zimmer—Zimmer Development
Frank T. Grzandziel—Zimmer Development
Rod Young—Zimmer Development

JUL 19 100 10:30 FR LAW-COMPANY WILM NC 910 791 1338 TO 3429141 P.02iO4
EASTERN SOILS LIMITED
Post Office Box 10161
Wilmington, North Carolina 28404
TeUFaK(91 M 88&QM
Consulting EtxlMnmenW ;r*ntis%
July 19, 2900 REJ CE IVE I�
Mr. Carter Hubard, PE .JUL 2 1 2000
Law Engineering&Environmental Services, Inc.
5710 Oleander Drive, Suite 110 DWQ
Wilmington,North Carolina 28403 PROD#
SUBJECT_ Estimated Seasonal High Water Table
Proposed Stormwater Infiltration System Site
Long Leaf Mall
LEES Project No. 31000-0-1373
ESL Project No. 00-116
Dear Mr, Hubard:
At your request, hand-auger borings were made in three locations along the proposed
stormwater infiltration system site(see attached figure). The purpose of the borings was
to observe soil characteristics that can be indicative of the position of the seasonal high
water table(SHWT)within the soil profile. These can include soil colors of chroma 2 or
less and/or the presence of specific soil layers such as a spodic (13h)horizon. The borings
were made to a depth of about I I feet. The borings were designated HA-1 through
HA-3.
Extensive alteration of the site through construction and drainage appears to have
influenced the natural hydrology of the area. Indicators of soil saturation, however, can
remain, even when the soil profile is no longer saturated. Soil characteristics observed in
the boreholes made for this study suggest that the SHWT originally was located at a depth
of about 62 in. (HA-1), 60 in. (HA-2), and 55 in. (HA-3)below the Assam d orieinal
ground surface (see following table). There are indicators that the area around boring
HA-1 has about 18 inches of fill, and that the area around boring HA-3 was cut about 40
inches. These are the depths to an apparent$h horizon and/or grey mottles in the argillic
(Bt) horizon.

JUL 19 '00 10:30 FR LAW-COMPANY WILM NC 910 791 1338 TO 3429141 P.03iO4
Mr. Carter Hubard, PE
Page 2
Boling De th terra monks Depth to Bb Original SHWT depth
HA-1 SO in. — 62 in
HA-2 60 in, 55 in. unchanged
HA-3 15 in.and 75 in. 15 in.and 53 in, 55 in,
While the SHWT is likely deeper than the soil morphological characteristics indicate, it is
probable that percolating water is"perched"(episaturation) at these depths for a short
period during wet periods.
We did not observe free water in any of the three borings at the time that they were made.
Soil moistpre was higher above the organic hardpan layers (Bh) and the finer textured soil
layers(Bt). These observation seem to indicate that, as mentioned previously, extensive
alteration of the area of the site through construction and drainage improvements has
lowered the water table. Based on the observations that we made on the subject site, it is
our opinion that the present SHWT is probably located at a depth of 8+feet below the
ground surface.
If you have any questions about this report please call.
Sincerely,
SOIL SC
t
�p R. q L
W. R. (Bill) Dunlop,Jr.,LSS
NC Licenfed Soil Scientist#1095
Attachment
1995 \
�A10R1F1
EASTERN SOILS LIMITED P.O. Box 10161 Wilmington,NC 28404

JUL 19 '00 10:30 FR LAW—COMPANY WILM NC 910 791 1338 TO 3429141 P.04iO4
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STORM WATER CALCULATIONS
FOR
INFILTRATION SYSTEM
LONG LEAF MALL RENOVATIONS
WILMINGTON,NORTH CAROLINA
VA CAR
�ESEA�N9rgsst
RECEIVED r•��° '� ry
2 2��� = .7 19742 I�s
JUL s •N
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���iCyOLAS���
PROJ # �(iUB NofafuM+"•
/�2_ ,4�
PREPARED BY
EASTWIND ENGINEERING COMPANY,LLP
111 PRINCESS STREET
WILMINGTON,N.C. 28402
[phone]
May 18,2000
(revised 7/20/00)

Eastwind Engineering Company, LLP
Engineering• Planners•Architects
l I I Princess St. P.O. Box 2628 Wilmington North Carolina 28402 910-342-9144 FAX [phone]
STORMWATER NARRATIVE FOR INFILTRATION
Revised 7/20/00
The redevelopment of Long Leaf Mall will actually reduce the amount of impervious area on site by 0.23
acres. The southeast corner of the existing mall will be demolished and some pavement will be removed
and the parking lot regraded. However, due to existing underground utilities such as water and gas that
are in the area, the infiltration system could not be placed in the area that was regraded. The infiltration
system had to_be placed in the existing parking lot in front of the proposed Home Place and Pets Plus
stores.
The owner will utilize the"payment in lieu"of option to meet the City of Wilmington's storm water
requirements. In addition to the "payment in lieu"of option, an infiltration system has been designed to
infiltrate the 1.5-inch runoff from±2.34 acres. The infiltration system will provide an emergency outlet
for the 50-year storm event. A copy of a soils and infiltration report has been provided as an attachment.
The infiltration report states that the existing soils will infiltrate an average rate of 1.9 x 10"'cmZ/sec(29
in/hr) for sands underlying a clay layer that is to be removed.
The surface runoff for the infiltration system will be collected in drop inlets and dispersed into infiltration
pipes. The drop inlets will be designed to have a 2-foot settling pool in the bottom of the inlets. These
settling pools will allow for additional storm water treatment and sediment settling prior to entering the
infiltration piping. The overflow from the system in higher frequency storms will outlet into the existing
drainage system on the property and will be conveyed to Watson's Branch, a tributary of Hewlett's Creek.
To meet the requirements of Section [.1003 (d)(3)(B)] to the maximum extent practicable,±.390 LF of
perforated pipe for infiltration has been added in the parking lot that can infiltrate the 1.5-inch runoff from
±2.34 acres of drainage area. This area was chosen for the infiltration system because there are no
existing utilities in close proximity, the soils are good and the existing elevations in the parking lot
allowed runoff to enter the infiltration system in a manner that did not require regrading of the parking lot.
The infiltration system was designed to meet and exceed the State's requirements.
The first segment of the infiltration system infiltrates runoff from±0.84 acres. The first segment has 150
L.F. of 24-inch ADS perforated pipe with No. 57 washed stone. This part of the infiltration system can
infiltrate runoff from the 1.5-inch storm (4,300 cf plus an additional 5,150 cf of storm water runoff). The
second segment of the infiltration system infiltrates runoff from± 1.5 acres. There is±280 L.F. of 24-
inch ADS perforated pipe with No. 57 washed stone.This part of the system can infiltrate runoff from the
1.5-inch storm plus an additional 9,940 cf of storm water runoff.

Eastwind Engineering Company, LLP
Sheet No. 1 of 5
Job Long Leaf Mall Subject Infitration System Design Job No. 20003 00
Designed by MNt1 Date 7120L00 Checked by Date
Infiltration System Design ASPHALT PARKING LOT
Determine runoff amount:
Total area= 0.84 acres < 20 acres, therefore use the rational method
Pervious area = 0.02 acres
Impervious area= 0.82 acres % impervious = 98%
NCDENR DESIGN :
Collect the runoff from the first 1.5 inch of rainfall.
Determine Composite "C"value:
C (pavement) = 0.95 X 0.98 = 0.93
C (grass) = 0.20 X 0.02 = 0.00
Composite C = 0.93
Volume to store = Runoff= CIA = 4,300 ft3
.ITY OE WI MIN GTON DESIGN
Store the volume of runoff minus the volume infiltrated during the storm.
Use 10-year design storm, 6 hr duration per CoW standards.
Depth = 0.0 inches = P
Use SCS Curve Number
Asphalt= 98
Baymeade Soil = 39
CN = (% impervious)(Asphalt C)+ (% pervious)(pervious C)
CN = 97
Soil storage Capacity, S = 1000/CN-10 = 0.35
Runoff, R = P-0.2S z = 0.02 inches
(P+O.BS)
Runoff volume= Runoff Depth X Area = 54 ft3
Volume to store = 54 ft3
Minimum Volume to Store (prior to subtracting infiltrated amount) = 9,450 ft

Eastwind Engineering Company, LLP 7120/00
Sheet No. 2 of 5
Job Long Leaf Mall Subject Infitration System Design Job No. 20003.00
Designed by MNH Date 7/20/00 Checked by Date
Design Post Development Discharge Rate To Equal Pre-Development Discharge Rate
Hydrograoh Formulation
1.) Estimate Peak
Watershed Area = 0.84 acres
Pre-Development Discharge Rate Determination, OP,a Qp,a=CIA C=!0:88.' . '
Determine Rainfall Intensity, I
Kirpich Method(<20 acres) SiW" OW-60
L H T, 1 (10 Year) 1 (50 Year) (cfs) (cfs)
155: 1 3 7.23 8.87 5.34 6.56
Post Development Discharge Rate Determination, Qosst Qpost=CIA C=088
Determine Rainfall Intensity, I
Kirpich Method(<20 acres) O"a w Qpast6G
L H T, 1 (10 Year) 1 (50 Year) (cfs) (cfs)
155 .1 3 7.23 8.87 5.34 6.56
2.) Estimate Volume of Run-off
Use 10-year design storm, 6 hour duration. Depth = : 4:8 inches
Pre Devel. Soil Storage Capacity, S = 1000/CN -10 = 0.75 where CN =1„93 ,
Pre Devel. Run-off, R=( P -0.2 S)`/( P + 0.8 S) P = 4.8
Post Devel. Soil Storage Capacity, S = 1000/CN-10 = 0.35 where CN =,_97 '
Post Devel. Run-off, R=( P - 0.2 S)`/( P + 0.8 S) P = 4.8
3.) Set the shape of the hydrograph
Pre Devel. Time to Peak, Tp = 43.5*Area*Runoff = r 27.4 min.
Qpre10
Post Devel. Time to Peak, Tp = 43.5*Area* Runoff = 30.1 min.
Qpostl 0
4.) Estimate the Required Storage, S
S = (Qpost-Qpre) x Tpl Opost x 1.39 x 60 = 0 CF
5.) Hydrograph Formulation
Discharge (Q)
Time(t)min. Post Pre Time Increment = 0 1 *Tp

Eastwind Engineering Company, LLP 7/20/00
Sheet No. 3 of 5
Job Long Leaf Mall Subject Infitration System Design Job No. 20003.00
Designed by MNH Date 7120/00 Checked by Date
0 0.00 0.00
3.01 0.13 0.16
6.02 0.51 0.61
9.03 1.10 1.31
12.04 1.85 2.17
15.0 2. 3.09
18.06 3.50 3.96 10-Year Storm Event Inflow Hydroaraoh
50
21.07 4.24 4.68 t Post Devel Inflow -m-Pre Devel Inflow
24.07 4.83 5.16
27.08 5.21 5.34
6
30.09 5.34 5.21 ---�- -- -_
33.10 5.21 4.78 w 5 . . .
36.11 4.83 4.17 p 4
39.12 4.28 3.61 rn 3 ki
42.13 3.76 3.13
45.14 3.30 2.72 2
48.15 2.90 2.35 0 1 ' -
51.16 2.54 2.04 0
54.17 2.23 1.77 0 20 40 60 80 100 120 140
57.18 1.96 1.53
60.19 1.72 1.33 Time,t(min)
63.20 1.51 1.15
66.20 1.33 1.00
69.21 1.17 0.87
72.22 1.02 0.75
75.23 0.90 0.65
78.24 0.79 0.56
81.25 0.69 0.49
84.26 0.61 0.42
87.27 0.53 0.37
90.28 0.47 0.32
93.29 0.41 0.28
96.30 0.36 0.24
99.31 0.32 0.21
102.32 0.28 0.18
105.33 0.25 0.16
108.34 0.22 0.13
111.34 0.19 0.12
114.35 0.17 0.10
117.36 0.15 0.09
120.37 0.13 0.08
123.38 0.11 0.07
126.39 0.10 0.06
129.40 0.09 0.05
132.41 0.08 0.04

Eastwind Engineering Company, LLP
Sheet No. 4 or 5
Job I ono i eat Mall Subject lnfltration'systeem Deslion Job No. 90003 00
Designed by MNL Date 7120d14 Checked by Date
Infiltration System Design
1.)Determine Trench Volume per linear foot including stone: Use 24"ADS Pipe
pipe inside diameter (in) = 24
clear width between pipes (ft) = 1.57
pipe outside diameter(in) = 27.8
trench width (in) = 46.6 = 3.89 feet
rock void ratio (%) = 40
pipe volume (cf) = 3.14
rock volume (cf) = 6.73
void volume (cf) = 2.69
Total volume of water per linear foot (cf): 5.83
2.)Determine Infiltration Rate For Full Trench:
From Darcy's Law, q =kiA= (k)(h/L)(A), where h/L is the hydraulic gradient. Mim
Eley
min. distance to SHWT (ft) = 2 -4.18 -2.18
min. depth, EP to top of pipe (in) = 12 -5.18 -3.16
depth of stone under pipe (in) = 6
depth to seasonal high water table (ft) = 10
coefficient of permeability,k (cm/s) = 0.0190 h -7.50 -5.50
proposed bottom area of trench (so = 583 -6.00 -6.00
head loss, h(ft) = -4.82 L
unit length, L(ft) = -2.00
-10.00 -a.00
q (cfs/If) = 0.00583 q(cfs)= 0.88
Check the outflow from the pipe, (ADS Tech Note 2.105). hi= 24 inches
Outflow, Q= 0.025+1.12(h;)+0.056(hl)2 0= 0.132 cfS/ft > 0.00583 cfs/If
Therefore infiltration rate of 0.0058 cfs/If is OK.
3.)Approximate Infiltration Time For Full Trench:
Depth of water in trench will vary. Use one half of depth as an average.
ghrz (cfs/If) = 0.00292 q (cfs) = 0.44
Time for water to exfiltrate from trench= 6.0 hours

Eastwind Engineering Company, LLP
Sheet No. 5 of 5
Job Long Leaf Mall Subject Infltrallon System Design Job No. 20003.00
Designed by MNH Date 7/20M Checked by Date
4.)Determine Infiltration Rate during Storm Event
Ideally, the trench will completely fill with water at the end of the storm event.
The amount infiltrated during the storm will vary with time, based on the driving head.
Since infiltration rate varies linearly with the driving head as shown below, assume
the trench is half full for the entire storm period as an average to determine amount
infiltrated during the storm event.
Amount infiltrated during the storm event = 6hrs x infiltration rate at h(ft) = 2.41
Rate of infiltration qw(cfs/If) = 0.00292
Infiltration Rate vs. Driving Head
7.0
5.0
-
ar°i 4.0 -
S
IM 3.0
C
2.0
G
1.0
0.0
v v n M ro N c� N N m N N
0 0 09
0 0 0 0 0 9 0 0 9 0 0 0 0 0
w w w w w w w w w W w w w w w
N n o m m m N o rn r m a N
N N r m m m O N O N O
N N - ' N N t") M < Q N m m (6 r
Infiltration Rate (cfs/If)
5.)Size The Infiltration System
Linear feet required for storage(w/o infiltration): 1,620
Adjust layout until Runnoff- 0I6 = Storage
Try 1 rows at 150 feet. End length = 2.3 feet.
Linear feet used for infiltration: 150 Infiltration Rate, q (cfs) = 0.44
Storage = 902 (cf)
Amount Infiltrated, 0I6 = 9,450 (cf)
Runoff- QI6 = 0 (cf) < 902 (cf)

Eastwind Engineering Company, LLP
Sheet No. 1 of 5
Job Long Leaf Mail Subject Infitration System Desian Job No. 20449.4O
Designed by MN11 Date 4/2WQQ Checked by Date
Infiltration Svstem Design ASPHALT PARKING LOT
Determine runoff amount:
Total area = 1.50 acres < 20 acres,therefore use the rational method
Pervious area= 0.02 acres
Impervious area= 1.48 acres % impervious = 99%
NCDENR DESIGN
Collect the runoff from the first 1.5 inch of rainfall.
Determine Composite "C" value:
C (pavement) = 0.95 X 0.99 = 0.94
C (grass) = 0.20 X 0.01 = 0.00
Composite C = 0.94
Volume to store = Runoff= CIA = 7,700 ft3
CITY OE WILMINGTON DESIGN '
Store the volume of runoff minus the volume infiltrated during the storm.
Use 10-year design storm, 6 hr duration per CoW standards.
Depth = 0.0 inches = P
Use SCS Curve Number
Asphalt= 98
Baymeade Soil = 39
CN = (% impervious)(Asphalt C)+ (% pervious)(pervious C)
CN = 97
Soil storage Capacity, S = 1000/CN-10 = 0.29
Runoff, R = (P-0.2S)2 = 0.01 inches
(P+0.8S)
Runoff volume = Runoff Depth X Area = 78 ft3
Volume to store = 78 ft3
Minimum Volume to Store (prior to subtracting infiltrated amount) = 17,640 ft

Eastwind Engineering Company, LLP 7/20/00
Sheet No. 2 of 5
Job Long Leaf Mall Subject Infitration System Design Job No. 20003.00
Designed by MNH Date 4/20/00 Checked by Date
Design Post Development Discharge Rate To Equal Pre-Development Discharge Rate
Hydrograoh Formulation
1.) Estimate Peak
Watershed Area = 1.50 acres
Pre-Development Discharge Rate Determination, QPre Qp,a CIA C='0:91
Determine Rainfall Intensity, I
Kirpich Method(<20 acres) QP.w QP,.w
L H T, 1 (10 Year) 1 (50 Year) (Cfs) (Cfs)
155 1 3 7.23 8.87 9.87 12.11
Post Development Discharge Rate Determination, Qposr Qposr=CIA C= 0191,1
Determine Rainfall Intensity, I
Kirpich Method(<20 acres) QP..tw QP-M
L H T� I (10 Year) 1 (50 Year) (Cfs) (Cfs)
155 1 3 7.23 8.87 9.87 12.11
2.) Estimate Volume of Run-off
Use 10-year design storm, 6 hour duration. Depth = "4':8 :inches
Pre Devel. Soil Storage Capacity, S = 1000/CN-10 = 0.64 where CN = 94,{
Pre Devel. Run-off, R=( P -0.2 S)`/( P + 0.8 S) P = 4.8
Post Devel. Soil Storage Capacity, S = 1000/CN -10 = 0.29 where CN
Post Devel. Run-off, R=( P - 0.2 S)`/( P + 0.8 S) P = 4.8
3.) Set the shape of the hydrograph
Pre Devel. Time to Peak,Tp = 43 5*Area*Runoff = 27.2 min.
Qpre10
Post Devel.Time to Peak, Tp = 44 S*Area*Runoff
Qpostl0
4.) Estimate the Required Storage, S
S = (Qpost-Qpre) x Tpl Opost x 1.39 x 60 = 0 CF
5.) Hydrograph Formulation
Discharge (Q)
Time(t)min. Post Pre Time Increment= 0.1 ' , *Tp

Eastwind Engineering Company, LLP
Sheet No. 4 of 5
Job Long Leaf Mall Subject ofitration System Desion Job No. 20003 00
Designed by MM Date 4/2= Checked by Date
Infiltration System Desion
1.)Determine Trench Volume per linear foot including stone: Use 24"ADS Pipe
pipe inside diameter (in) = 24
clear width between pipes (it) = 1.57
pipe outside diameter(in) = 27.8
trench width (in) = 46.6 = 3.89 feet
rock void ratio (%) = 40
pipe volume (cf) = 3.14
rock volume (co = 6.73
void volume (cf) = 2.69
Total volume of water per linear foot(cf): 5.83
2.)Determine Infiltration Rate For Full Trench:
From Darcy's Law, q =kiA= (k)(h/L)(A), where h/L is the hydraulic gradient. 11 UL
Elea
min. distance to SHWT (ft) = 2 -4.18 -2.18
min. depth, EP to top of pipe (in) = 12 -5.18 -3.15
depth of stone under pipe (in) = 6
depth to seasonal high water table (ft) = 10
coefficient of permeability, k (cm/s) = 0.0190 h -7.50 -5.50
proposed bottom area of trench (sf) = 1,088 -6.00 -6.00
head loss, h(ft) = -4.82 L
unit length, L(ft) -2.00
-to.00 -e.00
q (cfs/If) = 0.00583 q(cfs)= 1.63
Check the outflow from the pipe, (ADS Tech Note 2.105). hi= 24 inches
Outflow, 0= 0.025+1.12(hl)+0.056(h;)2 0 = 0.132 cfs/ft > 0.00583 cfs/If
Therefore infiltration rate of 0.0058 cfs/If is OK.
3.)Approximate Infiltration Time For Full Trench:
Depth of water in trench will vary. Use one half of depth as an average.
qht,(cfs/If) = 0.00292 q (cfs)= 0.82
Time for water to exfiltrate from trench= 6.0 hours

Eastwind Engineering Company, LLP
Sheet No. 5 of 5
Job t.aIlg.Leaf Mall Subject Infitration System Design Job No. 20003.00
Designed by IdNll Date 4[20/99 Checked by Date
4.)Determine Infiltration Rate during Storm Event
Ideally, the trench will completely fill with water at the end of the storm event.
The amount infiltrated during the storm will vary with time, based on the driving head.
Since infiltration rate varies linearly with the driving head as shown below, assume
the trench is half full for the entire storm period as an average to determine amount
infiltrated during the storm event.
Amount infiltrated during the storm event= 6hrs x infiltration rate at h(ft) = 2.41
Rate of infiltration %, (cfs/If) = 0.00292
Infiltration Rate vs. Driving Head
zo —
6.0
-
v
0
d 4.0 - -
x
0) 3.0
C
2.0 _.
0
1.0 -
0.0
a a N N N N N m m N N N N M
0 0 0 0 0 0 0 0 0 0 0 0 0 9 0 0
W W W W W W W W W W W W W W W
N h O m tp V N ^ CJ ^ O m h C0 �(l V N
N 1� tO t0 tD O Iq O O
Infiltration Rate (cfs/If)
5.) Size The Infiltration System
Linear feet required for storage(w/o infiltration): 3,023
Adjust layout until Runnoff- Q16 = Storage
Try 2 rows at 140 feet. End length = 6.2 feet.
Linear feet used for infiltration: 280 Infiltration Rate, q (cfs) = 0.82
Storage = 1,706 (cf)
Amount Infiltrated, Qls = 17,640 (cf)
Runoff- 016 = 0 - (cf) < 1,706 (cf)

L-19-2000 WED 10: 37 AM EASTWIND ENGINEERING 19103429141 P, 001/004
1929-0 OLEANDER DRIVE,WILMINGTON,N.C. 284M
i PHONE: [phone]
11 FAX: [phone]
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JUL-19-2000 WED 10: 37 AM EAHWIND ENGINEERING 29103429141 P. 002/004
JUL 19 '00 10130 FR LAW-COMPANY WILM NC 910 791 1339 TO 3429141 P,02iO4
EASTERN SOILS LIMITEID
Post Office Box 10t81
Wllmington, North Carolina 28W
TaVPex(e10)WeO00e
July 19,2900
Mr. Carter Hubard,PE
Law Engineering&Environmental Services, Inc.
5710 Oleander Drive, Suite 110
Wibningtgn,North Carolina 29403
SUBJECT- Estimated Seasonal High Water Table
Proposed Stormwater bfiitrsdon System Site
Long Leaf Mall
LEES Project No. 31000-0-1373
ESL Project No. 00-116
Dear Mr.Hubard,
At your request, hand-auger borings were made in three locations along the proposed
stormwatgr infiltration system site(see attached figure). The purpose of the borings was
to observe soil characteristics that can be indicative of the position of the seasonal high
water table(SHWT)within the soil profile, These can include soil colors of ehrorna,2 or
less and/or the presence of specific soil layers such as a spodic(Bh)horizon. The borings
were mad4 to a depth of about 11 feet. The borings were designated HA-1 through
HA-3.
Extensive alteration of the site through construction and drainage appears to have
influenced the natural hydrology of the area. Indicators of soil saturation,however,can
remain, even when the soil profile is no longer saturated. Soil characteristics observed in
the boreholes made for this study suggest that the SHWT originally was located at a depth
of about 62 in. (HA-1),60 in. (HA-21 and 55 in. (HA-3)below the aeainne 1 original
gmiwel sums(see following table). Thera are indicators that the area around boring
HA 1 has about 18 inches of fill,and that the area around boring HA-3 was cut about 40
inches- These are the depths to an apparent Bh horizon and/or grey mottles in the argiiflc
(Bt)horizon.

JUL-19-2000 WED 10: 37 AM EASTWIND ENGINEERING 29103429141 P, 003/004
JUL 19 '00 10:30 FR LAW-COMPANY WILM NC 910 791 1338 TO 3429141 P.03iO4
Mr. Carter Hub ard,PE
Page 2
Boring Depth to ffm mottle D90M to Rh Original S-H—W eeah
HA-1 sofa. - 62�
HA-2 60 in. 55 in. muchansed
HA 3 15 in and 75 in. 15 in.aud 55 in. �55 in.
While the SHWT is likely deeper than the soil morphological characteristics indicate, it is
probable that percolating water is`perched"(episaturation)at these depths for a short
period during wet periods.
We did not observe flee water in any of the three borings at the time that they were made.
Soil moisture was higher above the organic hardpan layers(Bh) and the finer textured soil
layers (Bt). These observation seem to indicate that, as mentioned previously, extensive
alteration pf the area of the site through construction and drainage improvements has
lowered the water table. Based on the observations that we made on the subject site, it is
our opinion that the present SHWT is probably located at a depth of 8+feet below the
ground sutfisee.
If you have any questions about this report please call.
Sincerely,
SOIL SC
W. R. (Bill)Dunlop,Jr.,LSS J �Y
NC Ilcenfed Soil Scientist#1095
Attachment
M7RM
EASTERN SOILS LIMITED P.O. Box 10161 Willmngton,NC 28404

JUL-19-2000 WED 10: 38 AM EASTWIND ENGINEERING 29103429141 P. 004/004
• JUL 19 '00 10:30 FR LAW-COMPANY WILM NC 910 791 1338 TO 3429141 P.04iO4
a ,
all
xmiuw l
IZJ
tz
e. ,\ \
TOTAL PAGE.04

State of North Carolina
Department of Environment
and Natural Resources A
0
0 Wilmington Regional Office �
� k
James B. aunt, Jr., Governor NCDENR
Bill Holman, Secretary
Division of Water Quality NORTH CAROUNA DEPARTMENT OF
ENVIRONMENT ANo NATURAL RESOURCES
June 29, 2000
Mr. Jeffrey Zimmer, Administrator
ZP No. 73, LLC
PO Box 2628
Wilmington, NC 28401
Subject: ACKNOWLEDGMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 000536
Long Leaf Mall Renovations
New Hanover County
Dear Mr. Zimmer: r
G •
The Wilmington Regional Office received a Stormwater Management Permit Application for Long
Leaf Mall Renovations on May 18, 2000. A preliminary review of that information has determined that the
application is not complete. The following information is needed to continue the stormwater review:
1. Delineate all wetlands on site, disturbed or undisturbed, or note on the plans that none exist.
2. Please provide the required information in Section III Part 6 of the application regarding the
drainage area to the infiltration system. Label one column as the overall site, and the other as
the infiltration system.
3. Please reference the infiltration system in the narrative and in Section III Part 1 of the
application, the stormwater system summary.
4. Please provide a completed infiltration trench supplement.
5. Please delineate the drainage area to the infiltration system.
6. Please either use a design storm of 1.5", or provide the results of a chlorides test taken at a
point in the receiving stream that is at least '/ mile from the proposed discharge point, as the
crow flies, after at least 3 days without rain. If the chlorides level is less than 500 ppm, then
you will be allowed to use the I" design storm.
7. If the weir height is set at the elevation of the top of the pipe, then you lose the storage
volume in the 6" of trench located above the pipe. To take full advantage of the storage
available, please set the weir elevation at the top of the trench, or revise your storage
calculations.
8. Please either note on the plans that you will be undercutting the clay layer as noted in the
soils report or recalculate the flowrate in the system using the coefficient of permeability, k,
of .0019 cm2/sec, as indicated in the soils report for the soils above the clay layer.
9. Our soil scientist is out of the office until July 17. 1 will be in contact with him at that time to
schedule a site visit to verify the soil conditions and seasonal high water table.
127 Cardinal Dr. Est,Wilmington,North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10%post-consumer paper

Mr. Zimmer
June 29, 2000
Stormwater Project No. SW8 000536
----------------------------------------------
Please note that this request for additional information is in response to a preliminary review. The
requested information should be received by this Office prior to July 29, 2000, or the application will be
returned as incomplete. The return of a project will necessitate resubn-ttal of all required items, including
the application fee.
If you need additional time to submit the information, please mail or fax your request for a time
extension to the Division at the address and fax number at the bottom of this letter. The request must
indicate the date by which you expect to submit the required information. The Division is allowed 90
days from the receipt of a completed application to issue the permit.
The construction of any impervious surfaces, other than a construction entrance under an approved
Sedimentation Erosion Control Plan, is a violation of NCGS 143-215.1 and is subject to enforcement action
pursuant to NCGS 143-215.6A.
Please reference the State assigned project number on all correspondence. Any original documents
that need to be revised have been sent to the engineer or agent. All original documents must be returned or
new originals must be provided. Copies are not acceptable. If you have any questions concerning this matter
please feel free to call me at [phone].
Sincerely,
��--
J X'u�
Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\000536.NN
cc: Linda Lewis
Mark Hargrove, P.E.
127 Cardinal Dr. Ext.,Wilmington,North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post-consumer paper

EWED
Eastwind Engineering Company, LLP
Engineering• Planners•Architects
t t t Princess St. P.O. Box 2628 Wilmington,North Carolina,28402 910-342-9144 FAX [phone]
May 18, 2000
Ms. Linda Lewis N a�
N.C. Department of Environment
and Natural Resources
Division of Water Quality Section
127 Cardinal Drive Extension V
Wilmington, NC 28405
Re: NCDWQ Permit for Long Leaf Mall Renovations
Wilmington, NC
Dear Ms. Lewis:
Items included that were previously not provided to you include:
• revised plans showing an infiltration system treating approximately 2 acres of drainage area
• storm water calculations for the infiltration system
• details of the infiltration system
• narrative describing the infiltration system
• two copies of soils report
Enclosed please find the following items:
• original completed storm water application for the referenced project and one copy
• $420.00 application fee
• two (2)copies revised plan sheets:
C-3 Demolition Plan, Phase I and 11, dated 5/9/00, revised 5/17/00
C-6 Dimensioned Layout and Paving.Plan—Phase I and 11, dated 5/9/00, revised 5/17/00
C-7 Utility Plan and Landscape Island Layout— Phase I and 11, dated 5/9/00, revised 5/17/00
C-8 Dimensioned Layout and Paving Plan—Phase I and II, dated 5/9/00, revised 5/17/00
C-9 Utility Plan and Landscape Island Layout—Phase I and 11, dated 5/9/00, revised 5/17/00
C-14 Miscellaneous Details, Phase I, II, and III, dated 5/9/00, revised 5/17/00
• one copy of C-4 w/new landscape islands highlighted showing reduction in impervious area
• Storm water narrative for redevelopment
The Long Leaf Mall Renovation project is being submitted for a redevelopment permit. The existing site is
25.17 acres. The current amount of imperviousness on the property is 24.02 acres. The renovations reduce
the amount of impervious area by 0.23 acres. Approximately 26 landscape islands are being added to the
parking lot to help reduce the amount of imperviousness. Storm water runoff will be directed to existing drop
inlets within the parking lot and to several new drop inlets that are connected to an existing piped system
beneath the parking lot on the southeast corner of the property.

Please feel free to call if you have any questions.
Very truly yours,
EASTWIND ENGINEERING COMPANY, LLP
Mark N. Hargrove, P.E.
cc: Jeffrey L. Zimmer—Zimmer Development
Frank T. Grzandziel—Zimmer Development
Rod Young—Zimmer Development

LAW ®
L. AWGIBB Group Mernberl®
April 17, 2000
Mr. Rod Young 118ZE C E IVEE D
Director of Planning and Pre-Development �`
Freestanding Retail Division
Zimmer Development Company MAY 1 8 2000
111 Princess Street
P. O. Box 2628 DWQ
Wilmington, North Carolina 28402 PROJ #
SUBJECT: REPORT OF INFILTRATION TESTING
PROPOSED LONG LEAF MALL EXPANSION
WILMINGTON,NORTH CAROLINA
LAW PROJECT NO. 31000-0-1373
Dear Mr. Young:
Law Engineering and Environmental Services, Inc. (LAW), is pleased to submit this report of our
subsurface exploration and hydraulic conductivity testing for your proposed Long Leaf Mall Expansion
in Wilmington, North Carolina. Our Services were provided in general accordance with LAW Work
Authorization dated April 11, 2000. The purpose of this work was to determine the drainage
characteristics of the soils in the proposed infiltration trench. The assessment of site environmental
conditions or the presence of contaminants in the soil, rock, surface water or ground water of the site was
beyond the scope of this exploration.
This report presents a review of the information provided to us, a discussion of the subsurface conditions.
and our test results.
PROJECT INFORMATION
General project information was provided by Mr. Young and Mr. Mark Hargrove in telephone
conversations on April 10 and April 14, 2000. We were provided a site sketch indicating the location of
the proposed infiltration trench.
A subsurface infiltration trench is planned in the area of the existing parking area to infiltrate stonnwater
from an approximately 2-acre drainage area. A 24 to 36 inch diameter concrete pipe will be installed in
the trench at a depth of 5 to 6 feet below existing grade.
FIELD EXPLORATION
Two hand auger borings were explored to depths of approximately 10 to 15 feet below existing grades in
the proposed trench location. The boring locations were selected and located in the field by LAW
personnel by taping distances and estimating right angles from existing site features. These locations
should be considered accurate only to the degree implied by the methods used. The approximate
locations of the borings are shown on Drawing No. I attached. Test boring records showing visual
descriptions of the soil strata encountered are also attached.
LAW Engineering and Environmental Services, Inc.
5710 Oleander Drive,Suite 110
Wilmington, NC 28403
910-452-1185•Fax [phone]

r.;
7itmner Development-Long Leaf Mall IR(Uration 04117100
[A al Project No.31000-0-1373 Page 2
In place hydraulic conductivity testing was performed in boreholes with a constant head permeameter.
Tests were run at approximately 6.5 and 7.8 feet below present grade.
The evaluation and recommendations presented in this report were developed from our interpretation of
the general subsurface conditions at the site based on information obtained from the soil borings. The
stratification lines indicated on the boring records represent the approximate boundaries between soil
types. The transitions may be more gradual in situ. Variations in soil conditions can also occur between
soil boring locations.
SUBSURFACE CONDITIONS
The hand auger borings performed generally revealed approximately 1.5 to 1.75 inches of asphalt and six
inches of aggregate base course. Underlying the stone base course, sands with variable amounts of silt,
were encountered to approximately 6 feet. At approximately 6 to 7.5 feet, clays were encountered with
variable amounts of fine sand. Underlying the clays, clean sands were encountered to boring termination
depth. Groundwater was not encountered in hand auger borings.
INFILTRATION TESTING
The depths of permeameter testing were 6.5 and 7.8 feet below present grade as discussed with Mr.
Hargrove. The test run at 6.5 feet represents the sands overlying a clay layer and the test performed at
7.8 feet represent sands underlying a clay layer. Test results indicate hydraulic conductivity values of
1.9x10-' cm2/sec for the sands overlying the clay layer and approximately 1.9x102 cm2/sec for the sands
underlying the clay layer. The test results for the deeper sands are approximate due to the depth below
grade and the rapid infiltration limiting the allowable static head height.
The test results indicate good drainage characteristics of the in place sands; however, the clay layer
encountered from approximately 6 to 7.5 feet will impact infiltration in the proposed area. As discussed
with Mr. Hargrove, the clay material encountered may be overexcavated and replaced with sand or stone
fill during trench construction.
We are available to discuss our results with you and to provide additional studies or services necessary to
complete the project. We appreciate the opportunity to be of service to you in the subsurface exploration
phase of this project and are prepared to assist you during the construction phases as well. If you have
any questions concerning this report or any of our testing, inspection, design and consulting services,
please do not hesitate to contact this office.
Sincerely,
LAW ENGINEERING AND ENVIRONMENTAL SERVICES, INC.
T. Carter Hubard, P.E. Daniel C. Shields, P.E.
Senior Engineer Principal Engineer
TCH/DCS
LAW
/-\ ENGINEERING AND ENVIRONMENTAL SERVICES
57111(II andc'I )nI e.Ville Ill,,w11111111E11+n,NC 2xv3

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REF:SITE DRAWING BY EASTWIND ENGINEERING
BORING LOCATION PLAN DRAWN: `LG6j DATE: 4114/00
LONG LEAF MALL I A W DFT CHECK: SCALE: N.T.S.
WILMINGTON, NC ENG CHECK. JOB#: 31000-0-1373
ENGINEERING AND ENVIRONMENTAL SERVICES,INC,
APPROVAL: DWG#: 1

LAW ENGINEERING AND 5710OLEANDER DR.
ENV]RON MEN'r AL SERV ICES,INC. SUITEI IO
WILMINGTON.NG 2MO3
- ' [phone]
LOG OF BORING
PROJECT NUMBER: 31000-0-1373 PROJECT NAME: Longleaf Infiltration
BORING NUMBER: Infil.41 COORDINATES NA
ELEVATION: NA GWL: Not Detected
GEOLOGIST/ENGINEER: Caner Hubard DATE STARTED: 4113/00
DRILLING METHODS: Hand Auger DATE COMPLETED: 4113/00 PAGE 1 OF 1
SAMPLE BW RECOVERY DESCRIPTION uses REMARKS
DEPTH BLOWSI IINI SYMBOL
ITT) 11'
(0-1.5 in.)Asphalt
(1.5in-8 in)Base course stone
(3.5-4.5 Of Frim moist gray silty fine SAND ISM) SM
-1
.2
-3 _
(3.5 4.5 n.j 02nge to white moist line SAND with some clay
Sc
-4
(4.5-6 ft.)Firm orange wet clayey fine SAND
-5
-6 6-7.5 ray wet sandy CLAY(C CL
.7
(7.5-8.5) Orange moist fine SAND(SP) SP
-8
Boring terminated at 8.5 feet
-9 -
-10
NOTES:
No groundwater was encountered

LAW ENGINEERING AND 5710 OLEANDER DR.
ENVIRONMENTAL SERV ICES,INC. SUITETIO
WILMINGTON,NO 2e403
-- [phone]
LOG OF BORING
PROJECT NUMBER: 31000.0-1373 PROJECT NAME: Lon leaf lntiltratlon
BORING NUMBER: Infll.M2 COORDINATES NA
ELEVATION: NA GWL: Not Detected
GEOLOGIST/ENGINEER: Carter Hubard DATE STARTED: 4114100
DRILLING METHODS: Hand Auger DATE COMPLETED: 4/14/00 PAGE 1 OF 1
SAMPLE DCP RECOVERY DESCRIPTION uses REMARKS
DEPTH BLOWS\ (IN) SYMBOL
n 34.
(0-1.75 in.)Asphalt -
(1.75in-7.75 in)Base course stone
SO
-1 Firm moist gray fine SAND(SP)
-becomes orange with little to trace sill
-2
-3
.4
-S
-6
--_.-----___---_-----_---_--__-_
(6.5-6.75 It)Gray moist clayey fine SAND(SC) SC -
-7 (6.75-7 ff)Gray sandy CLAY(CL) CL
(7-15 N)Yellow,orange line SAND(SP) SP -
-8
.g
-10
NOTES: Bonng Terminated at 8.5 feet
No groundwater encountered