SW8970921_HISTORICAL FILE_19990505 (3)

STORMWATER DIVISION CODING SHEET
POST -CONSTRUCTION PERMITS
PERMIT NO.
SW8 OI-1 O q 21
DOC TYPE
❑ CURRENT PERMIT
❑ APPROVED PLANS
HISTORICAL FILE
❑ COMPLIANCE EVALUATION INSPECTION
DOC DATE
0 5 015
YYYYMMDD
i

Stat jof North Carolina
j)epartment of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
May 5, 1999
Mr. Louis Lee, W WTP Exp. Program Manager
KoSa
PO Box 327
Wilmington, NC 28402-0327
Subject:
Dear Mr. Lee:
IT 0
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCeS
Permit No. SW8 970921
W WTP Expansion
High Density Stormwater Project
New Hanover County
'file Wilmington Regional Office received the Stormwater Management Permit Application for WWTP Expansion on
September 18, 1997, with final information on February26, 1999. Staff review ofthe 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 970921 dated May 5, 1999, for the construction of W WTP Expansion.
This permit shall be effective from the date of issuance until May 5, 2009, 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 2761 1-7447. Unless such demands are made this permit shall
be final and binding. I
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\PERMI"R97092LMAY
cc: R. Kay Littlefield, P.E.
'Pony Roberts, New Hanover County Inspections
Beth Easley, New Hanover County Engineering
Linda Lewis
t Wilmington Regional Office
Central Files
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
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State Stormwater Management Systems
Permit No. SW8 970921
STATE OF NORTH CAROLINA
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
DIVISION OF WATER QUALITY
STATE STORMWATER MANAGEMENTPERMIT
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
KoSa
WWTP Expansion
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 "stornnvoter rides') and the approved stornnvater 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 May 5, 2009 and shall be subject to the following specified
conditions and limitations:
I. DESIGN STANDARDS
I . 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 a 3.5" storm
event.
3. The project proposes 55,757 square feet of impervious area. The tract will be limited to the amount of built -upon area
indicated on page 3 of this permit, and per approved plans
4. Approved plans and specifications for this project are incorporated by reference and are enforceable parts of the
Permit.

State Stormwater Management Systems
Permit No. SW8 970921
DIVISION OF WATER QUALITY
PROJECT DESIGN DATA SHEET
Project Name:
Permit Number:
Location:
Applicant:
Mailing Address:
Application Date:
Water Body Receiving Stormwater Runoff:
Classification of Water Body:
If Class SA, chloride sampling results:
Control System:
Basin Depth, feet:
Bottom Elevation, FMSL:
Total Impervious Surfaces, ft2:
Offsite Area entering Pond, ft2:
Required Storage Volume, ft':
Provided Storage Volume, ft':
Temporary Storage Elevation, FMSL:
Seasonal High Water Table Elevation:
Type of Soil:
Expected Infiltration Rate:
Drawdown Time:
W WTP Expansion
SW8 970921
New Hanover County
Mr. Louis Lee, WWTP Exp. Program Manager
KoSa
PO Box 327
Wilmington,NC 28402-0327
September 18, 1997
Cape Fear River (CFR 18-71)
"C Sw"
n/a
Infiltration Basin
16
55,757
none, per Engineer
16,078 (The system infiltrates faster than it rains.)
3,730
17
4 FMSL
Leon Sands
20" per hour
0.7 hours
3

State Stormwater Management Systems
Permit No. S W 8 970921
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 except roads.
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 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 of DWQ.
The records will indicate the date, activity, name of person performing the work and what actions were taken.
5. 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.
6. 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.
7. 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.
8. 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.
9. 'rhe permittee is responsible for verifying that the proposed built -upon area does not exceed the allowable built -upon
area.
10. The runoff from all built -upon area on the project must be directed into the permitted stormwater control system.
11. 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.

State Stormwater Management Systems
Permit No. SW8 970921
12. 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.
e. Further subdivision of the project area.
f. Filling in, altering, or piping of any vegetative conveyance shown on the approved plan.
In addition, the Director may determine that other revisions to the project should require a modification to the permit.
13. 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.
III. 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 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.
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.
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 pernittec 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.
Permit issued this the 5th day of May, 1999.
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
Kerr. T. Stevens, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number SW8 970921

State Stormwater Management Systems
Permit No. SW8 970921
WWTP Expansion
Stormwater Permit No. S W 8 970921
New Hanover County
Engincer's Certification
I, , as a duly registered Professional Engineer in the State of North Carolina,
having been authorized to observe (periodically/weekly/full time) the construction of the 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.
Noted deviations from approved plans and specification:
SEAL
Signature
Registration Number
Date

DIVISION OF WATER QUALITY
NORTH CAROLINA STORMWATER MANAGEMENT PERMIT APPLICATION
I. GENERAL INFORMATION
(please prior clearly ar type)
1. Project Name Hoechst Celanese Wastewater Treatment Plant Expansion
2. Location, directions to project (include County, Address, State Road) Attach map.4600 Hwy. 421 North
Yn New Hanover Countv
/trfeV2 ] al pes 'z OX.1.
3. Owner's Name__ Hoe, l,ffese db2 KoSa
4.Owner's Mailing Address
City Wilmington State
S.Nearest Receiving Stream Northeast Cape Fear River Class
6.Projecttiescription Extension of
I. PERMIT INFORMATION
1. Permit No.(IbbefiuedinhyDVVQ)­_,S
2_ApplicationDate 10/14/97
910/341-5500
NC �;- 28402
and construction of tanks
Feeenclosed$ 225.00
3-PermitType: X
New
Renewal
Modification (existing Permit No.)
4. Project Type: _Low
Density
_Detention X
Infiltration_Redevelop_General_Alter_Offsite
5. Other State/Federal Permits/Approvals Required (Check appropriate blanks)
CAMA Major Sod imentation/Erosion Control X 404 Permit
III. BUILT UPON AREA (Pleat, see NGC 2H.100S ,lino .1007for apptical)le densitylionia)
Classification
Existing Built -upon Area
Proposed Built -upon Area
Total Project Area
% Built -upon Area
Drainage Drainage
Basin Basin
Csw
0 ac.
i.a$ 8-73 ac.
2•?3 +-.-'R-ac.
4✓* 15 /as
o
IV. STORMWATER TREATMENT (Describe how the nmafg ill be treated)
Infiltration
Breakdown of Impervious Are
(Please indicate below the design impervima area)
Buildings 0.37 ac.
Streets , _ -9:36 ac. 0,5i
Parking/S W
Xn
Totals 1.;8 8 73 ac.

u
VI.
DEED RUYFRICTIONS AND PROTECTIVE COVENANTS
Deed restrictions and protective covenants are required to be recorded for all low density projects and all
subdivisions prior to the sale of any lot. Please see Attachment A for the specific items that must be recorded
i for the type of project applied for.
By your signature below, you certify that the recorded deed restrictions and protective covenants for this project
shall include all the items required by the permit, that the covenants will be binding on all parties and persons
claiming under them, that they will run with the land, that the covenant cannot be changed or deleted without
concurrence from the State, and that they will be recorded prior to the sale of any lot.
OWNER'S CERTIFICATION
I, Louis E. Lee certify that the information included on this permit
(please print clearly or type) '
application form is correct, that the project will beconstructedin conformance with the approved plans, that
the deed restrictions will be recorded with all required permit conditions, and that to the best of my knowledge,
the proposed project complies with the requirements of 15A NCAC 2H.1000.
I authorize the below n ed/pers3w,-9r firm submit stormwater plans on my behalf.
O ner/Authorized Ag nt hgnature and Title Date
VII. AGENT AUTIIO ZATION (Please fill in dle name of the engineer/surveyor awhorced to submit plalu on the owner's belwlf.)
Person or firm name McKim & Creed Engineers, P.A.
Mailing Address 243 North Front Street
City Wilmington State NC Zip 28401 Phone [phone]
Please submit application, fee, plans and calculations to the appropriate Regional Office.
cc: Applicant/NiRO//Central Files
n E C E 1 V E D
OCT 151997
D E M
PROJ #
Office use only
C E I
<VE
D
N -_

pECEIVED STOR l ATER p CE E�,`
OCT 151997 D INFILTRATION POND MAINTENANCE 181997
D E M D
PROJ p PR J A
Project Name: Hoechst Celanese Wastewater Treatment Plant Expansion
Responsible Party Name: Louis E. Lee - Hoechst Celanese
Address: 4600 Hwy. 421 North, Wilmington. NC 28401 Phone No. 910/341-5500
After every runoff producing rainfall event, or at least monthly, whichever comes first:
1. Inspect the infiltration pond(s) for erosion, trash accumulation, grass coverage, and
general condition of the facility.
2. Repair eroded areas immediately, re -seed as necessary, keep side slopes and bottom
mowed, and remove trash. ' '
3. Check any inlet piping, swales and catch basins. Repair broken piping, re -seed swales,
and remove trash.
4. Inspect the bypass/overflow structure for blockage and deterioration. Remove
blockage and repair structure to originally approved design specifications.
5. Check the depth of the pond(s) every six months. If siltation has occurred to the point
that only 75% of the original design depth is provided, remove the excess silt to the
original depth. Do not over -excavate, as this may cause the required water table
separation to be reduced, and may affect the ability of the system to perform as
designed.
SPECIAL REQUIREMENTS
I, Louis E. Lee , agree to be responsible for performing the maintenance items as
listed above for this project. I agree to notify NCDWQ of any problems with the system, or
changes of the name of the project, name of the responsible party, or address.
Signature
f
L Date - �-
/ y�

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
April 5, 1999
Mr. Louis Lee
Arteva Specialties, S.a.r.1., dba KoSa
PO Box 327
Wilmington, NC 28402
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCEs
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 970921
WWTP Expansion
New Hanover County
Dear Mr. Lee:
The Wilmington Regional Office received previously requested information for the Stormwater
Management Permit Application for the WWTP Expansion on March 10, 1999. 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. Only the revised application was received. Plans with the required revisions were not
received. Please send in the revised plans.
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 May 5, 1999, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee. The Division is allowed 90 days from the receipt of a completed application to issue the
permit.
The construction of any impervious surfaces associated with this project prior to receipt of the
stormwater permit is considered a violation of NCGS 143-215.1, and is subject to enforcement action.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\970921.APR
cc: Linda Lewis
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal opportunity Affirmative Action Employer 50 % recycled/10% post -consumer paper

-.Ko§5
Certified Mail # P 306 605 417
March 5, 1999
LI,13-99-018
RECEIVED
MAR 10 1999
BY:
Ms. Linda Lewis
Division of Water Quality
North Carolina Department of Environment and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
Subject: Additional Information - Revised Application Form
Stormwater Project Number SW8 970921
Dear Ms. Lewis:
As we discussed in our telephone conversation on March 5, 1999, enclosed is the revised
stormwater permit application form for our Wastewater Treatment Plant Expansion Project
(Stormwater Project Number SW8 970921). Should you have any questions, please feel free to
call Mr. Louis Lee at [phone] or me at [phone].
Sincerely,
Lisa L. Gideon, E.I.T.
Environmental Engineer
attachments
cc: Mr. Louis Lee
Larry Jolt (w/out attachments)
EH&S File # 36-005-07
P.O. Box 327 4600 Highway 421 North [phone]
Wilmington, NC 28402-0327 Wilmington, NC 28401 www.kosa.com

KoS9
February 25, 1999
LI,G-99.016
Ms. Linda Lewis
Division of Water Quality
North Carolina Department of Environment and Natural Resources
127 Cardinal Drive Extension
Wilmington, North Carolina 28405
Subject: Additionallnformation
Stormwater Project Number SW8 970921
Dear Ms. Lewis:
Enclosed are three (3) copies of the revised drawings with the requested additional information.
Should you have any questions, please feel free to call Mr. Louis Lee at [phone] or me at
[phone].
Sincerely,
Lisa L. Gideon, E.LT.
Environmental Engineer
attachments
cc: Mr. Louis Lee (w/out attachments)
Larry Job (w/out attachments)
EFI&S File # 36-005-07
D
E C E I V E
FEB 2 6 1999
D E M
PROD #
P.O. Box 327 4600 Highway 421 North [phone]
Wilmington, NC 28402-0327 Wilmington, NC 28401 www.kosa.com

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
January 29, 1999
Mr. Louis Lee
WWTP Expansion Program Manager, KoSa
PO Box 327
Wilmington, NC 28402-0327
Dear Mr. Lee:
`�� ��o
NCDENR
NORTH CAROUNA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 970921
WW.TP Expansion
Brunswick County
The Wilmington Regional Office received previously requested information for the pending
Stormwater Management Permit Application for WWTP Expansion on January 11, 1999. 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. It appears that a new road has been added to the plan. Please revise the application to account
for this increased impervious area, and revise the calculations to account for the increased
runoff. Please label the proposed high side and low side spot elevations for this road.
2. To what side of the road will the runoff be directed? The detail suggests that the runoff will
be directed to the outside, but it is not clear how it will be collected and drained into the
infiltration pond from there, since no ditches or swales are shown.
3. Please have an engineer seal the plans.
4. Please revise the plan's construction limits to include the new road.
5. Please provide additonal proposed spot elevations for the road. Since the section detail
indicates one continuous cross slope, please label the proposed elevations for both the high
and low sides of the road at intervals of say 100'. You may also elect to provide a road
profile.
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10°/ post -consumer paper

Mr. Lee
January 29, 1999
Stormwater Project No. SW8 970921
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 March 1, 1999, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee. The Division is allowed 90 days from the receipt of a completed application to issue the
permit.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\970921.JAN
cc: Linda Lewis
Central Files

20'
fi
PROP(
J
A
/
/

KoSa
Wilmington, N. Carolina
State of North Carolina
Department of Environment
and Natural Resouces
Wilmington Regional Office
127 Cardinal Drive Ext.
Wilmington, N. Carolina 28405
Attention: Ms. Linda Lewis
Environmental Engineer
Dear Ms. Lewis:
RECEIVED
LJAN 1 1 1999
BY:�-
Stormwater Permit Application W WTP Expansion
Stormwater Protect No.SW8 970921
December 18, 1998
Attached please find two (2) copies of our drawing 5560-5I004-5-C, Stormwater Control Plan, for the
W WTP Expansion project at the Wilmington KoSa (formerly Hoechst Celanese) plant. In accord with our
conversation, it is based on sloping the boundary service road so that stormwater is retained within the
facility; and with any accumulation that does occur being directed toward an infiltration basin located to the
northeast.
If there are any additional clarifications or information needed, please let me know by communicating
directly to me at the address below.
Thanks for your assistance.
f
x ansion Program Manager
PO Box 327
Wilmington, N. Carolina 28402-0327

State of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
Mr. Mike McAllister
McKim and Creed
5625 Dillard Road, Suite 117, Building 1
Cary, NC 27511
Subject:
Dear Mr. McAllister:
STUM _�'
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOUROES
April 9, 1998
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 970921
Hoechst Celanese WWTP Expansion
New Hanover County
The Wilmington Regional Office received previously requested information for the Stormwater
Management Permit Application for Hoechst Celanese WWTP Expansion on February 25, 1998. A
preliminary review of that information has determined that the application is not complete. The following
information is needed to continue the stormwater review:
I don't know how to make this any clearer. You must show sufficient grading in the form of
existing and proposed contours and spot elevations in order to receive this permit. The runoff
from all impervious areas of the project must be collected and directed into the stormwater
system. The grading as shown is still not sufficient to determine how the runoff from the
impervious areas will be directed into the system. Please don't brush this off. This is a state
required PERMIT that the applicant as applied for. If you're not serious about taking care of
this, please let me know so that I can return the package to the applicant and they can start
all over again from the beginning.
2. Does the road have roadside ditches which will collect the runoff? How is the road graded?
Does it have a normal crown section, a reverse crown, or a continual slope from one side to
the other? By adding elevations to the road, you can show how it is to be graded, and how
runoff will be collected and sent to the pond.
Does the runoff enter the infiltration basin at a single point, or does it just sort of sheet flow
on over that way? Please draw in on the plans how runoff will get into the basin.
4. For all submittals, two (2) sets of plans are required. Only 1 was sent.
127 Cardinal Dr. Ext., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
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Mr. McAllister
April 9, 1998
Stormwater Project No. SW8 970921
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 May 9, 1998, or the application will be
returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\970921.APR
cc: Linda Lewis
Central Files
127 Cardinal Dr. Est., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

FEB 23 '98 02:22PM MCKIM 8 CREED WILM.
P.1/6
v MgM4&CREED
1' .1 I ..
243 NORTH FRONT STREET
WILMINGTON, NC 28401
TEL: [phone]
FAX: [phone]
J
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REV. - 02/10198

February 24, 1998
Ms. Linda Lewis
N.C. Department of Environmental Health
and Natural Resources
Water Quality Section
127 Cardinal Drive
Wilmington, North Carolina 28405-3845
RE: Hoechst -Celanese Storm Water Permit
# SW8 970921
Dear Ms. Lewis:
The following is in response to your letter dated January 26, 1998:
1. A copy of the soils report is enclosed for your review.
2. Swales have been added around the perimeter of the disturbed areas to direct flow
towards the infiltration basin.
3. The note regarding wetlands that is currently shown on the plans is in error. There are
no wetlands on this site. The note has been corrected.
4. The appropriate drainage area has been shown as requested.
If you have any more questions regarding this, please contact us.
Sincerely,
McKIM & CRE -D ENGINEERS, P.A.
Michael L. McAllister
/der
Enclosure
F: CLERICAL1009T002111M02248m1m, doc 1i
5625 DILLARD DR., SUITE 117, CARY, NORTH CAROLINA 27511
TEL [phone] FAX [phone] www.mckimcreed.com

FETE 23 '98 07� 23PM MCKIM & CREED WILM.
MAY-22-8 13.01 rk n, a'esn1:•-naw.+a....
May 21, 1997
McKim & Creed Engineers
243 North Front Street
wumington, North Carolina 29401
Attention: Mr. Jeff Samuel, P.E.
Reference: Geotechnical Report
Proposed Expansion
Hoechst Celanese Plant
Wilmington, North Carolina
Job No. 1063-97-205
Dear Mr. Samuel:
IO.9107850 1/12
(J ❑FP:Zi6
STO q II tl1U11/p1TER
D
E C E I V E
FEB 2 51998 D
PRoJ» w 47G92
S&ME, Inc. has completed ,the authorized geotechnical study at the proposed
expansion site located at the existing Hoechst Celanese plant neat Wilmington, North
Carolina. Subsurface conditions at the site were investigated with four test borings which
were drilled at the approximate locations shown in Figure 1. The boring locations had been
staked in the field by others prior to the drilling crew's arrival on site. Each boring was
drilled to a depth of 30 feet below the existing ground surface, and soil samples were
obtained by the standard penetration test method (ASTM D-1586) to'determine the
consistency of the subsurface soils.
This report presents the findings of our investigation with recommendations
for support of the proposed structures based on these findings.
We understand that the proposed expansion will include the construction of
a Flare Stack, a Cooling Tower, an Anaerobic Reactor, and an Equalisation Tank. The
Flare Stack, Cooling Tower, and Anaerobic Reactor will be supported by mat foundations
designed for a soil contact stress of 3000 pounds per square foot (psf), whereas the 100-foot
diameter Equalization Tank will bear on a concrete ring wall designed for a soil contact
stress of 2000 psf. The soil contact stress beneath the 30-foot bigh Equalization Tank will
also be about 2000 psf.
We have assumed that final site grades will not vary from existing site grades
by more than one to two feet-
frr�� s&nr_ Inc 6d09 Amverdarn doy. (Wilding (3. wIIMNron, North Core lho 28405. [phone]. Fox [phone]

4FEB 23 +'98 &2L7��PM MCKIM & CREE�D-WILM. tD=sre799k966 2i12
M14 Y-24-a� aaoa r r .0 u.... q-••-•
McKim tit Creed Engineers
May 21, 1997
Page 2 „
The subsurface soils encountered at the test boring locations generally
consisted of medium dense to dense dean sands which extended to the completed boring
depth of 30 feet. At Boring No. B-2, though, loose clean sands were noted from a depth
of approximately 18 feet to the completed boring depth of 30 feet.. the medium dense to
dense sands exhibited standard penetration resistance values ranging from 13 to 40 blows
per foot, whereas the loose sands at Boring No. B-2 had penetration resistance values in the
5 to 9 blows per foot range.
Groundwater was noted during the drilling operations at depths ranging from
approximately 12 to 14 feet below the existing ground surfhce. The site groundwater level
will fluctuate with climatic and seasonal changes, however, and may be higher at other times
of the year.
A generalized subsurface profile, which has been prepared from.the subsurface
data to graphically illustrate the subsurface conditions encountered at the test borings, is
attached to this report as Figure 2. Variations from the generalized subsurface profile
described above and a more detailed description of the subsurface conditions are presented
in the attached Test Boring Records.
RECOMMENDATIONS
_ This report has been prepared in accordance with generally accepted
geotechnical engineering practice for specific application to this project. The conclusions
and recommendations contained in ibis report.are based upon applicable standards of our
practice in this geographic area at the time this report was prepared_ No other warranty,
express or implied, is made.
_ The analyses and recommendations submitted herein are based, in part, upon
the data obtained from the subsurface exploration. The nature and extent of variations
between the borings will not become evident until construction_ If variations appear evident,
then we will re-evaluate the recommendations of this report. In the event that any changes
in the nature, design, or location of the building are planned, the conclusions and
recommendations contained in this report will not be considered valid unless the changes
are reviewed and conclusions modified or verified in writing.
S&ME, roe.
6a09 AMc=d= Wry, Mdg. B•3
Wik�, Nord, Cwot= 2840

HAY-22-978 13,02e PRON451Yr1faCKI_n RnEtiuviLM' ID�9107B95B pP. 4/6 3/12
McKim & Creed Engineers
May 21, 1997
Page 3
We strongly recommend that S&ME be provided • the opportuaity to review the
final design plans and specifications m order that earthwork and foundation
recommendations are properly interpreted and implemented -
Lon Support. Following site preparation as discussed below, the
proposed st rttcrures can be supported on shallow foundations designed for a soil contact
pres=e of 3000 psf. All shallow foundations should bear at least 12 inches below exterior
.grade to develop this allowable foundation bearing pressure.
The results of our settlement analysis indicate that the proposed structures
would experience the following estimated foundation settlements for the anticipated loading
conditions:
Foundation Estimated Settlement (Inch.)
truce Laadigg R_X Diffarond
' Flare Stack 3000 psf on a 1/244
10' x 10' mat
Cooling Tower 3000 psf on a 1'h-2 ya-1
40' X 40' mat
Anaerobic 3000 psf on a llh-2
Reactor 95' diameter mat
Equalization 2000 psf over a 13'a-2 yd-1
Tank 100' diameter
rank footprint
The estimated foundation settlements presented above should be relatively
broad -based and should be within tolerable limits for the proposed structures based on our
past experience; however, this should be confirmed by the project structural engineer.
Our past experience also shows that the majority of the anticipated tank
seitlements will occur when the tanks are proof filled with water. On this basis, we
recommend delaying permanent connection of the piping until after the proof fMing of the
tanks. Provided the tank connections are designed to tolerate up to two inches of
movement, we do not expect that future settlements would cause damage to the piping
connections.
sw'a, IUC_
609 A==dsm way. skit. 0-3
vrdmmg= Norm Caratam 2W5

FEB ?� '98 �?� 24PM,MSKIM & CREED WILM. ID,91e7989959 iP.5i6 4/12
MAY22—a i . ...._. _
McKim 8a Creed Engineers
May 21, 1997
Page '4
We recommend that the mat foundations be designed for an assumed subgrade
modulus value of. 175 pounds per square inch per, inch.
Site Preoarati�lto . Site preparation should be initiated by stripping the
proposed construction area of any roots, organics, or other unsuitable foundation -supporting
material- In addition, any underground . utilities located beneath the proposed sttuertues
should be relocated.
After the required site stripping work has been completed, we recommend that
the exposed subgrade sands be proofrolled with a 10-ton vibratory steel -wheeled roller to
densify the exposed sands and to locate any areas of soft or otherwise unsuitable surface
conditions. Any area which pumps or ruts excessively should be underact and replaced with
a granular structural backfill as described below.
Where structural fill is required to reach finished grade, we recommend that
a dean, slightly silty, or slightly clayey sand having a Unified Soil Classification of SP. SP-
SM, or SP SC be used. The fill should be placed in 6 to 8-inch thick lifts and should be
compacted to at least 95 percent of the standard Proctor maximum dry density (ASTM
D-698); however, the compaction of the upper 12 inches of subgrade should be increased
to at least 98 percent of the standard Proctor maximum dry density. To confirm that the
specified degree of compaction is being obtained, field density testing should be performed
in each fill lift by a soils technician- At those areas where no structural fill is placed on site,
we recommend that the upper 12 inches of the in -place subgrade materials be compacted
to at least 98 percent of die standard Proctor maximum dry density -
If base course stone is placed as structural fill at the location of any of the
proposed structures, we recommend that the base coarse stone be placed in loose lifts not
exceeding 6 inches and be compacted to at least 98 percent of the modified Proctor
maximum dry.density (ASTM D-1557).
In order to verify that the soils 0=11111acd in the foundation excavations are
similar to those encountered in the soil test borings, we recommend that all footing subgrade
surfaces be evaluated by an experienced soils technician or engineer using a dynamic band
cone penetrometer prior to concrete piacemetiL The purpose of this testing is to confirm
that the foundation subgrade soils consist of suitable bearing material- The foundations
should be constructed as soon as possible after any excavation has been completed to
prevent degradation of the exposed soils due to inclement weather.
S&ME, lea
"M /modem way. Bldg- 33
VrAmmgtoo, tiol* r-rolima 2840

FsEB 23 198 82:25PM MCKIM & CREED WILM. In.s10799�95e E?:6�6 . 5/12
MAY�22- 7 13.03 i'k'UM.90nc �a-nanv avn
McKim & Cmed Eagmeers
May 21, 1997
Page 5
Miscellaneous Conside 'ons. All excavations should be sloped or shored in
accordance with applicable local, state, and federal regulations, including OSHA excavation
trench safety standards.
S&ME appreciates having the pppornmity to be of service to you during this
phase of the project. If you have any questions or comments after reviewing this report, or
if we can be of additional service to you, please do not hesitate to contact us at your
convenience.
SDK:MWB/ins
Attachments
very truly yours,
S&ME, INNC.
Steven D. Kc Y, P�E.
N. C. Registration No. 17638
Michael W. Behen, P.E.
N.C. Aegisn'ation -No. 9384
S&ME, 7aa
6409 wMSada® WRY. Bide. &3
Wamb2L t Norte Carol= 2UOS

State.of North Carolina
Department of Environment
and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr., Governor
Wayne McDevitt, Secretary
Division of Water Quality
January 26, 1998
Mr. Micheal McAllister
McKim and Creed
5625 Dillard Road, Building 1, Suite 117
Cary, NC 27511
4�/_�'
NCDENR
NORTH CAROLINA DEPARTMENT OF
ENVIRONMENT AND NATURAL RESOURCES
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 970921
Hoechst Celanese WWTP Expansion
New Hanover County
Dear Mr. McAllister:
The Wilmington Regional Office received a Stormwater Management Permit Application for Hoechst
Celanese WWTP Expansion on November 24, 1997. 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. The "soils report" provided is merely a collection of boring logs. No written conclusions as
to the elevation of the seasonal high water table, the type of soil, or the expected infiltration
rate was provided. Please have S&ME provide you with the written summary of these
conclusions, and forward a copy to this Office.
2. If no grading is to be done for the site, then how is the runoff supposed to drain to the
infiltration area? You MUST provide sufficient grading to direct the runoff from the proposed
impervious areas into the infiltration area. This grading must be demontrated on the plans,
per the requirements of NCAC 2H.1003(g)(4) through contours, fmished spot elevations,
swale centerline elevations, finished floor elevations, road centerline elevations, etc.
3. The note on the plans says that wetlands are located within the disturbed boundaries. Please
delineate these wetlands, as previously requested.
4. The plans submitted DO NOT show the specific drainage area boundary for this infiltration
system. Please clearly delineate it by drawing a line on the plans that accurately represents
the drainage area to this system. You will need existing and proposed contour information to
do this correctly .
127 North Cardinal Dr., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10% post -consumer paper

Mr. McAllister
January 26, 1998
Stormwater Project No. SW8 970921
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 February 26, 1998, or the application will
be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
RSS/arl:
cc:
Sincerely, ® t
Ms. Linda Lewis
Environmental Engineer
S:\WQS\STORMWAT\ADDINFO\970921.JAN
Linda Lewis
Central Files
127 North Cardinal Dr., Wilmington, North Carolina 28405 Telephone [phone] FAX [phone]
An Equal Opportunity Affirmative Action Employer 50% recycled/10°/ post -consumer paper

ENGINEERS
SURVEYORS
ARCHITECTS
PLANNERS
SUITE 117
BUILDING 1
5625 DILLARD ROAD
CARY, NC 27511
PHONE [phone]
FAX M033-8031
November 19, 1997
Ms. Linda Lewis
N.C. Department of Environmental Health
and Natural Resources
Water Quality Section
127 Cardinal Drive
Wilmington, North Carolina 28405-3845
RE: Hoechst -Celanese Storm Water Permit
# SW8 970921
Dear Ms. Lewis:
24 1997
M&C 0097-0021.OW
This is in response to your letter dated October 24, 1997, and are addressed in
order:
1. A check for the additional amount of $160.00 is enclosed.
2. A copy of the soil boring logs for this site are provided.
3. Note that the existing contours are shown. No grading is proposed for
this site. Except for the infiltration basin itself, spot elevations have been
provided there. All drainage to the infiltration basin is by sheet flow;
therefore, the basin was placed in the lowest point within this small
drainage basin.
4. A note has been added to the set of plans stating no wetlands exist.
5. The drainage area to this basin has been delineated.
6. A copy of sealed design calculations are enclosed.
7. A section detail of the basin has been provided.
8. The basin can absorb the entire 25-year storm in 3 hours or 2.67 in/hr.
See calculations.
9. Dimensions have been provided as requested.
If you should have any additional comments or questions, please call me.
Sincerely,
McKIM & CREED ENGINEERS, P.A.
Michael L. glister
Enclosures
F:ICLERICALIO➢9710021110111177m1m.doc

P-
E$onmentpE
Engineering r Testing

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Environmental
Engineering a Testing

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E onmen ees
Enpineerinp w Testlnp

Page: rolr *$
onmm�teE
Englneering r Testing

a
State of North Carolina
Department of Environment and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. Division of Water Quality Wayne McDevitt
Governor Water Quality Section Secretary
October 24, 1997
Mr. Mike McAllister
McKim and Creed
5625 Dillard Road, Suite 117, Building 1
Cary, NC 27511
Subject: ACKNOWLEDGEMENT OF RECEIPT AND
REQUEST FOR ADDITIONAL INFORMATION
Stormwater Project No. SW8 970921
Hoechst Celanese WWTP Expansion
New Hanover Comity
Dear Mr. McAllister:
The Wilmington Regional Office received a Stormwater Management Permit Application for Hoechst
Celanese WWTP Expansion on September 18, 1997. A preliminary review of that information has
determined that the application is not complete. The following information is needed to continue the
stormwater review:
f 1'. Infiltration systems are considered high density, and the fee for their review is $385.00.
Please remit the balance of $160.00.
�( 2. Provide a copy of your soils evaluation, including the type of soil, the elevation of"the
Seasonal High Water Table, and the expected infiltration rate.
3. Please show the proposed contours, grading, and spot elevations so that I can verify the
drainage.
4. Delineate all wetlands on site, or note on the plans that none exist.
5. Please delineate the drainage area to this basin, including any offsite areas that cannot be
routed around the system.
6. Please seal the design calculations.
127 Cardinal Drive Extension, Wilmington, N.C. 28405-3845 • Telephone [phone] • Fax [phone]
An Equal Opportunity Affirmative Action Employer

Mr. McAllister
October 24, 1997
Stormwater Project No. SW8 970921
7. Please provide a section detail of the basin, indicating the bottom elevation, design storage
elevation, and top elevation..
8. How will the basin function in response to a very intense storm of short duration? Say, on the
order of 1" per hour falling for 2 hours or more, as is typical in this area. The basin must be
able to store the difference between what is infiltrated and how fast it rains.
9. Provide dimensions for the tank and building areas and the road cul-de-sac radius.
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 November 24, 1997, or the application will
be returned as incomplete. The return of a project will necessitate resubmittal of all required items, including
the application fee.
If you have any questions concerning this matter please feel free to call me at [phone].
Sincerely,
Ms. Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\ADDINFO\970921.00T
cc: Linda Lewis
Central Files
2

E-2
LETTER OF TRANSMITTAL
I
TO: 1V6 /) g/.lN.0
% :� o v fcb%aunt o ce
r '�l // 1 1 A✓� 1 ('
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PROJECT NO:
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TASK NO,
RE'.
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510 Ki+ ttJ iErt P, 77"
MANSMM`AE NO: TRANSMIT
PAGE 1 OF
WE ARE SENDING: ❑ Originals ❑ Prints ❑ Shop Drawings ❑ Samples
❑ Specifications ❑ Calculations ❑ Other -
Quantity
Drawing No.
Rev.
Description
Status
1
Issue Status Status Code: A.
Preliminary B.
Fabrication Only C.
For Information D. Bid
E.
Construction F.
For Review & Comments G.
For Approval H. See Remarks
Action Status Code: 1.
No Exceptions Taken
2. Make Corrections Noted
3. Other
4.
Amend & Resubmit
5. Rejected -See Rema
REMARKS
17!=
OCT 15 1997
243 N. FROM ST, n INGTON, NC 2 W 1 91 W 3.1048 FAX 91 W 251 8282
cc. M7ccKKIM & CREED ENGINEERS, PA
Signed
C.WVNDOWSFAVORMISITRANS (T.DOC

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US Postdi Service
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9Complete items t and/or 2 for additional services.
I also wish to receive the
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-complete items 3, 4a, and 4b.
following services (for an
• Prim your name and address on the reverse of this form so that we can room this
.
extra fee)'
card to you.
•Attach this form to the from of the mailpiece, or on the back if space does not
1. ❑ Addressee's Address
m
permit.
y
• Write'Retum Receipt Requested' on the mailpiece below the article number.
2. ❑ Restricted Delivery
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t:
delivered.
Consult postmaster for fee.
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3 � ❑ Registered ertifiei
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5. Received By: (Print Name) 8. Addressee's Address (Only if requested
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g 6. Signature: (Addressee orA ent)
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PS Form 3811, December 1994 Domestic Return Receipt

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%YETTEVILLLE WC 293 01 09i23i97
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• Print your name, address, and ZIP Code in this box •
Environment, Health & Natural Resources
127 Cardinal Dr. Ext.
Wilmington, NC 28405

4.w
State of North Carolina
Department of Environment, Health, and Natural Resources
Wilmington Regional Office
James B. Hunt, Jr. Division of Water Quality Wayne McDevitt
Governor Water Quality Section secretary
September 19, 1997
CERTIFIED MAIL Z 312 636 517
RETURN RECEIPT REQUESTED
Mr. Louis Lee
Hoechst Celanese
PO Box 327
Wilmington, NC 28402
Subject: REQUEST FOR STORMWATER
MANAGEMENT PERMIT APPLICATION
Hoechst Celanese
Stormwater Project No. SW8 970921
New Hanover County
Dear Mr. Lee:
On September 18, 1997, the Wilmington Regional Office received a copy of the
Sedimentation Pollution Control Plan Application for Hoechst Celanese. The North Carolina
Administrative Code requires any project that must receive either a Sedimentation and Erosion
Control Plan permit 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 Stormwater 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 October 19,
1997, or the subject project file will be closed and construction may experience a subsequent delay.
Please reference the Project Number above on all correspondence. If you have any questions,
please call me at (910)-395-3900.
Sincerely,
Linda Lewis
Environmental Engineer
RSS/arl: S:\WQS\STORMWAT\STORMSUB\970921.Sep
cc: Tony Roberts, New Hanover County Inspections
IL-inda.Lewis
Central Files
127 Catdiael Drivo E:tenaioa, Wilmingtou, N.C. 29405.3945 • Telep6om 91U-395-3900 • Ea: 910-350-2004
An Equal Oppormady Af&mative Action Employer

WYATi E. BLA.NCHARD, F.E.
County Engineer
MEMORANDUM
s/Ibig-?
Swp�t"16ga1
NEW HANOVER COUNTY
ENGINEERING DEPARTMENT
414 CHESTNUT STREET
WILVIINGTON. NORTH CAROLINA 28401
TELEPHOrVE(919) 341-7139
rn
TO:
LINDA LEWIS
DEM
FROM:
BETH EASLEY
EROSION CONTROL SPECIALIST
RE:
SEDIMENTATION
(:;-p
AND EROSION CONTROL PLAN
qz--9 7%
Nd��,S+
'
Please review the attached
plan.
If you have
any questions,
please contact
this office.
HE/aj
Attachment

ENGINEERING & FACILITIES
3N�Novr. ra
0
ter M091NG��
SW99_?v4a1
APPLICATION FOR PERMIT FOR A
LAND -DISTURBING ACTIVITY
UNDER THE CONDITIONS SET -FORTH BY
THE NEW HANOVER COUNTY
SOIL EROSION AND SEDIMENTATION CONTROL ORDINANCE
Applicant: Hoechst Celanese
Address: 4600 Hwy. 421 North
P.O.Box 327
Wilmington, NC 28402
Telephone Number: _f 9101 341-5500
/.-7Z
Total Acres of Land Disturbance: ,A`s AC
Location and Description of Land Disturbance:
Applicant's Agent: McKim &
34-qr2
qz-�
File Number
I CO co
Fee Paid
Q )c- q_7
Date
Address: 243 North Front Street
Wilmington, NC 28401
Telephone Number: [phone]
Purpose of Development: Wastewater treatment
plant expansion
Plant site is on 421 North of Wilmington. Land disturbancefor grading and
site prep for concrete slabs relating to treatment plant expansion
Land owner(s) of Record
STATEMENT OF FINANCIAL RESPONSIBILITY
Person or firm(s) financially responsible for the
land -disturbing activity. If not a North Carolina
resident you must have a N.C. agent (List Below)
Name: Hoechst Celanese Name: Hoechst Celanese
46.6,0 14/ y stZl o;?7-4
Address: ° Address:
.o, 6 0x
i./G 401
Telephone Number: [phone] Telephone Number: [phone]
Location of deed(s) or instrument(s): County New Hanover Book 528 Page 73
The above information is true and correct to the best of my knowledge and belief and was provided by me while under oath.
(This form must be signed by the financially responsible person if an individual and by an officer, director, partner, attorney -in -
fact, or other person of authority to execute instruments for the financially responsible person if not an individual.) I agree to
provide corrected information should there be any change in the information provided herein.
Date: 12 August 97
Name (Type or
Title: Waste Treatment Project Manager Signature:
E
Lee
I
lil�5 a Notary Public of the County of 6 /opEZ State of North
that, i7 E• GEE appeared personally before me this day and be-
ing d PhYaFkflQYAgdged that the above form was executed by him.
Witness my hard p notarial seal, t yZ day of , 19 97
Seam
z PUBLIC
y.VV .- 7
0'�ygNOVER COV���,,;`
,144JI111110%
My Commission/ expires /o /9- 91