WQ0032018_Regional Office Historical File Pre 2018

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Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen H. Sullins, Director
Division of Water Quality
August 2, 2007
Mr. Robert Rites, City Manager
City of Statesville
PO Box 1111
Statesville, NC 28687
Subject: Permit No. WQ0032018
Pratt Industries
Wastewater Collection System
Iredell County, North Carolina
Dear Mr. Hites,
In accordance with your application received on July 25, 2007, we are forwarding herewith
Permit No. WQ0032018, dated August 2, 2007, to the City of Statesville for the construction and
operation of the subject wastewater collection system extension. This permit shall be effective from the
date of issuance until rescinded and shall be subject to the conditions and limitations as specified
therein. This cover letter shall be considered a part of this permit and is therefore incorporated therein
by reference.
Please pay particular attention to Permit Condition 3 which requires that the wastewater
collection facilities be properly operated and maintained in accordance with 15A NCAC 2T .0403 or any
individual system -wide collection system permit issued to the Permittee.
Permitting of this project does not constitute an acceptance of any part of the project that does
not meet 1) 15A NCAC 2T; 2) the Division of Water Quality's (Division) Gravity Sewer Minimum Design
Criteria adopted February 12, 1996, as applicable; 3) and the Division's Minimum Design Criteria for
the Fast -Track Permitting of Pump Stations and Force Mains adopted June 1, 2000, as applicable,
unless specifically mentioned herein. Division approval is based on acceptance of the certification
provided by a North Carolina -licensed Professional Engineer in the application. It shall be the
Permittee's responsibility to ensure that the as -constructed project meets the appropriate design criteria
and rules. Failure to comply may result in penalties in accordance with North Carolina General Statute
§143-215.6A through §143-215.6C, construction of additional or replacement wastewater collection
facilities, and/or referral of the North Carolina -licensed Professional Engineer to the licensing board.
Mooresville Regional Office 610 East Center Ave., Suite 301 Mooresville, NC 28115 Phone: [phone] Fax: [phone]
Internet: www.ncmwaterquality.org Customer Service: 1-877-623-6748
An Equal Opportunity/Affirmative Action Employer— 50% Recycled/10% Post Consumer Paper
Nor` hCarolina
laturallj/

r. Hiles
Page 2
August 2, 2007
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 for the construction and operation of approximately 814 linear feet of 8-inch gravity sewer,
1,436 linear feet of 4-inch force main, a 145 gallon per minute pump station with duplex pumps, on -site
audible and visual high water alarms, and an on -site generator with automatic transfer switch and the
discharge of 0 gallons per day of collected domestic wastewater into the City of Statesville existing
sewerage system, pursuant to the application received July 25, 2007, and in conformity with 15A NCAC
2T; the Division's Gravity Sewer Minimum Design Criteria adopted February 12, 1996, as applicable;
the Division's Minimum Design Criteria for the Fast -Track Permitting of Pump Stations and Force Mains
adopted June 1, 2000, as applicable; and other supporting data subsequently filed and approved by the
Department of Environment and Natural Resources and considered a part of this permit.
The sewage and wastewater collected by this system shall be treated in the City of Statesville
WWI? (Third Creek NPDES No. NC0020591) prior to being discharged into the receiving stream.
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 30 days following receipt of this
permit. This request must be in the form of a written petition, conforming to Chapter 150B of North
Carolina General Statutes, and filed with the Office of Administrative Hearings, 6714 Mail Service
Center, Raleigh, NC 27699-6714. Unless such demands are made, this permit shall be final and
binding.
If you need additional information concerning this matter, please contact Dee Browder at (704)
663-1699.
for Coleen H. Sullins
cc: MRO WQ - Wastewater Collection Files
Ryan Hager, WK Dickson & Co., Inc.
Surface Water Protection Central Files
PERCS

NORTH CAROLINA
ENVIRONMENTAL MANAGEMENT COMMISSION
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
RALEIGH
WASTEWATER COLLECTION SYSTEM EXTENSION PERMIT
This permit shall be effective from the date of issuance until rescinded and shall be subject to the
following specified conditions and limitations:
1. This permit shall become voidable unless the wastewater collection facilities are constructed in
accordance with the conditions of this permit; 15A NCAC 2T; the Division of Water Quality's
(Division) Gravity Sewer. Minimum Design Criteria adopted February 12, 1996, as applicable; the
Division's Minimum Design Criteria for the Fast -Track Permitting of Pump Stations and Force
Mains adopted June 1, 2000, as applicable; and other supporting materials unless specifically
mentioned herein.
2. This permit shall be effective only with respect to the nature and volume of wastes described in the
application and other supporting data.
3. The wastewater collection facilities shall be properly maintained and operated at all times. The
Permittee shall maintain compliance with an individual system -wide collection system permit for the
operation and maintenance of these facilities as required by 15A NCAC 2T .0403. if an individual
permit is not required, the following performance criteria shall be met as provided in 15A NCAC 2T
.0403:
a. The sewer system shall be effectively maintained and operated at all times to prevent
discharge to land or surface waters, and any contravention of the groundwater standards in
15A NCAC 2L .0200 or the surface water standards in 15A NCAC 2B .0200.
b. A map of the sewer system shall be developed and shall be actively maintained.
c. An operation and maintenance plan shall be developed and implemented.
d. Pump stations that are not connected to a telemetry system shall be inspected every day (Le.
365 days per year). Pump stations that are connected to a telemetry system shall be
inspected at least once per week.
e. High -priority sewer lines shall be inspected at least once per every six-month period of time.
f. A general observation of the entire sewer system shall be conducted at least once per year.
g. Inspection and maintenance records shall be maintained for a period of at least three years.
h. Overflows and bypasses shall be reported to the appropriate Division regional office in
accordance with 15A NCAC 2B .0506(a), and public notice shall be provided as required by
North Carolina General Statute §143-215.1C.

4. This permit shall not be transferable. in the event there is a desire for the wastewater collection
facilities to change ownership, or there is a name change of the Permittee, a formal permit request
shall be submitted to the Division accompanied by documentation from the parties involved, and
other supporting materials as may be appropriate. The approval of this request shall be
considered on its merits and may or may not be approved.
5. Construction of the gravity sewers, pump stations, and force mains shall be scheduled so as not to
interrupt service by the existing utilities nor result in an overflow or bypass discharge of wastewater
to the surface waters of the State.
6. Per 15A NCAC 2T .0116, upon completion of construction and prior to operation of these
permitted facilities, the completed Engineering Certification form attached to this permit shall be
submitted with the required supporting documents to the address provided on the form. A complete
certification is one where the form is fully executed and the supporting documents are provided as
applicable.
7. A copy of the construction record drawings shall be maintained on file by the Permittee for the life
of the wastewater collection facilities.
8. Failure to abide by the conditions and limitations contained in this permit; .15A NCAC 2T; the
Division's Gravity Sewer Design Criteria adopted February 12, 1996 as applicable; the Division's
Minimum Design Criteria for the Fast -Track Permitting of Pump Station and Force Mains adopted
June 1, 2000 as applicable; and other supporting materials may subject the Permittee to an
enforcement action by the Division, in accordance with North Carolina General Statutes §143-
215.6A through §143-215.6C.
9. In the event that the wastewater collection 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
facilities.
10. The issuance of this permit shall not exempt the Permittee from complying with any and all
statutes, rules, regulations, or ordinances that may be imposed by other government agencies
(local, state and federal) which have jurisdiction, including but not limited to applicable river buffer
rules in 15A NCAC 2B .0200, erosion and sedimentation control requirements in 15A NCAC Ch. 4
and under the Division's General Permit NCG010000, and any requirements pertaining to wetlands
under 15A NCAC 2B .0200 and 15A NCAC 2H .0500.
11. Noncompliance Notification:
The Permittee shall verbally report to a Division of Water Quality employee at the Mooresville
Regional Office, telephone number [phone], as soon as possible, but in no case more than
24 hours or on the next working day, following the occurrence or first knowledge of the occurrence
of either of the following:
a. Any process unit failure, due to known or unknown reasons, that renders the facility incapable
of adequate wastewater transport, such as mechanical or electrical failures of pumps, line
blockage or breakage, etc.; or
b. Any failure of a pumping station or sewer line resulting in a by-pass directly to receiving waters
without treatment of all or any portion of the influent to such station or facility.
2

IV111°.117
Voice mail messages or faxed information is permissible, but shall not be considered as the
initial verbal report. Overflows and spills occurring -outside normal business hours may also be
reported to the Division of Emergency Management at telephone number [phone] or
[phone]. Persons reporting any of the above occurrences shall file a spill report by
completing Part I of Form CS-SSO (or the most current Division approved form), within five days
following first knowledge of the occurrence. This report shall outline the actions taken or
proposed to ensure that the problem does not recur. Part II of Form CS-SSO (or the most
current Division approved form) can also be completed to show that the SSO was beyond
control.
Permit issued this the 2nd day of August, 2007
NORTH CAROLINA ENVIRONMENTAL MANAGEMENT COMMISSION
for Coleen H. Sullins, Director
Division of Water Quality
By Authority of the Environmental Management Commission
Permit Number WQ0032018
3

pp
•
East Track Engineering Certification
Permit No. WQ0032018
August 2, 2007
OwneriWQCSIWVVfP
Robert Hites, City Manager
City of Statesville
PO Box 1111
Statesville, NC 28687
PE
Ryan Hager
WK Dickson & Co., Inc.
401 4'h St. SW
Suite 201
Hickory, NC 28602
Complete and submit this form to the permit issuing regional office with the following:
• One copy of the project record drawings (plan & profile views of sewer lines) of the wastewater collection
system extension
• Supporting design calculations (selected pumps, system curve, operating point, available storage if portable
generator(s) or storage greater than longest past three year outage reliability option selected) for any pump
stations permitted as part of this project
• Changes to the project should be clearly identified on the record drawings or in written summary form. Permit
modifications are required for any changes resulting in non-compliance with this permit, regulations or
minimum design criteria.
This project shall not be considered complete nor allowed to operate until this Engineer's Certification and all
required supporting documentation have been received by the Division. Therefore, it is highly recommended
that this certification be sent in a manner that provides proof of receipt by the Division.
ENGINEER'S CERTIFICATION
❑ Partial ❑ Final
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 Pratt Industries, an lredell County
project for the Permittee, hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the construction such that the construction was observed to be built within substantial compliance of
this permit; 15A NCAC 2T; the Division of Water Quality's (Division) Gravity Sewer Minimum Design Criteria adopted
February 12, 1996 as applicable; the Division's Minimum Design Criteria for the Fast -Track Permitting of Pump
Stations and Force Mains adopted June 1, 2000 as applicable; and other supporting materials.
North Carolina Professional Engineer's
seal, signature, and date:
SEND THIS FORM & SUPPORTING DOCUMENTATION
WITH REQUIRED ATTACHMENTS TO THE FOLLOWING ADDRESS
MOORESVILLE REGIONAL OFFICE
SURFACE WATER PROTECTION
610 EAST CENTER AVENUE, SUITE 301
MOORESVILLE NC 28115
The Permittee is responsible for tracking all partial certifications up until a final certification is received. Any
wastewater flow made tributary to the wastewater collection system extension prior to completion of this
Engineer's Certification shall be considered a violation of the permit and shall subject the Permittee to appropriate
enforcement actions.

,-TRACK APPLICATJON for GRAVITY SE`V4^'fRS, PUiVIP STATIONS, AND FORCE MAINS
Ipi
PAGE 3
USE THE TAB KEY TO MOVE FROM FIELD TO FIELD! Application Num
(to be completed by DWQ)
Owner:
1a. City of Statesville _ .
Full Legal Name (company, municipality, HOA, utility, etc.
2
0 1b. Rob Hites, City Manager
Signing Official Name and Title (Please review 15A NCAC 2H .0206(b) for authorized signing officials!)
1c.
Id.
1 f.
1 h.
The legal entit who will own this system is:
Individual Federal
P.O. Box 1111
Mailing Address
North Carolina
State
[phone]
Telephone
Project (Facility,
Sartitary.
Brief Project Name (permit will
Contact Person:
Municipality ❑ State/County 0 Private Partnership ❑ Corporation 0 0
nformation,
le. Statesville
City
1 g. 28687
Zip Code
.(7O441 878-3 14 1 j. Rob [e-mail]
Facsimile E-mail
P
er to this name
2b. Iredell
County
ville.nc.us
her (specify):
here Project is Located
3a. Larry Pressley - Director of Public Works
Name and Affiliation of Someone Who Can Answer questions About this Application
3b. [phone]
3c. LPressley@ci statesville.nc.us
Phone Number E-mail
Project is New ❑ Modification (of an existing permit) If Modification, Permit No.:
For modifications, attach a separate sheet clearly explaining the reason for the modification (Le. adding another
phase, changing line size/length, etc.). Only include the modified information in this permit application - do not
duplicate project information in B(7) and B(10-11) that has already been included in the original permit.
2. Owner is Public (skip to Item B(3)) 0 Private (go to Item 2(a))
2a. If private, applicant will be: 2b. If sold, facilities owned by a (must choose
0 Retaining Ownership (i.e. store, church, single office, etc.) or
2 ❑ Leasing units (lots, townhomes, etc. - skip to Item B(3))
0 ❑ Selling units (lots, townhomes, etc. - go to Item B(2b))
Cit of Statesville
Owner of Wastewater Treatment Facility (VWVTF) Treatin
Third Creek Wastewater Treatement Plant
Name of WW l
City of Statesville 5b. 8"
Owner of Downstream Sewer Receiving Sewer Size
The origin of this wastewater is (check all that apply):
0 Residential Subdivision
El Apartments/Condominiums
Mobile Home Park
El School
Restaurant
❑ Office
Public Utility (Instruction ill)
Homeowner Assoc./Developer (Instruction IV)
astewater From This Project
4b. NC0020591
WWTF Permit No.
0 Gravity
Force Main
ED Car Wash
0 Institution
❑ Hospital
0 Church
Ej Nursing Home
Z Other (specify); Indust
Permit Number of Downstream Sewer (if known
25 % Domestic/Commercial
75 % Industrial
Other (specify):
Volume of wastewater to be allocated for this particular project: I8, OO gallons per day
*Do not include previously permitted allocations
If the permitted flow is zero, indicate why:
❑ Interceptor Line Flow will be permitted in subsequent permits that connect to this line
Flow has already been allocated in Permit No.
❑ Rehabilitation or replacement of existing sewer with no new flow expected
FTA 117, _ RPv l Fla/F15

ppirCK APPLICATION for GRAVITY SEWERS, PUMP STATIONS, AND FORCE MAINS PAGE 4
0
W
M
Z
F
Z
V11.
0
—
Qplans
E
Ct
0
ZSE
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re
W
11
m
114.
I
9. Provide the wastewater flow
.0219(I) for Item B(7) or the
that in 15A NCAC 2H .0219(I)(1-2)
NCAC 2H .02190)(3).
Domestic Flow = 180 employees
User Wastewater Survey
70. Sum mary of Sewer Lines
Size (inches)
4"
calculations used
design flow for line
must be
x 25 gal/day/employee
& Permit Application.
__...._.._...__._._._
to be Permitted (attach
in determining the permitted flow in
or pump station sizing if zero flow in
supported with actual water or wastewater
= 4500 gal/day. Remaining
............ .....__.
additional sheets if necessary)
Length (feet)
1436
814
accordance with 15A NCAC 2H
the space below. Values other than
use data in accordance with 15A
flow was obtained from the Industrial
Gravity or Force Main
(use the pull down menu)
Force Main
Gravity
8"
ENTER TOTAL LINE LENGTH
Summary of Pump Stations
•
IN MILES
to be Permitted
Design Flow Operational
(MGD)
0.43
(attach additional sheets
Point
.GPM @ TDH
as necessary)
Power
(1- dual line feed;
portable generator
Reliability Option
2- permanent generator w/ATS; 3-
wltelemetry; 4-wet well storage)
Location ID
(self chosen - as shown on ;
for cross-reference)
Corner of Pratt Property
f 0.13 145 GPM @ 133 TDH
2
12. Does the sewer system comply
Mains (latest version), the
with the Minimum Design Criteria
Gravity Sewer Minimum Design Criteria
reference the pertinent minimum
is requested. SUBMIT TWO COPIES
TO THE VARIANCE WITH YOUR APPLICATION
for the Fast Track Permitting of Pump Stations and Force
(latest version) and 15A NCAC 2H .0200 as applicable?
design criteria or regulation and indicate why a
OF PLANS, SPECIFICATIONS OR CALCULATIONS
L Yes ■ No If no, please
variance
PERTINENT
13. Have the following permits/certifications been submitted for approval?
Wetland/Stream Crossings - General Permit or 401 Certification?
Sedimentation and Erosion Control Plan?
Stormwater?
® N/A
• Yes ■ No
@ Yes ■ No • N/A
® N/A
• Yes • No
Does this project involve aerial lines or siphons? Check if yes:
tThese lines will be. considered hiah ariority and must be checked once.everv.six months
15. Does this project have gravity sewer lines designed at minimum
Be aware that the Division will not accept installed lines more than 10% flatter than
corrected prior to submitting the final engineering certification..
•
_
installed outside this tolerance should be
_ __
slopes? •
the minimum slope. Lines
FTA 110/f11 - Rev 1 f)d/ns

',TRACK APP.L1CA 1I©N for GRAVITY SEWERS, PUMP STATIONS, AND FORCE MAINS
PAGE 5
z
9
Use the Division's guidance document entitled, "DETERMINING STREAM CLASSIFICATIONS FOR FORM FTA 02/03
(FAST -TRACK SEWER SYSTEMS)" to collect and record the stream classification data below (attach additional sheets as
necessary). This document is available from our web site or by contacting the appropriate Division of Water Quality
regional office (see instructions for addresses) OR indicate the following:
J A Stream Classification is not needed because all parts of the project are at least 100 feet away from any down slope
waterbody; AND,
© A Stream Classification is not needed because the design does not depend on wet well storage as a power reliability
option for any pump station near a Class C down slope waterbody,.
Location ID on Map
(self chosen - as shown on
map for cross-reference)
See Attached Mao
l a.
Name of
Waterbody
Morrison Creek
County
Iredell
Waterbody Stream Waterbody
River Basin Index. Classification
Yadkin 12-108-20-3 C
Submit the 8.6'" x 11" COLOR topographic map as required in Instruction VI
dless of whether a classification is provided!
Applicant" Certification:
1, Robert W. Hites, attest that this application for Sanitary Sewer Improvements to Serve Pratt Industnes
has been reviewed by me and is accurate and complete to the best of my knowledge. l understand that if all required
parts of this application are not completed and that if all required supporting documentation and attachments are not
included, this application package is subject to being returned as incomplete. Note: in accordance with North Carolina
General Statutes 143-215,6A and 143-215,68, any person who knowingly makes any false statement, representation, or
certification in any application shall be guilty of a Class 2 misdemeanor which may include a fine not to exceed $10,000
11 as civil penalties up to $25,000 per violation.
Signing Official Signature
2. Professional Engineer's Certification:
Date
1 attest that this application for Sanitary Sewer Improvements to Serve Pratt Industries has been reviewed by me and is
accurate, complete and consistent with the information in the engineering plans, calculations, and all other supporting
documentation to the best of my knowledge. I further attest that to the best of my knowledge the proposed design has
been prepared in accordance with the applicable regulations, Gravity Sewer Minimum Design Criteria for Gravity Sewers
adopted February 12, 1996, and the Minimum Design Criteria for the Fast -Track Permitting of Pump Stations and Force
Mains adopted June 1, 2000 and the watershed classification in accordance with Division guidance. Although certain
portions of this submittal package may have been developed by other professionals, inclusion of these materials under my
signature and seal signifies that I have reviewed this material and have judged it to be consistent with the proposed design.
Note: In accordance with NC General Statutes 143-215,6A and 143-215,6B, any person who knowingly makes any false
statement, representation, or certification in any application shall be guilty of a Class 2 misdemeanor which may include a
fine not to exceed $10,000 as well as civil penalties up to $25,000 per violation.
2a. Ryan W. Hager, PE.
Professional Engineer Name
2b. WK Dickson & Co., Ines
Engineering Firm
2c. 401 4th St. SW Suite 201
Mailing Address
2d, Hickory
City
2g, [phone] 2h. [phone]
Telephone Facsimile
2e. NC 2f, 28602
State Zip
2i, rwhager €@wkdickson.com
E-mail
Seal, Signature Crate
PTA n')/fit ikt/fic

4'D ,N; SCE.-
AOC
Fr{".C�J4,7
.n).2o5 sue} Y [t
toNktf
Awq
DICKSON
commiiitty Infrastructure consultants
401 4th S kitt ,'I SW, SUITE 201
FNCKCRY, NC 28602
[phone]
Office Location .
North Ccrolkwa Georgia
South Carolina Florida
SAN. SEWER IMPROVEMENTS
TO SERVE PRATT INDUSTRIES
USGS xxxxx QUADRANGLE

Central Files: APS SWP
08/02/07
Permit Number WQ0032018
Permit Tracking Slip
Program Category Status Project Type
Non -discharge Active New Project
Permit Type Fast Track Version Permit Classification
Gravity Sewer Extension, Pump Stations, & Pressure Sewer 1.00 Individual
Extensions
Primary Reviewer Permit Contact Affiliation
dee.browder
Permitted Flow
18500
Facility
Facility Name
Pratt Industries
Location Address
Owner
Major/Minor Region
Minor Mooresville
County
Iredell
Facility Contact Affiliation
Robert Hites, Jr
PO Box 1111
Statesville NC 286871111
Owner Name Owner Type
City of Statesville Government - Municipal
Owner Affiliation
Robert Hites, Jr
PO Box 1111
Statesville
Dates/Events
NC 286871111
Orlg Issue App Received Draft Initiated
08/02/07 . 07/25/07
Scheduled
Issuance
Public Notice Issue Effective Expiration
08/02/07 08/02/07
Regulated Activities Re. uested/Received Events
Commercial or industrial, other Additional information requested
Wastewater collection
Outfall NULL
Additional information received
Waterbody Name
Stream index Number Current Class Subbasin

community infrastru .turn c sn,s 9t nfs
July 24, 2007
NCDENR / WQ Division
Mooresville Regional Office
Non -Discharge Permitting Unit
610 East Center Avenue Suite 301
Mooresville, North Carolina 28115
Re: Sanitary Sewer improvements
To Serve Pratt Industries
Fast Track Sewer Application
Iredell County, North Carolina
WKD # 70205.00.Hl -I
Gentlemen:
We are submitting, on the behalf of the City of Statesville, the East -Track Application for the referenced
project. Enclosed are two copies of the executed application ftrrn, color vicinity map and application
fee. Please contact our office if there are any questions.
Sincerely,
W. K. Dickson & Co., Inc.
Sam King, Jr., PE, PLS
Enclosure
cc: Mr. Larry Pressley — City of Statesville

January 1O,2O08
Ms. Dee Browder
N[DENR/WQDivision
Mooresville Regional Office
Non -Discharge Permitting Unit
6lAEast Center Avenue 5Vita3Ol
Mooresville, North Carolina 28115
Re: Sanitary Sewer Improvements
To Serve Pratt Industries
P "r�, I,
Pump Station Temporary Operation Plan
WKD No.: 70205J00'H|-1
Ms. Browder:
��������
|n\° ������ /wo���
DVV��
�����|��Ce
Asrequested, this letter will Outline the temporary operation plan for the Pump station associated with
this project. Due to long lead times for associated equipment and service commitments made to the
served industry, we have formed a plan to operate the pump station temporarily until the backup
electric generator isinstalled and placed into service.
The industry requires sewer service starting February l, 2008. However, due to delivery times, the
generator will not be installed until mid to late February. All other appurtenances necessary k)operate
the pump station in accordance with state regulations can be in service by February l. The City mf
Statesville owns portable suction lift pump equipped with its own power Source used as a by-pass
pvrnp in case n/pump failure or other complications. The pump station will be equipped with u by-
pass purnping assembly compatible with the [ity'sportab\e pump. The by-pass Pumping assembly
consis|sofasuction pipe inthe wet well and nvalve and assembly that allows aquick connection
The oor&db|o Pump along, with the by-pass pumping assembly will be available in case of an
emergency for the short period of time the purmp station will be in service without backup power. All
alarms and telemetry vvi|| be in service to notify the City in case of on ermergency. Further, the City has
agreed k)frequently visit the site when the pump station isinservice without backup power. it should
also be noted that the served industry will have a nninionm| wastewater discharge in the event nfa
power failure.

Dee Browder
January t , 2008
Page
ust the information provided sufficiently describes the temporary operation plan. Please resp nr
ting if this acceptable. We greatly appreciate your assistance to this matter. If you have any
ions or need additional information, please do not hesitate to call.
Sincerely;'
. K. Dickson ' Co. Inc:
Ryan w". Haaer, PE
Enclosure
cc: fir.
Rob Krebs - NCDENR
Joe Hudson — City of Statesville
ynn hiblock lredell County
MAN' West Proper#ie'sV0205t;, Approvals',NC1 NR SLAV

Re: FW: Sanitary Sewer to Serve Pratt Industries - Iredell County
Subject: Re: FW: Sanitary Sewer to Serve Pratt Industries - Iredell County
From: Dee Browder <[e-mail]>
Date: Fri, 08 Feb 2008 10:54:16 -0500
To: Ryan Hager <[e-mail]>
CC: Rob Krebs <[e-mail]>, Brian Tripp <[e-mail]>, Lynn Niblock <[e-mail]>
WQ0032018
;Pratt Industries
!The MRO finds your temporary proposal for back up pumping acceptable. Please notify this office when the generator
is delivered. Also, notify MRO if issues with your plan of operation in the interim arise.
Dee Browder
'Environmental Engineer I
•
1 of 1 2/8/2008 I0:54 AM

Michael F. Easley, Governor
William G. Ross Jr., Secretary
North Carolina Department of Environment and Natural Resources
Coleen Sullins, Director
Division of Water Quality
July 7, 2008
City of Statesville
P.O.Box}1}1
Statesville, North Carolina 28687
Attn: Robert Hites, City Mgr.
SUBJECT: Pratt Industries
Permit No. WQ0032018
Wastewater Collection System Extension
Final Engineering Certification
Dear Permittee:
The Division received a final engineering certification for the subject project on June 25, 2008. A full
review of the certification materials may or may not be conducted. It is assumed that receipt of
this certification indicates compliance with all regulations, design criteria and the permit. Please be
reminded that the Permittee is responsible for keeping a copy of the final record drawings for the
life of the project. If you have not received a copy, please contact your consultant immediately to
obtain a copy.
You are receiving this letter because the Division has you listed as the responsible party. If this
permitted system is no longer owned by you, please complete Form PNOCF-S as this permit is not
automatically transferable. Form PNOCF-S can be downloaded from
htto://h2o.enr.sfate.nc.us/ndpu/ndpuapps.html#Sewer.
If you have any questions concerning this document or the completion of Form PNOCF-S (if
necessary), please contact Ms. Dee Browder at the letterhead address or via E-mail at
[e-mail].
f1,Robert Krebs
(/ Surface Water Protection Regional Supervisor
Enclosure
Cc: Ryan Hager, WK Dickson & Co.
Surface Water Protection Section Central Files (certification page only)
NorthCarolina
Naturally
Pretreatment, Emergency Response and Collection Systems Unit Internet http:/Th2o.enr.nc.state.uslndpu
1617 Mail Service Center, Raleigh, NC 27699-1617 An Equal Opportunity Action Employer
Telephone [phone] Fax [phone]% recycled/10% post -consumer paper

Track En
nee • Cer ifica
Permit No. WQ0032018
August 2, 2007
OwnerIWQCSNWJTP
Robert Hites, City Manager
City of Statesville
PO Box 1111
Statesville, NC 28687
on
PE
Ryan Hager
WK Dickson & Co., Inc.
401 4`h St. SW
Suite 201
Hickory, NC 28602
NC DENR MR0
DW -Surf ace Water Protection
Complete and submit this form to the permit issuing regional office with the following:
`,7 One copy of the project record drawings (plan & profile views of sewer lines) of the wastewater collection
system extension
• Supporting design calculations (selected pumps, system curve, operating point, available storage if portable
generator(s) or storage greater than longest past three year outage reliability option selected) for any pump
stations permitted as part of this project
Changes to the project should be clearly identified on the record drawings or in written su
modifications are required for any changes resulting in non-compliance with this perrnit. r
minimum design criteria,
nary form, Permit
ulations or
This project shall not be considered complete nor allowed to operate until this Engineer's Certification and all
required supporting documentation have been received by the Division. Therefore, it is highly recommended
that this certification be sent in a manner that provides proof of receipt by the Division.
ENGINEER'S CERTIFICATION
] Partial Final
, as a duly registered Professional Engineer in the State of North Carolina, having been
authorized to observe ( periodically, 0 weekly, ID full time) the construction of Pratt Industries, an Iredell County
project for the Permittee, hereby state that, to the best of my abilities, due care and diligence was used in the
observation of the construction such that the construction was observed to be built within substantial compliance of
this permit; 15A NCAC 2T; the Division of Water Quality's (Division) Gravity Sewer Minimum Design Criteria adopted
February 12, 1996 as applicable; the Division's Minimum Design Criteria for the Fast -Track Permitting of Pump
Stations and Force Mains adopted June 1, 2000 as applicable; and other supporting materials,
North Carolina Professional Engineer's
seal, signature, and date:
SEND THIS FORM & SUPPORTING DOCUMENTATION
WITH REQUIRED ATTACHMENTS TO THE FOLLOWING ADDRESS
MOORESVILLE REGIONAL OFFICE
SURFACE WATER PROTECTION
610 EAST CENTER AVENUE, SUITE 301
MOORESVILLE NC 28115
The Permittee is responsible for tracking all partial certifications up until a final certification is received, Any
wastewater flow made tributary to the wastewater collection system extension prior to completion of this
Engineer's Certification shall be considered a violation of the permit and shall subject the Permittee to appropriate
enforcement actions.

community infrastructure consultants
June '24, 2008
NC DENR MRO
North Carolina Department of Environment & Natural Resource Water Protection'
Mooresville Regional Office
Surface Water Protection
610 East Center Avenue, Suite 301
Mooresville, N.C. 28115
RE: Sanitary Sewer Improvements to Serve Pratt Industries
Engineer's Certification and Record Drawings
City of Statesville
Permit No.: WQ0032018
WKD No.: 70205.00.HI-A
To Whom It May Concern:
On behalf of the Town of Mooresville we are submitting one copy of the aforementioned project
record drawings, supporting calculations, and the Fast Track Engineering Certification Form.
If you have any questions or require additional information, please do not hesitate to call.
Sincerely,
W.K. DICKSON & CO., INC.
/ „,„/
/
Ryan W. Hager, PE
Eiclosures:
cc: joe Hudson — City of Statesville
Larry Pressley — City of Statesville
Lynn Niblock — Iredell County
NiVrojeggJWVesi Properkes17020500HIVD.ocurnenIAA eneral Couesp1Const AdmIrSewf.,Cr AdroirgiemEer (•,,,werCego Rt,cora.1 Dwg 061408_doc

NC DENR • RQ
DWQ- ,.urfkce Wafer Prot $ 1
Pump Station design Calculations
Sanitary Sewer Improvements
To Serve
Pratt Industries
WKD Project No. 70245.04.H1
July 19, 2007
W. K. Dickson
401 4th Street SW, Suite 201
Hickory, NC 28602

PUMP STATION DESIGN CALCULATIONS - Existing PS "C"
Project: Sanitary Sewer Improvements
to Serve Pratt Industries
For West Properties of Statesville
Statesville, North Carolina.
WKD # 70205.00.WL
Date: July 11, 2007
DESIGN CALCULATIONS
1. Narrative
'This portion of the project will provide an evaluation of the existing pump station and force main of which the'
proposed force main will connect to. The objective of the calculations provided herein is to determine the
pumping rate of the existing pump station when the proposed pumping station is pumping at its design capacity.
The proposed pumping station describe in the calculations provided herein is reffered to as Pumping Station "A".
The existing pumping station describe in the calculations provided herein is reffered to as Pumping Station C.
11. Pump Station Design
A. Wastewater Flows
Existing Flows are estimated
B. Peak Flow
Thus: 75,000 gpd x (1 day / 24 hrs) x 2.5 x (1 hr / 60 min)
C. Target Pumping Rate --
gpm is design pump capacity]
130 gpm
130.21 gpm

0
"B"
Discharge El — 979.00 ft
. Q Pump Off —
9 .
D. Piping .
Pump Discharge .
Force Main (C-D)
Force Main Length (C-B)
Force Main Length (13-D)
Force Main Length (C-D)
Force Main Length to High Point
Force Main Length to Calculate TDH
Pump Capacity
Velocity at Pumping Rate
Friction Coefficient
Headloss in FM per 1,000 ft.
"Flow Away" Calculation
Force Main Storage
Average Force Main Detention
E. Dimensions and Initial Elevations
F.
Wet Well Diameter: Diameter (inside)
Surface Area
Pump Station Rim Elevation
Invert of Influent Line
High Level Alarm
Lag Pump On
Lead Pump On
Pump Off
Bottom Wet Well
Force Main Discharge Elevation
Area x (Pump On - Pump Off) x (7.48 gal ./cf) —
Detention Volume / Inflow Rate —
Detention Volume / (Pump Capacity - Q) —
Pump On Time x # of Cycles x 24 hours/day -
Pump On Time+ Fill Time —
60 min/hr / Pumping Cycle —
980.60 ft
300 GPM
• •
DIP
1" PVC
7,370
i.4;!6?0'ift
4,670 ft.
300 gpm
C NESEE:i
2.30 ft.
835 gpm
19,246 gallons
0.26 days
0
"A"
.Pump Off •
Q
924.00 ft
145 GPM
(Distance to Backpressure Sustaining Valve)
If greater than pumping rate, TDH calculated
using force main length to high point and
high point elevation. Install combination
air /vacuum valve at highest point.
Detention Volume
Fill Time —
Pump On Time —
Run Time per Day —
Pumping Cycle —
Cycles
System Works
1. Static Head
Main::4416 ft.
38,48 sq. ft.
ft. MSL
40 ft. MSL
ft. MSL
ft. MSL
ft. MSL
...60 ft. MSL
7,93 ft. MSL
ft. MSL
Force Main High Poi ft. (BPV)
Pump Off Elevation: 980.60 ft.
Total Static Lift 3 7A0 ft.
288 gal.
5.53 min.
1.16 min.
250.00 min.
6.69 min.
8.97 cycles/hr
Force Main Discharge
Pump Off Elevation:
Total Static Lift
979.00 ft.
980.60 ft.
-1.60 ft.

2. Friction Ldsses:
a. Station Loss "C"
4 Ductile Iron Pipe - - ft.
4 Gate Valve ..... 1 ea. @ ' -iW ftJea. = 3 ft.
4 Swing Check Valve ea. @ :;;;25 04fllea. _ • 25•ft.
4 90 Degree Bend 3 ea. @ 11 00 ftJea. _ . 33 ft.
4 Tee (Branch flow) 1 ea. @ 26 10 ftJea. = 20 ft.
Total Equivalent Length •
b. Force Main (C-B) .
8 Force Main (C-B) 970 ft.
B Tee (Line flow) `s.; 1 ea. 14'00 ftJea. A • 14 ft.
8 90 degree bend 1% • ea. @ 20'00: ftJea. = 20 ft.
Total Equivalent Length ' • 1,004 ft.
Force Main (B-D) (Distance to Backpressure Sustaining Valve)
116 ft.
8 Force Main (B-D)
8 Tee (Branch flow)
8 90 degree bend
3. System curve
ea. @
6,f0 ftJea.
Total Equivalent Length
3,700 ft.
88 ft.
40 ft.
3,828 ft.
145
180
37.4
37.4
3.03
0.90
3.43
10.23
0.02
0.07
44.8
51.6
145
200
37.4
37.4
3.68
1.09
4.17
11.42
0.03
0.08
46.4
53.7
145
220
37.4
37.4
4.40
1.30
4.97
12.68
0.03
0.08
48.1
55.9
145
240
37.4
37.4
5.16
1.53
5.84
13.99
0.04
0.09
50.0
58.2
145
260
37.4
37.4
5.99
1.78
6.77
15.36
0.04
0.10
52.0
60.6
145
280
37.4
37.4
6.87
2.04
7.76
16.80
0.05
0.11
54.1
63.2
145
300
37.4
37.4
7.80
2.31
8.82
18.29
0.06
0.13
56.4
65.9
145
145
320
340
37.4
37.4
37.4
37.4
8.79
9.83
2.61
2.92
9.94
11.12
19.84
21.45
0.06
0.07
0.14
0.15
58.8
61.3
68.8
71.7
145
360
37.4
37.4
10.93
3.24
12.36
23.11
0.08
0.16
64.0
74.8
145
380
37.4
37.4
12.08
3.58
13.66
24.83
0.09
0.17
66.8
78.1
145
400
37.4
37.4
13.28
3.94
15.02
26.61
0.10
0.19
69.7
81.4
145
420
37.4
37.4
14.54
4.31
16.43
28.45
0.11
0.20
72.8
84.9
145
440
37.4
37.4
15.84
4.70
17.91
30.34
0.12
0.22
76.0
88.5
145
460
37.4
37.4
17.20
5.10
19.45
32.28
0.13
0.23
79.3
92.2
145
480
37.4
37.4
18.61
5.52
21.04 _
34.29
0.15
0.25
82.7 i 96.1
gpm

65.0
64.0
63.0
62.D
61.0 -
60.0
59.0'
58.0 —
Yo 57.0 --
1-
56.0 —
55.0 —
54.0 —
53.0
52.0
51.0 —
System CurveplmLeiO°°°°' Pump Curve Assumed SystemCurveOperating Togeth4--
L
1
50.0
210 215 220
225 230
G. Existing Pump Operation
Pump Capacity (Together):
Pump Capacity (Alone):
Motor Horsepower:
Electrical Service:
Impeller Diatneter:
L
•
•
:/
I ;#..4 i 1 I I I 1 I I i I i I I i
235 240 245 250 255 260 265 270 275 280 285 290 295 300 305 310 315 320 325
FLOW (GPM)
256 gpm @
310 HgpmP @
D @
;s:. 460. volt
.........................
6D.1 TDH
57.6 TDH
RPM
3 Phase
Fairbanks Morse Pump - 4" 5432 MV
(See sample pump curve in manufacturer's information attached)
330

® Fairbanks Morse Pump
A Member of Pentair Pump Group
CURVE NO.:
REV.
C-.086135
4" 5432 _ BMITTAL CURVE
PROJECT NO.:
Head - Feet
90
80
70
60
50
40
30
20
10
086135
SPEED IIMPELLERIeAMETERI ANES
.SPHERE I DRIVER( DATF" BY
1755 T4B1A a8'35'
TWO
3,00"• I 10, . —3119/03 VLB
THIS CURVE IS BASED ON THE. ACTUAL TEST PERFORMANCE
OF -A SIMILAR PUMP. ONLY THE THE INDICATED POINT(S) IS
GUARANTEED '
GUARANTEED VALUES
FLOW I HEAD I Ei=F. BHP
300 I 57
!iy
Head
0
0
80
70
chi 60
50
W 40
30
ce 20
Power - BHP
14
12
10
8
6
4
0
100
100
200
200
300
300
400
400 -
Power.
0
500
500
600
600
100 200 300 400 500 600
Flow Rate - GPM
700
700
700
800
800
800
900
900
900
1000
1000
3000

- PUMP STATION DESIGN CALCULATIONS - PS r"A" - Existing FM Discharge
Project Sanitary Sewer Improvements
to Serve Pratt industries
For West Properties of Statesville
Statesville, North Carolina
WKD # 70205.00.H1
• Date: July 11, 2007
, • DESIGN CALCULATIONS
1. Narrative
This portion'of the project will provide for installation of•a pumping station and force main tying into an existing 8"
force main serving Pratt Industries and future Industrial development located in Statesville, North Carolina. The
proposed pumping station describe in the calculations provided herein is reffered to as Pumping Station "A". The
existing pumping station describe in the calculations provided herein is reffered to as Pumping Station "C".
11. Pump Station Design
A. Wastewater Flows
1 Pratt Industries
2 Second industry
3 Third Industry
B. Peak Flow
Thus: 43,500 gpd x (1 day / 24 hrs) x 2.5 x (1 hr / 60 min) �.
C. Target Pumping Rate =
Use
• ' gpm for design pump capacity
13,500 gpd
15,000 gpd
15,000 gpd
43,500 gpd
76 gpm
76 gpm

0
Discharge El — 935.00 f!
Existing PS "C"' •
0 ' Pump Off — 980.60 ft
Q— . 3000PM •
D. Piping
Pump Discharge
Force Main (A-B)
Force Main (B-D)
Force Main Length (A-B)
Force Main Length (B-D)
Force Main Length to High Point
Force Main Length to Calculate TDH
Pump Capacity
Velocity at Pumping Rate
Friction Coefficient
Headloss in FM (A-B) per 1,000 ft.
"Flow Away" Calculation
Force Main Storage
Average Force Main Detention
E. Dimensions and Initial Elevations
E'' " DIP
"PVC
DE " PVC
if ft.
6,400 ft.
5,136 ft.
5,136 ft.
145 gpm
3.71fp$,...._...,
C
15.14 ft.
1,218 gpm i
17,650 gallons
0.41 days
0
Proposed PS "A"
Purnp Off a 924.00 ft
Q — 145 GPM
(Distance to Backpressure Sustaining Valve)
(Line A B + Line B-D)
If greater than pumping rate, TDH calculated
using force main length to high point and
high point elevation. Install combination
air/vacuum valve at highest point.
...................
Wet Well Diameter: Diameter (inside) .... !?t3QE ft.
Surface Area 28.27 sq. ft.
Pump Station Rim Elevation >:94400 ft. MSL
Invert of Influent Line#>927OQ ft. MSL
High Level Alarm ;'<92b1?.ft. MSL
Lag Pump On 926.00 ft. MSL
Lead Pump On 925.00 ft. MSL
Pump Off 924.00 ft. MSL
Bottom Wet Well 922.50 ft. MSL
Force Main Discharge Elevation i.;:90 ft. MSL
Detention Volume — Area x (Pump On - Pump Off) x (7.48 galic0
Max Detention Volume — Area x (High Level - Pump Off) x (7.48 gal Jct) ..
Fill Time — Detention Volume/ inflow Rate
Max Fill Time —
Pump On Time —
Run Time per Day -
Pumping Cycle
Cycles
F. System Works
1. Static Head:
Max Detention Volume/ Inflow Rate —
Detention Volume J (Pump Capacity - Q) —
Pump On Time x # of Cycles x 24 hoursfday
Pump 0n Time+ Fill Time —
60 min/hr / Pumping Cycle —
• Force Main High Poinf :1Ol: qp; ft.
Pump Off Elevation: 924A0 ft.
Total Static Lift 94.00 ft.
211 gal.
4,336 gal.
7.00 min.
2.39 hr.
1.84 min.
300.00 min.
8.84 min.
6.78 cycles/hr
Force Main Discharge
Pump Off Elevation:
Total Static Lift
935.00 ft.
924.00 ft.
11.00 ft.

2. Friction Loses:
a. Station Loss
b.
4 Ductile Iron Pipe
4 Plug Valve
4 Swing Check Valve
4 90 Degree Bend
4 Tee (Branch flow)
Force Main (A-B)
'4 Force Main '
4 Gate Valve •
4 Plug Valve '
4 45 degree bend
4 90 degree bend
Force Main (B-D) (Distance to Backpressure
8 Force Main (as previously identified)
8 Tee (Branch flow)
8 90 degree bend
3. System curve
256
94.0
94.0
ea. @=s;25g0ftJea.
ea. @ 25 0(j.':. ftJea.
ea. @ Z')`a0€ftJea.
ea. < 20 00 ftJea.
Total Equivalent Length
ea.
ea. @
ea. @
ea. @ :1^1 00 ft./ea.
Total Equivalent Length
Sustaining Valve)
Oft/ea.
ftJea.
ea. @ 44;00 ftJea.
ea.@ r':` '2000.ftJea.
Total Equivalent Length
SCaEcrrs�'NL
0.44
5.93
0.60
lJ` ft.
25 ft.
25 ft.
33 ft.
20 ft.
113 ft.
1,436 ft.
• 5 ft. •
25 ft.
20 ft.
22 ft.
1,508 ft.
3,700 ft.
88 ft.
40 ft.
3,828 ft.
10.26
0.05
7ogetEter
•
0.12
101.0
110.8
256
80
94.0
94.0
0.57
7.60
0.76
10.85
0.07
0.14
103.0
113.2
256
90
94.0
94.0
0.71
9.45
0.95
11.46
0.09
0.16
105.2
115.8
256
100
94.0
94.0
0.86
11.48
1.16
12.08
0.11
0.18
107.6
118.6
256
110
94.0
94.0
1.03
13.70
1.38
12.71
0.13
0.21
110.2
121.6
256
120
94.0
94.0
1.21
16.09
1.62
13.36
0.16
0.24
113.1
124.9
256
130
94.0
94.0
1.40
18.65
1.88
14.03
0.18
0.27
116.1
128.3
256
140
94.0
94.0
1.60
21.40
2.15
14.71
0.21
0.30
119.4
132.0
256
150
94.0
94.0
1.82
24.31
2.45
15.40
0.24
0.33
122.8
135.9
256
160
. 94.0
94.0
2.05
27.39
2.76
16.11
0.28
0.37
126.5
139.9
256
170
94.0
94.0
2.30
30.64
3.08
16.84
0.31
0.41
130.3
144.2
256
180
94.0
94.0
2.55
34.06
3.43
17.58
0.35
0.45
134.4
148.6
256
190
94.0
94.0
2.82
37.64
3.79
18.33
0.39
0.49
138.6
153.3
256
200
94.0
94.0
3.10
41.39
4.17
19.10
0.43
0.54
143.1
158.1
256,
256
210
220
94.0
94.0
94.0
94.0
3.39
3.70
45.30
49.37
4.56
4.97
19.88
20.68
0.47
0.52
0.58
0.63
147.7
152.6
163.2
168.4
Flow Increments:
'Y.O` gpm

170.0
165.0
- 160.0
155.0
150.0
145,0
140.0
g 135.0
- 130.0
I- 125,0
120.0
115.0
110.0
105.0
100.0
95.0
90,0
MMMMM • ••, 9999 9 , • 9 99999 99 "f , 999 99999 • 99999999999999 •‘• ••• ••21 99999999 •••• ...... •••••• ............. •••• ........ •
TOR - Station'AAlone— —Pump Curve - Stations Operating Togetheti
1.
r
100
•
105
G. Pump Selection
7.47..4r
110
115
Pump Capacity (Together):
Pump Capacity (Alone):
Motor Horsepower:
Electrical Service:
Impeller Diameter:
110
1
125
•
mroddr...".1
IF
130 135 140 145
FLOW (GPM)
144 gpm @ 133.4 TDH
gpm 6§2 1 ..... 1111-1
affiki:ii.:Migg HP @ tO RPM
460 volt
Flygt Pump - NP3153.181
(See sample pump curve in manufacturer's information attached)
150
155 160 165 170
175 100

FL "
PERFORMANCE CURVE
PRODUCT
N P3153.181
TYPE
SH
DATE
[2007-05-31
POWER FACTOR
EFFICIENCY
MOTOR DATA
PROJECT
1_�c.4: r cam►. 1 .: Z
1/1-LOAD
0.90
911.0 °/n
3/4-LOAD . • 1/2-LOAD RATED •
POWER ..:..
0.87 0.79 STARTING
91.5 % 91.5 % CURRENT...
RATED
CURRENT ...
COMMENTS
INLET OUTLET RATED
SPEED
-I 4 inch TOT.MOM,OF
IMP. THROUGHLET INERTIA •.•
ND. OF
- - BLADES
23 hp
215 A
26 A
3510 rpm •
0.029 kgm2
2
CURVE NO
63-276-00-1078
IMPELLER DIAMETER
155 mm
ISSUE
MOTOR Il STATOR REV
21-18 2BB I o1D 10
FREQ.
60 Hz
PHASES
3
VOLTAGE
460 V
POLES
2
GEARTYPE
RATIO
r
N
co
0
v
}
IL
[hp]
16
IEY 14
0 12
IZ
10
rr
DUTY -POINT
1
B.E.P.
[fil
160
140
120
0
100
w
80
60
40
FLOW(U3gpmt HEAD(ft]
183 124
423 81.2
POWER [hp]
14.8 13.6)
16.8 15.2)
EFF_ [%J NPSHrolni
38.9 (42.4) 13.5
52.6 (57.3) 16.3
NPSHre
[ft]
20
0
10111
11PARVELI
ITI 111. NM
MI IN Ad MI IIMI11E11
• II
0 OVERALL EFF.
0
100 200 300 400 500
NPSHre = t+IPSH3% + min. operational margin
Performance with clear water and ambient temp 40 °C
FLOW
600
40 —
w
1-
m
w
35 r
EFF.
30-- rid
25 — 50
20 40
15 — 30
10 — 20
5--10
0--- 0
[USgpm]
GT
HI B Curve

IrkDICI<SON
community infrastructure consultants
W.K. DICKSON & CO., INC
Community Infrastructure Consultants
401 4th St SW, Suite 201
Hickory, North Carolina 28602
Project: Pratt Industries PS
Owner: Pratt Industries
WKD No: 70205.00.HI
• • Date:. July 11; 2007
Buoyancy Resistance Calculations for 6' Diameter Wetwell with Circular Base
Pump Station "A"
OBJECTIVE;
Determine the base slab thickness (Tb) required to prevent floatation due to the buoyant force from high groundwater,
assumed to be at grade elevation.
GIVEN
Unit weight of water ( Uw)
Unit weight of soil (Us)
Unit weight of concrete (U4)
Grade elevation (ELg)
High groundwater elevation ( EL„„)
Wet well top elevation (ELL )
Top of base slab elevation ( ELb )
Wet well inside diameter ( D )
Top slab thickness (It )
Length of hatch opening ( L )
Width of hatch opening (W )
Wall thickness (TW )
Base slab extension outside of wall (X )
Base slab thickness (Tb )
Fluid height in wet well (Hw)
Weight of pumps (W)
Weight of equipment (We)
CALCULATIONS;
Weight of wet well top (WT, )
Weight of wet well walls (WTW )
Weight of wet well base (WTb )
Weight of dry soil above footing ( )
Weight of wet soil above footing ( WT„„ )
Weight of fluid in wet well (WT)
Weight of pumps and equipment (WTPe)
Downward force ( Ft )
Downward force (F2 )
Downward force ( F3)
Uplift force ( F„ )
Factor of safety (FS )1
Factor of safety ( FS )2
Factor of safety ( FS )3
°62:4,•{ Ibs/ft'
p
90-0i lbs/ft'
." °1.50.0` 1bs/fe
944.00=feet
944.00 feet
944'Sus feet
feet
6.00rfeet
0.67? feet
3 00 feet
4.O0•feet
O 58 feet
0 58 feet
1'.00) feet
15.0
•700IIbs
feet
500,1lbs
(Top is round.)
t ., „88inches
1 } 36iinches
48j inches
7, inches (per code)
(Base is round.)
(Base is round.)
(Approximate) See Flygt catalog for
(Approximate) similar sized pump.
= U, [ (pi (D/2 + T)` - L W) Tt ] (Top is round.)
= tic [ pi ((D/2 + Tw)` - (D/2)`) (EL,-Tt- ELb)]
U, [ pi (D/2 + Tw + X)` Tb] (Base is round.)
Us I pi ((D/2 + Ty, + X)` - (D/2 + Tw)`) (ELg-ELw)]
[Us - Uw][ pi ((D/2 + Tw + X)` - (D/2 + TT)`) (EL - ELb)]
¶Uwl[ pi ((D/2)2)*Hw]
Wp+ We
WTW+WTb
= WTI + WTW + WTb + WTds + WTws
WTI + WTW + WTb + WTds + WT,,,,S + WT, + WTpe
Uw [ pi ((D12 + Tw)` (EL,- ELb) + (D/2 + Tw + X)` Tb)l
Fi/F„ •
F2/F„
F3/F„
.Notes;
Fi is the downward force of wet well base and walls prior to backfill and compaction.
F2 is the downward force of wet well base, walls and top slab after backfill and compaction.
F3 is the downward force when the wet well is complete and operating.
CONCLUSION;
Since the weight of the structure and the base slab (F2) is greater than or equal to the buoyancy force for the
wetwell, the resistance to buoyant force is provided.
ICE
2,834
38,607
8,168
8,376
2,646
1,200
I 46,775
5 7, 985
61,831
57,517
0.81
1.01
1.08

DIAGRAM;