WQ0040097_Application_20180625

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McKIM&CREED
8020 TOWER POINT DRIVE, CHARLOTTE, NC 28227
TEL [phone] • FAX [phone]
LETTER OF TRANSMITTAL
ADDRESS: NCDEQ/DWR
512 N. Salisbury Street, Suite 925
Raleigh, NC 27604
ATTENTION: Water Quality Permitting
PERCS Unit
DATE: 06/07/2018
PROJECT a: 01432-0071
TASK #: 400
RE: McAlpine Creek Relief Sewer - Phase 4
TRANSMITTALti:
PAGE OF
WE ARE SENDING: ® Originals ® Prints ❑ Shop Drawings ❑ Samples
® Specifications ® Calculations ❑ Other -
Quantity
Drawing No.
Rev.
Description
Status
1
Cover Letter
G
1
Original Signed Application Form SSEA 04-16
G
1
Copy of Signed Application Form SSEA 04-16
G
1
Check for the Application Fee in the amount of $480.00
G
2
Flow Tracking/Acceptance Form FTSE 04-16
G
2
Plans, Final Design — Not for Construction
G
2
Specifications, Final Design — Not for Construction
G
2
USGS Quadrangle Map of Project Location
G
2
FONSI for the Project
2
Engineering Calculations
G
Issue 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 Remarks
REMARKS: R E D
JUN 00 2018
DENR-LAND QUALITY
STORMWATER PERMITTINd

CC: Amy Vershel, PE McKIM & CREED, INC.
Charles E. Shue, PE
Signed
acha rammel, PE

State of North Carolina
DWR Department of Environmental Quality
Division of Water Resources
15A NCAC 02T .0300 — SEWER SYSTEM EXTENSION APPLICATION
Division of Water Resources ,,vv``,,� //^^ SSEA 04-16 & SUPPORTING DOCUMENTATION
Application Numberl''� //�LtNM6? (to be completed byDWR)
I. APPLICANT INFORMATION:
1. Applicant's name: Charlotte Water
2. Applicant type: ❑ Individual ❑ Corporation ❑ General Partnership ❑ Privately -Owned Public Utility
❑ Federal ❑ State M Municipal ❑ County
3. Signature authority's name: Joseph C. Wilson per 15A NCAC 02T .0106(b) RECEIVEDINCDENRIDWR
Title: Chief Engineer
JUN ; 1 2018
4. Applicant's mailing address: 5100 Brookshire Boulevard
City: Charlotte State: NC Zip: 28216-3371 WOROS
5. Applicant's contact information: MOORESVILLE REGIONAL OFFICE
Phone number: [phone] Email Address:
It. PROJECT INFORMATION:
1. Project name: McAlpine Creek Relief Sewer - Phase 4
2. Application/Project status: M Proposed (New Permit) ❑ Existing Permit/Project
3. If a modification, provide the existing permit number: W000 and issued date:
4. If new construction but part of a master plan, provide the existing permit number: W000
5. County where project is located: Mecklenburg
6. Approximate Coordinates (Decimal Degrees): Latitude: 35.16090 Longitude:-80.7346o
111. CONSULTANT INFORMATION:
1. Professional Engineer: Charles E. Shoe License Number: 10142
Firm: McKim & Creed, Inc.
Mailing address: 8020 Tower Point Drive
City: Charlotte State: NC Zip: 28227-7726
Phone number: [phone] Email Address: [e-mail]
IV. WASTEWATER TREATMENT FACILITY (WWTF) INFORMATION:
I. Facility Name: McAlpine Creek W WMF Permit Number: NCO024970
Owner Name: Charlotte Water
V. RECEIVING DOWNSTREAM SEWER INFORMATION:
I. Permit Number(s): W00035676
System Wide Collection System Permit Number(s): WQCS00001
Owner Name(s): Charlotte Water
FORM: SSEA 04-16 Page I of 6

VI. GENERAL REQUIREMENTS
I. If the Applicant is a Privately -Owned Public Utility, has a Certificate of Public Convenience and Necessity been submitted?
❑ Yes [:]No ®N/A
2. If the Applicant is a Developer of lots to be sold, has a Developer's Operational Agreement (FORM: DEV) been submitted?
❑ Yes ❑No ®N/A
3. If the Applicant is a Home/Property Owners' Association, has an Operational Agreement (FORM: HOA) been submitted?
❑ Yes ❑No ®N/A
4. Origin of wastewater: (check all that apply):
® Residential Owned ® Retail (stores, centers, malls) ❑ Car Wash
® Residential Leased ❑ Retail with food preparation/service ❑ Hotel and/or Motels
® School / preschool / day care ❑ Medical / dental / veterinary facilities ® Swimming Pool /Clubhouse
❑ Food and drink facilities ® Church ❑ Swimming Pool/Filter Backwash
® Businesses / offices / factories ❑ Nursing Home ❑ Other (Explain in Attachment)
5. Is/was an Environmental Assessment required under 15A NCAC 0IC? ® Yes ❑ No
If yes, submit the appropriate final environmental document (FONSI, ROD, etc.)
6. Nature of wastewater: 100 % Domestic/Commercial % Other waste — specify: _
Industrial (See 15A NCAC 02T .0103(20))
7. Wastewater generated by project: 0 GPD (per 15A NCAC 02T .0114)
Has a flow reduction been approved under 15A NCAC 02T .0I 14(f)? ❑ Yes ® No
If yes, provide a copy of flow reduction approval letter
8. Summarize wastewater generated by project:
Establishment Type
Daily Design Flow "b
No. of Units
Flow
gal/
GPD
gal/
GPD
gal/
GPD
gal/
GPD
gal/
GPD
gal/
GPD
Total
GPD
a See 15A NCAC 02T .0114(b), (d). (e)(1) and (e)(2) for caveats to wastewater design flow rates (i.e., minimum flow per
dwelling; proposed unknown non-residential development uses; public access facilities located near high public use
areas; and residential property located south or east of the Atlantic Intracoastal Waterway to be used as vacation rentals
as defined in G.S. 42A-4).
b Per 15A NCAC 02T .0114(c), design flow rates for establishments not identified below shall be determined using
available flow data, water using fixtures, occupancy or operation patterns, and other measured data.
FORM: SSEA 04-16 Page 2 of 6

VII. GRAVITY SEWER DESIGN CRITERIA - 15A NCAC 02T.0305:
1. Summarize Gravity Sewer to be permitted:
Size (inches)
Length (feet)
Material
36
6,047
PVC, DIP, FRPMP
30
10,504
PVC, DIP, FRPMP
Vill. PUMP STATION DESIGN CRITERIA— 02T .0305 & MDC (Pump Stations/Force Mains):
COMPLETE FOR EACH PUMP STATION INCLUDED IN THIS PROJECT
1. Pump station number or name:
2. Approximate Coordinates (Decimal Degrees): Latitude: Longitude: - °
3. What is the nearest 100-year flood elevation to the facility? feet mean sea level. Source:
Is any of the proposed project located within the 100-year flood plain? ❑ Yes ❑ No
4. If Yes, are the following items provided per 15A NCAC 02T .0305(e):
Water -tight seals on all station hatches and manholes; and
Control panels vents extend two feet above the 100-year flood plain elevation?
❑ Yes ❑ No ❑ N/A
If No, what measures are being taken to protect them against flooding?
5. Finish grade elevation of the pump station:
6. Design flow of the pump station: millions gallons per day (firm capacity)
7. Operational point(s) of the pump(s): gallons per minute at feet total dynamic head (TDH)
8. Number of pumps provided:
9. Number of pump cycles at average daily flow: cycles per hour
10. Power reliability in accordance with 15A NCAC 02T .0305(h)(1):
❑ Standby power source or pump with automatic activation and telemetry - 15A NCAC 02T .0305(h)(1)(B)_
➢ Required for all pump stations with an average daily flow greater than or equal to 15,000 gallons per day
Must be permanent to facility
Or if the pump station has an average daily flow less than 15,000 gallons per day:
❑ Portable power source with manual activation, quick -connection receptacle and telemetry - 15A NCAC 02T
.0305(h)(1)(C)
or
❑ Portable pumping unit with plugged emergency pump connection and telemetry - 15A NCAC 02T .0305(h)(1)(C):
➢ It shall be demonstrated to the Division that the portable source is owned or contracted by the applicant (draft agreement)
and is compatible with the station.
➢ If the portable power source or pump is dedicated to multiple pump stations, an evaluation of all the pump stations'
storage capacities and the rotation schedule of the portable power source or pump, including travel timeframes, shall be
provided in the case of a multiple station power outage.
FORM: SSEA 04-16 Page 3 of 6

Vill. PUMP STATION DESIGN CRITERIA (continued)
11. Summarize the pump station design elements:
Design Element
Plan Sheet
Reference
Specification
Reference
Power Reliability Source and Associated Elements
Screened Wet Well Vent
Check Valves, Gate Valves, etc.
Control Panel
Restricted Access Elements (Fence, Wet Well Lock, etc)
Audible and Visual Alarms
Telemetry/SCADA
Level Controls
Weatherproof Sign with Required Information
Air Relief Valves
12. Summarize the force main to be permitted:
Size (inches)
Length (feet)
Material
High
Elevation (feet)
Discharge
Elevation (feet)
Pump -Off
Elevation (feet)
13. Air release valve station locations per 15A NCAC 02T .0305(i):
Air Release Valve # Station Plan Sheet Reference
FORM: SSEA 04-16 Page 4 of 6

IX. SETBACKS & SEPARATIONS — (02B .0200 & 15A NCAC 02T .0305(f)):
1. Does the project comply with all separations found in 15A NCAC 02T .0305(fl & (g)
➢ 15A NCAC 02T.0305 contains minimum separations that shall be provided for sewers stems:
® Yes ❑ No
Setback Parameter*
Separation Required
Storm sewers and other utilities not listed below (vertical)
24 inches
Water mains (vertical -water over sewer including in benched trenches)
18 inches
Water mains (horizontal)
10 feet
Reclaimed water lines (vertical - reclaimed over sewer)
18 inches
Reclaimed water lines horizontal - reclaimed over sewer)
2 feet
**Any private or public water supply source, including any wells, WS-I waters of Class I or
Class II impounded reservoirs used as a source of drinking water
100 feet
**Waters classified WS (except WS-1 or WS-V), B, SA, ORW, HQW, or SB from normal
high water (or tide elevation) and wetlands (see item IX.2)
50 feet
**Any other stream, lake, impoundment, or ground water lowering and surface drainage
ditches
10 feet
Any building foundation
5 feet
Any basement
10 feet
Top slope of embankment or cuts of 2 feet or more vertical height
10 feet
Drainage systems and interceptor drains
5 feet
Any wimming pools
10 feet
Final earth grade (vertical)
36 inches
➢ 15A NCAC 021,9305(e) contains alternatives where separations in 02T.0305(f) cannot be achieved.
➢ **Streaiii classifications can be identified using the Division's NC Surface Water Classifications webnaee
➢ Ifno`ncompliance with 02T.0305(f) or (a). see Section X of this application
2. Does the project comply with separation requirements for wetlands? (50 feet of separation) ® Yes [-]No ❑ N/A
➢ See the Division"s draft separation requirements for situations where separation cannot be meet
➢ No variance is lequireO ifthe alternative design criteria specified is utilized in design and construction
➢ As built documents should reference the location of areas effected
3. Does the project comply with setbacks found in the river basin rules per 15A NCAC 02B .0200? ® Yes ❑ No ❑ N/A
➢ This would include Trout Buffered Streams per 15A NCAC 2B.0202
4. Does the project require coverage/authorization under a 404 Nationwide or ® Yes ❑ No
individual permits or 401 Water Quality Certifications?
➢ Information can be obtained from the 401 & Buffer Permitting Branch
5. Does project comply with 15A NCAC 02T.0105(c)(6) (additional permits/certifications)? ® Yes ❑ No
Per 15A NCAC 02T.0105(c)(6), directly related environmental permits or certification applications are being prepared, have
been applied for, or have been obtained. Issuance of this permit is contingent on issuance of dependent permits (erosion and
sedimentation control plans, stormwater management plans, etc.).
6. Does this project include any sewer collection lines that are deemed "high -priority?"
Per 15A NCAC 02T.0402, "high -priority sewer" means "any aerial sewer, sewer contacting surface waters, siphon, or sewer
positioned parallel to streambanks that is subject to erosion that undermines or deteriorates the sewer.
❑ Yes ® No
➢ If yes, include an attachment with details for each line, including type (aerial line, size, material, and location).
High priority lines shall be inspected by the permittee or its representative at least once every six -months and
inspections documented per 15A NCAC 02T.0403(a)(5) or the permitee's individual System -Wide Collection permit.
FORM: SSEA 04-16 Page 5 of 6

IX. CERTIFICATIONS:
1. Does the submitted system comply with 15A NCAC 02T, the Minimum Design Criteria for the Permitting of Pump Stations
and Force Mains (latest version), and the Gravity Sewer Minimum Design Criteria (latest version) as applicable?
® Yes ❑ No
If No, complete and submit the Variance/Alternative Design Request application (VADC 10-14) and supporting documents
for review. Approval of the request is required prior to submittal of the Fast Track Application and supporting
documents.
2. Professional Engineer's Certification:
I, C k t I• le' C , Shw ei attest that this application for
(Professional Engineer's name from Application Item 111.1.)
Me A,Io *tee_ C?oe- L RPIio C o�vqix)er —
name from AnDlication Item II.
has been reviewed by me and is accurate, complete and consistent with the information supplied in the plans, specifications,
engineering 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 this application package and its instructions, as
well as all applicable regulations and statutes. Although other professionals may have developed certain portions of this
submittal package, 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 General Statutes 143-215.6A and 143-215.6B, any person who knowingly makes any false
statement, representation, or certification in any application package 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.
North Carolina Professional Engineer's seal, signature, and date:
3. Applicant� Certification per 15A NCAC 02T .0106(b):
attest that this application for
(Signature Authority's name & title from Application Item I.3.)
(Facility name from Application Item II.1.)
has been reviewed by me and is accurate and complete to the best of my knowledge. I understand that any discharge of
wastewater from this non -discharge system to surface waters or the land will result in an immediate enforcement action that
may include civil penalties, injunctive relief, and/or criminal prosecution. I will make no claim against the Division of Water
Resources should a condition of this permit be violated. I also understand that if all required parts of this application package
are not completed and that if all required supporting information and attachments are not included, this application package
will be returned to me as incomplete.
NOTE — In accordance with General Statutes 143-215.6A and 143-215.6B, any person who knowingly makes any false
statement, representation, or certification in any application package shall be guilty of a Class 2 misdemeanor, which may
include a fine not e�ce�e $10,000 as well as civil penalties up to $25,000 per violation.
Signature, � / Date:
FORM: SSEA 04-16 Page 6 of 6

v� MCIQM&CREED
June 7, 2018
NCDEQ/DWR
Water Quality Permitting
PERCS Unit
512 N. Salisbury St., Suite 925
Raleigh, NC 27604
ENGINEERS
S U R V E Y O R S
P L A N N E R 5
r 01432-0071
REC�1VFD
JIIN 08 1DiD
STORMWq ER PERTY
I
MTTING
RE: Application for Permit SSEA 04-16
McAlpine Creek Relief Sewer - Phase 4
Charlotte Water Project No. 7030600020-16-505
Dear Water Quality Reviewer:
On behalf of Charlotte Water we are submitting plans, specification and other
supporting documentation for the construction of the McAlpine Creek Relief
Sewer - Phase 4 for review and approval. The project consists of approximately
17,000 linear feet (LF) of 36-inch to 30-inch relief sewer along McAlpine Creek,
beginning near Independence Boulevard (US HWY 74) and extending upstream
to Lawyers Road (SR 3128). This project will provide added hydraulic capacity to
handle system growth and wet weather flows, including the elimination of
several existing aerial sewer crossings.
We are including the following:
1) Original and one copy of the application form SSEA 04-16
2) $480.00 application fee
3) Two copies of Flow Tracking/Acceptance for Sewer Extension Permit
Applications from Charlotte Water
4) Two sets of plans and specifications
8020 Tower Po i n I U r i v e 5) Two copies of the USGS Topo Quadrangle Map showing the location of
the project
Charlotte, NC 28227 6) Two copies of the FONSI for the project
7) Engineering Calculations
704. 841.2588
Fax [phone]
..,.m.a,cklmcreed. corn

Interconnections to the proposed relief sewer from existing smaller diameter
tributary sewers will also be constructed as part of this project and are being
permitted locally with Charlotte Water. Plan sheets showing the detailed plans
for these interconnections have been omitted from this submittal for this reason.
If you have questions or need additional information, please feel free to contact
me at 704-841-2588 or by e-mail at [e-mail]. We look
forward to your prompt review and approval of these documents.
Respectfully,
M�cKIM &CREED, Inc.
a�G c ammel, PE
Project Engineer
cc: Amy Vershel, PE Charlotte Water
Charles E. Shue, PE McKim & Creed, Inc.
49� MCKIM&CREED

State of North Carolina
Department of Environmental Quality
Division of Water Resources
„ , _„ Flow Tracking/Acceptance for Sewer Extension Applications
(FTSE 04-16)
Entity Requesting Allocation: Charlotte Water
Project Name for which flow is being requested: McAlpine Creek Relief Sewer Phase 4
More than one FTSE may be required for a single project if the owner afthe PVWTP is not responsible far all pump
stations along the route of the proposed wastewater flow.
I. Complete this section only if you are the owner of the wastewater treatment plant.
a. WWTP Facility Name: McAlpine Creek, Irwin Creek, Sugar Creek WWTP
b. WWTP Facility Permit #: NC0024970, NC0024945, NC0024937
All flows are in MGD
c. WWTP facility's permitted flow 99.000
d. Estimated obligated flow not yet tributary to the WWTP 12.614
e. WWTP facility's actual avg. flow 65.432
f. Total flow for this specific request
g. Total actual and obligated flows to the facility
h. Percent of permitted flow used
0.000
78.047
78.8%
It. Complete this section for each pump station you are responsible for along the route of this
proposed wastewater flow.
List pump stations located between the project connection point and the WWTP:
(A) (B)
(C) (D)=(B+C)
(E)=(A-D)
Design
Obligated,
Pump Average Daily Approx.
Not Yet Total Current
Station Firm Flow** Current Avg.
'tributary Flow Plus
(Name or Capacity, * (Firm / pi), Daily Flow,
Daily Flow, Obligated
Available
Number) MOD MGD MGD
MOD Flow
Capacity***
* The Firm Capacity of any pump station is defined as the maximum pumped flow that
can be achieved with the largest pump taken out of service.
** Design Average Daily Flow is the firm capacity of the pump station divided by a peaking
factor (pf) not less than 2.5.
*** A Planning Assessment Addendum slrall be attached for each pump station located
between the project connection point and the WWTP where the Available Capacity is <0.
Downstream Facility Name (Sewer): McAlpine Creek Relief Sewer Ph III
Downstream Permit Number: WQ 0035676
Page I of 6
FTSE 04-16

III. Certification Statement:
I Carl Wilson certify to the best of my knowledge that the addition of
the volume of wastewater to be permitted in this project has been evaluated along the route to the
receiving wastewater treatment facility and that the flow from this project is not anticipated to
cause any capacity related sanitary sewer overflows or overburden any downstream pump station
en route to the receiving treatment plant under normal circumstances, given the implementation
of the planned improvements identified in the planning assessment where applicable. This
analysis has been performed in accordance with local established policies and procedures using
the best available data. This certification applies to those items listed above in Sections I and II
plus all attached planning assessment addendums for which I am the responsible party.
Signature of this form indicates acceptance of this wastewater flow.
Signing Jgffieial Signature
Page 2 of 6
FTSF. 04-16

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FINDING OF NO SIGNIFICANT IMPACT
Environmental Assessment for the McAlpine Creek Relief Sewer
Charlotte -Mecklenburg Utilities
Pursuant to the requirements of the North Carolina Environmental Policy Act (N.C.G.S. § 113A-1, et
seq.), an environmental assessment (EA) has been prepared for the construction of a gravity relief sewer
to serve the McAlpine, Six Mile, Four Mile, and Crooked Creek Basins in Mecklenburg County,
Governmental bodies with jurisdiction over the service area include Charlotte -Mecklenburg County, and
the Towns of Mint Hill and Matthews. The project consists of the following major elements: installation
of approximately 79,000 linear feet of sewer along McAlpine Creek, elimination of a force main and
pump station at the Four Mile Creek confluence, and elimination of approximately 31 existing lateral
sewer aerial crossing of McAlpine Creek. The proposed relief sewer will convey wastewater to the
McAlpine Creek Wastewater Treatment Plant.
The project is necessary to reduce/eliminate wet -weather overflows in the existing system and to
accommodate predicted growth. Although adjacent to basins identified as having habitat suitable for the
Carolina Heelsplitter, a federally listed freshwater mussel, Charlotte Mecklenburg Utilities has no specific
plans to provide service to such areas via the project at present.
The "no -action" alternative was eliminated from consideration, since it would not be, reasonable or
feasible given the insufficient capacity of the existing system, ongoing impacts of sanitary sewer
overflows, and anticipated growth in the service area. During the project preliminary design phase a
review of various alignment alternatives were reviewed to minimize construction impacts and maximize
project benefits. Detailed information about the project's alignment and configuration are contained
within the EA.
The project has been aligned taking into account associated engineering design requirements and the
avoidance and/or minimization of environmental constraints as well as cultural constraints. During
construction, an approved Sediment and Erosion Control Plan will be utilized to prevent exceedences of
the established turbidity water quality standard. Following completion of construction activities, the
project area will be restored. Efforts will be made to minimize the removal of trees from the project area.
Detailed discussion of the project's direct impacts and efforts to mitigate them are included in the EA.
Secondary and cumulative environmental impacts may result from the McAlpine Creek Relief Sewer
project. Mitigation for such impacts will be provided by various ordinances and land development
regulations implemented and enforced by the aforementioned local government jurisdictions. These
include, stormwater, floodplain management, and riparian buffer protection measures. All measures are
described in detail within the EA.
Based on the findings of the EA and on the impact avoidance/mitigation measures contained therein, the
Division of Water Quality has concluded that the proposed project will not result in significant impacts to
the environment. This EA and Finding of No Significant Impact are prerequisites for the issuance of
Division of Water Quality permits necessary for the project's construction. An Environmental Impact
Statement will not be prepared for this project. This FONSI completes the environmental review record,
which is available for inspection at the State Clearinghouse.
North Carolina Department of Environment and Natural Resources
Division of Water Quality
10 March 2006

McAlpine Creek Relief Sewer — Phase 4
Sewer Calculations
April 2018
1) Manhole Buoyancy Calculations
2) Pipe Buoyancy Calculations
3) Sanitary Sewer Hydraulics
3.a) Existing Outfall Sewer
3.b) Relief Sewer
3.c) Downstream Sewer (WQ0035676)
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Manhole Buoyancy Calculations
Job: McAlpine Creek Relief Sewer
- Phase 4
Manhole Type: Deepest 5' diameter manhole in project - See MH#61 on Plan Sheet 4
Worst case scenario: Groundwater level at surface
MH#61
MH
MH Depth
Density of
Density of
Dry Density
MH Dia.
MH Dia.
Bottom
MH Base
Below
Concrete
Water
of Soil
(Inside-ft)
(Outside-ft)
Height (ft)
(ft)
Diameter
Surface ft
(lb/ftA3)
(lb/ftA3)
(Ibs/ftA3)
5
5.833
35.8
0.5
6.833
33.7
150
1 62.4
96.8
Find Total Uplift Force
U = void space x density of water
MH Hydrostatic Uplift Force, U1
56,233.57 Ibs
Base Hydrostatic Uplift Force, U2
1,144.22 Ibs
U = total Uplift Force (U1+U2)
57,377.79 Ibs
Find Total Weight of Manhole and Soil, W
Weight of Manhole, W1
38,083.15 Ibs
W1 = 4' Dia. Manhole, including base
Dry Unit Weight of Soil, W2
32,472.46 Ibs
W2 = Soil Overburden on MH base lip
Concrete Bench, W3
4,417.86 Ibs
W3 = Concrete bench for a 36-inch dia. Pipe
Total W =
74,973.47 Ibs
Results
Difference W - U
17,595.68 Ibs
Safety Factor
1.31
*Therefore Manhole is sufficient to resist hydrostatic uplift

Manhole Buoyancy Calculations
Job: McAlpine Creek Relief Sewer
- Phase 4
Manhole Type: Square Diversion Structure near Lawyers Rd - See Plan Sheet 18 & Detail Sheet C
Worst case scenario: Groundwater level at surface
Diversion Structure
MH
MH
MH
MH Depth
Density of
Density of
Dry Density
Width
Length/th/Width
Leng
Bottom
MH Base
Below
Concrete
Water
of Soil
(Inside-ft)
(Outside-ft)
Height (ft)
(ft)
Length/Width
Surface (ft)
(Ib/ftA3)
I
Ib/ftA3
(Ibs/ftA3)
8
9.333
11.9
1
10.333
8.6
150
62.4
96.8
Find Total Uplift Force
U = void space x density of water
MH Hydrostatic Uplift Force, U1
46,747.31 Ibs
Base Hydrostatic Uplift Force, U2
6,662.93 Ibs
U = total Uplift Force (U1+U2)
53,410.24 Ibs
Find Total Weight of Manhole and
Soil, W
Weight of Manhole, W1
57,339.33 Ibs
W1 = 8' diameter diversion Structure, including base
Dry Unit Weight of Soil, W2
16,372.11 Ibs
W2 = Soil Overburden on MH base lip
Concrete Bench, W3
14,400.00 Ibs
W3 = Concrete bench for a 36-inch dia. Pipe
Total W =
88,111.44 Ibs
Results
Difference W - U
34,701.20 Ibs
Safety Factor
1.65
'Therefore Diversion Structure is sufficient to resist hydrostatic uplift

Pipe Buoyancy Calculations
Job: McAlpine Creek Relief Sewer - Phase 4
Pipe Diameter: 30-Inch PVC Gravity Sewer Pipe
Given Info:
Worst case scenario: Groundwater level at surface
30-Inch Pipe, Wpipe (lb/ft) = 88.49 *ejprescott.com & jmeagle.com - C900 DR 25
Unit weight of water, b (lb/ftA3) = 62.4
Wet unit weight of soil, bw (Ib/ftA3) = 120
Dry unit weight of soil, bd (lb/ftA3) = 96.8
Outside Diameter, D (inches) = 32 *dpcpipe.com & jmeagle.com
Depth of dry soil, Hdry (ft) = 0
*Unit weights for soil from LAW report
Find:
Hydrostatic uplift force, U
Weight of soil overburden (lb/If), Wsoil
Depth of submerged soil over top pipe (ft), Hsub
Calculations:
U = (3.14*DA2)/4*62.4 = 348.51
Find minimum cover to prevent uplift.
From equation Wsoil=6d*Hdry*D+(6w-6)(Hsub+0.1073D)D
Breakdown 1
bd*Hdry*D = 0.00
(bw-b)D = 153.60
(Hsub+0.1073D) = 0.29
Breakdown 2
153.60 (Hsub+0.1073D) = 153.60 Hsub+ 43.95
Wsoil = 153.60 Hsub+ 43.95
Wsoil + Wpipe = U
Wsoil = U - Wpipe
Wsoil = 260.02
Hsub = 1.41 Minimum cover in feet to prevent hydrostatic uplift
* With lower limit covers near 7' hydrostatic uplift is negligible

Pipe Buoyancy Calculations
Job: McAlpine Creek Relief Sewer - Phase 4
Pipe Diameter: 36-Inch PVC Gravity Sewer Pipe
Given Info:
Worst case scenario: Groundwater level at surface
36-Inch Pipe, Wpipe (lb/ft) = 128.41 *ejprescott.com & jmeagle.com - C900 DR 25
Unit weight of water, b (lb/ftA3) = 62.4
Wet unit weight of soil, bw (lb/ftA3) = 120
Dry unit weight of soil, 6d (lb/ftA3) = 96.8
Outside Diameter, D (inches) = 38.3 *dpcpipe.com & jmeagle.com
Depth of dry soil, Hdry (ft) = 0
*Unit weights for soil from LAW report
Find:
Hydrostatic uplift force, U
Weight of soil overburden (lb/If), Wsoil
Depth of submerged soil over top pipe (ft), Hsub
Calculations:
U = (3.14*DA2)/4*62.4 = 499.24
Find minimum cover to prevent uplift.
From equation Wsoil=6d*Hdry*D+(6w-6)(Hsub+0.1073D)D
Breakdown 1
bd*Hdry*D = 0.00
(6w-6)D = 183.84
(Hsub+0.1073D) = 0.34
Breakdown 2
183.84 (Hsub+0.1073D) = 183.84 Hsub+ 62.96
Wsoil = 183.84 Hsub+ 62.96
Wsoil + Wpipe = U
Wsoil = U - Wpipe
Wsoil = 370.83
Hsub = 1.67 Minimum cover in feet to prevent hydrostatic uplift
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