WQ0042824_More Information (Received)_20240910

v MgKIM&CRE
Dept ofEnvuorunental Quality
SEP 10 2024
E N G I N I C R S
SURVIVORS
PLANNERS
September 10, 2024 Raleigh Regional Office M&C 01561-0015
Regional Supervisor
NCDEQ - Water Quality Regional Operations Section
3800 Barrett Drive
Raleigh, North Carolina 27609
RE- Village South Pump Station & Utilities
System No.: NC0020354, Town of Pittsboro
Permit No.: WQ0042824
To whom this may concern:
Enclosed please find the Engineer's Partial Certification for the Village South Pump
Station & Utilities project, as required by the Fast Track Permit issued under permit
no. WQ0042824, dated October 22, 2021.
Items previously certified: none
Items being certified as part of this Partial Certification:
• Gravity sewer
o Approximately 30 linear feet of 12-inch sanitary sewer from wet well
to MH 1. This section of sewer was increased to 12-inches to
account for additional flow from a different direction.
o Approximately 986 linear feet of 8-inch sanitary sewer from MH 1 to
MH7
• Force main
o Approximately 2,480 linear feet of 6-inch PVC force main from the
pump station to existing discharge manhole
• Pump Station
4300 Edwards Mill Rd
Outstanding items remaining for Final Certification:
Shire 200 . Installation of a new MH (MH 1A) and approximately 118 linear feet of 8-
inch gravity sewer that will connect to MH 1 (MH 1 is included in this
Raleigh, lac zz6� z certification) and extend to new MH 1A that is required based on new
upstream gravity sewer location identified during construction.
9 19.233.309 1
www.mcl<imrreed.com
11nrckimereed.com�nasuni1Data; Proj101561100151Wafer%60 ConAdm168 Certificates (Suhst k Partial
Certifications \2024.09.10 Village South Sewer DEQ Fast Tracks, 00 2024.09.09 Eng Final Certification Cover
Letter.docx

Enclosed attachments applicable to Partial Certification:
• Certification Checklist (as needed for applicable partial certification)
• NCDEQ Fast Track Sewer Engineering Partial Certification
• As -Built drawings signed, sealed, and dated by an N.C. PE
• Calculations for pump station
If you have any questions or concerns in regards to the enclosed documents,
please do not hesitate to contact me at [e-mail].
Sincerely,
McKIM & CREED, INC.
Wes Hutchins, PE
Project Manager
cc: Robin Rose
Enclosures
t � MCKLM&CREED

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Village South Pump Station - Surge Pressure Calculations
SURGE PRESSURE CALCULATIONS
Calculates surge pressure in PVC Pipe
Calculations are from PVC Pipe Association, Force Main Design Guide for PVC Pipe
f surge rel of valves are utilized, engineer should review calculations to adjust maximum system pressure based on surge relief setting
Project N- 01561-0015
Project Name: Village South PS
Design check status
1st Desgn Check
PASS
2nd Design [heck
PASS
3rd Design Check
PASS
Design Life Expectancy
PASS 469 years
General Engineer Input
SELECT OR OF PIPE
19
DR
Maximum System Pressure
53
PSI
Maximum FM Ve'oc ty
4
ft/s
Normal System Pressure
41
PSI
Normal FM Velocity
2
ft/s
F,
I 1
Thermal factor
Total Pump Cycle time
I 10
min {pump run + time to R]Ij
Design Checks on next sheet

Vil.age South Pump Station Surge Pressure Calculations
1st Design check
WPm,a <= PC x FT
WP,,,,, 53 is less than or equal to 235
WPm„ 53 psi working pressure during maximum pump operations, psi
PC 235 psi Pressure Class, psi (Appendix Table B.1 of the FM Design Guide for PVC Pipe)
F- 1 Thermal derating factor, dimensionless (Appendix Table B.2)
2nd Design Check
Pntm„) = W P,,,,,,,,o + P,a <= PC x FT
P',im 75.8 is less than or equa: to 235
P,,,m,,, 76 psi maximum pipe pressure from a recurring surge event, psi
WP ama, 41 psi working pressure during normal pump operations, psi
P 35 psi recurring surge pressure, psi (from typical pump on/off operation)
PC 235 psi Pressure Cass, ps, (Appendix Table B-1 of the FM Design Guide for PVC Pipe)
F, 1 Thermal derating factor, dimensionless (Appendix Table 8.2)
3rd Design Check
P,gm„) = W Pm„ + P„ <=1.6 x PC x FT
P m„ 122.6 is less than or equal to 376
P„im,,, 123 psi maximum pipe pressure from an occasional surge event, psi
WPma, 53 psi working pressure dur ng max. mum pump operations, psi
Pam, 70 psi occasional surge pressure, psi (worst -case transient scenario, e.g., power failure)
PC 235 psi Pressure Class, psi {Appendix Table 8.1 of the FM Design Guide for PVC Pipe)
FT 1 Thermal deraf ng factor, dimensionless (Appendix Table 8.2)
all PntmaM) - Pn(min) x (DR - 1)
4
cram, 296 psi Stress amplitude, psi
Pnlma,) 76 psi maximum pipe pressure from a recurring surge event, psi
P tm,ni = WP„ A - P. = 6 psi minimum pipe pressure from a recurring surge event, psi
N = 10'196""ti-pl•1
7.76
N = 24,642,892.36 cycles to failure
Cycle Time 10 min, (pump run time +t me to fill)
n = S2S60 cycles per year
Cyclic Life (years) = N = 468.85 years
n
202