WQCS00055_Collection System Inspection Report Letter_20240701

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S.DANIEL SMITH NORTH CAROi ir,A
Environmental Quality
July 1, 2024
Terrell Blackmon
City Manager
City of Henderson
P.O. Box 1434
Henderson,NC 27536
Subject: Compliance Evaluation Inspection
City of Henderson Collection System
Permit Number WQCS00055
Vance County
Mr. Blackmon:
On June 18, 2024, Donald Smith of the Division of Water Resources (DWR) conducted a
compliance evaluation inspection of the City of Henderson (City) Wastewater Collection System.
Prior to the inspection, progress updates were reviewed for the March 15, 2024, letter from the
DWR regarding wet weather sanitary sewer overflows.The assistance of Lee Owen -Public Works
Director, Joey Long— Public Works Assistant Director,,ORC, Seth Davidson Plant Maintenance
Supervisor, Troy Gooch — Utilities Crew Leader, and Colby Rodgers — Utilities Crew Leader
during the inspection was very helpful and very much appreciated.
Sandy Creek Sewer Shed Wet Weather Sanitary Sewer Overflows
On May 29, 2024, the City of Henderson responded by letter (Attachment A.) to the March 15,
2024, DWR -Wet Weather Sanitary Sewer Overflow information request (Attachment B.). City
staff provided an update for past and proposed inflow and infiltration (I&I) assessment efforts
using smoke testing, dye tracing, acoustic testing, and camera inspections. The city is working
with WK Dickson(engineering consultant)to initiate a"Find-it Fix-it"repair,rehabilitation project
to address I&[ in the Sandy Creek Sewer Basin where notable wet weather sanitary sewer
overflows have occurred.
A pre-construction meeting for the Find-it Fix-it Project was held on March 25, 2024. The Project
included a notice to proceed date of May 13, 2024, and a substantial completion date of May 3,
2025, with a final completion date of June 2, 2026. A project contract cost of$6,149,697.00 using
state funding (SRP-W-0187) is proposed.
The city obtained the services of Hazen (engineering consultant) to perform hydraulic capacity
and condition assessment at the Sandy Creek Pump Station. On April 23, 2024, Hazen performed
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an evaluation and pump field testing. Hazen provided a draft technical memorandum on June 12,
2024 (Attachment C.). The draft assessment provided an overall condition rating of"5" which
was defined in the memo as "equipment that needs immediate replacement (typically not
working)". Some issues identified in the memo included excessive pump vibration, pumps not
achieving design capacity, and hydraulic limitations. The scope of the assessment did not include
evaluation of the Sandy Creek Force Main; however, the memo noted lower observed hydraulic
limitations with a known pressure head may indicate unaccounted for head loss in the force main.
An evaluation of the force main was recommended in the memo to investigate potential causes,
including fats, oils, and grease deposits, air accumulation at high points, and solids accumulations
at low points. Operations staff did indicate to Mr. Smith, notable sediment and debris at times at
the pump station. An inspection of a Sandy Creek force main air release valve (ARV) during the
collection system inspection found a potentially closed or non-operational ARV.
City staff indicated that the Sandy Creek Pump Station and Force Main were not include in the
scope of the Find-it Fix-it Project but would review the technical memo and develop a strategy to
address issues. Special attention should be placed on addressing the pump station deficiencies and
force main assessment given the overall condition rating.
DWR appreciates your attention and continued efforts and progress towards addressing the notable
wet weather sanitary sewer overflows in the City of Henderson.
Wastewater Collection System Inspection Summary/Findings
The following is a list of observations and findings gathered from the inspection:
1. The permit became effective May 1, 2018, and will expire on April 30, 2026. A complete
permit renewal application package will be due by November 2, 2025, 180-days prior to
the permit expiration date_
2. According to city staff, the City's wastewater collection system has approximately 177
miles of gravity sewer(permit currently identifies 147 miles), 15 miles of force main, and
13 duplex pump stations. The city has a population of approximately 15,000 residents.
Please ensure that updated sewer system metrics are provided with your next permit
renewal application.
3. An annual wastewater report for fiscal year (FY) 2023 (July 2022 —June 2023) was not
available for review or available for the city's customers. The city is in violation of Part
IV (3.) — Monitoring and Reporting Requirements in your permit requires that "The
Permittee shall meet the annual reporting and notification requirements provided in North
Carolina General Statues 143-215.1C."
143-215.1 C (a) Report to Wastewater System Customers- - The owner or operator of any
wastewater collection or treatment works, the operation of which is primarily to collect or
treat municipal or domestic wastewater and for which a permit is issued under this Part
and having an average annual flow greater than 200,000 gallons per day, shall provide to
the users or customers of the collection system or treatment works and to the Department
an annual report that summarizes the performance of the collection system or treatment

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works and the extent to which the collection system or treatment works has violated the
permit or federal or State laws, regulations, or rules related to the protection of water
quality. The report shall be prepared on either a calendar or fiscal year basis and shall be
provided no later than 60 days after the end of the calendar or .fiscal year.
4. A Fats, Oil and Grease (FOG) program is implemented and in use. Educational materials
are mailed out once per year to residential and food service establishments with a sewer
use public education team being developed. Part 1 (4) of your collection system permit
requires "The Permittee to develop and implement an educational fats, oils, and grease
program that shall include at least semiannual distribution of educational material target at
both residential and non-residential users....". Ensure that a semiannual distribution of
educational material is performed. Documentation of outreach in addition to any
printed informational mailings such as access to website/electronic information,
informational booths, advertising, or other public education efforts may account for
outreach distribution. The city currently has 95 food service establishments in its FOG
program and conducts approximately 5 grease trap and facility inspections every two
weeks. Grease traps are required to be cleaned every 30-days.
5. The collection system has a FY 2024 annual operating budget of$1,043,475 and a sewer
system Capital Improvement Plan (CIP) of$7,240,000 for FY 2021 to FY 2024. The CIP
included appropriations through 2030 on sewer inflow and infiltration rehabilitation, Sandy
Creek Pump Station Force Main and WRF equipment.
6. Sanitary sewer overflow (SSO) cleanup, pumping, and reporting procedures, which
includes a response action plan was up to date. There have been 53 reportable SSO that
have occurred between January 1, 2022, and May 30, 2024, totaling 1.06 million gallons.
Approximately 40 percent of the SSO occurred in proximity to Rock Mill Road and the
Sandy Creek Pump Station (Sandy Creek Sewer Shed). During this same period,
approximately 7910 of the SSO were associated with inflow and infiltration and wet
weather events equaling 0.53 million gallons.The city is actively working with a consultant
and contractors on a project to identify and repair deficiencies found in the overall Sandy
Creek Sewer Shed. The City obtained the services of an engineering consultant to conduct
a condition assessment of the Sandy Creek Pump Station and are currently in review of
that draft assessment and recommendations.
7. Sanitary sewer overflow(SSO)cleanup,pumping,and reporting procedures were reviewed
and meet permit requirements. Records for SSO's are kept for at least three years.The non-
reportable spill logbook was reviewed. Records are being maintained for non-reportable
spills.
8. The collection system map was reviewed and included manhole location, pipe size, pipe
construction material,pipe location, flow direction,approximate age,air release valves and
lift station name, location, and capacity.
9. The collection system maintenance record summary report was reviewed for FY 2022 to
FY 2024. No data was included from November 2022 to June 2023. Staff indicate that
electronic records were lost due to a software issue; however, staff indicate that they are

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collecting and reassembling the information from record files. Following the inspection the
ORC reported to the inspector on June 28,2024,that the city cleaned 17 miles or 12-percent
of the gravity sewer system in FY 2023 and 19 miles or 13-perent in FY 2024.
10. According to city staff,acoustic testing,close circuit television assessments,root treatment,
smoke testing,and hydraulic jetting are utilized in operating and maintaining the collection
system. A current to-date summary of FY2024 sewer maintenance tasks was reviewed for
July 2023 through May 2024.
Maintenance/[ns pection Task Linear Feet
Sewer Line Jetting 100,155
TV Camera Inspection 7,511
Sewer Line Smoke Testing 7,150
Right of Way Inspection 34,479
Sewer Outfall Cutting 71,959
Root Control Foaming 0
1 l. Five(5) lift/pump stations were visited and inspected with the assistance of Seth Davidson
Plant Maintenance Supervisor:
a) Redbud Lift Station — 51 Vance Academy Road
• Lift station discharges to WRF
• Facility is fenced and was secure at the time of the inspection.
• Pump Station identification sign and emergency phone number installed on the
station access gate.
• Automatic Fairfield'.a"bar screen
• Flow equalization basin (100,000 gallons)
• (3) Fairbanks-Morris Pumps(2) 190 Hp (1) 125 Hp
• Indicated pump capacity 190 Hp(2,050 gpm) and 125 Hp (1,200 gpm)
0 At the time of the inspection, the wet well and float controls were clean and clear
of excessive grease and debris.
• High-Level Alarm (audible"visual) was tested and was functional during the
inspection. Alarm was received by WRF staff.
• DRACS RTU radio communications for station monitoring and alarms.
• A dedicated permanent generator onsite. Generator and automatic transfer switch
tested weekly under load.
• Bypass pumping connection installed. Bypass pump was installed and connected
from a recent maintenance project.
• Calcium Nitrate chemical is being fed at this location for odor control.
• Pump station spill response plan was onsite.
• According to Mr. Davidson,the lift station is visited at least 3 times per week.

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b) Sandy Creek Lift Station 482 Rock Mill Road
• Lift station discharges to WRF
• Facility is fenced and was secure at the time of the inspection.
• Pump Station identification sign and emergency phone number installed on the
station access gate.
• (2)250-horsepower Cornell centrifugal pumps
• 2,750 GPM lift station rated capacity. Current capacity is limited to
approximately 1,700 gpm.
• At the time of the inspection, the wet well and float controls were clean and
clear of excessive grease and debris.
• High-Level Alarm (audible,,,visual) was tested and was functional during the
inspection. Alarm was received by WRF staff.
• DRACS RTU radio communications for station monitoring and alarms.
• A dedicated permanent generator onsite. Generator and automatic transfer
switch tested weekly under load. Generator and automatic switch gear were
tested and functioned at the time of the inspection.
• Bypass pumping connection is installed.
a Pump station spill response plan was onsite.
• According to Mr. Davidson, the lift station is visited at least 3 times per week.
c) Harris Street Lift Station - 601 Harris Street
• Lift station discharges to WRF
• Facility is fenced and was secure at the time of the inspection.
• Pump Station identification sign and emergency phone number installed on the
station access gate.
• (2)40 Hp Gorman Rupp pumps
• Indicated lift station capacity 100 gpin.
• Removeable basket screen for large solids management.
• At the time of the inspection, the wet well and float controls were clean and
clear of excessive grease and debris.
• High-Level Alarm (audible,,visual) was tested and was functional during the
inspection. Alarm was received by Mr. Davidson's cell phone.
• 2+2 cellular dialer for station alarm monitoring.
• A generator cannon plug connection is installed for use with a portable
generator. A portable generator is available for use with 5 pump stations with
similar plug connections.
• Bypass pumping connection is installed and available for use with a portable
pump.
• Pump station spill response plan was onsite.
• According to Mr. Davidson, the lift station is visited at least 3 times per week.
d) Martins Creek Lift Station 1416 Rock Mill Road
0 Lift station discharges to Sandy Creek Lift Station

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• Facility is fenced and was secure at the time of the inspection.
• Pump Station identification sign and emergency phone number installed on the
station access gate.
• (2) 40 Hp Gorman Rupp pumps
• Indicated lift station capacity 815 gpm.
• Removeable basket screen for large solids management.
• At the time of the inspection, the wet well and float controls were clean and
clear of excessive grease and debris.
• High-Level Alarm (audible/visual) was tested and was functional during the
inspection. Alarm was received by Mr. Davidson's cell phone.
• 2+2 cellular dialer for station alarm monitoring.
• A dedicated permanent generator onsite. Generator and automatic transfer
switch tested weekly under load. Generator and automatic switch gear were
tested and functioned at the time of the inspection. The generator was slow to
start and Mr. Davidson indicated that he would investigate the reason for the
slow start.
• Pump station spill response plan was onsite.
• According to Mr. Davidson, the lift station is visited at least 3 times per week.
e) Industrial Park Lift Station— 311 Peter Gill Road
0 Lift station discharges to Sandy Creek Lift Station
• Facility is fenced and was secure at the time of the inspection.
• Pump Station identification sign and emergency phone number installed on the
station access gate.
• (2) 30 Hp Hydromatic submersible pumps
• Indicated lift station capacity 300 gpm.
• Removeable basket screen for large solids management.
• At the time of the inspection, the wet well and float controls were clean and
clear of excessive grease and debris.
• High-Level Alarm (audible/visual) was tested and was functional during the
inspection. Alarm was received by Mr. Davidson's cell phone.
• 2+2 cellular dialer for station alarm monitoring.
• A dedicated permanent generator onsite. Generator and automatic transfer
switch tested weekly under load. Generator and automatic switch gear were
tested and functioned at the time of the inspection.
• Bypass pumping connection is installed and available for use with a portable
pump.
• Pump station spill response plan was onsite.
• According to Mr. Davidson, the lift station is visited at least 3 times per week.
12. The spill response plan was available for review and included response procedures and
contact phone numbers for emergency response. A 30-minute response time goal is set to
respond to emergencies. An on-call schedule is established for 24 hour a day emergency
response. After-hour pump station alarms are monitored 24-hours per day by WRF staff
through the SCADA and telemetry dialers.

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13. Pump Station operations and maintenance logs were reviewed and appeared satisfactory.
With pump stations being managed by WRF staff, the collection system ORC should
regularly review operations and maintenance records in addition to all other collection
system records to ensure compliance with the collection system permit.
14. The following collection system sewer lines, high priority lines, and manhole locations
were visited during the inspection.
a.) Redbud Force Main Easement-Tiny Broadwick Road Fairway Drive r" Oxford Road
• 12 and 14-inch force main easement appeared in good condition and accessible.
b.) Redbud Gravity Outfall - Tiny Broadwick Road (High Priority Line)
• Gravity easement in good condition and accessible. Access restricted with a
fence. No issues noted at the time of inspection.
c.) Sandy Creek Force Main Discharge Manhole- Arch Street and South Williams Street.
• 14-inch vitreous clay pipe discharges into receiving manhole. According to the
ORC the force main transitions from cast iron pipe to clay pipe close to the
receiving manhole.
• The brick-and-mortar constructed manhole was in poor condition with
exposed brick and missing mortar. There is evidence of manhole wall
undermining where the wastewater flow enters the receiving gravity sewer
line (Attachment Photo IA.). This manhole should be assessed and
evaluated for rehabilitation or replacement. Continued corrosion or
manhole wall/cone section undermining could lead to a manhole or sewer
line failure.
• All force main receiving manholes or manholes in close proximity to the
receiving manhole should be inspected regularly and assessed for any
needed rehabilitation or replacement.
d.) Sandy Creek Force Main Gravity Sewer Hargrove Street
• 18-inch vitreous clay pipe and manhole were in good condition. Free flowing
with no solids or debris accumulation noted.
• 8-inch sewer main manhole-vitreous clay pipe entering manhole
appeared to have side wall pipe damage. Investigate the extent of damage
to this sewer main and if rehabilitation or replacement is needed.The
pipe was still mostly free flowing with no solids or debris accumulation
noted.
• According to city staff the 8-inch sewer main crosses a known stormwater
culvert that is obstructed and needs culvert repair or replacement.

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e.) Sandy Creek Force Main Air Release Valve (ARV) Manhole - Pinkston Street.
• A directly tapped ARV was observed on a 16-inch ductile iron force main.
• The ARV appeared to contain a gate valve and ball valve for ARV
isolation from the force main. The ball valve handle was perpendicular to
the valve body and appeared to be in a closed position(Attachment Photo
1B.). Please investigate the position of the ARV isolation valve and
ensure the ARV is functioning as the system was designed and engineered
to function and operate.
• All force main ARVs should be maintained and operated as designed and
engineered to function. Inspect all force main ARVs for maintenance
needs and function. Maintain a regular inspection and maintenance
program for the force main valves. Odor and corrosion control may need
to be considered with functional ARVs.
f) Manhole Inspection- East Montgomery Street and South College Street
• 8-inch ductile iron pipe with manhole in good condition, free flowing, with no
solids or debris accumulation noted. Rain-pot installed to reduce inflow.
g.) Martins Creek Outfall 1416 Rock Mill Road(High Priority Line)
• Observed during pump station visit. No issues noted at the time of inspection.
Easement appeared to be maintained and accessible.
15. Easements observed during the collection system inspection appeared to be maintained and
accessible for system inspect ion/maintenance/emergency. The Public Works Director
indicated that the easement mowing and clearing goal of all easements is at least once per
year. Sewer line easement maintenance is generally 30-foot wide.
This office is requesting you respond to this letter in writing. Be sure to specifically address the
bolded items 14 (c.), (d.), and (e.) in your written response by September 30, 2024. DWR file
review and inspection results as detailed above revealed: 1) the Hazen report identified
unaccounted head loss in the Sandy Creek force main; 2) excessive pump vibration, pumps not
achieving design capacity, and hydraulic limitations at the Sandy Creek PS (Hazen June 12,2024);
and 3) on June 18, 2024, DWR inspector identified/encountered a Sandy Creek force main ARV
during the inspection to be potentially closed or non-operational. Accordingly, this office is
requesting that your written response to also include the following:
• Propose a schedule for systemwide force main and ARV field assessments.
• Provide a written accountifindings of the systemwide assessment, following the proposed
scheduled field assessments.
• Develop a reference document or manual of practice for the inspection, maintenance, and
operation for systemwide force mains and ARVs.
• Propose a schedule to address systemwide force main and ARV maintenance needs, and
specifically address/highlight the Sandy Creek force main needs.

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The overall condition of the collection system was marginal with the system issues identified in
this report, the Sandy Creek sewer shed wet weather SSO related deficiencies, and collection
system permit non-compliance observed on the day of the inspection. If you have any questions
concerning this report, please contact Donald Smith at (919) 791-4234 or by e-mail at
[e-mail].
Sincerely,
IOocuSigned by:
va KA,SS0. f. hAVAAd
62916E6AB32144F
Vanessa E. Manuel, Assistant Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
Attachment: Compliance Inspection Report
Attachment A. - Response to Wet Weather SSO Letter
Attachment B. - DWR Wet Weather SSO Response Request Letter
Attachment C. - Hazen Draft Technical Memorandum - Sandy Creek Pump Station
Evaluation
Attachment Photo IA. - Sandy Creek Force Main Receiving Manhole
Attachment Photo 1 B. - Sandy Creek Force Main Air Release Valve
cc: Laserfiche

DocuSign Envelope 1D 6E7CA058-38664C37-A99E-FFD9A31459E3
Compliance Inspection Report
Permit:WOCS00055 Effective: 05/01118 Expiration: 04/30/26 Owner: City of Henderson
SOC: Effective: Expiration: Facility: Henderson Collection System
County: Vance PO Box 1434
Region: Raleign
Henderson NC 275361434
Contact Person:Terrell 8lackmcn Title: City Manager Phone:[phone]
Directions to Facility:
System Classifications: CS3.
Primary ORC:Joey GGambra Long Certification: 990227 Phone:[phone]
Secondary ORC(s):
Troy Lee Gooch 1014371 252-431-6030
Seth Gibbons Davidson 1014833 252-431-6084
Lee Marshall Owen 1011156 252-432-4591
On-Site Representative(s):
Related Permits:
NCO020559 City of Henderson-Henderson Water Reclamation Facility
Inspection Date: 06118/2024 Entry Time 09:45AM Exit Time: 0145PM
Primary Inspector:Donald Smith Docuslpned by: 7/1/2024 Phone: [phone]
Secondary Inspector(s): I
�S'r"'�
512ED5247FA847A
Reason for Inspection: Routine Inspection Type: Collection System Inspect Non Sampling
Permit Inspection Type: Collection system management and operation
Facility Status: ❑ Compliant Not Compliant
Question Areas:
Miscellaneous Questions General Sewer&FOG Ordinances
Capital Improvement Plan Map Reporting Requirements
Inspections Spill Response Plan Spills
Lines Manholes Pump Stations
(See attachment summary)
Page 1 of 7

DocuSign Envelope ID:6E7CA058-3B66-4C37-A99E-FFD9A31459E3
Permit: WOCS00055 Owner-Facility:City of Henderson
Inspection Date: 06/18/2024 Inspection Type:Collection System inspect Non Sampling Reason for Visit: Routine
Inspection Summary:
Overall system condition is marginal with identified system issues and Sandy Creek sewer shed wet weather SSO related
deficiencies. Noncompliant with collection system permit requirement for FY23 annual wastewater report.At the time of the
inspection a portion of FY2023 system maintenance data was not available to review.
Page 2 of 7

DocuSign Envelope ID 6E7CA058-3866AC37-A99E-FFD9A31459E3
Permit: WQCS00055 Owner-Facility:City of Henderson
Inspection Date: 0&1812024 Inspection Type:Collection System Inspect Non Sampling Reason for Visit: Routine
General Yes No NA NE
Is there a properly designated primary ORC and at least one back-up of proper grade? M ❑ ❑ ❑
Are logs being reviewed by the system management or owner on a regular basis ❑ ❑ ❑
#What is that frequency? Daily review and
collaboration
#Are there any issues being addressed currently or any in the planning stages? M ❑ ❑ ❑
Is there a specific pump failure plan available for all pump stations? M ❑ ❑ ❑
Does plan indicate if pump parts/new pumps are in spare parts/equipment inventory? M ❑ ❑ ❑
Are new/significantly upgraded pump stations equipped with anti-corrosion materials? ❑ ❑ 0 ❑
Does the permittee have a copy of their permit? M ❑ ❑ ❑
#Is permit expiring within the next 6 months? ❑ M ❑ ❑
If Yes,has the Permittee applied for renewal? ❑ ❑ N ❑
Comment: Sandy Creek Sewer Shed wet weather SSO being evaluated and addressed through a find-it
fix-it project. Sandy Creek Pump Station condition assessment.
Sewer and FOG Ordinances Yes No NA NE
Is Sewer Use Ordinance(SUO)or other Legal Authority available? M ❑ ❑ ❑
Does it appear that the Sewer Use Ordinance is enforced? M ❑ ❑ ❑
Is there a Grease Control Program that legally requires grease control devices? 0 ❑ ❑ ❑
What is the standard grease trap cleaning requirement in the FOG ordinance? 30 day
Is Grease Control Program enforced via periodic inspections/records review? M ❑ ❑ ❑
Is action taken against violators? so ❑ ❑
#Have satellite systems adopted an equivalent or more stringent ordinance? ❑ ❑ 0 ❑
Is grease/sewer education program documented with req'd customer distribution? 0 ❑ ❑ ❑
#Are other types of education tools used like websites, booths,special meetings,etc? M ❑ ❑ ❑
If Yes,what are they?(This can reduce mailing to annual.)
Sewer use public education team being developed.
Comment: Program only had one distribuiton of FOG education for residential and food service. Other
public education types being developed.
Capital Improvement Plan Yes No NA NE
Has a Capital(CIP)or System Improvement Plan been developed and adopted? M ❑ ❑ ❑
Is it designated for wastewater only or does it have a dedicated section? M ❑ ❑ ❑
Does CIP cover three to five year period of earmarked improvements? 0 ❑ ❑ ❑
Does CIP include description of project area? ❑ ❑ ❑
Does CIP include description of existing facilities? ❑ ❑ ❑
Does CIP include known deficiencies? ❑ ❑ ❑
Does CIP include forecasted future needs? 0 ❑ ❑ ❑
Page 3 of 7

uS gn Envelope ID:6E7CA05B-3B66-4C37-A99E-FFD9A31459E3
Permit: WQCS00065 Owner-Facility:City of Henderson
Inspection Date: 06/18/2024 Inspection Type:Collection System Inspect Non Sampling Reason for Visit: Routine
Comment: CIP identified funding for Sandy Creek Force Main I&I repair, and WRF equipment
Map Yes No NA NE
Is there a overall sewer system map? 0 ❑ ❑ ❑
Does the map include:
Pipe Type(GS/FM) ❑ ❑ ❑
Pipe sizes 0 ❑ ❑ ❑
Pipe materials (PVC, DIP,etc) M ❑ ❑ ❑
Pipe location M ❑ ❑ ❑
Flow direction M ❑ ❑ ❑
Approximate pipe age 0 ❑ ❑ ❑
Pump station ID, location and capacity 0 ❑ ❑ ❑
# Force main air release valve location&type M ❑ ❑ ❑
# Location of satellite connections ❑ ❑ M ❑
Is the map being updated for changes/additions within 1 year of activation? M ❑ ❑ ❑
Comment:
Reporting Requirements Yes No NA NE
#Have there been any sewer spills in the past 3 years? ■ ❑ ❑ ❑
If Yes,were they reported to the Division if meeting the reportable criteria? 0 ❑ ❑ ❑
If applicable,is there documentation of press releases and public notices issued? 0 ❑ ❑ ❑
Is an Annual Wastewater Performance Report being filed with the Division,if required? ❑ M ❑ ❑
Is the report being made available to all its sewer customers? 0 ❑ ❑ ❑
#How is it being made available? Available at Public
Works Department
for customer
pickup
Comment: No annual wastewater report was produced for FY23. ORC indicated that it had not been
developed due to lost data that is being re-assembled.
Inspections Yes No NA NE
Are adequate maintenance records maintained? ■ ❑ ❑ ❑
Are pump stations being inspected at the required frequency? M Cl ❑ ❑
#Is at least one complete functionality test conducted weekly per pump station? M ❑ ❑ ❑
Is there a system or plan in place to observe the entire system annually? 0 ❑ ❑ ❑
Is the annual inspection documented? 0 ❑ ❑ ❑
#Does the system have any high-priority lines/locations? M ❑ ❑ ❑
Are inspections of HPL documented at least every 6 months? M ❑ ❑ ❑
Are new lines being added to the HPL list when found or created? ❑ ❑ ❑ ❑
Comment:
Page 4 of 7

DocuS gn Envelope ID,6E7CA058-3666-4C37-A99E-FFD9A31459E3
Permit: WQCS00055 Owner-Facility:City of Henderson
Inspection Date: 06,1812024 Inspection Type:Cotect in System Inspect Non Sampling Reason for Visit: Routine
Spill Response Action Plan Yes No NA NE
Is a Sp II Response Action Plan available? 0 ❑ ❑ ❑
Is a Sp II Response Action Plan available for all personnel? 0 ❑ ❑ ❑
Does the plan include
24-hour contact numbers 0 ❑ ❑ ❑
Response time N 1300
Equipment list and spare parts inventory N ❑ ❑ ❑
Access to cleaning equipment E ❑ ❑ ❑
Access to construction crews, contractors,and/or engineers N ❑ ❑ ❑
Source of emergency funds E ❑ ❑ ❑
Site sanitation and cleanup materials E ❑ ❑ ❑
Post-overflow/spill assessment N ❑ ❑ ❑
Does the Permittee appear to respond within 2 hours of first knowledge of a spill? IN ❑ ❑ ❑
Comment: Expected response time 30 minutes. Operating budget includes emergency funds or special
appropriations can be made_by council if very expensive.
Spills Yes No NA NE
Is system free of known points of bypass? N ❑ ❑ ❑
If No,descr,be type of bypass and location
Are all spills or sewer related issues/complaints documented? No ❑ ❑
#Are there repeated overflows/problems(2 or more in 12 months)at same location? 0 Cl ❑ ❑
#if Yes, is there a corrective action plan? ❑ ❑ ❑
Comment: A find-it fix-it ro'ect and assessments under way. DWR continuing to monitor corrective
actions for SSO reductions.
Lines/Right-of-Ways/Aerial Lines Yes No NA NE
Please list the Lines/Right of Ways/Aerial Lines Inspected:
Redbud Force Main, Redbud Gravity Outfall,Sandy Creek Force Main, Martins Creek Outfall
Are right-of-ways/easements maintained for full width for access by staff/equipment? 0000
If No,give details on temporary access:
Is maintenance documented? E ❑ ❑ ❑
Are gravity sewer cleaning records available? 00 ❑ ❑
Has at least 10%of lines older than 5 yrs been cleaned annually? ❑ N ❑ ❑
Were all areas/lines inspected free of issues? No ❑ ❑
Comment: FY23 records indicate approximately 1.0% of system cleaned. Maintenance data was missin
due to software data loss. Staff are re-assembling data. Requested updated data when
compiled.
Manholes Yes No NA NE
Page 5 of 7

CocuSign Envelope ID:6E7CA058-3866-4C37-A99E-FF09A31459E3
Permit: WQCS00055 Owner-Facility:City of Henderson
Inspection Date: 06/18/2024 Inspection Type:Collection System Inspect Non Sampling Reason for Visit: Routine
Please list the Manholes Inspected:
Sandy Creek Force Main Discharge Manhole(Arch and S.Williams St), 18 inch interceptor and 8 inch main
on Hargrove St, 8 inch main on E.Montgomery and S.College Street.
Are manholes accessible? 0 ❑ 0 ❑
#Are manhole covers/vents above grade? E 0 ❑ ❑
Are manholes free of visible signs of overflow? E ❑ ❑ ❑
Are manholes free of sinkholes and depressions? 0 ❑ ❑ ❑
Are manhole covers present? N 0 0 []
#Are manholes properly seated? E 0 0 ❑
#Are manholes in good condition? 0 0110
#Are inverts in good condition? 0 ❑ 0 ❑
Is flow unrestricted in manholes? 0 ❑ ❑
Are manholes free of excessive amounts of grease? ■ 0 0 ❑
Are manholes free of excessive roots? 0 ❑ ❑
Are manholes free of excessive sand? N 0 00
Are manhole vents screened? 0
Are vents free of submergence? ■ [] 0 0
Are manholes free of bypass structures or pipes? ■ ❑ 0 ❑
Comment: Sandy Creek Force Main receiving manhole had notable corrosion with loss of grout and
exposed brick built manhole. Manhole wall and cone section appeared to be undermining due
to flow/corrosion. 8-inch sewer main manhole on Hargrove Street, inlet vitreous clay pipe
appeared to have a broken pipe inlet needing further inspection and evaluation.
Pump Stations Yes No NA NE
Please list the Pump Stations Inspected:
Redbud PS, Sandy Creek PS, Harris Street PS,Martins Creels PS, Industrial Park PS
#Number of duplex or larger pump stations in system 13
#Number of vacuum stations in system 5
#Number of simplex pump stations in system 0
#Number of simplex pump stations in system serving more than one building 0
How many pump/vacuum stations have:
# A two-way"auto polling"communication system(SCADA)installed? 2
# A simple one-way telemetry/communication system(auto-dialer)installed? 11
For pump stations inspected:
Are they secure with restricted access? 0 CIO
Were they free of by-pass structures/pipes? 0 ❑ O ❑
Were wet wells free of excessive grease/debris? 0 0 0 ❑
# Do they all have telemetry installed? 0 0 00
Is the communication system functional? E ❑ ❑ 0
Page 6 of 7

DocuSign Envelope ID:6E7CA058-3B66-4C37-A99E-FFD9A31459E3
Permit: WQCS00055 Owner-Facility:City of Henderson
Inspection Date: 06118/2024 Inspection Type:Collection System Inspect Non Sampling Reason for Visit: Routine
Is a 24-hour notification sign posted? 0 ❑ ❑ ❑
Does the sign include:
Owner Name? 0 ❑ ❑ ❑
Pump station identifier? ❑ ❑ ❑
# Address? ❑ ❑ ❑
Instructions for notification? ■ ❑ ❑ ❑
24-hour emergency contact numbers? 0 ❑ ❑ ❑
Are audio and visual alarms present? 0 ❑ ❑ ❑
Are audio and visual alarms operable? 0 ❑ ❑ ❑
#Is there a backup generator or bypass pump connected? ❑ E ❑ ❑
If tested during inspection,did it function properly? 0 ❑ ❑ ❑
Is the back-up system tested at least bi-annually under normal operating conditions? 0 ❑ ❑ ❑
#Does it have a dedicated connection for a portable generator? 0 ❑ ❑ ❑
#Is the owner relying on portable units in the event of a power outage? 0 ❑ ❑ ❑
#If Yes,is there a distribution plan? 0 ❑ ❑ ❑
If Yes,what resources(Units/StaffNehicles/etc)are included in Plan?
5 pump stations have portable generator connections. One portable generator is used among the 5 pump
stations.All pump stations with generator connection also has bypass pump connection. One bypass pump
is available.
#Does Permittee have the approved percentage of replacement simplex pumps? ❑ ❑ ED
Is recordkeeping of pump station inspection and maintenance program adequate? 0 ❑ ❑ ❑
Do pump station logs include at a minimum:
Inside and outside cleaning and debris removal? 0 ❑ ❑ ❑
Inspecting and exercising all valves? ❑ ❑ ❑
Inspecting and lubricating pumps and other equipment? 0 ❑ ❑ ❑
Inspecting alarms,telemetry and auxiliary equipment? 0 ❑ ❑ ❑
Comment:
Page 7 of 7

ATTACHMENT A.
City of Henderson
7 Public Works Department
a T Post Office Box 1434 •900 S. Beckford Drive
Henderson, INC 27536-1434
Phone: [phone] / Fax: [phone]
May 29, 2024
Vanessa Manuel,Assistant Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
1628 Mail Service Center
Raleigh,NC 27699-1628
Re: Response to Wet Weather Sanitary Sewer Overflows
Henderson Wastewater Collection System
Collection System Permit:WQCS00055
Vance County
Dear Ms.Manuel:
I am writing in response to the letter we received on March 25,2024 following a review of Henderson's
sanitary sewer overflow reporting records for January 2022 to January 2024 and a site visit by Donald
Smith and Danny Smith from the Raleigh Regional Office. As requested,below are updates on items 1-4
listed in the letter.
Item#1—Summary of data collection and assessment efforts to identify/&1.
Henderson Public Works has put a lot of effort into finding sources of I&I especially in the Sandy Creek
Sewer Shed.Current staff uses methods such as smoke testing,die testing and CCTV inspection.We
have had success in finding and repairing numerous problems utilizing these methods.Staff at the
Henderson Water Reclamation Facility monitors flow to the plant and all lift stations daily.Average daily
flow into the Sandy Creek Lift Station has been reduced by approximately 600,000 gallons in the last 12
months due to these efforts.
In addition to the work done by Henderson staff we have hired consultants and contractors to help us
with I&I.We are currently working with WK Dickson and HG Reynolds.Sandy Creek Sewer Basin Find-It
Fix-It is a project dedicated to finding and fixing I&I within the Sandy Creek Basin. We have secured$7.5
million in funding for the project.Staff has worked with WK Dickson to assess the Sandy Creek basin
utilizing InfoSense's Sewer Line Rapid Assessment Tool(SL-RAT).A map of this work is attached.This
project is current and ongoing.
Item#2—Hydraulic capacity and condition assessment of Sandy Creek Lift Station.
In 2019 Henderson hired Underwood&Associates to evaluate the pumps and flow rates of the Sandy
Creek Lift Station and force main. During their evaluation,a vibration in one of the pumps lead to finding
a piece of wood wedged in the impellor,which was removed.We scoured the force main and replaced
all ARV's during this time. Underwood &Associates determined the station was performing as designed.
More recently, in April of 2024,Henderson hired Hazen and Sawyer to do an assessment of the Sandy
Creek Lift Station.Their assessment included pump draw downs,vibration analysis, amp loads on the

VFD's,analyzing pump curves,etc...We are still awaiting a report of their findings and will submit as
soon as we receive it.
Item#3—Additional or new monitoring efforts planned to identify sources of W and pinch points.
Henderson Engineering is exploring options for flow monitoring within the collection system starting in
the Sandy Creek Basin.The theory is to place flow monitors at the bottom of sub-basins within the
sewer basins to monitor flow during rain events.Data from the flow monitors should help narrow the
search to our larger problem areas.A preliminary map of flow monitor locations within the Sandy Creek
Basin is attached.
Item#4—Plan and schedule for how acquired funding will be used to abate sewer overflows.
As mentioned above Henderson secured$7.5 million in funding for sewer rehabilitation in the Sandy
Creek Basin.The project name is Sandy Creek Sewer Basin Find-It Fix-it.Attached you will find the pre-
construction meeting minutes which details the scope of the project.
We are dedicated to our collection system being compliance and mitigating SSO's is a top priority.
Please feel free to contact our staff or myself should you need any additional information.We look
forward to your follow up visit June 13`h.
Sincerely,
Lee Owen
Public Works Director
Attachments: SL-RAT Map
Preliminary Flow Monitor Map
Sandy Creek Sewer Basin Find-It Fix-It Pre-Construction Meeting Minutes
CC: Edward Terrell Blackmon,City Manager
Joey Long,Assistant Public Works Director/Utilities Division—Collection System ORC
Christy Lipscomb,Water Resources Director/ORC
File

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City of Henderson,North Carolina

City of Henderson
WK Sandy Creek Basin Sewer Rehabilitation
Find-It Fix-It Project
DDICKSON
WK Dickson Project No.20210293.00.RA
community Infrastructure consultants DWI Project No.SRP-W-0187
Subject: Pre-Construction Meeting
Attendees: Clarissa Lipscomb-City of Henderson
Logan Tendall-City of Henderson
Dale Jones-City of Henderson
Anita Robertson-WK Dickson
Mac Perro-WK Dickson
Matt Beasley-H.G.Reynolds
Nathan Williams-Tri-State Utilities
Brian Guertler-Tri-State Utilities
Jon Moore-Structural Solutions
Bashar Al-Masri-NCDEQ-DWI
Meeting Date: March 25,2024
Meeting Time: 2:00 pm
Date Prepared: April 1,2024
1. Safety Overview
a. H.G. Reynolds Co., Inc. shall be responsible for ensuring all work completed is
performed safely.
b. If confined space entry is required, the Contractor is responsible for completing the
required protocol.
i. The City of Henderson has their own confined space entry permit. Per the City of
Henderson, the Contractor may use their own confined space entry permits but
must provide a copy to the City for record-keeping purposes.
2. Contract Provisions
a. Total agreed upon contract price-$6,149,697.00
b. Anticipated NTP/start date-5/13/2024,begin cleaning and CCTV first
c. Contract duration-720 days (substantial completion),750 days(final completion)
d. Liquidated damages-$500 per calendar day(substantial completion)
$1,000 per calendar day(final completion)
e. Contract Completion Date
i. Substantial Completion:5/3/2026
ii. Final Completion: 6/2/2026
3. Find-it/Fix-it Sequencing
a. Per WK Dickson, cleaning and inspecting trunk lines near the basin's downstream
portion would be the optimal starting point for initiating work. These locations are
ideal as known SSOs have occurred.

City of Henderson
Sandy Creek Basin Sewer Rehabilitation Find-It Fix-It Project
WK Dickson Project No.20210293.00.RA
DWI Project No.SRP-W-0187
i. Manhole inspections will be performed simultaneously with the sewer cleaning
and inspection activities.
ii. Once CCTV footage is reviewed, a determination of whether to line, repair, or
rehabilitation can be made.
b. Following cleaning/inspection on the main trunk lines, cleaning/inspection can be
performed for smaller gravity sewer lines.
4. Contractor/Subcontractors Responsibility Breakdown
a. HG Reynolds—Point repairs, manhole removal and replacement, and replacement of
water mains and/or storm piping
b. Structured Solutions—Manhole rehabilitation
c. Tri-State—Cleaning,inspection,and CIPP lining
5. Division of Water Infrastructure(DWI)Requirements
a. This project is state funded
b. All documents will include the state funding number (SRP-W-0187) and the WK
Dickson(Engineer)contract number(20210293.00.RA)to aid in tracking.
c. Use Change or Add a Subcontractor form in the contract documents,00 43 01,if need
to change subcontractors. Can send a draft to DWI for preliminary review before
execution.
d. DWI plans to periodically attend progress meetings and complete site visits
throughout the project.
e. DWI requested to be included in progress meeting invitations and the issuance of
meeting minutes.
f. DWI is amenable to assisting with financial disbursement and change order
processing as needed.
i. DWI requested that the change order checklist be included with each submission.
ii. Draft change orders are to be provided to B. Al-Masri for review and comments
before official submission for execution.
g. DWI requested that HG Reynolds provide outstanding DBE forms for review. The
submitted forms are to be sent to the Engineer for review prior to being forwarded to
DWI.
6. Critical Work Items:
a. Traffic Control
i. Coordinate traffic control plans with the City of Henderson(Owner)
b. Emergency Response
i. Maintain a construction crew capable of performing emergency maintenance
work 24/7, including all holidays. At a minimum, provide phone numbers for at
Ieast three individuals in responsible charge, 24/7 phone numbers, and names to
be provided to the Engineer and Owner.
c. NCDOT Encroachment
2

City of Henderson
Sandy Creek Basin Sewer Rehabilitation Find-It Fix-It Project
WK Dickson Project No.20210293.001LA
DWI Project No.SRP-W-0187
i. An encroachment will be applied for and issued once the type of rehabilitation in
NCDOT roads is determined.
d. Working Times
i. Monday through Friday, 7:00 am to 6:00 pm, five business days' notice to exceed
regular working hours.
ii. On NCDOT roads, work hours are anticipated to be between 9:00 am and 4:00
pm.
iii. City of Henderson Holidays — 2024: Good Friday (3/29), Memorial Day (5/27),
Juneteenth (6/19), 41h of July (7/4), Labor Day (9/2), Veterans' Day (11/11),
Thanksgiving (11/28-11/29), Christmas (12/24-12/26), holidays for 2025 and 2026
will be provided closer to the beginning of each year.
e. Resident Notification—Door hangers will be placed on affected properties at least 48
hours before the interruption. The notice will indicate the start and duration of the
interruption, and service interruptions will last no more than eight hours at a time.
f. Pre-construction video — two copies of pre-construction video and/or photos to be
submitted to the Engineer prior to the first pay application; can be of the entire
contract area or portion submitted in first pay application; if only a portion
submitted with first pay application, other areas will need to be submitted before
payment for those areas is approved.
i. Identifying location information (e.g., street names, basin location, manhole
numbers, etc.) is to be included in the submission of pre-construction
videos/photos.
g. Staking and As-Built Survey
i. Per Section C-700 Part 4.03 and Section 31 05 00 Part 3.02 of the contract
documents,the contractor is responsible for all construction staking.
ii. Field verify (pothole) all utility Iocations before excavation, per Section 02 01 20
Part 3.01.E of the contract documents.
iii. The Contractor will provide the coordinate locations (x,y) of the pipe and
elevation and the locations of sewer inverts, manholes, etc., per Section 0133 00,
part 1.04.13.5 of the contract documents.
h. Erosion Control
i. LQS, no permit is necessary due to the nature of the project. Less than one acre of
disturbance is anticipated.
i. Easements
i. All rehabilitation will be done in existing right-of-way or utility easements.
ii. if work is required in an area without a preexisting easement, easement
acquisition will need to be completed prior to initiating work.
iii. The City of Henderson will clear easements as needed if provided adequate notice
by the Contractor.
j. Other Utilities
i. The Contractor is responsible for completing utility locates before initiating
groundbreaking activities.
3

City of Henderson
Sandy Creek Basin Sewer Rehabilitation Find-It Fix-It Project
WK Dickson Project No.20210293.00.RA
DWI Project No.SRP-W-0187
ii. The Contractor will coordinate with the Engineer and utility owner and schedule
a coordination meeting a minimum of seven (7) days before planned service
interruption for gas,electric,cable, and telephone.
k. Cut-in Construction
i. Coordinate service interruptions with the Owner.
ii. Submit a shut-down or service interruption work plan for review and approval by
the Owner and Engineer at least 30 days before the service interruption.
iii. Evaluate the vertical depth of the existing main and any conflicting utilities before
shutdown.
1. Cleanliness
i. Daily clean-up of dirt, debris, scrap, and other items resulting from Contractor
operations.
m. Water Usage
i. Provide monthly readings/usage to the Owner.
1. The Contractor will estimate water usage by recording the quantity of
withdrawals and multiplying by the tank volume.
ii. The Contractor is permitted to draw water from the City of Henderson's Public
Works facility or hydrants if proper backflow protection measures are utilized.
n. Testing
i. Employ and pay for services of an independent firm to perform testing and
inspection as required by Contract documents and specifications through
allowance provided with the contract.
o. Staging Areas
i. The Contractor is responsible for agreements for areas outside of established
easements.
ii. Possible Staging Areas
1. Operations Center parking lot.
2. The old landfill along Route 39.
a. Contractor will review locations proposed by Owner.
p. Customer Service
i. The Contractor is to make every effort to reduce the impact of construction on the
Owner's operation and maintenance of the water and sewer system and affected
customers within the project area.
ii. Complaints/Claims
1. The Contractor is to report any complaints/claims to the Owner and Engineer;
the procedure for reporting/responding is included in Special Conditions.
q. Fencing
i. Several fences may need to be removed and replaced.
1. The Contractor will provide a temporary fence where required and replace it
with a new one when the work in the area of fencing is completed.
2. The Contractor is to coordinate fence removal and replacement of both
temporary and permanent fences with the property owner.
r. Retaining and Landscaping Walls
4

City of Henderson
Sandy Creek Basin Sewer Rehabilitation Find-It Fix-It Project
WK Dickson Project No.20210293.00.RA
DWI Project No.SRP-W-0187
L The Contractor is to replace any wall disturbed during operations.
s. Site Access
i. An agreement is needed if work or access is outside the established right-of-way.
The Contractor is responsible for all costs, including erosion and sediment control
measures and permitting for areas outside right-of-way.
t. Bypass Pumping
i. Submittal must be signed and sealed by a registered NC PE.
ii. Provide a 24-hour bypass system watch.
iii. A coordination meeting before starting the system will be required at least seven
days before the bypass starts. A zero-tolerance policy for spills.
iv. The project takes place in publicly accessible areas, and proper precautions need
to be taken to prevent damage or injury.
u. Site Restoration
i. The final site condition after construction is to be as good or better than the
condition before construction.
v. Monthly Progress Meetings
i. Monthly progress meetings will be held at the Operations Center and/or online
via teams and are intended to last about an hour.
ii. Meetings will be scheduled for the second Wednesday of each month at 10:00 am.
The first monthly progress meeting is scheduled for 6/12/2024.
w. Project Schedules
i. The preliminary project schedule will be submitted before the first pay
application will be processed.
ii. Submit updated schedules every 3-4 months with pay apps when delays occur.
iii. Also update each week for the upcoming week if needed.
x. The Contractor will contact the Owner and the Engineer/Construction Observer the
day before if the schedule changes for the following day.
y. Rain Delay Recordation
i. Rain delays are to be tracked and recorded by the Contractor and submitted to the
Engineer every month.
z. Weigh/Quantity Tickets-required for Contract quantities not measured in place
i. Requires Owner's approval before beginning.
ii. Submit weight/quantity tickets to Owner.
iii. See Section 2.07.G of Special Conditions for ticket requirements and other details.
7. Submittals/Shop Drawings/Project Documentation
a. Provide a preliminary schedule of submittals to the Engineer.
b. All submittals and shop drawings are to be submitted to the Engineer.
c. In accordance with Contract Documents
i. Specification 0133 00,Submittals
d. One (1) electronic (pdf) copy shall be submitted. The Engineer will return an
electronic(pdf) copy.
5

City of Henderson
Sandy Creek Basin Sewer Rehabilitation Find-it Fix-it Project
WK Dickson Project No.20210293.00.RA
DWI Project No.SRP-W-0187
e. All electronic submittals and project documentation will be uploaded and processed
through the Newforma project portal.
8. Designation of Responsible Personnel:
a. City of Henderson
i. Project Manager and Director/ORC KLRWS&HWRF-Christy Lipscomb
Phone:[phone](call&text)
Email: [e-mail]
ii. Inspector-Dale Jones
Phone:[phone]
Email: [e-mail]
b. Engineer
i. Project Manager-Anita Robertson
Phone:[phone] (text)
Email: [e-mail]
ii. Project Engineer-Mac Perro
Phone:[phone](text)
Email: mperroowkdickson.com
iii. Construction Observer-Christa Austin
Phone:[phone](call)
Email: [e-mail]
c. Contractor
i. Project Manager-Matthew Beasley
Phone:[phone](call&text)
Email: MBeasleykhgreynolds.net
ii. On-Site Superintendent-Lucas Beasley
Phone:[phone](call&text)
Email: Easley-ghgreynolds.net
iii. Superintendent for Digging-Profilio Reyes
Phone:[phone](call&text)
iv. 24-Hour Number-Woody Griffin(919)215-3083
d. DWI
i. Inspector-Bashar Al-Masri
Phone:[phone] office
Email: [e-mail]
9. Change Orders
a. Any changes to the contract will need to have a change order negotiated and agreed
to. DWI will approve all change orders in a separate process for disbursement.
10. Pay Applications
6

City of Henderson
Sandy Creek Basin Sewer Rehabilitation Find-it Fix-It Project
WK Dickson Project No.20210293.00.RA
DWI Project No.SRP-W-0187
a. Before submitting pay applications, the Contractor, Engineer/Construction Observer,
and Owner will review and agree on all items and quantities the Contractor requests
for payment and deem them applicable.
b. Applications are to be based on work completed as of the last day of the month.
c. Pay applications shall contain a certificate documenting any sales tax paid by the
Contractor for that billing period.The certified form is required even if no sales tax is
paid during that pay request period.
d. The Contractor may submit draft pay applications to the Engineer prior to
submitting official pay application. The Engineer to review and provide comments
on draft pay application within five business days from receipt, with final review
and submission to Owner no later than 5 days after receipt. Draft pay applications
should be submitted via email using Excel for ease of review.
e. ShouId contain a cover sheet similar to the EJCDC C-620 Form.
f. Official pay application will be submitted electronically and include copies of all
invoices claimed on the sales tax certificate.
11. Other Comments and Questions
a. The Contractor has expressed concerns regarding the existence of cleanouts
throughout the project corridor. If cleanouts are not present, it may lead to sewer
backups in homes in areas where cleaning and lining activities are ongoing.
i. If cleanouts are absent, the Contractor is to install cleanouts once approved by the
Engineer before completing any cleaning or lining activities. This work will be
allocated under Items 78 and 79 of the revised project Bid Form.
b. Do we need the builder's risk policy?The Owner is reviewing this question and will
coordinate with the Engineer to provide an answer to the Contractor as soon as
possible.
c. The Newforma project portal will be used to file, store, and manage project
documentation.
d. DWI no Ionger processes disbursement application requests through email requests.
Instead, disbursement application requests must be sent through the DWI portal
(accessible through the DWI website) for processing.
12. Action Items:
a. The Engineer is to provide available sewer shapefile information to the Contractor.
b. The Engineer will setup the Newforma project portal and provide credentials to all
parties.
c. The Contractor is to submit a schedule of submittals and begin submitting project
shop drawings and submittals to the engineer for review.
d. The Owner is to answer whether a builder's risk policy is required.
7

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MBEIWBE DBE - Change or Add a Subcontractor Form
According to EPA guidance on 40 CFR 33.302
If a DOE subcontractor fails to complete work under the subcontract for any reason, the recipient must
require the prime contractor to employ the six good faith efforts described in§33.301 if soliciting a
replacement subcontractor.
Please provide the information below if the subcontracted work in question was included in previously
submitted good faith efforts documentation:
Prime Contractor: H.G. Reynolds Company, Inc.
Subcontracted work:
Previous Subcontractor:
Reason this firm did not complete the work:
New subcontractor and DBE status: ❑MBE ❑WBE []N/A
If this is a new trade being subcontracted,or was not documented in the original Project Bid Information
submittal to the State then good faith efforts to solicit a DBE firm must be documented. As the original
DBE instructions indicate, please provide a Table B from those original instructions,showing all the DBE
firms contacted to perform this work. If three (3)firms are not listed on Table B,then additionally you
must submit proof of an advertisement in a minority trade paper and evidence that there were not
three reasonably available firms in the work area.The EPA provides in 33.301(a) that good faith efforts
are to be carried out "...to the fullest extent practicable...". If solicitations were not carried out due to
being impracticable, please attach this explanation to this form.
Please follow the steps below for new subcontracted work:
Indicate the new trade being subcontracted:
Indicate the firm being used and DBE status: ❑MBE ❑WBE ❑N/A
Attach Table B
(For State Use) is this sub debarred? ❑Yes ❑No — -�
City of Henderson SRP-W-0187
Project Owner/Applicant: Project Number:
Signature of Prime Contractor's Representative

Division of Water Infrastructure
Change Order Checklist
To be considered for eligibility, the following information must be submitted for an eligibility
determination (approval). The Division will send a letter indicating what costs are eligible for
funding to the project owner and engineer.
Owner: City of Henderson
Project Name: Sandy Creek Basin Sewer Rehabilitation Find-It, Fix-It
Funding Project No.: SRP-W-0187
Change Order No.:
Contract No.:
Contractor Name: H.G. Reynolds Company, Inc.
CHANGE ORDER DOCUMENTATION:
A copy, scan or original of one properly executed change order with Owner's and Contractor's
signatures including each si nato s printed name and title is required. An unexecuted copy
may be submitted for a preliminary eligibility determination. All supporting documentation
must be provided including the following, as applicable:
❑ Federal and/or State Project number(s) shown on the change order.
❑ Clear description of each change.
❑ Detailed justification to identify the need for each change.
❑ Summary and cost documentation which may include:
• Unit price cost,
• Lump sum for item or task,
• Contractors cost breakdown,
• Equipment invoices, and
• Engineer's independent cost estimate, as applicable based on complexity of
change order.
❑ Copy of the new, revised or noted, highlighted and/or red-lined contract drawings
and/or specifications showing and describing the change.

DocuSign Envelope ID:B3ED6A46-OB02-4693-9BD1-262875EC)DFOF
ATTACHMENT B.
Ploy COOPER
Governor
ELIZABETH S.BISER `ma +d�
Secretary
RICHARD E.ROGERS.JR. NORTH CAROLINA
Director EnWmnnwmal Quality
March 15, 2024
Mr.Terrell Blackmon, City Manager
City of Henderson
PO Box 1434
Henderson, NC 27536
Subject: Henderson Wastewater Collection System
Collection System Permit: WQCS00055
Wet Weather Sanitary Sewer Overflows
Vance County
Dear Mr. Blackmon,
The NC Department of Environmental Quality - Division of Water Resources (DWR), Raleigh
Regional Office (RRO) recently conducted a review of the City of Henderson's sanitary sewer
overflow (SSO) reporting records for January 2022 to January 2024 (25 months). The file review
identified 49 reported SSO totaling more than 1 million gallons of wastewater released from the
collection system. Eighty-six (86) percent of the total reported SSO causes were due to
inflow/infiltration or severe natural conditions and more than 39 percent were associated with
Rock Mill Road and the Sandy Creek interceptor and pump station.
On Friday, March 1, 2024, Donald Smith, and Danny Smith from the RRO met with city staff,
Christy Lipscomb —Water Resources Director, Joey Long—Assistant Water/Sewer Director/ORC,
and Seth Davidson —Water Reclamation Facility Maintenance Supervisor. Following the meeting
to discuss the SSOs and system operations, the Sandy Creek Pump Station and a few manholes
associated with two parallel 12-inch gravity sewer lines were visited.
City staff provided the following information during the meeting:
Collection System: The Henderson wastewater collection system consists of 163 miles of
pipeline with 147 miles of gravity sewer and 15 miles of force main. There are 13 duplex
pump stations. The city has a population of approximately 14,900 residents. City staff
identified the Sandy Creek Sewer Basin to be an area of the system that backs-up and has
capacity issues during heavy rainfall events. Likewise, the wastewater treatment plant
also experiences high flow conditions(10-13 MGD), more than 10 times the average daily
flow of 1.6 million gallons per day (MGD) during heavy rainfall events. The collection
North Carolina Depanment of Environmental Quality I Division of Water Resources
ro!-O:�D_E Q Raleigh Regional Office 1 3800 Barrett Drive I Raleigh,North Carolina 27609
�\ �,/ 919.791.4200

DocuSign Envelope ID:B3ED6A46-0B02-4693-9BD1-262875EDDFOF
City of Henderson,WQCS00055
March 15,2024 Page 2 of 4
system consists of a variety of different pipeline materials including PVC,vitreous clay and
cast-iron pipe. Manholes are constructed in a variety of pre-cast, brick and mortar
designs.
SSO and Inflow and Infiltration (1&1) Reduction Efforts: The city has worked with WK
Dickson, a consulting firm in 2021 and 2022 to acquire a total of $7.5 million of state
revolving funds and grants to work on I&I reduction. City staff conducted some in-house
flow monitoring and smoke testing around the same time-period to identify sources of
I&I. Some I&I and stormwater system connections were found and corrected. The city
has a project kickoff meeting scheduled for March 22, 2024, with HG Reynolds, a
contractor to assist with finding and fixing I&i problems in the collection system. It was
also explained by the city staff, that the contractor will especially help in areas of the
system that are difficult to access due to wet easement conditions.
Sandy Creek Basin and Pump Station Visit:City staff indicated that the Sandy Creek Pump
Station has a current average daily flow of 0.5 MGD with a firm capacity of approximately
4 MGD. The pump station is a wet pit/dry pit design consisting of a bar screen, wet well,
(2) variable frequency drive - 300 Hp horizontal split case centrifugal pumps, weight
assisted check valves, magnetic flow meter,force main emergency bypass connection, 16-
inch force main, and approximately 8 to 10 air release valves (ARV). The Sandy Creek
Pump Station receives sewer flow from three upstream pump stations (Industrial Park,
HV2, and Martin's Creek). The pump station has programmable logic control (PLC) and
supervisory control and data acquisition (SCADA) telemetry and is monitored by
wastewater treatment plant personnel.
In 2018 Charles Underwood (contractor)performed maintenance at the pump station that
included conducting a drawdown, flushed the force main, and repaired/replaced 8-10
ARV. Staff indicated that no additional pump drawdowns or ARV maintenance has
occurred since Charles Underwood's maintenance.
While onsite city staff placed pump #1 in hand and operated the pump at 55 hertz (92%
speed) with an observed flow rate of approximately 1,730 gallons per minute (GPM), or
2.49 MGD. City staff explained that the pump controls are adjusted to 55 of 60 hertz due
to vibration at 100% speed. City staff also indicated that only one pump is operated at a
time as when two pumps are used, they "fight" each other's discharge and a lower
discharge rate is observed. The Sandy Creek Pump Station is listed in the collection system
permit as having a capacity of 2,750 GPM or 3.96 MGD.
E Q Nonh Carolina Department of Environmental Quality I Division of Water Resources
Raleigh Regional Office 1 3800 Barrett Drive I Raleigh,North Carolina 27609
�%%.r 919 791 4200

DocuSign Envelope ID:B3ED6A46-OB02-4693-9BD1-262875EDDFOF
City of Henderson, WQCS00055
March 15, 2024 Page 3 of 4
GreenAcres Gravity Sewer(parallel 12-inch sewer lines with crossover):
Parallel 12-inch gravity sewer line identified as "Green
Acres" was visited and manholes opened to observe
system flow and manhole conditions. At the time of the
inspection, one of the 12-inch sewer lines appeared to
be flowing at approximately 50-60%full while the other
sewer line was flowing in the 30-40% full in junction
manhole where flows combine. There was no
measurable rainfall the day prior to the system '
inspection. (Note: These observations occurred prior to
the late afternoon/evening precipitation event for
March 1.) The parallel 12-inch sewer lines combine with
an estimated 18-inch sewer line that expands to 24-inch
as it flows to the Sandy Creek Pump Station. The
manholes were brick and mortar construction and the
sewer lines appeared to be vitreous clay pipe that GreenAcres-GravitySewerjunction Manhole
transitions to ductile iron pipe in the area visited.
In response to the site visit and this letter,the RRO requests a follow up meeting with the City of
Henderson and appropriate engineering and city staff in June 2024 to discuss how the city plans
to address the wet weather Sandy Creek SSO issues. Prior to the follow up meeting, please
provide this office by May 31, 2024, with a letter from the city engineer/management with
updates on items 1-4 listed below, and any additional information you wish to provide:
1) Summary of data collection and assessment (flow monitoring, rainfall, smoke testing, sewer
line assessment,other)efforts used to identify I&I and system capacity in areas of the Sandy Creek
Sewer Shed and any other areas affected by wet weather SSOs.
2) Hydraulic capacity and condition assessment of the Sandy Creek Pump Station. This
assessment/account should include information on pump drawdowns,vibration assessment,and
results of force main/ARV evaluation(s).
3) Please describe any additional or new monitoring efforts that are planned to help
systematically identify hydraulic pinch points and I&I sources that could account for WWTP
hydraulic loading.
4) Also, provide a proposed plan and schedule for how acquired funding will be used to remedy
and address rehabilitation/repair/construction needs to abate sewer overflows.
D North Carolina Department of Environmcnial Quality I Division of Water Resources
Raleigh Regional Office 1 3g00 Barren Drive I Raleigh,North Carolina 276M
4;m_�t 4 919,791 4200

DocuSign Envelope ID:B3ED6A46-OB02-4693-9BD1-262875EDDFOF
City of Henderson,WQCS00055
March 15, 2024 Page 4 of 4
Please respond by e-mail to Donald Smith at [e-mail] confirming city staff
availability for a follow up meeting on Wednesday,June S at 10:00 a.m. (If this proposed meeting
does not work for Henderson, please offer an alternative date and time with your e-mail
response.
Thank you for your attention to these matters. If you have any questions, please do not hesitate
to contact Donald Smith [phone] or me at [phone].
Sincerely,
�vooeusgird ar:
ak t ss ' ,
132918E&&e321"F...
Vanessa Manuel, Assistant Regional Supervisor
Water Quality Regional Operations Section
Raleigh Regional Office
Division of Water Resources, NCDEQ
Cc: Laserfiche
D North Carolina Department of Enviro�rnental Quality I Division of Water Resources
Raleigh Regional Office 13800 Barrett Drive I Raleigh,North Carolina 27609
919.791 4200

ATTACHMENT C.
Ha"nTechnical Memorandum
T
June 12,2024
To: Christy Lipscomb,City of Henderson
Seth Davidson,City of Henderson
From: Brandon Garner, Hazen and Sawyer
Jared Hostetler,Hazen and Sawyer
Seraphim Falterman,Hazen and Sawyer
Maria Isabel Alexander Rodriguez,Hazen and Sawyer
Sandy Creek Pump Station Evaluation
DRAFT
The Sandy Creek Pump Station(PS)has a history of sanitary sewer overflows (SSOs). Significant
operational challenges exist at the PS that prevent it from meeting minimum performance requirements.
Major repairs or total replacement of the PS are likely necessary to prevent future SSOs
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Hazen and Sawyer•4011 WestChase Boulevard,Suite 500•Raleigh,NC 27607•919.833.7152

Hazen June 12,2024
Table of Contents
1. Assessment Location & Project Context...................................................................3
2. Location Asset Inventory...........................................................................................3
3. Condition and Criticality Assessment........................................................................4
3.1 Site and Building Condition Rating.............................................................................................4
3.2 Electrical Room Condition Rating...............................................................................................7
3.3 Pumps and Piping Condition Rating...........................................................................................8
3.3.1 Pump No. 1..................................................................................................................10
3.3.2 Pump No.2..................................................................................................................11
3.3.3 Sump Pump.................................................................................................................11
3.4 Wet well Condition Rating. .......................................................................................................12
3.6 Mechanical Screen and Screenings Washer/Compactor Condition Rating.............................13
3.6 Overall Pump Station Condition Rating: 5................................................................................13
4. Rehabilitation and Replacement.............................................................................14
4.1 Note on Existing Assets............................................................................................................14
4.2 Short Timeline Opportunities for Improvement.........................................................................14
4.3 Longer Timeline Opportunities for Improvement......................................................................14
5. O&M Program Assessment .................................................................................... 15
6. R&R Cost Estimate................................................................................................. 15
Page 2 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
1. Assessment Location & Project Context
The City of Henderson owns and operates 13 wastewater pumps stations in Vance County including the
Sandy Creek Pump Station(PS). Hazen and Sawyer conducted a site visit to carry out the PS evaluation
and pump assessment field testing on April 23,2024.
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The Sandy Creek PS receives flow from gravity sewer lines within the Sandy Creek basin as well as
pumped flow from the Industrial Park PS,HV2 PS,and Martin Creek PS.The Sandy Creek PS is
comprised of two(2)Cornell 8NHTA pumps. Additionally,the PS is equipped with a mechanical bar
screen and screenings press furnished by Vulcan,as well as a bypass channel with a manual bar screen.
2. Location Asset Inventory
Line item assets included in this assessment consist of the following:
• Building
• Electrical Room
• Pumps and Piping
• Wet well
• Bar Screens,Rake,and Conveyor
Page 3 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
3. Condition and Criticality Assessment
Condition Rating is scored on a scale from 1 to 5, with 1 being assigned to new equipment and 5 being
assigned to equipment that need immediate replacement.Detailed criteria are shown in Table 3-1.
Table 3-1:Scoring criteria for equipment evaluation.
Condition Score Criteria
1 A score of 1 is given to any new equipment _
2 A score of 2 would represent a piece of equipment that is within its expected useful life and
is in and workin condition with onl minor cosmetic defects
3 A score of 3 Is given to equipment that is near the end of its expected useful life but is still in
working condition and has some cosmetic defects
A score of 4 indicates that the equipment has surpassed its expected useful life,may need
4 minor repairs and may have large cosmetic flaws.A piece of equipment that scores a 4
should be considered for repair or replacement In the near future
5 A score of 5 is given to equipment that needs immediate replacement
(typically not working)
3.1 Site and Building Condition Rating
The Sandy Creek PS building has two(2)sections,the newer Electrical Room(see next section for
details)and the Pump Room above the wet well,which is older.The site has sufficient parking.The
access to the drive is controlled with a metal cable and a padlock. Access to the PS itself is controlled
with a fence,padlock,and gate.Cameras are not used at this site.
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Page 4 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
The drive is sometimes used as an access point for Roland Pond(just upstream of the PS on Sandy
Creek).The site is used for fishing access and parking of vehicles.The site is not suitable for the general
public and vehicles left at the pump station parking can cause access problems for maintenance staff.
• A major issue for the structure at Sandy Creek PS is the intense vibration experienced when
running both pumps together or a single pump at speeds in excess of 55 Hz'. It has been reported
that vibration has been so severe as to shatter fluorescent lighting.As such, speeds in excess of
55 Hz are locked out within the variable frequency drive(VFD)programming for both pumps,
and only a single pump is brought online at a given time.
This level of vibration is severe. A structural vibration evaluation is recommended to
evaluate the long-term effects of the vibration on the building. If new pumps are
purchased for this PS, it is recommended that potential vibration issues are evaluated by a
structural engineer due to the severity of the current issues.
• Air quality metering and alarming is recommended.
There is only one vent to the wet well. The ductwork is damaged to the point it cannot
contain airflow,and the fan is not working.
' An Extech Instruments Heavy Duty Vibration Meter(407860)was used for vibration testing.This meter is
rated to measure vibration velocities up to 7.87 in/sec.Hazen observed vibration velocity readings higher than this
rating.
Page 5 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2624
• Access to the lower gallery level(dry pit) of the PS is via a steep set of ship stairs.This stair is
narrow enough that only one person can use it at a time and steep enough that individuals could
have difficulty exiting in an emergency.
The tight access point and ventilation problems make this confined space a safety
concern.
r•
• The floor grates are not secured in place.
►ct,
• Openings more than 2'x 2' need to be covered.
• Monorail crane last inspection was in 2019, load test stamp not visible.
• There is minor damage along the edge of the concrete pad
Page 6 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
• Cracking observed in the lower gallery level of the PS
• Sump pump covers need to be replaced
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3.2 Electrical Room Condition Rating
The electrical room is a more recent CMU addition to the Sandy Creek PS. The cleanliness in the
electrical room,electrical equipment, and enclosures was excellent. The generator and automatic transfer
switch(ATS)are functional and there is adequate clearance in front of panels and around equipment.
Routine maintenance is performed of the ATS annually. While no regular maintenance plan currently
exists for the VFDs,one is currently being developed.
There has been a history of power loss and communication failure between the PLCs at the PS
and the WWTP.During these events,the PS does not operate,sometimes resulting in SSOs. To
troubleshoot this problem,a watchdog timer has been installed.While this solution has helped
City personnel keep the PS running,it is recommended that a more robust solution be found due
to the importance of maintained SCADA communications for proper system operations.
Page 7 of 15
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
3.3 Pumps and Piping Condition Rating
The Sandy Creek PS is equipped with two(2)vertical extended shaft solids handling pumps and a sump
pump.The solids handling pumps(Pumps No. 1 and 2)are Model 8NHTA pumps furnished by Cornell
with 17.5-inch impellers. Both pumps have a rated design point of 2,750 gpm at 230 feet of head
(operating at 57.6 Hz)and a factory best efficiency point of 82%at 3,752 gpm and 219 feet of head
(operating at 60 Hz).Field testing was carried out to compare current pump operation with original
factory information.A visual inspection,but no field testing,was conducted for the sump pump.
t
The Sandy Creek PS has experienced recurring SSOs indicating that influent flows regularly exceed the
capacity of the PS.While confirming the cause of SSOs was beyond the scope of the PS evaluation,
several possibilities were identified:
The upstream sewer experiences flows that exceed the discharge capacity of the pump station. To
compensate for this,the wet well is operated at levels higher than was the original design intent.
The water surface elevation increases to the point that the upstream sewer is surcharged.During
high flow events, surcharging the upstream sewer is a non-engineered solution to the PS's
capacity issues.
This method of operation has high risk for SSOs and may cause problems in upstream
sewers. Upstream sewers are designed to drain freely,but when the pipes are partially
flooded the water surface can block the flow of fats,oils,and grease(FOG).FOG can
Page 8 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
then form deposits that encourage other objects to become stuck as well.This can lead to
a cycle where blockages build up until high flows wash them away.
• The pumps at Sandy Creek PS have operational issues. The operational problems reported by
maintenance staff and observed during the site visit are severe.
Intense vibration was observed in both pumps during the site visit.City staff indicated
that when both pumps are operated at once,there are also vibration issues and potential
hydraulic limitations due to the increased head associated with the increase in flow.
These limitations prevent any significant increase in PS capacity by running two(2)
pumps at once.
Maintenance staff report that operating pumps at 60 Hz has caused vibrations that shake
the building enough to shatter fluorescent lamps. Significant vibration was identified in
both pumps during vibration analysis.The direction of the most severe vibrations of
Pump No. 1 is horizontal (perpendicular to the shaft)and of Pump No.2 is vertical
(parallel to the shaft).
Both pumps have unexpectedly become blocked by large objects that were not removed
by the screens,probably entering the wet well via the bypass channel. Pump No. 1 was
previously rendered out of service and repaired on site.The impeller of Pump No.2 was
damaged to the degree that it needed to be rebuilt offsite. Impeller damage may also
contribute to decreased performance and the hydraulic issues observed when operating
both pumps at once.
The vibration issues in this pump station may be caused by misalignment that occurs
when objects collide with pump impellers.. When the impeller is struck,the force of the
blow may be transferred up into the impeller shaft outside of the pump and into the
coupling with the motor. Repeated collisions could cause misalignments or other issues
in equipment from the impeller to impeller-drive shaft coupling, and even into he motor
itself.
• The downstream force main does not appear to be undersized according to its design and should
have reasonable capacity.However,calculations prepared before the site visit indicate that a flow
of 2,750 gpm should be expected at a head of 238 feet, but a flowrate of only 1,700 gpm was
observed.
This lower flowrate at a know pressure head indicates that there is an unaccounted for
source of headloss in the force main.An evaluation of the force main is recommended to
investigate further. Potential causes include fat, oil and grease(FOG)deposits,air
accumulation at high points,and solids accumulation at low points.
Page 9 of 16
Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
3.3.1 Pump No.1
Throughout the field testing of Pump No. 1,observed performance was well below the design point and
the factory curve.The pump did not operate in the preferred operating range(POR)during testing.
Figure 3-1 shows the factory and field observed performance curves for Pump No. 1. The pump cannot be
operated at full speed and cannot achieve the design flowrate.
Pump 1 Performance Curves
380 - 100.0%
360 11 ITT
320 90.0%
288 80.0%
26a 70.0%
LL 2220Q 60.0%
166 50.0%
140 40.0%
10
100 30.0%
80
60 20.0%
40
20 10.0%
0 0.0%
0 5o0 1,000 1,500 2,000 2,500 3.000 3.500 4,000 4,500 5,000 5,500
FLOW(GPM)
• POR Factory Pump Curve Field Test Curve Factory Efficiency Field Efficiency
Figure 3-1: Factory and Field curves for pump 1
Possible explanations for the poor performance of Pump No. 1 include:
• Wear/damage caused by vibrations
• Volute/impeller damage caused by debris
• Downstream force main obstruction
• Wear due to excessive starts/stops per hour
For Pump No. 1,a vibration analysis was performed on both the upper bearings at the motor and the
lower bearings at the pump. This was necessary due to the long shaft and coupling used at this PS.
Vibration analysis was performed at 4 speeds between 55 Hz and 42 Hz.Typical procedure would be to
include an analysis point at 60 Hz,but this point was not tested due to reports of excessive and dangerous
vibration at that speed and observed vibrations at 55 Hz.
Motor top bearing and bottom bearing in the lower level were tested. Motor top bearings experienced
smaller vibrations than the lower level. A significant and concerning increase in the horizontal vibration
of the lower bearings was observed when increasing the pump speed from 50.8 Hz to 55 Hz.
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Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
3.3.2 Pump No.2
Throughout the field testing of Pump No. 2,observed performance was well below the design point and
the factory curve.This pump had been rebuilt after experiencing significant damage to the impeller by an
object that bypassed the screens. Significant vibration in the vertical direction was observed in Pump No.
2 at speeds above 45.08 Hz(1,337 rpm).
The vibration issues of Pump No. 2 are most severe in the lower bearings.Vibration is
more pronounced and is apparent at lower speeds than that of Pump No. 1.The vibration
observed during the testing of Pump No.2 was primarily in the vertical direction.
Figure 3-2 shows this loss of efficiency in the difference between the Factory Pump Curve and the Field
Test Curve. The pump does not operate in POR during testing.
Pump 2 Performance Curves
380 - - HII 100.0%
IIIF
340
90.0%
320 80.0%
300
260 J L 70.0%
240 60-0%
LL220
200
180 50.0%
s 1 40 0%
140 40
120 30.0%
100
60 20.0%
40 10.0%
20
0 0.0%
0 500 1,000 1,500 2,000 2,500 3,000 3500 4,000 4,500 5.000 5,500
FLOW(GPM)
6 POR tFactory Pump Curve Field Test Curve Factory Eflclency -+e-Flold Eflkkney
Figure 3-2 Factory and Field curves shown relative to the preferred operating region(POR)for pump 2
3.3.3 Sump Pump
The sump pump was visually inspected only and not field tested.The wet well cover does not cover the
opening in the floor, is not in good condition,and is a safety hazard. Sump pump and sump well cover are
in need of repairlreplacement.
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Sandy Creek Pump Station Evaluation
DRAFT

Hazen June 12,2024
3.4 Wet Well Condition Rating
The wet well has a working volume of approximately 5,500 gallons and is marginally undersized for the
design firm capacity of 2,750 gpm(corresponding to a design drawdown time of 2 minutes).Note that
each pump is currently limited to an approximate discharge capacity of 1,700 gpm.
• The sumps on each side of the wet well are longer and wider than they are required to be.
Commonly,these sumps are just large enough to house the pump inlet or suction piping,and
adjacent concrete fill is benched to direct solids to the inlet.The existing configuration results in
an area of potential grit accumulation. Solid material was observed within the suction piping
when installing suction gauges during the pump testing,suggesting that grit accumulation is
occurring. This may contribute to unfavorable suction conditions,potentially reducing the
capacity of each pump and/or contributing to vibration.It is recommended that a vacuum truck be
used periodically to remove settled solids from each sump. If this is not feasible,a retrofit of the
wet well may be required.
• Available data suggests that the wet well is routinely drawn down below the recommendations
outlined in HI 9.8.6.3 (in this instance, 37 inches above the inlet bell elevation).The PLC
programming may be adjusted to ensure that sufficient suction head is provided within the wet
well.
• Moreover,the inlet bell elevation is marginally higher than the recommendations outlined in HI
9.8(approximately 12 inches instead of 7-11 inches).This could be compensated for by adding a
few inches of concrete fill to the bottom of each sump,in addition to any sloped benching as
described above.
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Sandy Creek Pump Station Evaluation
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Hazen June 12,2024
3.5 Mechanical Screen and Screenings Washer/Compactor Condition Rating
This equipment is in good working order,but the instrumentation has lost some functionality. The
ultrasonic level sensor in the screen channel does not control the screen. Instead,screen operation is based
on a timer. Additionally,there is a drain underneath the dumpster that is intended to drain this area of
pavement into the wet well.This is a spill point where SSOs occur when the wet well level rises
sufficiently or is overtopped.
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• It is recommended that an ultrasonic level sensor be used as part of the screen control,calling the
screen to run when the upstream level rises to a programmed setpoint.Incorporating this logic to
increase the cycle frequency would help debris be removed more effectively.This would help
mitigate the risk of pump damage or downstream force main blockages.
3.6 Overall Pump Station Condition Rating: 5
The Sandy Creek Pump Station(PS)has a history of sanitary sewer overflows(SSOs). Significant
operational challenges exist at the PS that prevent it from meeting minimum performance requirements.
Major repairs or total replacement is necessary for this pump station to operate without SSOs.
The Condition Rating for the Sandy Creek Pump Station is 5,based on the following:
• The pumps experience unsafe levels of vibration when operated at speeds in excess of 55 Hz,and
a detailed structural evaluation of the building is recommended.
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• The pumps are unable to achieve the design capacity individually and cannot be operated together
due to vibration and hydraulic limitations,resulting in an effective station firm capacity of
approximately 1,700 gpm.
• Overall,the PS is unable to handle regularly experienced high flow events,causing SSOs.
4. Rehabilitation and Replacement
The PS consists of a screening system,wet well,two(2)existing solid handling pumps,electrical room
and equipment,and pump room.A rehabilitation project of the PS would need to address the following
issues at a minimum:
• Pump vibration issues
• Pumping capacity issues
• Confirmation that vibrations have not affected the structure of the building and that the bridge
crane is still safe to operate
4.1 Note on Existing Assets
The electrical room and electrical equipment are in excellent condition.This is particularly advantageous
with the current scarcity of available electrical equipment and long lead times. Even if construction of a
new pump station is pursued,the existing electrical equipment may be able to be repurposed to reduce
costs and simplify procurement.
4.2 Short Timeline Opportunities for Improvement
The simplest improvements to the PS involve upgrades to the Instrumentation and Control systems.
• Implementation of a level sensor in the channel upstream of the bar screen would allow for an
automatic change from timer-based operation to more frequent operation of the screen rake.This
would improve the removal efficiency.
• Exploration of more robust options for SCADA power supply maintenance than the existing
watchdog timer system.
• Installation of a remote adjustable camera would allow staff to check the site for SSOs as well as
increase security at the site.
4.3 Longer Timeline Opportunities for Improvement
Longer-term opportunities for improvement hinge upon the results of a structural analysis of the PS
building. If the existing pumps have exposed the building to damaging amounts of vibration,exploration
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of other rehab options need not be considered,and investigation of new pump station construction should
be begun.
• Structural Evaluation of PS building
• Selection of new pumps and pre-installation vibration analysis
• Pump replacement construction phase
• Wet well Computational Fluid Dynamics(CFD)analysis
• Wet well improvements,construction phase
• Upstream and Downstream conveyance system analysis
5. O&M Program Assessment
The O&M program with respect to the electrical equipment is in good order and is in the process of being
further developed and improved. Issues that exist within the O&M program are as follows:
• Structural analysis should confirm that the structure and bridge crane are still safe to operate
• Air quality metering and alarming recommended
• Access to lower level is steep,making exit/evacuation more difficult in an emergency
• Lights have limited access for relamping
• Sump pump cover needs to be replaced
6. R&R Cost Estimate
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Page 16 of 16
Sandy Creek Pump Station Evaluation
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