WQ0003035_Annual Report_20220829

Sewer Collection System Annual Performance Report
City of Eden, North Carolina
July 1, 2021 to June 30, 2022
I. General Information
Facility/System Name: City of Eden, Sewer Collection and Treatment System
Responsible Entity: City of Eden, Jon Mendenhall, City Manager
Person in Charge/Contact: Collection System and Pump Stations, Mike T. Vernon
Operator -in -Responsible Charge, 336-791-3145
Mebane Bridge Wastewater Treatment Plant, Chris Powell
Operator -in -Responsible Charge, 336-627-1009
New Street Wastewater Treatment Plant, Ron Wright
Operator -in -Responsible Charge, 336-627-1009
Applicable Permits: Sewer Collection System — WQCS00018
Mebane Bridge Wastewater Treatment Plant — NPDES Permit NC0025071
Land Application of Wastewater Residuals — NC Permit WQ0003035
New Street Wastewater Treatment Plant — NPDES Permit NC0001643
Description of Collection and Treatment Process:
The collection system consists of 161+ miles of gravity and 19.4 miles of force main sewer
pipelines. The pipelines are composed of a mixture of clay, PVC, RCP, steel and ductile iron pipe, ranging
in size from 6 to 36 inches. Age of the sewer pipelines range from new to more than 60 years old.
Collection is accomplished by gravity from homes and businesses until it is necessary to pump from low
elevations in force main sewer lines that transport the sewage to the treatment plant. There are 20 pump
stations in the collection system. These range in size from pumping a few thousand gallons per day to
more than five million gallons a day (MGD). The City has one primary collection drainage area. All of the
city sewer drains, collects, or is pumped to the Mebane Bridge Wastewater Treatment Plant (MBWWTP),
which can treat 13.5 MGD.
The MBWWTP has treated on average about 2.867 MGD this past year. This is a decrease from
last year because of Mohawk Industries closing the Karastan division. Currently, the Mebane Bridge plant
is operating at one quarter of its capacity. The plant has mechanical barscreens to remove larger inert
material, a grit removal system following the bar screens, and a fine screen after the grit removal system to
further remove any material that is missed by prior treatment systems. Extended aeration using activated
sludge is the next process to reduce and remove biochemical oxygen demand and ammonia. The sludge
is separated from treated water by circular clarifiers. Collected sludge or biosolids are wasted to a CleanB
treatment system or returned to the aeration system. The biosolids from the CleanB are then dewatered
and land applied on permitted sites. Treated water to the effluent leaves the clarifiers and is disinfected
with chlorine and then dechlodnated.We are currently in a trial using Peracetic Acid as a replacement for
disinfection. The treated effluent is then returned to the Dan River meeting all State Permit Discharge
requirements.
The New Street WWTP was purchased in July 2020, and we officially began managing it in August
2020. It only receives a small flow from a local industry, so most months have no discharge. We only had
one month of discharge during this period. The average flow was 0.045 MGD.
II. Maintenance
Annual Performance Report
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Collection System
The City of Eden is presently under an administrative order on consent reissued by the
Environmental Protection Agency to eliminate sanitary sewer overflows that continue to occur from its
sewer collection system. We have received a Modification to the Administative Order of Consent until
December 31, 2024 to complete all improvements.
The City has Collection & Distribution (C&D) field personnel to respond to emergencies in order to
maintain the sewer collection system. Their job is to repair broken lines, installation of new sewer line, mow
and maintain sewer outfall lines, and respond to, rectify and mitigate sewer bypasses. Personnel are on
call nights and weekends year round to respond to emergency problems in the collection system. The
City's 20 pump stations are monitored by 2 C&D Operators 24 hours per day, 7 days per week, by remote
telemetry (Mission Communications) and physically checked on normal workdays by C&D personnel for
proper operation. Maintenance crews along with C&D personnel perform scheduled preventative
maintenance on each of these pump stations to protect the equipment and insure long life. An extensive
warehouse of supplies and parts are maintained to address emergency breakdowns and failures in the
pump stations and the sewer lines.
The following was accomplished during fiscal year 2021-2022:
A total of 2 Inflow & Infiltration (W) problems were responded to and repaired. (Many more were
repaired by contractors)
A total of 5 laterals and 15 sewer mains were responded to and unstopped.
A total of 10.92 miles (57,659.6 linear ft.) of sewer mains throughout the City of Eden were cleaned
by sewer jet or rodder
A total of 16.15 miles (85,293.01 linear ft.) of sewer mains throughout the City of Eden were
inspected by CCTV.
Treatment Plants
Treatment Plant Operators are on duty 24 hours per day, 7 days per week, to ensure proper
treatment of all incoming wastewater. They monitor plant equipment and do inspections during each shift
to insure process control and the mechanical operation of the equipment. Maintenance personnel are
available each day to service equipment and are on call nights and weekends for emergency repairs in
case the treatment equipment suffers failure. A large parts inventory is maintained of the items that have
historically been prone to failure.
III. Performance
Collection Svstem Ooerations
During the past 12 months, there have been 7 events in which 8 incidents occurred where raw
sewage overflowed or bypassed from the gravity collection system to surface waters. The overflows from
these gravity flow pipelines in the collection system totaled 11,170 gallons, with 6,720 gallons reaching
surface waters. Of the 8 incidents, 2 were caused by W directly from storm water runoff and the resulting
flood waters flowing into the gravity sewer mains. The main cause of these issues have been resolved.
There were 6 overflows that were not caused by I&I. Of these, one incident was caused by roots in
a mahole that was previously unknown to us. One was caused by a failed air relief valve that was
damaged when a check valve failed at a pump station. One was from damage by a contractor hitting the
force main while trying to dig around it. The remaining 2 were forcemain failures. Gravity sewer line losses
account for 2,620 gallons, while force mains account for 6,870 gallons of the sewage lost in the last 12
months.
Of our 20 sewer pump stations, 2 pump stations had sanitary sewer overflows during the last 12
months in 1 event. These were as follows: 1 overflow occurred at Covenant Branch Pump Station
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releasing a total of 1,080 gallons and 1 overflow occurred at Railroad Pump Station releasing a total of 600
gallons. The cause for these overflows was I&I of storm water and flood water.
When overflows or bypasses occurred, the affected sites were evaluated, cordoned off from or
otherwise isolated from the public and/or receiving streams and monitored for environmental impacts as
conditions dictated.
*Numerous sources of I&I continue to be identified and repaired.
**Force Main evaluations are now being pushed.
Treatment Plants Operations
Compliance with North Carolina NPDES (National Pollution Discharge Elimination System) Permit
is based on meeting discharge parameters set forth in the NPDES Permit. This information is reported
monthly to the North Carolina Department of Environment and Natural Resources through self -monitoring
reports. The following is a summary of our plant permit compliance for the last 12 months:
Reporting Month Mebane Bridge Plant
New Street
July 2021 Compliant
Compliant
August 2021 Compliant
Compliant
September 2021 Compliant
Compliant
October 2021 Compliant
Compliant
November 2021 Compliant
Compliant
December 2021 Compliant
Compliant
January 2022 Compliant
Compliant
February 2022 Compliant
Compliant
March 2022 Compliant
Compliant
April 2022 Compliant
Compliant
May 2022 Non -Compliant
Compliant
June 2022 Compliant
Compliant
• In May, the plant experienced a coliform violation due to complications with the peracetic acid trial.
The problems were corrected with no other issues.
IV. Notification
This report will be submitted to the State Division of Water Quality and be released to the local news media
and posted on the City's internet web site at www.edennc.us.
V. Certification
"I certify, under penalty of law, that this document and all attachments were prepared under my direction of
supervision in accordance with a system designed to assure that qualified personnel properly gather and
evaluate the information submitted. Based on my inquiry of the person or persons who manage the
system, or those persons directly responsible for gathering the information, the information submitted is, to
the best of knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fines and imprisonment for knowing
violation."
Jon Mendenhall
Sigrid,re of City Manager
Annual Performance Report
A1l.
Date
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