NC0024911_July 2022 to June 2023 System Performance Annual Report_20230829

Metropolitan Sewerage District of Buncombe County
System Performance Annual Report
2028 Riverside Drive, William H. Mull Building
Asheville, North Carolina 28804
General Manager
Thomas E. Hartye, P.E.
[phone]
Director of Wastewater Reclamation Facility (WRF)
Bart Farmer (ORC)
[phone]
Operations Manager (WRF)
Schuyler Taylor (ORC—Back-up)
[phone]
Director of Technical Services (Collection System)
Ken Stines (ORC)
[phone]
Director of Construction (Collection System)
Mike Stamey, P.E. (ORC-Back-up)
[phone]

Table of Contents
I. General Information 3
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Plant Location Map with Contours
II. Description of Facilities 4
---------
----------------------------------------------------------------------
Biosolids Production
III. Improvements to Facilities 7
-------------------------------------------------------------------------------
WRF Performance Chart
Construction Totals (In System Services Division)
VI. Performance Measures 11
-------------------------------------------------------------------------------
SSO Report - Monthly
Performance Measures SSO Chart
SSO's per 100 Miles of Sewer Chart for FY23
Customer Service Response Times
Pipeline Maintenance Totals
WRF Pollutant Removals
V. Certification 19
-------------------------------------------------------------------------------
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System Performance Annual Report
Fiscal Year 2023 (July 2022 - June 2023)
L General Information
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Permit Numbers:
NPDES Permit # NC0024911
General Storm Water Permit # NCG 110000 COC # NCG 11015 8
Air Quality (ABAQA) Title V Permit # 11-772-18
Collection System # WQCS00004

II. Description of Facilities
Collection System —System Services
Division
In the fiscal year of 2023 (FY23),
the Metropolitan Sewerage District provided
wastewater service to over 58,900 customers
with an estimated population of 271,534.
This large service area spans the French
Broad River and Swannanoa River Valleys
covering about 260 square miles of land.
Pipes conveying the wastewater from homes
and businesses form an extensive collection
system operated and maintained by our
System Services Division. With over 1,140
miles of public sanitary sewer lines, 40
pump stations and approximately 33,890
manhole access points; significant
manpower and equipment is required. Pipes
vary in size from 66" diameter large
interceptors down to 6" serving residential
communities. Most of the piping within the
District is between 50 and 100 years old and
requires continual upkeep and/or
replacement.
Water Reclamation Facility (WRY)
The Water Reclamation Facility (WRF) is
rated at 40 million gallons per day (MGD)
capacity serving most of Buncombe County
(Asheville, Biltmore Forest, Black Mountain,
Montreat, Weaverville, Woodfin and part of
northern Henderson County). In FY23 an
average flow of 20.88 million gallons per day
were treated with the majority coming from
residences. For the year, 7.6 billion gallons
were treated with more than one-third
coming from Infiltration & Inflow (I&I).
That's the industry term for groundwater
seeping in from cracks in pipes and manholes
or rainwater entering through manhole lids
and unauthorized Storm Water connections.
The District is continually working
to abate this problem.
The design of our wastewater treatment
system is called "attached growth" relying
heavily on 152 rotating biological contactors
(RBC's) to do the bulk of treatment. These
BBC's provide over 400 acres (about 2.5
acres per unit) of surface area for
microorganisms to grow upon. As the
backbone of treatment, these microorganisms
do the heavy lifting providing the return of
clean, safe water back to the French Broad
River; our receiving stream. MSD's facility
is believed to be the largest RBC plant in the
world.
4

II. Description of Facilities WRF Treatment Components
Preliminary Treatment Components
• Influent Multi -rake Barscreens (2 units, 1/2
inch Bar Spacing, 40 MGD each) with
screenings washer/compactor and shaftless
screw conveyer
• Influent Pumps (3 units) - 35 MGD rated
capacity each
• Perforated Plate Fine Screens (3 units, 1/4
inch openings, 40 MGD each) with
screenings washer/compactor
• Vortex Grit Removal (2 units rated at 50
MGD) - Removal Rate 95% of Grit > 140
Mesh
• Storm Surge System - Utilizes three pumps
rated at 5MGD each and two storm surge
tanks rated at 2.1 million -gallons each
Primary Treatment Components
• Primary Clarification - Chemically Enhanced
Kruger ACTIFLO system
(Construction substantially complete in
December of 2021)
Secondary Treatment Components
1 st Stage BBC's (44 units)
2nd Stage RBC's (72 units)
3rd Stage BBC's ( 36 units)
Intermediate Pumps (3 units) - pump
water to clarifier from 3rd RBC stage
Intermediate Clarifier (4 cells - total
volume 2 MG)
Microfiltration via AASI AquaDisk
Units (16 units)
Disinfection Components
• Sodium Hypochlorite solution -
average feed 1000 gallons/day at 6.5%
solution strength
Residuals Handling Components
• Gravity Thickeners (2 units) - 100 foot -
diameter each
2.5 Meter Belt Presses (2 units)
• Fluidized Bed Incinerator (2,651 dry
pounds per hour)
Energy Management Components
• Two separate power circuits from Duke
Energy for plant, with Automatic Transfer
Switch if one fails
• 4-Megawatt total from three Diesel
Generators (emergency backup power for
WRY; will maintain full treatment processes
during a power outage)
• 850 Kilowatt Hydro Turbines (3 units) -
induction units (French Broad River source).
These generate power using the District's
dam/flume. The power is sold back to Duke
Energy.
Automation Components
• SCADA (Supervisory Control and Data
Acquisition) - full automated control of WRF
5

II. Description of Facilities — Sludge Management Plan
MSD utilizes its Fluidized Bed Incinerator as its primary residual management option. Presently
the facility is managing 17-20 dry tons per day of residuals. The facilities are designed for 2,651
dry pounds per hour. Due to the lack of true primary clarifiers, most of the sludge generated at the
facility is secondary in nature (i.e. sloughings from the RBC's).
Sludge is thickened in on -site gravity thickeners to a consistency of 2-5% solids at which time it is
then pumped to the 2 1/2-meter belt presses. These units dewater the sludge to over 22% solids
and then it is pumped to the incinerator. Air emissions from the incinerator are of excellent
quality, and air quality is further enhanced by a new filtration system added in 2016. Incinerator
ash is thickened on -site via a gravity ash thickener and then pumped to an on -site lagoon. Ground-
water is monitored in accordance with NCDEQ requirements (up & down gradient).
The incinerator system provides the most cost-effective method for sludge management.
Supplementary fuel is sometimes required due to the 22% solids content - natural gas via
Dominion Energy is utilized for this purpose.
MSD also maintains an agreement with the local county landfill (lined) to dispose of dewatered
sludge during emergency and/or maintenance activities. This provides a second residuals
management alternative, when or if needed.
BFP Feed %TS
4.0
3.0
H 2.0
1.0
0.0
BFP Cake %TS
24.0
23.0
h
22.0
21.0
20.0
I
I ■ ■ ■ ■ 01��■■■�■ ■W1111
Polymer Usage
7.0
&0
5.0
C 4.0
O
3.0 —
2.0
J 1.0
0.0
Burn Rate
2,400
2,200
2,000 — —
o 1,800 14
1,600
1,400
1,200
1,000
4$ 6} 46 '` Hv¢ fie + it
Dry Tons Burned
900
800
y 700
0 500
~ 400
300
200 A[
100
0
6` 41
0

III. Improvements to Facilities
Collection System Improvements
BI
M
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East Flat
Rock
MSD assumed ownership and
maintenance of the various local public
collection systems in 1990, and since
that time MSD has undertaken an
aggressive program to correct existing
known collection system problems.
Between 1990 and 2023, over 1,378,640
linear feet (or 261 miles) of pipe have
been replaced and over $504 million has
been re -invested in plant and collection
system rehabilitation projects. However,
due to the large size of the MSD system,
there is much work still to be done.
From FY 2024 to FY 2033, the District
expects to rehabilitate or replace an
additional 415,702 linear feet.
Approximately $531.7 million will be
spent for the District's Capital
Improvement Program (CIP) over the
next ten years. Of this, 18% will be
spent on rehabilitating medium to large
Interceptors, 23% on rehabilitating or
replacing small collection lines, and
52% on the treatment plant and pump
station projects.
MSD's Pipe Rating Program is used to objectively prioritize rehabilitation projects throughout
the regional collection system. This published, award winning program utilizes the District's
Geographic Information System (GIS) and database software to collect rating data for each
project. The data include Sanitary Sewer Overflow (SSO) history, customer service requests,
proximity to streams/waterways, structural condition, and monitoring/maintenance schedules by
MSD staff. A priority rating is then generated for each project, which is used to prioritize the ten
-year CIP.
MSD maintains an aggressive Preventative Maintenance Program whereby approximately
898,177 lineal feet (or about 170 miles) of sewer lines were cleaned by high pressure water
jetting equipment. In addition, over 33,140 linear feet of sewer lines are mechanically treated to
remove tree roots and blockages. MSD also maintains its Rights -of -Way to ensure access to the
system for cleaning and maintenance activities. During FY 2023 over 118,395 ft. were cleared.

III. Improvements to Facilities
Water Reclamation Facility (WRF) Performance Measures
During the FY23 annual reporting period, high performance measures were again achieved. The
WRF continues to provide effective/efficient treatment services to the community averaging
wastewater CBOD & TSS removal efficiencies of 93% and 95% respectively (state permit requires a
minimum of 85% removal rates for compliance). The volume of flow to the WRF continues to
remain well below hydraulic capacity for the plant averaging 21.7 million gallons per day. The WRF
remains in compliance for all permitted parameters and receives favorable reviews by NC
Department of Environmental Quality and the Asheville -Buncombe Air Quality Agency.
MSD maintains a service contract agreement with Pace Analytical, Inc. (NC certified lab). This
progressive opportunity continues to yield significant long-term savings to MSD. Also, the WRF
successfully participated in surveillance audits regarding ISO14001 certification, coming through
with zero (0) non -conformances. This program, also referred to as an Environmental Management
System, continues to provide significant benefits to MSD both in the short & long-term.
12,000
10,000
Z
8,000
0
6,000
4,000
2,000
0
WRF Performance FY23
Qp\
�EFF CBOD -CBOD LIMIT EFF TSS TSS LIMrr
8

III. Improvements to Facilities
Water Reclamation Facility Improvements
The High Rate Primary Treatment Project was recommended by the Water Reclamation Facility Plan.
This $17.0 million project will provide high -rate primary clarification and will work in conjunction
with planned process upgrades to assist in meeting future regulations.

III. Improvements to Facilities
Stx SUM
CONSTRUCTION TOTALS BY DATE COMPLETED - Monthly
F, =
From 7/1/2022 to 6/30/2023
Emergency
Oig Up Dig Up Manhole Taps Creek Crossings
ROW
Service Line
Service Line
Dig Ups
Dig Ups
Ml Fig St. Ftg Repairs Installed Cleared
Ftg
tore Ftg
Burst Ftg
July 2022
28
6
63 433 17 10 0
25,839
0
35
August 2022
30
6
70 904 14 27 5
14,647
30
25
September 2022
20
7
32 494 12 17 0
6,291
0
0
October 2022
15
5
46 507 16 29 0
3,940
0
0
November2022
10
5
27 348 17 19 1
26,106
120
0
December 2022
12
9
31 320 10 50 0
0
0
0
January2023
39
9
49 605 17 15 1
0
4
0
February2023
39
12
90 719 15 18 0
720
0
47
March 2023
31
10
95 881 17 39 0
60
0
0
April2023
20
12
123 643 13 22 0
4,000
0
0
May 2023
30
12
155 457 14 9 0
5,000
0
0
June 2023
33
9
83 642 11 18 1
31,792
0
0
Grand Total
307
102
863 6,953 173 273 8
118,395
154
107
p
E
CONSTRUCTION REHAB TOTALS BY DATE COMPLETED - Monthly
From 7/1/2022 to 6/30/2023
IRS
Const
Mainline
Mainline
Total
# IRS
IRS
Accept
Const Ftg
Accept
#D-8
D-R
#MH
PB
Bore
Rehab
Repairs
Ftg
Ftg
Ftg
Ftg
Ftg
Ftg
Ftg
July 2022
0
0
0
435
435
1
1233
7
30
0
1698
August 2022
0
0
0
0
0
2
1040
6
0
0
1040
September 2022
0
0
0
0
0
1
435
3
0
0
435
October 2022
0
0
0
350
350
1
592
7
0
0
942
November 2022
0
0
0
0
0
1
627
4
0
0
627
December 2022
0
0
0
223
223
2
383
4
0
0
606
January2023
0
0
0
18
40
1
434
3
0
0
474
February 2023
0
0
0
0
0
1
987
11
0
0
987
March 2023
0
0
0
351
351
1
67
1
0
0
418
Apri12023
0
0
0
0
0
1
630
2
0
0
630
May 2023
2
153
317
0
0
3
1142
7
0
0
1459
June 2023
1
182
182
0
0
1
201
0
0
0
383
Grand Totals
3
335
499
1377
1399
16
7771
55
30
0
9699
10

IV. Performance Measures
Collection System, System Services Division Performance Measures
System Services division completed and submitted to NCDEQ-DWR two six-month High Priority
Line Inspection Reports. The High Priority Line report documents inspection of aerial lines,
siphons and lines in proximity to vulnerable creeks and streams.
The collection system recorded 25 sanitary sewer overflows (SSO's) which equates to 2.2 SSO's
per 100 miles of sewer. All SSO's were remediated according to the District's standard operating
procedures for sanitary sewer overflow cleanup and no severe environmental impact occurred.
Number of SSO's1100 miles of Sewer
14
■
11
L
41 10
3
d
w
0 8
N
d
C 6 ■
■
0 ■
a \
■
■
0
o� °a ", oe o1 do titi titi " ti°' by .,`° y1 tiA 11 titi titi y�,
do ,yo ,yo ,yo do ,yo ,yo ,yo ,yo ,yo do ,yo ,yo do ,yo,lips**,yo ,yo ,yo ,yo ,yo
Fiscal Year
11

Sanitary Sewer Overflows
120
100
80
a
0
60
40
20
0
+ssOs
FY03
FY04
FY05
FY06
FY07
FY08
FY09
FY10
FY11
FY12
FY13
FY14
FY15
FY16
FY17
FY18
FY19
FY20
FY21
FY22
FY23
114
1 78
1 78
1 55
1 52
1 41
1 23
1 34
1 24
1 25
1 37
1 36
1 37
1 53
1 30
1 25
1 40
1 19
1 11
1 26
1 25
SSO Cant
AVG Response
Time (min.)
July, 2022
0
0
August, 2022
3
17
September, 2022
2
29
October, 2022
2
30
November, 2022
0
0
December, 2022
1
13
January, 2023
2
126
February, 2023
4
27
March, 2023
2
30
April, 2023
4
28
May, 2023
2
0
June, 2023
3
34
Fiscal Year
SSO Report - Monthly
From 7/1/2022 to 6/30/2023
AVG SSO
AVG Surface spilk " 1000
Spills >= 15,000
Total SSO
Total Surface
Volume (gal.)
Volume (gal.) Gallons
Gallons
Volume (gal.)
Volume (gal.)
0
0 0
0
0
0
280
280 0
0
840
940
600
600 0
0
1,200
1,200
655
655 0
0
1,310
1,310
0
0 0
0
0
0
700
700 0
0
700
700
500
500 0
0
1,000
1,000
793
509 2
0
3,173
2,034
4,196
1,696 1
0
8,392
3,392
448
448 0
0
1,791
1,791
6,781
6,781 1
0
13,561
13,561
395
395 0
0
1,186
1,186
Grand Totals: 25 32 1,326 1,081 4 0 33,153 27,014
12

IV. Performance Measures
CUSTOMER SERVICE REQUESTS
Monthly - All Crews
DAY 1ST RESPONDER
July, 2022
115
2S 31
August, 2022
83
30 37
September, 2022
90
30 40
October, 2022
83
29 36
November, 2022
85
28 32
December, 2022
71
27 50
January, 2023
129
28 31
February, 2023
152
28 30
March, 2023
152
29 32
April, 2023
108
31 35
May, 2023
103
26 36
June, 2023
96
25 35
NIGHT 1ST RESPONDER
July, 2022
August, 2022
September, 2022
October, 2022
November, 2022
December, 2022
January, 2023
February, 2023
March, 2023
April, 2023
May, 2023
June,2023
1,267
28
35
41 25 19
41 26 24
35 35 26
28 2S 34
34 41 38
33 33 34
69 33 22
43 30 23
44 33 28
41 30 27
21 33 26
30 31 26
460 31 26
ON -CALL CREW •
July, 2022 29 40 39
August, 2022 29 29 60
• On -Call Crew Hours: 8:00pm-7:30am (Jul. - Oct.) 11:30pm-7:30am (from Nov. onward) Monday-Fnday, :veekends, and Ho:idays
8/4/2023
13

IV. Performance Measures
ON -CALL CREW •
September, 2022
October, 2022
November, 2022
December, 2022
January, 2023
February, 2023
March, 2023
April, 2023
May, 2023
June,2023
Grand Totals:
CUSTOMER SERVICE REQUESTS
Monthly - All Crews
27
56
67
35
62
58
28
49
51
48
60
53
60
67
33
35
52
38
34
55
32
33
43
51
31
67
50
24
67
37
413 55 46
2,140
34
35
• On -Call Crew Hours: 8:00pm-7:30am )Jul. - Oct.) 11:30pm-7:30am (from Nov. onward) Monday -Friday, weekends, and Holidays
8/4/2023 page 2 of 2
14

IV. Performance Measures
S MEW
PIPELINE MAINTENANCE TOTALS
BY DATE COMPLETED - Monthly
��'•
July 01, 2022 to
June 30, 2023
Main Line Wash
Service Line Wash Rod line
Cleaned
CCiv
Smoke
SL-RAT
Footage
Footage
Footage
Footage
Footage
Footage
Footage
2022
July
100,862
4,736
1,390
102,252
14,226
50
1,886
August
95,363
1,583
0
95,363
29,701
0
6,165
September
51,254
1,193
1,816
53,070
21,909
0
5,747
October
60,901
1,089
5,221
66,122
24,032
493
10,894
November
15,578
1,676
1,365
16,943
17,617
450
16,220
December
30,535
1,598
2,136
32,671
8,109
0
26,472
2023
January
46,950
2,797
3,209
50,059
13,499
0
25,849
February
64,673
1,804
4,788
69,461
14,134
225
21,635
March
120,867
1,255
3,216
124,083
34,382
2,835
25,210
April
73,685
1,388
1,890
75,575
16,556
0
2,341
May
122,550
1,437
4,734
127,284
25,538
805
7,822
June
115,059
4,930
3,375
118,434
22,921
0
23,330
Grand Total:
898,177
25,486
33,140
931,317
242,624
4,858
173,571
Avg Per Month:
74,848
2,124
2,762
77,610
20,219
405
14,464
15

IV. Performance Measures
Water Reclamation Facility (WRF) Performance Measures
Month
INF CBOD
EFF CBOD
% Removal
Req'd % Removal
July
207.4
13.1
94%
85%
August
222.6
17.3
92%
85%
September
225.0
15.6
93%
85%
October
226.4
16.3
93%
85%
November
242.0
13.2
95%
85%
December
189.9
22.3
88%
85%
January
193.4
16.8
91%
85%
February
204.5
13.6
93%
85%
March
223.1
11.8
95%
85%
April
228.9
15.2
93%
85%
May
216.5
15.6
93%
85%
Junel
198.E
1 17.9
91%
8S%
Average
96%
94%
92%
0
E 90%
a,
0
88%
86%
84%
82%
80%
-% Removal
WRF CBOD% Removal FY23
-Req'd %Removal
:1 -�; N N N r L >, a]
0) E E E
Q 0 aU aU C
O 0 ti
16

IV. Performance Measures
Water Reclamation Facility (WRF) Performance Measures
Month
INF TSS
EFF TSS
% Removal
Req'd % Removal
July
241.5
10.5
969,,o'
859/0
August
247.9
10.6
969/o
85%
September
259.8
9.4
969/o
851X0
October
262.7
12.4
959/0
859/0
November
256.7
11.8
959/0
85%
December
223.8
18.6
92%
859/0
January
208.2
16.8
929,,o'
859/0
February
211.6
13.8
939/0
859/0
March
231.7
11.2
95%
85%
April
249.2
1 0.7
969,G
859/0
May
245.4
10.5
969/o
859/0
June
261.4
17.9
939/o
851X0
Average s
val 95%
98%
96%
94%
92%
0 90%
E 88%
a�
86%
84%
82%
80%
78%
-% Removal
WRF TSS % Removal FY23 �Req'd % Removal
(D a) N W >' �' � cv C
Qo �
Q O > U
00 (D
� z
17

IV. Performance Measures
Hydroelectric Performance Measures
MSD operates a hydroelectric facility with three (3) horizontal turbines that produce electrical power.
This energy is then sold back to the electrical grid to Duke Energy. These turbines benefit MSD
because it offsets the cost of energy used to operate the WRF. The treatment of wastewater is an
energy hungry process, but the hydroelectric facility allows MSD to save $300,000 to $600,000 in
energy costs per year. The variation in savings is dependent on rainfall and maintenance requirements
that occur during the year.
Task
FY21
FY22
FY23
Daily (average) Flow, treated MGD
23.9
22.2
20.88
Maximum daily flow treated, MGD
67.3
53.7
60.00
Dry tons of bio-solids processed
6,841
7,834
5,419
Cost per million gallons (MG), treated
$708
$575
$730
Energy cost per MG. treated
$91
$136
$139
Carbonaceous biochemical oxygen demand (CBOD) removal, %
92%
93%
93%
Total suspended solids (TSS) removal efficiency, %
93%
94%
95%
Number of NPDES permit non-compliance
1
1
0
Preventative to corrective maintenance ratio
70:30
70:30
70:30
18

V. Certification
I certify tinder penalty of law that this report is complete and accurate to the best of my knowledge. I
further certify that this report has been made available to the users and customers of the MSD system
and that those users have been notified of its availability.
E. Hartye, P.E.
August 29, 2023
General Manager L
Metropolitan Sewerage District of Buncombe County, NC
If you would like more information please email [e-mail]
19