Tara Wastewater - Municipality of Arran

2013 Annual Compliance Report
Operation & Maintenance
of
Tara Wastewater System
March 2014
13-028
Prepared for:
Municipality of Arran-Elderslie
1925 Bruce Road 10
Box 70
Chesley, ON
N0G 1L0
Prepared by:
GSS Engineering Consultants Ltd.
Unit 104D
1010 9th Ave. W
Owen Sound, ON
N4K 5R
2013 Annual Report – Operations and Maintenance of
Tara Sewage Works, Municipality of Arran-Elderslie
Table of Contents
1.0
INTRODUCTION ............................................................................................................. 1
2.0
DESCRIPTION OF FACILITIES ...................................................................................... 2
2.1
Wastewater Treatment Plant ........................................................................................ 2
2.2
Sewage Pumping Station ............................................................................................. 2
3.0
SUMMARY OF WASTEWATER FLOW ........................................................................... 3
4.0
SUMMARY OF RAW SEWAGE AND EFFLUENT MONITORING ................................... 4
5.0
SUMMARY OF MAINTENANCE PROGRAM .................................................................. 5
6.0
SUMMARY OF COMPLAINTS RECEIVED ..................................................................... 6
7.0
ASSESSMENT OF SEPTAGE ACCEPTANCE ............................................................... 7
8.0
MINISTRY OF THE ENVIRONMENT INSPECTION........................................................ 8
9.0
RECOMMENDATIONS ................................................................................................... 9
List of Tables
Table 1
Summary of Wastewater Flow
Table 2
Summary of Raw Sewage Monitoring
Table 3
Summary of Lagoon Contents Monitoring
Table 4
Summary of Effluent Discharge Monitoring: Spring 2013
Table 5
Summary of Effluent Discharge Monitoring: Fall 2013
Appendices
Appendix A
Certificate of Approval (Sewage)
Appendix B
Calibration Report
GSS Engineering Consultants Ltd.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
1.0
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INTRODUCTION
The Tara Sewage Works, in the Municipality of Arran-Elderslie, is comprised of a wastewater
treatment plant and a sewage pumping station. The wastewater generated within Tara is
collected in the sewer system and is pumped to the wastewater treatment plant by way of a 200
mm diameter forcemain. The wastewater treatment plant comprises of two (2) waste stabilization
ponds equipped with season discharge provisions. The plant has influent and effluent structures
and a 400 mm diameter outfall sewer to the Sauble River.
The Municipality of Arran-Elderslie has retained the services of GSS Engineering Consultants
Ltd. to prepare the Annual Compliance Report for the Tara Sewage Works. The Ministry of
Environment issued an Amended Certificate of Approval # 9456-659N92 dated January 18, 2005,
for this facility which revoked and replaced the Certificate of Approval # 1-704-80-006 dated July
2, 1980. Refer to Appendix A for Certificate of Approval. The Certificate of Approval stipulated
preparation of an annual report addressing the following items:





Summary of all monitoring data and a comparison to the effluent limits.
Summary of operational problems encountered and corrective actions taken.
Summary of maintenance carried out.
Summary of complaints received and steps taken to address the complaints.
Summary of all by-pass, spill or abnormal discharge events.
.
During the reporting period of this Annual Report (January 1, 2013 to December 31, 2013), the
Tara Sewage Works was operated by the Municipality of Arran-Elderslie. Scott McLeod of ArranElderslie was the Overall Responsible Operator (ORO), whereas Rakesh Sharma, was the
backup ORO.
This report has been prepared based on the information provided by the Municipality of ArranElderslie.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
2.0
DESCRIPTION OF FACILITIES
2.1
Wastewater Treatment Plant
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The wastewater treatment plant comprises of two (2) waste stabilization ponds, each with an area
of 3.95 Ha. The depth of the cells is approximately 1.5 m and are provided with influent and
effluent structures and piping. A 200 mm diameter inlet forcemain carries sewage to the waste
stabilization ponds. A 400 mm diameter outfall sewer discharges the treated effluent from the
waste stabilization ponds to the Sauble River during the spring and fall discharge periods.
2.2
Sewage Pumping Station
The sewage pumping station is located north of Mill Street and is equipped with two (2) vertical,
centrifugal, dry pit, non-clog pumps (one duty and one standby) each capable of pumping 27.4
L/s against a total dynamic head of 21.5 m. The discharge forcemain at the sewage pumping
station has a 150 mm magnetic flow meter and an emergency bypass connection. Two (2)
positive displacement diaphragm-type chemical metering pumps (one duty and one standby),
each capable of pumping 40 L/h of Alum for phosphorous removal, provide alum dosing into the
forcemain. An emergency overflow, which permits overflow to the Sauble River, is provided from
a manhole located in the inlet sewer. A 50kW diesel generator to provide standby power is also
installed at this facility.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
3.0
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SUMMARY OF WASTEWATER FLOW
A summary of the wastewater flows received at the wastewater treatment plant is provided in
Table 1. As can be noted from Table 1, the average daily flow was 354.8 m³/day and the
maximum daily flow was 1,298 m³/day which occurred in January. The total annual flow was
129,401 m³. The design capacity of the treatment plant is 650 m³/day. The capacity utilization of
the plant was 54.6% of the design capacity.
In April 2013, the flow meter was calibrated by Flowmetrix Inc. and the percentage error was
found to be acceptable. Refer to Appendix B.
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March, 2014
TABLE 1
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Summary of Wastewater Flows: 2013
Tara Wastewater Treatment Plant
Municipality of Arran-Elderslie
Total Flow
Average Daily Flow
Maximum Daily
Flow
(m³)
(m³/day)
(m³/day)
January
13,257.0
424.4
1,297.7
February
11,206.9
400.2
500.7
March
13,851.6
446.8
1,161.3
April
16,434.7
547.8
1,209.5
May
10,657.0
343.8
450.4
June
8,087.5
269.6
366.1
July
7,933.8
255.9
346.5
August
7,277.7
234.8
337.9
September
7,559.9
252.0
339.2
October
11,547.7
372.5
941.8
November
12,366.2
412.2
822.6
December
9,220.6
297.4
531.6
Total
129,401
Month
Average
Maximum
10,783.38
354.8
1,298
2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
4.0
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SUMMARY OF RAW SEWAGE AND EFFLUENT MONITORING
The Certificate of Approval (CofA) requires that the raw sewage be tested for CBOD₅, Total
Suspended Solids (TSS) and Total Phosphorous (TP) on a quarterly (once every three (3)
months) basis. In 2013, raw sewage grab samples were collected in January, April, July and
October and tested for the above referenced parameters. An additional sample was collected in
April 25, 2013 because April 9th sample indicated much lower concentration for CBOD₅, Total
Suspended Solids and Total Phosphorous. Table 2 shows the summary of raw sewage
monitoring data.
The CofA also requires the testing of lagoon contents for CBOD₅, Total Suspended Solids and
Total Phosphorous once, within one (1) week prior to each seasonal discharge. Spring discharge
occurred from April 19, 2013 to May 14, 2013. Fall discharge occurred from November 1, 2013
to December 2, 2013. The lagoon contents were sampled and tested for CBOD₅, Total
Suspended Solids and Total Phosphorous before and during the discharge period. Table 3
shows the summary of the monitoring data for Cell#1 and Cell#2 contents during and prior to
discharge. The effluent limits were met during both the spring and fall discharge periods.
The volume discharged from the Lagoons was 86,940 m³ in the spring of 2013 and 60,858 m³ in
the fall. In 2013, a total of 147,798 m³ of treated effluent was discharged as compared to 129,401
m³ of raw sewage received at the plant.
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TABLE 2
March 2014
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Summary of Raw Sewage Monitoring Data: 2013
Tara Wastewater Treatment Plant
Municipality of Arran-Elderslie
Month
January 24, 2013
April 9, 2013
April 25,2013
July 23, 2013
October 8,2015
CBOD₅
(mg/L)
153
12
147
65
237
Total Suspended
Solids
(mg/L)
168
60
168
132
500
Total
Phosphorous
(mg/L)
6.94
0.75
7.24
4.24
6.17
March 2014
Date
April 13, 2013
April 19, 2013
April 22,2013
April 24,2013
April 29, 2013
May 1, 2013
May 6,2013
May 8, 2013
May 13,2013
May 14,2013
Average
CofA Objectives
Cof A Limits
Compliance with
Effluent Limits
TABLE 3
Summary of Effluent Discharge Monitoring - Sping 2013
Tara Wastewater Treatment Plant
Municipality of Arran-Elderslie
Cell #1
Cell # 2
Total
CBOD₅
TSS
CBOD₅
TSS
Phosphorous
(mg/L)
(mg/L)
(mg/L)
(mg/L)
(mg/L)
20
36
0.38
<3
5
6
15
0.22
8.00
17
7
11
0.21
6
19
7
9
0.23
11
16
5
6
0.20
8
14
6
9
0.19
7
17
4
4
0.2
4
10
10
7
0.34
<1
4
12
12
0.61
<3
3
9
9
0.59
<3
3
8.6
11.8
0.317
7.33
10.8
25
30
30
40
Y
Y
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Total
Phosphorous
(mg/L)
0.04
0.19
0.19
0.2
0.21
0.19
0.22
0.16
0.05
0.09
0.154
0.8
1
Y
March 2014
Date
October 1,2013
October 25,2013
November 1, 2013
November 4,2013
November 6,2013
November 11, 2013
November 13, 2013
November 18, 2013
November 21, 2013
November 25, 2013
November 28, 2013
December 2, 2013
Average
CofA Objectives
Cof A Limits
Compliance with
Effluent Limits
TABLE 4
Summary of Effluent Discharge Monitoring - Fall 2013
Tara Wastewater Treatment Plant
Municipality of Arran-Elderslie
Cell #1
Total
CBOD₅
TSS
CBOD₅
Phosphorous
(mg/L)
(mg/L)
(mg/L)
(mg/L)
27
20
1.37
<3
11
12
1.04
<3
10
20
1.02
<3
10
16
0.81
<3
8
20
0.69
4
11
20
0.6
4
11
20
0.52
4
11
28
0.94
<3
9
16
0.72
4
17
32
1.05
5
21
16
0.66
7
15
8
0.91
10
13.42
19.00
0.86
5.43
25
30
Y
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Cell # 2
(mg/L)
<3
8
7
7
6
5
9
11
5
9
8
11
7.82
30
40
Total
Phosphorous
(mg/L)
0.66
0.41
0.35
0.31
0.31
0.27
0.3
0.27
0.27
0.3
0.34
0.64
0.37
0.8
1
Y
Y
TSS
2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
5.0
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SUMMARY OF MAINTENANCE PROGRAM
1. There were no sewage bypasses in the year 2013.
2. The annual service on the diesel generator was completed on January 22, 2013 which
included an oil and coolant change, oil and fuel filter change and belt changes. The linkages
were also lubricated. The service was performed at 1,098 hours runtime.
The pump shafts were greased at 3 different times through the year. The fuel tank was filled
in December, 2013.
3. Spring discharge was completed from April 19th to May 14, 2013. Approximately 86,940 m³
of effluent was discharged.
Fall discharge was completed over 31 days from November 1st to December 2nd, 2013.
Approximately 60,858 m³ of effluent was discharged. The effluent limits were met during
spring and fall discharge periods.
4. In May, the valve between Cell #1 and Cell #2 was operated during spring discharge. Marker
stakes were placed in the field marking location of manholes for the force main and effluent
sewer pipe.
5. Flowmetrix calibrated the raw (mag) flow meter at the pumping station on April 17, 2013.
6. A new battery was installed for the standby diesel generator set in July, 2013. The runtime
hour reading was 1,105 hours. The charging indicator light socket for the generator was
replaced in August, 2013.
7. The alum pumps feed rate was increased during September and October months. The feed
rate was decreased in November, 2013. A delivery of 20,000 litres of alum was received in
November, 2013. The annual average alum dosage was 83.5 mg/L.
8. The Pumping Station Wet Well was cleaned by removing grease and soap build-up on the
walls by Foster’s in September, 2013. The sewer collection mains were flushed in-house from
October 10 to October 15, 2013.
9. At the pumping station, welded wire mesh was installed around the pump motor shaft stands.
The two 8-inch valves located in the driveway, were also operated. The building door sweeps
were replaced.
10. One (1) new residential sewer connection was installed for Doug Trelford, at 94 Maria Street.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
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SUMMARY OF COMPLAINTS RECEIVED
No Complaints were received in 2013 concerning the Tara Wastewater System.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
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ASSESSMENT OF SEPTAGE ACCEPTANCE
In January 2005, Henderson Paddon & Associates Ltd., produced a report entitled “Assessment
of Wastewater Treatment Plants in the Municipality of Arran-Elderslie to Treat Septage”. This
study concluded and recommended the following:
1. The Tara lagoons could accept 1.5 loads of septage at 13.6 m³ (3,000 1GAL) per load per
week, from May 1 to October 31.
2. During the winter time, this rate should be reduced to one (1) load every two (2) weeks.
3. Improvements to the lagoon to facilitate receiving this septage should be important.
4. It must be recognized that the receipt of septage at the lagoons will increase the sludge
accumulation rate in the lagoons.
No septage was accepted at the Tara Wastewater Treatment Plant in 2013.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
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MINISTRY OF THE ENVIRONMENT INSPECTION
The Ministry of the Environment did not conduct an inspection of the Tara Sewage Lagoon
System in 2013.
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2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
Appendix A
Certificate of Approval (Sewage)
GSS Engineering Consultants Ltd.
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13-028
2013 Annual Report – Operations and Maintenance of
Tara Wastewater System, Municipality of Arran-Elderslie
Appendix B
Calibration Report
GSS Engineering Consultants Ltd.
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