2014 Annual Compliance Report Operation & Maintenance Of Tara Wastewater System

Transcription

1 2014 Annual Compliance Report Operation & Maintenance Of Tara Wastewater System March 2015 Prepared for: Municipality of Arran-Elderslie 1925 Bruce Road 10 Box 70 Chesley, ON N0G 1L0 Prepared by: GSS Engineering Consultants Ltd. Unit 104D th Ave. W Owen Sound, ON N4K 5R

2 2014 Annual Report Operations and Maintenance of Tara Sewage Works, Municipality of Arran-Elderslie Table of Contents 1.0 INTRODUCTION DESCRIPTION OF FACILITIES Wastewater Treatment Plant Sewage Pumping Station SUMMARY OF WASTEWATER FLOW SUMMARY OF RAW SEWAGE AND EFFLUENT MONITORING SUMMARY OF MAINTENANCE PROGRAM SUMMARY OF COMPLAINTS RECEIVED ASSESSMENT OF SEPTAGE ACCEPTANCE MINISTRY OF THE ENVIRONMENT INSPECTION RECOMMENDATIONS...10 List of Tables Table 1 Summary of Wastewater Flows: 2014 Table 2 Summary of Raw Sewage Monitoring Data: 2014 Table 3 Summary of Effluent Discharge Monitoring: Spring 2014 Table 4 Summary of Effluent Discharge Monitoring: Fall 2014 Appendices Appendix A Certificate of Approval (Sewage) GSS Engineering Consultants Ltd. 2

3 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March 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 # N92 dated January 18, 2005, for this facility which revoked and replaced the Certificate of Approval # dated July 2, 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, 2014 to December 31, 2014), the Tara Sewage Works was operated by the Municipality of Arran-Elderslie. Scott McLeod of Arran- Elderslie was the back-up Overall Responsible Operator (ORO), whereas Rakesh Sharma, was the Overall Responsible Operator. This report has been prepared based on the information provided by the Municipality of Arran- Elderslie. GSS Engineering Consultants Ltd. 1

4 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March DESCRIPTION OF FACILITIES 2.1 Wastewater Treatment Plant 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. GSS Engineering Consultants Ltd. 2

5 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March 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 m³/day and the maximum daily flow was 1,218 m³/day which occurred in April. The total annual flow was 126,244 m³. The design capacity of the treatment plant is 650 m³/day. The capacity utilization of the plant was 53.4% of the design capacity. In 2014, the flow meter was not calibrated as the flowmeter was replaced with a new flow meter. GSS Engineering Consultants Ltd. 3

6 March, 2015 TABLE 1 Summary of Wastewater Flows: 2014 Tara Wastewater Treatment Plant Municipality of Arran-Elderslie Month Total Flow Average Daily Flow Maximum Daily Flow (m³) (m³/day) (m³/day) January 9, February 8, March 11, April 19, ,217.7 May 10, June 7, July 7, August 7, September 9, October 10, November 13, December 11, Total 126,244 Average 10, Maximum 1,218

7 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March 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 2014, raw sewage grab samples were collected in January, April, July and October and tested for the above referenced parameters. 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 21, 2014 to May 14, Fall discharge occurred from November 3, 2014 to December 1, The lagoon contents were sampled and tested for CBOD₅, Total Suspended Solids and Total Phosphorous before and during the discharge period. Tables 3 and 4 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, in the spring of 2014, from the Lagoons was 79,380 m³ and 40,824 m³ in the fall. In 2014, a total of 120,204 m³ of treated effluent was discharged as compared to 126,244 m³ of raw sewage received at the plant. GSS Engineering Consultants Ltd. 4

8 March 2015 TABLE 2 Summary of Raw Sewage Monitoring Data: 2014 Tara Wastewater Treatment Plant Municipality of Arran-Elderslie Month Total Suspended Total CBOD₅ Solids Phosphorous (mg/l) (mg/l) (mg/l) January 21, April 14, July 14, October 7, AVG

9 March 2015 TABLE 3 Summary of Effluent Discharge Monitoring - Sping 2014 Tara Wastewater Treatment Plant Municipality of Arran-Elderslie Cell #1 Cell # 2 Date CBOD₅ TSS Total Total CBOD₅ TSS Phosphorous Phosphorous (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) April 14, April 21, April 23, April 28, April 30, May 5, May 7, < May 12, < May 14, < Average CofA Objectives Cof A Limits Compliance with Effluent Limits Y Y Y

10 March 2015 TABLE 4 Summary of Effluent Discharge Monitoring - Fall 2014 Tara Wastewater Treatment Plant Municipality of Arran-Elderslie Cell #1 Cell # 2 Date CBOD₅ TSS Total Total CBOD₅ TSS Phosphorous Phosphorous (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) October 7, October 16, November 3, <3 < November 6, <3 < November 10, <3 < November 12, <3 < November 17, 2014 < < November 20, < November 24, < November 26, December 1, Average CofA Objectives Cof A Limits Compliance with Effluent Limits Y Y Y

11 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March SUMMARY OF MAINTENANCE PROGRAM 1. There were no sewage bypasses in the year The diesel generator had the annual service completed February 21/2014 at hours. The Oil and Fuel filter on the tank was changed. The pump shafts were greased 2 different times throughout the year. The fuel tank had conditioner added in October. 3. Both alum pumps were provided with new belts in the months of February and March. The alum pump flows were increased 4 different times throughout the year for phosphorus control. 4. There was one sewer lateral blockage at #9 Main Street in March. Foster Sewer services unblocked the lateral service and then flushed the main sewer line on Yonge St. S and Main Street. 5. Spring discharge was completed from April 21st to May 14, ,380 m 3 of effluent was discharged. 6. Eighty rods of page wire fence was installed around the perimeter of the Lagoon property in June and July. The south end fence and a section of the west side fence were replaced. A new entrance gate was also installed at the same time. 7. In July the fire extinguisher was removed and replaced at the pump station door entrance. 8. The raw sewage flow meter (magmeter) was replaced in September with a new ABB meter. 9. During the installation of the flow meter at Mill Street, the 200 mm valve south of By-pass Chamber was broken in the closed position. The valve was replaced with assistance of Foster s Sewer Services and Nickason s pumper truck. 10. The sanitary collection system was flushed in house at the end of September. 11. In October, MH #29, MH #67 and MH # D lids were replaced with telescoping lids. The PVC riser rings were replaced with metal rings at MH #4A and MH #5A. GSS Engineering Consultants Ltd. 5

12 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March Fall discharge took place over 29 days starting on November 3rd and ending on December 1, 2014 discharging approximately 40,824 m3. The effluent limits were met both for spring and fall discharge periods. 13. DJ Peat gave a roof repair estimate for the Mill Street Pumping Station. It was decided to budget for a complete replacement next year instead of a repair. The roof was inspected in-house in December. Drains were cleared and sealing around the drains and vents was completed. 14. There was one new residential sewer connection on Maria Street in Tara and one commercial connection for four 4-plexs on Brook Street West in GSS Engineering Consultants Ltd. 6

13 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March SUMMARY OF COMPLAINTS RECEIVED No Complaints were received in 2014 concerning the Tara Wastewater System. GSS Engineering Consultants Ltd. 7

14 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March 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 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 GSS Engineering Consultants Ltd. 8

15 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March MINISTRY OF THE ENVIRONMENT INSPECTION The Ministry of the Environment did not conduct an inspection of the Tara Sewage Lagoon System in GSS Engineering Consultants Ltd. 9

16

17 2014 Annual Report Operations and Maintenance of Tara Wastewater System, Municipality of Arran-Elderslie March 2015 Appendix A Certificate of Approval (Sewage) GSS Engineering Consultants Ltd.

18

19

20

21

22

23

24

25

26

27

28