Water Treatment Plant 2016 Summary Report

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1 Water Treatment Plant 2016 Summary Report

2 Table of Contents Overview... 4 SECTION 1 FAILURE TO MEET REQUIREMENTS Adverse Water Quality Incident reports (Drinking Water System) Ministry Orders Drinking Water System Water Treatment Subsystem Water Distribution Subsystem Additional Known Failures to Meet Requirements Drinking Water System Water Treatment Subsystem Water Distribution Subsystem Additional concerns regarding meeting requirements Drinking Water System Water Treatment Subsystem Water Distribution Subsystem... 9 SECTION 2 SUMMARY OF PLANT FLOWS Raw Water (Source water) Maximum Raw Water Flow: Service Water (Treated Discharged Water) Average Daily Service Water Flow: Service Water Discharge: Plant process water Backwash water to Waste: SECTION 3 SUMMARY OF DRINKING WATER SYSTEM ABILITIES Water Treatment Ability Disinfection ability Chlorine Dioxide use ph adjustment (use of lime) Coagulation abilities Pumping capacity Computer System... 13

3 3.2. Water Taking Ability Water Storage Ability Water Treatment and Distribution Personnel Table 1 Summary of Flows January 1, 2016 to December 31, Table 2 Historical Average Daily Service Water Flow (m3) Table Raw Water Taking Perth Water Treatment Plant... 18

4 2016 Summary Report Overview The Town of Perth Drinking Water System (DWS), categorized as a large municipal residential system, is comprised of two components: 1. Class III Water Treatment Subsystem, 2. Class I Water Distribution Subsystem. This report is prepared in accordance to the Drinking Water Systems Regulation 170/03, Schedule 22 of the Safe Drinking Water Act, (SDWA), It will cover a period for the preceding calendar year, January 01 to December 31, A Ministry of Environment inspection of both facilities was conducted between December 14 and 22, 2016 for the 2016 reporting year. The report is not available to date. The completion and presentation of this report will also fulfill the requirement for a compliance report to be produced in accordance applicable regulations. Supplemental information sources would include, but not limited to, The Town of Perth Water Treatment Plant s year end documentation. Section 1 contains, any known failure to meet, or any priority concerns that might lead to failures to meet, the requirements of: the SDWA itself, the SDWA regulations and associated MOE publications, the system s Certificate of Approval, any orders duration of the failure, and measures taken to correct the failure Section 2 contains, A summary of quantities and flow rates of water taken from the Tay River, in addition to water production and process wastewater generation. Perth Water Treatment Plant Summary Report 2016 Page 4

5 Section 3 contains, an overview summary of the DWS water treatment abilities a summary of the DWS water taking ability a summary of the DWS water storage ability a summary of the DWS operating personnel Perth Water Treatment Plant Summary Report 2016 Page 5

6 SECTION 1 FAILURE TO MEET REQUIREMENTS 1.1 Adverse Water Quality Incident reports (Drinking Water System) On Apr 29, 2016 an AWQI was generated when a Distribution Water Sample test result exceeded the allowable concentration. The test was conducted through a voluntary program that the municipality participates in with the MOECC. The parameter is regulated through Sched 24 of OReg 169 and therefore was still considered adverse in spite of being part of a voluntary program. The proper steps for reporting and Adverse were followed, together with consultation with local MOECC Inspector. Re-sampling and testing was completed, and subsequent test results were within allowable limits. It was determined that the exceedance may have resulted from the specific sampling site (washroom tap) and the location for future samples was changed to prevent a re-occurrence. Typically a Sched 24 exceedance, would then require the municipality to increase its sampling frequency, however, discussion with MOECC Inspector resulted in that requirement being waived. Notice of Issue Resolution was submitted on May On Oct , during a valve replacement initiative by staff and contractor, a portion of the storage reservoir was contaminated with hydraulic oil. The small chamber where the spill occurred was isolated and extensively cleaned by staff and spill professionals. Again, proper AWQI notification was made as well as consultation with MOECC and MOH, due to the nature of the incident. Extensive follow up sampling of various parameters mainly hydrocarbons) was completed and all results were satisfactory. Notice of Issue Resolution was submitted on Oct Perth Water Treatment Plant Summary Report 2016 Page 6

7 Incident Date Parameter Result Regulatory Limit Corrective Action Corrective Action Date Re-sample 1,4 and test Apr 29 Dichlorobe (upstream, 2016 nzene ug/l ug/l downstream) May Oct Treated Water Storage contaminati on Various levels of hydrocar bons n/a Isolated, cleaned, resampled Oct Ministry Orders Drinking Water System No MOE orders issued Water Treatment Subsystem No MOE orders issued Water Distribution Subsystem No MOE orders issued. 1.3 Additional Known Failures to Meet Requirements Perth Water Treatment Plant Summary Report 2016 Page 7

8 At the time of compilation of this summary report the MOE s inspection report for this period had not yet been received. There were zero non- compliance items in the 2015 Inspection Report, resulting in a 100% Inspection Rating for the municipality. A summary of Inspection recommendations and best practices is included in Appendix Drinking Water System No known failures to meet requirements Water Treatment Subsystem Requirement failure Requirement location Duration of failure Any corrective action taken none Water Distribution Subsystem Requirement failure Requirement location Duration of failure Any corrective action taken none 1.4 Additional concerns regarding meeting requirements Drinking Water System Issue Any corrective action taken none Perth Water Treatment Plant Summary Report 2016 Page 8

9 Water Treatment Subsystem Issue Any corrective action taken or being proposed Process Waste / Residue Management In 2015 the, Phase 1, of the process waste treatment system was completed and implemented through the Geotube System. This included treatment of the settled solids from the former siphon discharge. Phase 2 development is continuing and includes treatment of all other sources of water to the waste channel Water Distribution Subsystem Issue Any corrective action taken or being proposed none Perth Water Treatment Plant Summary Report 2016 Page 9

10 SECTION 2 SUMMARY OF PLANT FLOWS 2.1 Raw Water (Source water) When reviewing the 2016 raw water flows (from source), and the allowable water taking ability in accordance with the current Permit to Take Water (PTTW), of 9,090 m 3 : See Table 1 at end of document. Table 3 at end of document shows a complete listing of Daily Raw Water Taking in Average Daily Raw Water Flow: The daily average raw water flow was 2,817 m³ in 2016, or approximately 31% of the PTTW, The daily average in 2015 was 3,214 m³ showing continued consistent water demand over recent years Maximum Raw Water Flow: The maximum raw water flow in any given day in 2016 was 5,396 m³ which is 59.4% of the PTTW maximum. 2.2 Service Water (Treated Discharged Water) Below are salient points regarding 2016 service water flows (treated water to the distribution system) Average Daily Service Water Flow: The daily average service water flow was 2,656 m³ in This represents a significant decrease of 401 cubic metres or 13% from 2015 (3,057 m³ was the average in 2015) Service Water Discharge: In 2016, a total of 972,383 m 3 service water was discharged to the Town. Decreased from 2015 (1,115,473 m³) 2.3 Plant process water The 2016 year continued to see a significant change to the management of process waste water at the facility. The plant was built to direct all sources of process waste (settled sludge, backwash water) to a sub-grade channel that conveyed waste back to the source, at a deposit point downstream of the intake. This issue had been identified on previous MOECC reports and after working with the Ministry and various consultants a system was installed to further treat this process waste in This system receives wasted sludge to a mixing tank where a polymer is added to form floc and is then pumped to a Geobag which allows for dewatering and containment of the sludge. A network of bags allows for rotational use and disposal of dried sludge at the Town s landfill site. The project was broken into two phases. Phase 1 (settled sludge from coagulation/settling process), was completed and implemented in March of The Drinking Water License was amended to regulate the maximum Perth Water Treatment Plant Summary Report 2016 Page 10

11 allowable concentration of Total Suspended Solids from the system. The second phase of implementation will address all other sources of waste with the backwash water being the largest volume. Completion had been mandated for Dec , however this was extended to July The rationale behind the extension was to allow the municipality to upgrade the filters and associated backwashing methods, with a positive displacement air scour system, which in turn, has greatly reduced backwash waste volumes, but still maintained backwash effectiveness Waste Volumes In the 2016 calendar year, a total volume of 12,267 m3 has been directed to the residue treatment system and thereby lessening the amount of solids deposited back to the river. Perth Water Treatment Plant Summary Report 2016 Page 11

12 SECTION 3 SUMMARY OF DRINKING WATER SYSTEM ABILITIES 3.1. Water Treatment Ability The Perth water treatment plant continues to maintain a strong position in supporting its ability to provide a reliable supply of safe, clean drinking water to its community. Funding reserves are maintained in case of an operational emergency or unexpected major breakdown Disinfection ability Disinfection of the drinking water is ultimately achieved through two points of application primary disinfection dosed as water enters the clear well and secondary disinfection dosed at the treated water discharge point. Both of these critical treatment processes have redundancy in the pumps as well as the dosage lines. It should be noted that many other factors contribute to the overall disinfection process, including pre-treatment, coagulation and ph control. Varying raw water conditions require operators to adjust and control chemical dosages to meet regulations in a cost effective manner. Of most importance is the daily CT calculation. The CT value is the product of the concentration of a disinfectant and the contact time with the water being disinfected. As mentioned in previous reports the proximity and position of the sodium hypochlorite and coagulant tanks is a potential safety hazard. Accidental contact between the two chemicals produces a highly exothermic reaction releasing chlorine gas. The building analysis of 2011 reviewed chemical storage at the plant and determined that long-term safe chemical handling should be addressed. Tender No. PS was circulated in November 2013 and listed the safety concerns that need to be addressed in the chemical room. Some ventilation issues were addressed, however, separated chemical storage was not. Spill containment was installed in the acid room in This item has been noted on the annual MOE Inspection reports for many years and continues to be an area of concern, especially as unmanned automated operations are on the horizon Chlorine Dioxide use Chlorine dioxide continues to be generated seasonally on site and plays an important role in achieving disinfection while mitigating the formation of chlorine disinfection by-products such as THM s and HAA s (see above). These disinfection by-products are suspected carcinogens and are commonly formed when high doses of chlorine gas or sodium hypochlorite react with raw water heavily laden with organic matter. Chlorine dioxide use is uncommon among water treatment facilities due to chemical cost however the advantage of a cleaner disinfection process with less by-product formation is worth the extra cost during extreme seasonal water quality Perth Water Treatment Plant Summary Report 2016 Page 12

13 challenges seen in Perth. As well, the renewal of the municipal Drinking Water License saw the additional sampling requirement of Chlorates and Chlorites added as a quarterly sampling requirement ph adjustment (use of lime) Following the coagulation and disinfection processes, where the ph of the water is lowered through the addition of chemicals, hydrated lime needs to be mixed in the clearwell to return the ph to a range of 7.1 to 7.3. This range is desired in an effort to ensure the water within the distribution system is close to neutral and thereby not aggressive in the deterioration of the distribution network as well as homeowner plumbing and fixtures. The Town of Perth qualified for relief from the legislated lead sampling program in 2011 as a result of few exceedances of the lead maximum allowable concentration Coagulation abilities The water treatment plant employs a high-end coagulant called PAX XL-6 to aid in the flocculation and sedimentation of suspended solids in water prior to filtration. Although more expensive than conventional coagulants such as aluminum sulphate, product usage is reduced and outperforms other less expensive chemicals at certain critical temperature ranges. Winter months and the associated cold water temperature and density present the most difficult conditions for the coagulant to settle the solids. Our new licence allows for ph enhancement (use of HCl) in situations of high ph or alkalinity raw water conditions that make floc formation difficult Pumping capacity The total volume of treated water pumped from the WTP in 2016 was 972,383 m³. This total has decreased from 2015, but generally represents the average from the past 5 years. Continued reconstruction, maintenance, leak repairs, decreased industry usage, and public awareness of water conservation are all attributed to considerably less water demand. (2005 treated water pumped 1,583,302 m³) Computer System A new SCADA (Supervisory Control and Data Acquisition) system was completed in 2014; however some modifications and additions to the programming are still required. With the objective of low lift automation, numerous pieces of equipment, chemical pumps and analyzers are still being added to the infrastructure and controls for these items must then be programmed into the SCADA system. The existing hydro service (and electrical capability within the plant) is very near its maximum capability and should be addressed in the 2016 year to continue to allow for large Perth Water Treatment Plant Summary Report 2016 Page 13

14 consumption items such as filter blower and Residue management phase 2 equipment Water Taking Ability The WTP is operating well within the PTTW limits. The Permit To Take Water (#5464-6MHL84) authorizes the municipality to take water with maximum volumes regulated for both litres/min as well as litres per day. This Permit was renewed in the 2016 year and wil expire again in Raw Water pump capacities determine these figures (6,360 l/min and 9,092,000 l/day). In 2016, the maximum day total was 5,396,000 litres, which occurred during a four day stretch of vigorous spring flushing of the distribution network. More typical day averages are around 2,800,000 litres per day. This represents about 2/3 of the water plants rated capacity. Staff routinely inspects the inlet at the golf course for debris, blockages or structural damage. The 24 inlet isolation valve, located at the rear of the plant was replaced in This valve had been a necessary repair for a few years. It was installed by ODS Marine and equipped with a floor level actuator that will allow operators to close and protect the plant, in case of a contaminated raw water supply Water Storage Ability The clear well and reservoir were cleaned and inspected in While on site, the contracted dive crew also pressure washed and inspected the underwater valve network to establish more information and potential pricing for replacing these valves. Initial work was started to replace one of these valves, however, following an accidental contamination of the reservoir, the project has been delayed to allow for further process evaluation. The elevated tank had an inspection completed in October of 2016, with proposals being given for tank level monitoring upgrades. Regular maintenance and emergency repairs occurred within the distribution system including mains, services and hydrants Water Treatment and Distribution Personnel The WTP is a Class III facility and is staffed 16 hours a day, from Monday to Friday, and Saturday/Sunday shifts are 12 hrs. Shifts and duties are rotated amongst three full time operators and a Lead Hand, who covers shifts during times of vacation, illness or absenteeism. The Lead Hand has WTP Level II license, one shift operator has a level II licence and two operators have a level III licence. The Distribution system is a Class 1 facility and is maintained by a Lead Hand and four operators, who rotate through other departments within the organization. The Lead Hand possesses a level III license in distribution and supply. All four operators have level II licenses. Perth Water Treatment Plant Summary Report 2016 Page 14

15 18 January 2016 Graham Patterson Lead Hand WT and WWT Perth Water Treatment Plant Summary Report 2016 Page 15

16 Table 1 Summary of Flows January 1, 2016 to December 31, 2016 Perth Water Treatment Plant PTTW maximum allowable flow rate: 9,090 m 3 / day Raw water (m 3 ) Discharge (Service) Water (m 3 ) Month Monthly Daily Average Flow Monthly Total Flow Monthly Daily Average Flow Monthly Total Flow January 2,655 82,296 2,502 77,560 February 2,729 79,137 2,571 74,545 March 2,853 88,438 2,455 76,091 April 2,849 85,467 2,471 74,132 May 3,044 94,369 2,931 90,871 June 3,093 92,781 2,996 89,874 July 2,988 92,640 2,954 91,585 August 3,086 95,651 3,024 93,752 September 2,757 82,717 2,694 80,829 October 2,729 84,595 2,603 80,697 November 2,553 76,598 2,372 71,141 December 2,473 76,677 2,300 71,306 Year Average Year Total 2,817 85,947 2,656 81,032 1,031, ,383 Perth Water Treatment Plant Summary Report 2016 Page 16

17 Table 2 Historical Average Daily Service Water Flow (m³) Perth Water Treatment Plant JAN. 2,502 2,872 3,211 2,795 2,521, FEB. 2,571 3,290 2,980 3,504 2,708 MARCH 2,455 3,298 3,053 3,664 2,741 APRIL 2,471 3,157 3,247 3,565 2,698 MAY 2,931 3,392 3,003 3,187 3,098 JUNE 2,996 3,002 3,285 2,845 3,109 JULY 2,954 3,048 3,292 3,034 3,441 AUG. 3,024 3,015 3,099 3,076 3,137 SEPT. 2,694 2,979 2,992 2,839 2,962 OCT. 2,603 2,998 2,901 2,894 2,839 NOV. 2,372 2,852 2,693 2,916 2,658 DEC. 2,300 2,784 2,642 3,134 2,578 MAXIMUM 3,024 3,392 3,292 3,644 2,917 MINIMUM 2,300 2,784 2,642 2,795 2,155 AVERAGE 2,656 3,057 3,033 3,119 2,892 Perth Water Treatment Plant Summary Report 2016 Page 17

18 Table Raw Water Taking Perth Water Treatment Plant - Appendix Day January February March April May June July August September October November December 1 2,149,000 3,074,000 2,757,000 2,531,000 2,512,000 3,471,000 2,432,000 3,157,000 3,040,000 2,251,000 2,496,000 2,650, ,179,000 2,741,000 2,695,000 2,011,000 4,683,000 2,816,000 2,182,000 3,180,000 2,899,000 2,450,000 3,289,000 2,596, ,101,000 2,929,000 3,168,000 2,839,000 5,396,000 3,279,000 2,308,000 3,684,000 2,389,000 2,776,000 2,297,000 2,342, ,785,000 2,764,000 2,416,000 3,237,000 4,222,000 2,781,000 3,404,000 3,868,000 2,584,000 2,655,000 2,736,000 2,284, ,501,000 3,260,000 2,839,000 2,436,000 3,298,000 2,102,000 3,024,000 3,432,000 3,009,000 2,603,000 2,284,000 2,805, ,543,000 2,700,000 3,284,000 2,496,000 2,858,000 3,056,000 3,642,000 2,395,000 2,881,000 2,535,000 2,297,000 2,552, ,624,000 2,653,000 2,983,000 2,720,000 2,178,000 3,078,000 2,911,000 2,536,000 3,083,000 2,498,000 2,831,000 2,531, ,158,000 2,798,000 3,455,000 2,716,000 2,162,000 2,656,000 4,061,000 3,624,000 2,579,000 2,248,000 2,722,000 2,598, ,074,000 2,746,000 3,034,000 2,112,000 2,817,000 2,702,000 2,587,000 3,696,000 3,258,000 2,243,000 2,787,000 2,469, ,303,000 2,950,000 3,294,000 2,480,000 2,547,000 3,032,000 2,461,000 3,429,000 2,501,000 2,666,000 2,054,000 2,216, ,626,000 2,765,000 3,519,000 2,584,000 2,821,000 2,177,000 3,241,000 3,578,000 2,559,000 4,184,000 2,586,000 2,263, ,919,000 3,047,000 5,231,000 3,074,000 2,662,000 2,197,000 3,542,000 3,473,000 3,111,000 4,155,000 2,248,000 3,650, ,580,000 2,530,000 2,813,000 3,590,000 2,793,000 2,962,000 3,560,000 2,348,000 2,734,000 4,201,000 2,373,000 2,320, ,758,000 2,542,000 3,265,000 2,947,000 1,878,000 2,900,000 3,083,000 2,352,000 2,681,000 3,581,000 3,063,000 2,818, ,939,000 2,768,000 3,012,000 2,556,000 2,416,000 3,187,000 3,118,000 3,460,000 2,654,000 2,395,000 2,300,000 2,415, ,726,000 2,311,000 2,573,000 2,554,000 2,173,000 3,932,000 2,532,000 3,286,000 2,829,000 2,400,000 2,633,000 2,675, ,401,000 2,592,000 2,782,000 2,623,000 2,949,000 3,444,000 2,569,000 3,360,000 2,509,000 2,373,000 2,841,000 2,375, ,623,000 2,741,000 2,525,000 2,949,000 3,189,000 2,940,000 3,066,000 2,681,000 2,414,000 2,198,000 2,630,000 2,271, ,953,000 3,292,000 2,306,000 3,751,000 2,775,000 3,020,000 3,258,000 3,022,000 2,949,000 2,837,000 2,121,000 2,692, ,632,000 2,534,000 2,252,000 3,675,000 3,464,000 3,844,000 3,044,000 2,788,000 2,891,000 3,143,000 2,227,000 2,648, ,862,000 2,167,000 2,475,000 3,595,000 2,443,000 3,435,000 3,200,000 2,500,000 2,891,000 2,761,000 2,588,000 2,383, ,171,000 2,776,000 3,234,000 3,363,000 2,603,000 3,882,000 3,262,000 3,059,000 3,090,000 2,272,000 2,558,000 2,466, ,562,000 2,778,000 2,452,000 2,697,000 2,959,000 3,418,000 2,825,000 3,031,000 2,675,000 2,551,000 2,536,000 2,313, ,430,000 2,412,000 2,651,000 2,905,000 3,597,000 3,510,000 2,893,000 2,890,000 2,440,000 2,882,000 2,630,000 2,690, ,040,000 2,479,000 2,236,000 3,285,000 3,525,000 3,241,000 2,853,000 3,136,000 2,230,000 2,678,000 3,026,000 1,930, ,835,000 2,966,000 2,160,000 3,119,000 3,082,000 3,056,000 3,124,000 3,211,000 2,689,000 2,570,000 2,119,000 2,285, ,719,000 2,622,000 2,196,000 2,709,000 3,128,000 2,943,000 3,011,000 2,753,000 2,841,000 2,444,000 2,341,000 2,299, ,849,000 2,392,000 2,753,000 3,024,000 3,494,000 3,369,000 2,957,000 2,527,000 3,062,000 2,447,000 2,863,000 2,316, ,183,000 2,808,000 2,476,000 2,620,000 2,942,000 2,979,000 3,049,000 3,274,000 2,569,000 2,391,000 2,481,000 2,234, ,487,000 2,971,000 2,269,000 3,519,000 3,372,000 2,755,000 3,100,000 2,676,000 2,305,000 2,641,000 2,359, ,584,000 2,631,000 3,284,000 2,686,000 2,821,000 2,902,000 2,232,000 Minimum 2,074,000 2,167,000 2,160,000 2,011,000 1,878,000 2,102,000 2,182,000 2,348,000 2,230,000 2,198,000 2,054,000 1,930,000 Maximum 3,183,000 3,292,000 5,231,000 3,751,000 5,396,000 3,932,000 4,061,000 3,868,000 3,258,000 4,201,000 3,289,000 3,650,000 Average 2,654,710 2,728,862 2,852,839 2,848,900 3,044,161 3,092,700 2,988,387 3,085,516 2,757,233 2,728,871 2,553,267 2,473,452 Monthly total 82,296,000 79,137,000 88,438,000 85,467,000 94,369,000 92,781,000 92,640,000 95,651,000 82,717,000 84,595,000 76,598,000 76,677,000 Running Year total 82,296, ,433, ,871, ,338, ,707, ,488, ,128, ,779, ,496, ,091, ,689,000 1,031,366,000 Perth Water Treatment Plant Summary Report 2016 Page 18

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