ANNUAL DRINKING WATER SYSTEM SUMMARY REPORT Tillsonburg Water System

Transcription

1 ANNUAL DRINKING WATER SYSTEM SUMMARY REPORT Tillsonburg Water System 1. GENERAL INFORMATION This report is intended to fulfill the requirements of Ontario Regulation 170/03 Section 11.(1) and Schedule 22. A copy is available on the internet by the end of February each year at or by requesting a copy from the Public Works Department. All efforts have been made to ensure the information presented in this report is as accurate as is possible. If you have any questions or comments concerning the report please contact the County of Oxford at the address and phone number listed below or by at ltruscott@oxfordcounty.ca. Drinking Water System: Drinking Water System Number: Drinking Water System Owner & Contact Information: Tillsonburg Water System Oxford County Public Works Department Water Services P.O. Box Reeve Street Woodstock, ON N4S 7Y3 Telephone: Toll Free: Reporting Period: January 1, 2011 December 31, System Description The Tillsonburg Water System is a Large Municipal Water system as defined by Regulation 170/03 and serves a population of approximately 16,340. There are six treatment facilities located in and around Tillsonburg. Each facility treats water from one to three wells on site. The facilities house high lift pumps, monitoring and treatment equipment and standby power. The treatment for each site is summarized below. Water storage is provided by a 9,100 m 3 reservoir. Mall Road Water Treatment Plant (WTF) Wells 1A and 2 have treatment with filtration and disinfection with UV and chlorine gas. Fairview WTF Wells 4 and 5 have disinfection treatment with chlorine gas at the well house then UV and sodium hypochlorite at Fairview. Plank Line WTF Well 6A has disinfection treatment with chlorine gas. Broadway Street WTF Well 7 has disinfection treatment with sodium hypochlorite and iron sequestering using sodium silicate. It was not in service in Bell Mill Road WTF Wells 9, 10 & 11 have treatment with filtration and disinfection with UV and chlorine gas. Rokeby Road WTF Well 12 has disinfection treatment with chlorine gas. In 2011, approximately 5,032 kg of chlorine gas and 4.1 m 3 of sodium hypochlorite were used in the water treatment process. The chemicals are certified to meet standards set by the Standards Council of Canada or American National Standards Institution.

2 Treated water is continuously monitored for free chlorine residual and turbidity. The system is maintained by licensed water system operators, who operate treatment and monitoring equipment and collect samples as specified by the Regulation. Microbiological and chemical tests are analyzed at certified laboratories. Alarms notify a qualified operator in the event of failure of critical operational requirements Major Expenses A well pump was replaced in Well 2. Design work for upgrades to the reservoir was completed. Other expenses incurred were for normal operation and maintenance of the system. 2. MICROBIOLOGICAL TESTING 2.1. E. coli and Total Coliform Bacteriological tests for E. coli and total coliforms are required weekly on the raw and treated water at the facility. Any E. coli or total coliform results above 0 in treated water are reported to the Ministry of Environment and Board of Health. Resamples and any other required actions are taken as quickly as possible. The results from the 2010 sampling program are shown on the table below. There was one adverse test result from 576 treated water samples in this reporting period. Number of Samples Range of E. coli Results Min - Max MAC = 0 Range of Total Coliform Results Min - Max MAC = 0 Raw Treated Distribution Heterotrophic Plate Count (HPC) HPC analyses are required from the treated and distribution water. The tests are required weekly for treated water and for 25 % of the distribution system samples. HPC should be less than 500 colonies per 1 ml. Results over 500 colonies per 1 ml may indicate a change in water quality but it is not considered an indictor of unsafe water. Number of Samples Range of HPC Min - Max Treated >500 Distribution CHEMICAL TESTING Results for inorganic and organic chemical parameters listed in Schedules 23 and 24 of Reg. 170/03 are provided in Appendix A. The sampling frequency varies for different types and sizes of water systems. If the concentration of a parameter is above half of the Maximum Allowable Concentration (MAC) under the Ontario Drinking Water Quality Standards, an increased testing frequency of once every three months is required by the Regulation. Where concerns regarding a parameter exist, the Ministry of the Environment can also require additional sampling be undertaken. No additional testing is required for the Tillsonburg Water System. Information on the health effects and allowable limits of components in drinking water may be found on the Ministry of Environment web page through the link provided in Appendix A. Additional information on common chemical parameters specific to the Tillsonburg system is provided below.

3 3.1. Sodium Sodium levels up to 200 mg/l are acceptable for consumption. Sodium above 20 mg/l must be reported once every five years. The required action is to resample for confirmation and notification to the MOE and Medical Offer of Health (MOH). The MOH provides information on exceedences to local Health Care Providers. The sodium levels in the Tillsonburg system range from 2.57 to 83.1 mg/l depending on the wells in use Lead In 2007 the requirements for lead testing in distribution systems and plumbing that serves customers was changed. Sampling is required between December 15 to April 15 and June 15 to October 15 each year. If repeated testing indicates low levels of lead are present then the municipality may first reduce then discontinue sampling from private plumbing. The reduced sampling schedule has been initiated for the Tillsonburg Water System. Residential samples will be collected in Hardness This is an aesthetic parameter that may affect the appearance of the water but is not related to health. Well water commonly has high levels of hardness and other minerals from being in contact with underground rock formations. Many households have water softeners to help reduce white calcium deposits and improve the efficiency of soaps. This information is included here to help set the water softener at the level recommended by the manufacturer. Hardness ranges from 84 to 360 mg/l (equivalent to 6-25 grains) depending on the wells in use. 4. OPERATIONAL MONITORING 4.1. Chlorine Residual Free chlorine levels of the treated water are monitored continuously at the discharge point of the Water Treatment Facilities. In the distribution system, free chlorine is monitored continuously. As a target, free chlorine residual within the distribution system should be above 0.20 mg/l. A free chlorine level lower than 0.05 mg/l must be reported and corrective action taken. There were no reportable incidents in A summary of the chlorine residual readings is provided in the table below Turbidity Turbidity of treated water is continuously monitored at the treatment facility. A change in turbidity can indicate an operational problem. The turbidity of untreated water from each well is checked monthly. Turbidity is measured in nephelometric turbidity units (NTU). Under Regulation 170/03 turbidity in groundwater is not reportable however turbidity should be < 1 NTU at the treatment plant and < 5 NTU in the distribution system. A summary of the monitoring results for 2011 is below. Number of Range of Results Parameter and Location Samples or Tests (Min Max) and Average Chlorine Residual in Distribution mg/l Continuously Monitored ( ) 1.02 Bell Mill Road WTF Chlorine mg/l ( ) 1.21 Turbidity NTU ( ) 0.06 Fairview WTF/North St W. Chlorine mg/l ( ) 1.28 Turbidity NTU ( ) 0.03

4 Table continued Parameter and Location Mall Road WTF Plank Line WTF Rokeby Road WTF Number of Samples or Tests Range of Results (Min Max) and Average Chlorine mg/l Continuously Monitored ( ) 1.28 Turbidity NTU ( ) 0.05 Chlorine mg/l ( ) 1.34 Turbidity NTU ( ) 0.08 Chlorine mg/l ( ) 1.14 Turbidity NTU ( ) Distribution and Supply Well Flow Rates Continuous monitoring of flow rates from supply wells into the treatment system and from the facility into the distribution system is required by Regulation 170/03. The Municipal Drinking Water License and Permit to Take Water limit the amount of water that can be utilized over a given time period. A summary of the 2011 flows is provided in Appendix B Ultra Violet (UV) Disinfection Supply wells that have been classified as being GUDI with effective in-situ filtration require enhanced disinfection through ultra violet (UV) irradiation. A minimum UV dosage of 40 mj/cm 2 is maintained to inactivate any microorganisms that may be present from contact with surface water. Water is treated with chlorine after UV to maintain a disinfectant residual as it proceeds to the distribution system. Insufficient dosage of UV must be reported as Inadequate Disinfection even when the chlorine residual is acceptable. There were no occurrences of inadequate UV disinfection in this reporting period. 5. NON-COMPLIANCE FINDINGS AND ADVERSE RESULTS This section documents any known incidents of non-compliance or adverse results and the associated correction actions taken to resolve the issue. Non-compliance issues are typically identified by either the Operating Authority or the Ministry of the Environment Drinking Water Inspectors. The issues and associated required actions are documented by the Inspectors in the system s Annual Inspection Report. Adverse results are identified and subsequently reported by the Operating Authority with corrective actions followed up on by the Inspectors Non-Compliance Findings The MOE Inspection Rating for the Tillsonburg Water System for 2011 was 98.5%. There was one noncompliance issues identified. The reservoir hatch at Mall Road was not properly sealed and secured. This issue has been resolved and a schedule for inspection is in place to prevent a reoccurrence Adverse Results Any adverse results from bacteriological, chemical samples or observations of operational conditions that indicate adverse water quality are reported as required and corrective actions taken. Below is a summary of the adverse/reportable occurrences for 2011 along with the corresponding resolution. Incident /Date Corrective Action Resolution/Date Reported and resamples taken. June 15/11, 1 Total coliform in a distribution sample. June 17/11 Resample results were acceptable.

5 APPENDIX A: SUMMARY OF CHEMICAL RESULTS UNDERSTANDING CHEMICAL TEST RESULTS The following tables summarize the laboratory results of the chemical testing Oxford County is required to complete. Different types of parameters are required to be tested for at different frequencies as noted below. Explanations on the health impacts of these parameters can be found at the MOE web site document # 4449e01 titled Technical Support Document for Ontario Drinking Water Standards, Objectives and Guidelines. Results are shown as concentrations with units of either milligrams per litre (mg/l) or micrograms per litre (ug/l). 1 mg/l is equal to 1000 ug/l. The Maximum Acceptable Concentration (MAC) is the highest amount of a parameter that the MOE finds acceptable in Municipal drinking water and can be found in the MOE Drinking Water Standards. The Method Detection Limit (MDL) is the lowest amount to which the laboratory can confidently measure. A result of ND stands for Not Detected and means that the concentration of the chemical is lower than the laboratory s equipment is capable of measuring. Nitrate and nitrate samples are required every 3 months in normal operation. Parameter & Location Result Range Average Result MAC (mg/l) MDL (mg/l) Min Max (mg/l) (mg/l) Nitrite Bell Mill Rd WTF ND ND Fairview WTF ND ND Mall Road WTF ND ND Plank Line WTF ND ND Rokeby Road WTF ND ND Nitrate Bell Mill Rd WTF Fairview WTF Mall Road WTF Plank Line WTF ND <0.013 Rokeby Road WTF A Trihalomethane (THM) sample is required every 3 months from the distribution system. THM is a byproduct of the disinfection process. Parameter Annual Average Result Value (ug/l) MAC (ug/l) MDL (ug/l) Trihalomethane (THM) The following Tables summarize the most recent test results for Schedule 23. Testing is required annually for GUDI wells and every 3 years for Non GUDI wells. Parameter Bell Mill Rd Dec 6/11 Fairview WTF Dec 6/11 Mall Rd WTF Dec 6/11 MAC (ug/l) MDL (ug/l) Antimony ND ND Arsenic Barium Boron Cadmium ND Chromium Mercury ND ND ND Selenium ND ND ND 10 1 Uranium

6 Parameter Plank Line May 26/10 Rokeby Rd May 26/10 MAC (ug/l) MDL (ug/l) Antimony ND Arsenic Barium Boron Cadmium ND ND Chromium Mercury ND ND Selenium ND ND 10 1 Uranium The following Table summarizes the most recent test results for Sodium and Fluoride. Testing and reporting any adverse results is required every 5 years. Parameter & Location Sample Date Result Value (mg/l) MAC (mg/l) MDL (mg/l) Sodium 20.0* 0.01 Bell Mill Rd WTF Sept 30/ Fairview WTF June 29/ Mall Road WTF Sept 30/ Plank Line WTF 42.1 Rokeby Road WTF 2.42 Fluoride 1.5** 0.06 Bell Mill Rd WTF Sept 30/ Fairview WTF June 15/ Mall Road WTF Sept 30/11 ND Plank Line WTF 1.30 Rokeby Road WTF ND *Sodium levels between mg/l must be reported every 5 years. **Natural levels of fluoride between mg/l must be reported every 5 years. Summary of Organic parameters in Schedule 24 sampled during this reporting period or the most recent sample results. Testing is required annually for GUDI wells and every 3 years for Non GUDI wells. Results Results Results (ug/l) (ug/l) (ug/l) MAC Parameter Bell Mill Rd Fairview Mall Road (ug/l) Dec 6/11 Dec 6/11 Dec 6/11 MDL (ug/l) Alachlor ND ND ND Aldicarb ND ND ND Aldrin + Dieldrin ND ND ND Atrazine + N-dealkylated metobolites ND Azinphos-methyl ND ND ND Bendiocarb ND ND ND Benzene ND ND ND Benzo(a)pyrene ND ND ND Bromoxynil ND ND ND Carbaryl ND ND ND Carbofuran ND ND ND Carbon Tetrachloride ND ND ND

7 Table continued Parameter Results (ug/l) Bell Mill Rd Dec 13/10 Results (ug/l) Fairview Dec 13/10 Results (ug/l) Mall Road Dec 13/10 MAC (ug/l) MDL (ug/l) Chlordane (Total) ND ND ND Chlorpyrifos ND ND ND Cyanazine ND ND ND Diazinon ND ND ND Dicamba ND ND ND ,2-Dichlorobenzene ND ND ND ,4-Dichlorobenzene ND ND ND Dichlorodiphenyltrichloroethane (DDT) + ND ND ND metabolites 1,2-Dichloroethane ND ND ND ,1-Dichloroethylene (vinylidene chloride) ND ND ND Dichloromethane ND ND ND Dichlorophenol ND ND ND ,4-Dichlorophenoxy acetic acid (2,4-D) ND ND ND Diclofop-methyl ND ND ND Dimethoate ND ND ND Dinoseb ND ND ND Diquat ND ND ND 70 1 Diuron ND ND ND Glyphosate ND ND ND Heptachlor + Heptachlor Epoxide ND ND ND Lindane (Total) ND ND ND Malathion ND ND ND Methoxychlor ND ND ND Metolachlor ND ND ND Metribuzin ND ND ND Monochlorobenzene ND ND ND Paraquat ND ND ND 10 1 Parathion ND ND ND Pentachlorophenol ND ND ND Phorate ND ND ND Picloram ND ND ND Polychlorinated Biphenyls(PCB) ND ND ND Prometryne ND ND ND Simazine ND ND ND Temephos ND ND ND Terbufos ND ND ND Tetrachloroethylene ND ND ND ,3,4,6-Tetrachlorophenol ND ND ND Triallate ND ND ND Trichloroethylene ND ND ND ,4,6-Trichlorophenol ND ND ND ,4,5-Trichlorophenoxy acetic acid (2,4,5-T) ND ND ND Trifluralin ND ND ND Vinyl Chloride ND ND ND

8 Parameter Plank Line July 27/09 Rokeby Rd June 15/09 MAC (ug/l) MDL (ug/l) Alachlor ND ND Aldicarb ND ND Aldrin + Dieldrin ND ND Atrazine + N-dealkylated metobolites ND ND Azinphos-methyl ND ND Bendiocarb ND ND Benzene ND ND Benzo(a)pyrene ND ND Bromoxynil ND ND Carbaryl ND ND Carbofuran ND ND Carbon Tetrachloride ND ND Chlordane (Total) ND ND Chlorpyrifos ND ND Cyanazine ND ND Diazinon ND ND Dicamba ND ND ,2-Dichlorobenzene ND ND ,4-Dichlorobenzene ND ND Dichlorodiphenyltrichloroethane (DDT) + ND ND metabolites 1,2-Dichloroethane ND ND ,1-Dichloroethylene (vinylidene chloride) ND ND Dichloromethane ND ND Dichlorophenol ND ND ,4-Dichlorophenoxy acetic acid (2,4-D) ND ND Diclofop-methyl ND ND Dimethoate ND ND Dinoseb ND ND Diquat ND ND 70 1 Diuron ND ND Glyphosate ND ND Heptachlor + Heptachlor Epoxide ND ND Lindane (Total) ND ND Malathion ND ND Methoxychlor ND ND Metolachlor ND ND Metribuzin ND ND Monochlorobenzene ND ND Paraquat ND ND 10 1 Parathion ND ND Pentachlorophenol ND ND Phorate ND ND Picloram ND ND Polychlorinated Biphenyls(PCB) ND ND Prometryne ND ND Simazine ND ND Temephos ND ND Terbufos ND ND Tetrachloroethylene ND ND ,3,4,6-Tetrachlorophenol ND ND Triallate ND ND

9 Parameter Plank Line July 27/09 Rokeby Rd June 15/09 MAC (ug/l) MDL (ug/l) Trichloroethylene ND ND ,4,6-Trichlorophenol ND ND ,4,5-Trichlorophenoxy acetic acid (2,4,5-T) ND ND Trifluralin ND ND Vinyl Chloride ND ND

10 APPENDIX B COUNTY OF OXFORD 2011 SUMMARY Page 1 of 5 WATER SYSTEM: TILLSONBURG MALL ROAD WATER TREATMENT FACILITY (Wells 1A & 2) 2011 MONTHLY AVERAGE DAILY MAXIMUM TREATMENT DISTRIBUTION WELL 1A WELL 2 MONTH FLOW FLOW DAY FLOW FLOWRATE FLOWRATE FLOW FLOW m3 m3 m3 L/s L/s m3 m3 JANUARY 40,207 1,297 2, ,595 8,129 FEBRUARY 47,211 1,686 2, ,409 0 MARCH 36,157 1,166 1, ,706 0 APRIL 21, , ,554 0 MAY 21, , ,311 3,910 JUNE 43,575 1,453 2, ,237 14,281 JULY 55,450 1,789 2, ,874 17,915 AUGUST 51,627 1,665 2, ,874 15,512 SEPTEMBER 48,966 1,632 2, ,985 15,350 OCTOBER 46,323 1,494 2, ,171 15,331 NOVEMBER 41,786 1,393 1, ,644 13,118 DECEMBER 41,287 1,332 1, ,089 12,915 TOTAL 495, , ,461 SUMMARY Drinking Water License Limit (m3/d) 3,600 Permit to Take Water Limit (m3/d) 2,290 1,310 Average Day Flow (m3) 1,356 Average Day Flow (m3) 1, Maximum Day Flow (m3) 2,480 Maximum Day Flow (m3) 1, MDWLCapacity Used 69% PTTW Capacity Used 83% 62% Last revised on

11 COUNTY OF OXFORD 2011 SUMMARY Page 2 of 5 WATER SYSTEM: TILLSONBURG FAIRVIEW BOOSTER STATION FLOWS (Wells 4 & 5) 2011 TOTAL MONTHLY AVERAGE DAILY MAXIMUM TREATMENT DISTRIBUTION WELL 4 WELL 5 MONTH FLOW FLOW DAY FLOW FLOWRATE FLOWRATE FLOW FLOW m3 m3 m3 L/s L/s m3 m3 JANUARY 20, , ,296 7,505 FEBRUARY 22, , ,623 7,811 MARCH 18, , ,374 6,220 APRIL 85,876 2,863 4, ,770 30,263 MAY 97,727 3,152 3, ,764 36,020 JUNE 85,053 2,835 3, ,264 30,196 JULY 82,119 2,649 3, ,730 29,927 AUGUST 72,607 2,342 3, ,357 25,546 SEPTEMBER 56,896 1,897 2, ,159 22,114 OCTOBER 54,993 1,774 2, ,221 19,782 NOVEMBER 52,171 1,739 2, ,154 18,222 DECEMBER 58,296 1,881 2, ,768 22,435 TOTAL 707, , ,041 SUMMARY Drinking Water License Limit (m3/d) 6,307 Permit to Take Water Limit (m3/d) 2,995 2,002 Average Day Flow (m3) 1,940 Average Day Flow (m3) 31,957 21,337 Maximum Day Flow (m3) 4,034 Maximum Day Flow (m3) 2,224 1,547 MDWLCapacity Used 81% PTTW Capacity Used 45% 31% Last revised on

12 COUNTY OF OXFORD 2011 SUMMARY Page 3 of 5 WATER SYSTEM: TILLSONBURG BELL MILL SIDEROAD PUMPHOUSE FLOWS (Wells 9,10 &11) 2011 TOTAL MONTHLY AVERAGE DAILY MAXIMUM TREATMENT DISTRIBUTION WELL 9 WELL 10 WELL 11 MONTH FLOW FLOW DAY FLOW FLOWRATE FLOWRATE FLOW FLOW FLOW m3 m3 m3 L/s L/s m3 m3 m3 JANUARY 79,558 2,566 3, ,606 29,848 22,307 FEBRUARY 72,548 2,591 2, ,295 24,847 22,160 MARCH 88,606 2,858 2, ,434 31,333 29,866 APRIL 32,985 1,100 2, ,134 18,102 8,604 MAY 37,297 1,203 1, ,130 13,902 11,786 JUNE 45,313 1,510 2, ,869 15,645 14,011 JULY 55,746 1,798 2, ,741 19,987 18,030 AUGUST 48,274 1,557 2, ,628 21,319 13,322 SEPTEMBER 38,734 1,291 2, ,778 14,054 13,145 OCTOBER 45,052 1,502 2, ,347 16,234 14,770 NOVEMBER 41,252 1,422 1, ,767 16,552 13,547 DECEMBER 40,361 1,302 1, ,650 16,429 14,117 TOTAL 625, , , ,665 SUMMARY Drinking Water License Limit (m3/d) 3,931 Permit to Take Water Limit (m3/d) 1,310 1,310 1,310 Average Day Flow (m3) 1,714 Average Day Flow (m3) Maximum Day Flow (m3) 3,048 Maximum Day Flow (m3) 1,198 1,204 1,133 MDWLCapacity Used 78% PTTW Capacity Used 91% 92% 86% Last revised on

13 COUNTY OF OXFORD 2011 SUMMARY Page 4 of 5 WATER SYSTEM: TILLSONBURG PLANK LINE PUMPHOUSE FLOWS (Well 6A) 2011 TOTAL MONTHLY AVERAGE MAXIMUM MAXIMUM WELL 6A MONTH FLOW FLOW DAY FLOW FLOWRATE FLOW m3 m3 m3 L/s m3 JANUARY 7, ,780 FEBRUARY 6, ,275 MARCH 7, ,240 APRIL 6, ,647 MAY 6, ,329 JUNE 7, ,124 JULY 7, ,633 AUGUST 5, ,289 SEPTEMBER 5, ,612 OCTOBER 5, ,860 NOVEMBER 4, ,346 DECEMBER 4, ,690 TOTAL 74,825 74,825 SUMMARY Drinking Water Licence Limit (m3/d) 982 Permit to Take Water Limit (m3/d) 1,310 Average Day Flow (m3) 205 Average Day Flow (m3) 205 Maximum Day Flow (m3) 434 Maximum Day Flow (m3) 434 MDWL Capacity Used 44% PTTW Capacity Used 33% Last revised on

14 COUNTY OF OXFORD 2011 SUMMARY Page 5 of 5 WATER SYSTEM: TILLSONBURG ROKEBY ROAD PUMPHOUSE FLOWS (Well 12) 2011 TOTAL MONTHLY AVERAGE DAILY MAXIMUM MAXIMUM WELL 12 MONTH FLOW FLOW DAY FLOW FLOWRATE FLOW m3 m3 m3 L/s m3 JANUARY 8, ,169 FEBRUARY 8, , ,824 MARCH 6, ,302 APRIL 5, ,947 MAY 2, ,730 JUNE 2, ,916 JULY 12, , ,613 AUGUST 5, ,337 SEPTEMBER 6, ,901 OCTOBER 2, ,748 NOVEMBER 2, ,995 DECEMBER 2, ,482 TOTAL 67,964 67,964 SUMMARY Drinking Water License Limit ( m3/d) 1,310 Permit to T ake Water Limit (m3/d) 1,310 Average Day Flow ( m3) 186 Average Day Flow (m3) 186 Maximum Day Flow ( m3) 1,076 Maximum Day Flow (m3) 1,076 MDWLCapacity Used 82% PTTW Capacity Used 82% Last revised on 10212