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Tillsonburg Water System

Tillsonburg Water System. Outline. Vance Wells And Regulatory Timeline Engineer’s Report Conclusions & Recommendations GUDI “Groundwater Under the Direct Influence” of Surface Water Conclusions & Recommendations Class Environmental Assessment Outside Water Use Background LWRP

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Tillsonburg Water System

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  1. Tillsonburg Water System

  2. Outline • Vance Wells And Regulatory Timeline • Engineer’s Report Conclusions & Recommendations • GUDI “Groundwater Under the Direct Influence” of Surface Water Conclusions & Recommendations • Class Environmental Assessment • Outside Water Use • Background • LWRP • Pilot Program

  3. Vance Wells: Timeline • 1995 • The PUC completes an EA recommending the Vance wells be brought online by 1997 • March 2000 • The Vance Wells are constructed by the County • May 2000 • The E-coli outbreak in Walkerton • August 2000 • Ontario Regulation 459 in-acted requiring substantial upgrades to municipal water system including Engineers Reports • May 2001 • Submission of Tillsonburg’s Engineer’s Report

  4. Vance Wells: Timeline • November 2001 • MOE posts requirements for GUDI assessment of Wells • May 2002 • MOE issues Tillsonburg Water System consolidated CofA • September 2002 • Completion of Tillsonburg GUDI assessment of online wells • January 2003 • County undertakes Class EA Consultant selection and Vance Well GUDI assessment

  5. 2001 Engineer’s ReportRecommendations Relating to the Potential for Microbial Contamination • Overall • Ensure that all sampling, monitoring and reporting is completed to comply with Regulation 459/00 • Distribution System • Ensure that all sampling, monitoring and reporting outlined in Regulation 459/00 is completed. Specifically that the correct number of treated water samples are collected for the distribution system on a monthly basis • Increase the chlorine dose to ensure that the free chlorine residual in the distribution system does not drop below 0.20 mg/L • Ensure that operations staff follow procedures outlined in the ODWS when there is adverse water quality

  6. Recommendations Relating to Physical Works • Well and Pumphouse • Ensure that the openings in the pump housings for Well 1A and Well 2 are sealed to prevent entry of foreign material • Provide plug for threaded openings in the top of both well casings for times when well level monitoring is not being performed (PH1, PH2, PH4, PH5,PH6) • Remove the old threaded sampling taps (PH1, PH2, PH5) • Install screen on blow off piping from Well 1A control building (PH1) • Install a treated water flow meter in high lift pumphouse (PH1, PH2) • Investigate overflow position from reservoir into overflow tank and install a backflow preventor (PH1) • Install screen on well casing air release valve - Well 6A (PH3) • If Well 6 is not to be used as an observation well, ensure that it is properly abandoned according to Ontario Regulation 903 (PH3) • Remove pump and appurtenances from Well 6 (PH3) • Install screen on air release valve exhaust piping (PH 4, PH 5, PH6)

  7. Recommendations Relating to Physical Works • Well and Pumphouse • Ensure access hatch to reservoir in the lower level of the pumphouse (PH2) • Calibrate flow meters and repeat on an annual basis (PH2, PH3, PH4, PH5, PH6) • Seal the large void around the piping extending into the distribution system (PH2) • Drain, inspect and clean reservoir (PH1, PH2, PH5) • Install smooth nosed sampling taps (PH4) • Regrade around pumphouse so floor is 150 mm above grade (PH4) • Install flapgate on combined blow off piping for wells in main pumphouse • Ensure floor drain is equipped with flapgate • Install backflow preventor on in-plant water supply lines (PH1, PH2, PH3, PH4, PH5, PH6) • Equip reservoir vent with screen (PH5) • Extend casing of observation wells to at least 45 cm above surrounding grade (PH6)

  8. Recommendations Relating to Physical Works • Disinfection • Provide spare parts in pumphouse for disinfection and sequestration system (PH1in Well 1A control building, PH5) • Provide spare parts in pumphouse for disinfection system (PH2, PH3) • Undertake a chlorine contact study to assess alternatives to provide the required effective residence time of 15 minutes and implement the most cost-effective alternative (PH1) • Extend chlorine injector to centre line of pipe (PH3, PH4, PH6) • Seal hole from chlorination room to main pumphouse room (PH3) • Modify injection points so that sodium silicate is immediately downstream of chlorine injection (PH4) • Provide an operational spare sodium silicate pump (PH4)

  9. Recommendations Relating to Physical Works • Disinfection • Ensure chlorine injector discharges to the centre line of piping (PH5) • Provide secondary containment for sodium silicate tanks (PH5) • Calibrate chlorine analyser (PH5) • Ensure that gas chlorination system is appropriately sized (PH5) • Determine if capacity of chlorine injection is adequate (PH6) • Determine where treated water sampling tap is tied into distribution piping (PH6) • Seal void around gas chlorine piping through inside separator wall (PH6)

  10. Conclusions and Recommendations GUDI Study • Wells 1A & 2 • are GUDI • awaiting results of filtration assessment • treatment at a minimum is enhanced disinfection (i.e. UV) • Wells 4 & 5 • are GUDI but have adequate in-situ filtration • treatment requires enhanced disinfection (i.e. UV) and treatment or operational control for Nitrate reduction • Wells 6 • not GUDI • treatment requires a minimum of 15 min Chlorine contact time • Wells 7 • are GUDI with adequate in-situ filtration • treatment requires enhanced disinfection (i.e. UV)

  11. Conclusions and Recommendations GUDI Study • Wells 9 & 10 • are GUDI with adequate in-situ filtration • treatment requires enhanced disinfection (i.e. UV) • Wells 11 & 12 • not GUDI • treatment requires a minimum of 15 min Chlorine contact time • Wells 13 & 14 (Vance) • are GUDI with adequate in-situ filtration • treatment requires enhanced disinfection (i.e. UV) Additional treatment for iron and manganese removal will likely be required at Wells 1A, 2, 4, 5, 9, 10, 12 and Vance

  12. Class EA Timeline • Project Initiation- March 2003 • First Public Meeting -April 10th,7:30 p.m., Tillsonburg Library • introduce project and alternative solutions • Second Public Meeting- end of May or June • present alternative designs & recommended solution • Third Public Meeting - end of June or July • present preliminary finalization of preferred design • Completion of Environmental Study Report - mid/end of July • begin 30 day review period If no Part II Orders are received, County will begin the process for the final design at the end of the 30 days Final Design: Fall/Winter of 2003 Construction: 2004

  13. Outside Water Use: Previous Years • The Summers of 2001 and 2002 brought serious drought conditions to most of Ontario • Historical records of low water levels in rivers and streams and precipitation were broken in many communities across Southwestern Ontario • Tillsonburg received 21% of the normal rainfall in July of 2001 and 24% in August 2002 • Overall Tillsonburg received about half of the normal summer rainfall • The drought was worse in the southern part of Oxford County resulting in different restriction in different parts of the County

  14. Low Water Response Plan • The plan was developed by the Province in 2000 to address low water conditions in times of drought • It specifies what a drought is, how to quantify it and assess its severity • LWRP uses precipitation and stream flow to determine drought severity and has three levels • LEVEL I: Warning - Voluntary 10% reduction by PTTW holders • LEVEL II: Conservation - Voluntary 20% reduction • LEVEL III: Restrictions - Mandatory 20% reduction • In August 2002 BIG OTTER CREEK reached Level III conditions (although it was not in-acted by the Province) • In November 2002 BIG OTTER CREEK was still in a Level I condition.

  15. Peak Factor *Note: Peak Factor = 2.1 compared to typical municipality of 1.6

  16. Outside Water Use New Pilot Program • Pilot Program to be implemented in Tillsonburg for Summer 2003 • Will use the Provincial LWRP and Tillsonburg’s supply capacity to implement progressive restrictions aimed at minimizing or avoiding a complete watering ban

  17. Outside Water Use New Pilot Program • LEVEL 0: Careful Use - County’s normal watering restrictions from May to September of odd/even days between 6 a.m. - 9 a.m. and 6 p.m. - 9 p.m. • LEVEL I: Conserve - Twice per week watering initiated when Long Point Region Conservation Authority issues a Level I warning or consumption reaches 8000 m3 /day (10-day running average) • LEVEL II: Minimize - Once per week watering initiated when LPRCA issues a Level II or consumption reaches 9000 m3 /day (10-day running average) • LEVEL III: Restrict - Total watering ban initiated when LPRCA issues a Level III or consumption exceeds supply capacity of 12,000 m3 per day

  18. Level 3 Level 2 Level 1

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