Caledon East Water Supply Class Environmental Assessment Schedule B. Public Information Centre May 1, 2007

Transcription

1 Caledon East Water Supply Class Environmental Assessment Schedule B Public Information Centre May 1, 2007

2 Terms and Abbreviations average day demand (ADD) the total volume of water used during the year divided by 365 days (366 days in leap years) L/cap/d litres per capita per day m³/d cubic meters per day (1 cubic metre = 1 m x 1 m x 1 m = 1,000 litres) maximum day demand (MDD) the highest daily water use rate during the year OP Official Plan PTTW Permit to Take Water

3 Need/Rationale The Caledon East/Mono Road community (Caledon East) is serviced by three municipal groundwater wells. The Ministry of the Environment (MOE) Permit to Take Water (PTTW) currently limits the combined average and maximum day water taking. The Region of Peel has initiated a Class Environmental Assessment (Class EA) for the Caledon East water supply to address existing and some future needs In support of the study, a hydrogeological study was undertaken to examine the impact of revising the PTTW In 2006, the Caledon East average day water demand (ADD) was 1,304 m³/d Caledon East average day water demand is projected to be 4,333 m³/d in the year 2021 for an approved population of 8,513. This water demand would exceed the current 1,800 m³/d restriction, as imposed by the current PTTW. The existing system is operating at or near the allowable maximum day demand (= ADD x peaking factor) capacity during certain demand conditions

4 Purpose of Study The purpose of the study is to evaluate groundwater withdrawal from the existing wells (CE2, CE3, and CE4) and to determine the degree to which withdrawal can be increased without detrimental impact on the environment. This study will also review the ability of the existing pump houses to treat increased flows. Note: the evaluation of water sources other than CE2, CE3, and CE4 was not part of the scope of this Class EA. This will be considered in future studies.

5 Municipal Class EA Process PHASE 1 PHASE 2 PHASE 3 PHASE 4 PHASE 5 PROBLEM OR OPPORTUNITY ALTERNATIVE SOLUTIONS Phases 3 and 4 do not apply to a Schedule B Class EA ALTERNATIVE DESIGN CONCEPTS FOR PREFERRED SOLUTION ENVIRONMENTAL STUDY REPORT IMPLEMENTATION 1 Identify Problem or Opportunity 2 Discretionary Public Consultation to Review Problem or Opportunity 1 Identify Alternative Solutions to Problem or Opportunity Select Schedule Approved - May Proceed Schedule A 1 Identify Alternative Design Concepts for Preferred Solution 2 Detail Inventory of Natural, Social, and Economic Environment 1 Complete Environmental Study Report (ESR) 2 Environmental Study Report (ESR) Placed on Public Record 1 Complete Contract Drawings and Tender Document 2 Proceed to Construction and Operation LEGEND * Determine Applicability of Master Plan Approach WE ARE HERE Indicates Possible Events Indicates Mandatory Events Indicates Probable Events Mandatory Public Contact Events Decision Points on Choice of Schedule Optional Part II Order 2 Inventory Natural, Social, Economic Environment 3 Identify Impact of Alternative Solutions on the Environment, and Mitigating Measures 4 Evaluate Alternative Solutions: Identify Recommended Design 5 Consult Review Agencies and Public re: Problem or Opportunity and Alternative Solutions 6 Select Preferred Solution Review and Confirm Choice of Schedule If No Order*, May Proceed Order* Granted Proceed With Individual EA or Abandon Project Opportunity for Order* Request to Minister Within 30 Days of Notification Notice of Completion to Review Agencies and Public Schedule B Schedule C Individual EA 3 Identify Impact of Alternative Designs on Environment, and Mitigating Measures 4 Evaluate Alternative Designs: Identify Recommended Design 5 Consult Review Agencies and Previously Interested and Directly Affected Public 6 Select Preferred Design Review Environmental Significance and Choice of Schedule 7 Preliminary Finalization of Preferred Design Notice of Completion to Review Agencies and Public Copy of Notice of Completion to MOE-EA Branch 3 Opportunity to Request Minister Within 30 Days of Notification Discretionary to Request to Order Public Consultation to Review Preferred Design Optional Formal Mediation Order* Granted, Order* Proceed Denied Matter as per With or Referred Minister's Without to Mediation Direction Minister's or Abandon Conditions Project 3 Monitor for Environmental Provisions and Commitments

6 Caledon East Production Wells

7 Historical and Projected Caledon East Population and Water Demand ( ) Water demand projections are based on the community s Official Plan population projections and the area s development strategy. Industrial, commercial and institutional (ICI) water demands are also included. Population projections are based on the Town of Caledon Official Plan. Water demand projections to year 2021 are based on: Historical residential per capita demand of 434 L/cap/d Historical maximum day demand (MDD) of approximately 2.80 x ADD Residential and ICI water demands represent approximately 85% and 15% of the total water demand, respectively

8 Historical and Projected Caledon East Population ( ) Population 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 Caledon East Population Historical and Projected ( ) Year

9 Historical and Projected Caledon East Average Day Demand ( ) Water Demand (m 3 /d) 5,000 4,500 4,000 3,500 3,000 2,500 2,000 1,500 1, Caledon East Water Average Day Demands Historical and Projected ( ) Permit ADD Limit Year Average Day Demand (ADD) Permit ADD Limit (1,800 m³/d) ADD w ith Water Efficiency (10% Reduction by 2015) Beginning in 2002, the MOE imposed a restriction on average day flow.

10 Historical and Projected Caledon East Maximum Day Demand ( ) 14,000 12,000 Caledon East Water Maximum Day Demands Historical and Projected ( ) Water Demand (m 3 /d) 10,000 8,000 6,000 4,000 2,000 Permit MDD Limit Year Maximum Day Demand (MDD) Permit MDD Limit (currently 4,500 m³/d) MDD w ith Water Efficiency (10% Reduction by 2015)

11 Information on Alternative Solutions Relevant to the Purpose of the Study Do Nothing Maintain existing pumping from the three wells per the current Permit to Take Water (PTTW) This would limit future growth in the community and would not meet the Offical Plan (OP) population projections Increase Yield from Existing Wells Previous studies and historical permits indicate that additional water may be available from the three existing wells A hydrogeological assessment and pump test would be needed to confirm how much water could be pumped without detrimental impact on the environment Based on the pump test, a revised PTTW could provide additional capacity to meet future water demands

12 Hydrogeological Study Methodology Complete door-to-door water well survey and inventory Install shallow groundwater observation wells Establish surface water flow and temperature monitoring stations Perform aquatic and terrestrial surveys Perform seven-day (168-hour) constant-rate pump test of Caledon East municipal wells (CE2, CE3, and CE4) Monitor response of private wells and natural heritage features to pumping of Caledon East municipal wells

13 Local Study Area and Cross-Section Locations

14 Geological Cross-Section A-A

15 Geological Cross-Section B-B

16 Interpreted Zone of Pumping Influence for CE2 and CE3

17 Interpreted Zone of Pumping Influence for CE4

18 Aquatic Assessment Photograph 2: Sept. 11th, 2006 Upstream view of confluence of Boyce s Creek and Tributary Photograph 3: Nov. 3rd, 2006 Upstream view of Boyce s Creek from station CE3 CEDP 4-02 Photograph 1: Sept. 11th, 2006 View of Boyce s Creek upstream of Wooden footbridge Hydrologic Chart Photograph 4: April 10th, 2006 View of Downstream end of Culvert east of Airport Road and Boyce s Creek Photograph 5: March 30th, 2007 View of Upstream end of Culvert west of Airport Road and Boyce s Creek Photograph 6: April 10th, 2006 Upstream view of Boyce s Creek approximately 500 m west of Airport Road

19 Terrestrial Assessment Natural Environment Characteristics within CE2/CE3 Zone of Influence Photograph 7: Sept. 11th, Downstream view of Locally Significant Wetland along Centreville Creek at station CE2 CEDP Photograph 8: March 30th, View of CE3 ESA near stations CE3-CEDP24-02 and CE3-CEDP4-02 Further analysis has indicated that a substantial reduction in the pumping duration (i.e., limiting pumping to a maximum of 16 hrs/day followed by a recovery period), will help maintain groundwater upwelling conditions and minimize potential impacts to the wooded swamp communities. Natural Environment Characteristics within CE4 Zone of Influence Photograph 9: April 10th, 2006 View of Boyce s Creek Wetland approximately 300 m west of Airport Road Photograph 10: View of View of CE4 CE DP16-03 (Breen) Pond near station CE4 CEDP16-03 west of Airport Road

20 Pump Test Results/Conclusions (CE2 and CE3) At the maximum pumping rate, a 25% reduction in upward hydraulic gradient was observed beneath Centreville Creek in vicinity of CE2 At the maximum pumping rate, shallow groundwater levels in wetland area adjacent to CE3 declined by 0.47 m during the later stages of testing At the maximum pumping rate, a less than 14% reduction in surface water flow was observed in the lower reaches of Boyce s Creek during the later stages of testing Limiting concurrent pumping of CE2 and CE3 to 8 hrs/day and 16 hrs/day, respectively, will mitigate these observed hydraulic responses The observed surface water levels and flows at the stations on Centerville Creek did not demonsrate any influence from the pumping of CE2 and CE3 The Deep Meltwater Channel Aquifer Zone, where CE2 and CE3 are constructed, is hydraulically separated from the Granite Stones Aquifer, where CE4 is constructed

21 Pump Test Results/Conclusions (CE4) Upward hydraulic gradients beneath Boyce s Creek were not affected by pumping of CE4 Surface water levels in local surface water features (e.g., Breen & Granite Stones Ponds) did not decline in response to the pumping of CE4 The observed surface water levels and flows at the stations on Bracken Creek did not demonsrate any influence from the pumping of CE4 Artesian flows to Boyce s Creek from CE5 reduced by 28%, representing less than 4% of overall baseflow in the creek A notice concerning private well monitoring was issued to 58 households prior to commencement of the pump test. Of the nine responses received, three private wells were monitored. No interference was observed during the pump test, and no complaints were received.

22 Evaluation Criteria Evaluation criteria for the selection of the preferred alternative solution were selected according to four categories: Technical (e.g., reliability, operation and maintenance requirements) Natural Environment (groundwater, surface water, and terrestrial) Socio-Economic (e.g., conforming with plans/policies, effects on approved growth/land use) Financial (e.g., capital cost, operating/maintenance cost)

23 Evaluation of Alternatives Do Nothing (current MOE restrictions ADD: 1,800 m³/d, MDD: 4,500 m³/d) This alternative would put additional pressure on the Region s ability to meet the average and maximum day demands of existing population Greater potential impacts on approved/proposed land uses and planned growth Potentially impacts the current level of service to existing residences, businesses and institutions Would have a greater impact on the local economy Increase Yield from Existing Wells (recommended ADD: 4,060 m³/d, MDD: 5,875 m³/d) The recommended pumping rates are not expected to have significant effects on the terrestrial ecosystems (wetlands) that line Bracken Creek, Centreville Creek and the lower portions of Boyce s Creek The recommended pumping rates are protective of the upwelling conditions in Boyce s Creek, Centerville Creek and Bracken Creek Small increase in operating costs to treat higher water flows Fewer potential impacts on approved/proposed land uses and planned growth Will not impact the current level of service to existing residences, businesses and institutions From this evaluation, the recommended alternative is: Increase Yield from Existing Wells. The existing water treatment system is able to treat the increased water yields from all three wells.

24 Recommendations PTTW should be revised to allow the Caledon East municipal wells to be pumped at average day and maximum day volumes of 4,060 m³/d and 5,875 m³/d, respectively CE4 should be the lead well, with CE2 and CE3 brought on-line as needed to meet system demands Because the increased yield will not accommodate the 2021 water demand, it is recommended that the Region explore the potential for developing further water sources to meet future demands.

25 What s Next? Collect and address comments (May 2007) Finalize Project File Summary Report (June 2007) Place Project File Summary Report on mandatory 30-day public review (June July 2007) Apply for a new Permit to Take Water (July 2007)

26 To view the Public Information Centre displays online, please visit our website:

27 What Can You Do? Fill out a comment sheet Send your comments by May 16, 2007 to: Wayne Simpson, P.Eng. Wesley Wright, M.A.Sc. Project Manager Project Manager Region of Peel Stantec Consulting Ltd. 11 Indell Lane Mississauga Road Brampton, ON Mississauga, ON L6T 3Y3 L5N 7G2 Tel: (905) x7913 Tel: (905) x337 Fax: (905) Fax: (905) wayne.simpson@peelregion.ca wesley.wright@stantec.com