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1 Identification of Significant Threats in Vulnerable Areas Presentation to: Source Protection Committee South Georgian Bay Lake Simcoe SPR October 23,

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Presentation on theme: "1 Identification of Significant Threats in Vulnerable Areas Presentation to: Source Protection Committee South Georgian Bay Lake Simcoe SPR October 23,"— Presentation transcript:

1 1 Identification of Significant Threats in Vulnerable Areas Presentation to: Source Protection Committee South Georgian Bay Lake Simcoe SPR October 23, 2008 Lloyd Lemon, M.Sc., P.Geo. Jagger Hims Limited

2 Overview 1) Assessment Report Requirements 2) Vulnerable Area Delineation 3) Significant, Moderate or Low Threats 4) Discussion

3 Assessment Report Contents Watershed Characterization (Part II) Water Budget (Part III) Vulnerable Area Delineation (Part IV – IX) Drinking Water Threats (Part X, XI) Significant, Moderate or Low Drinking Water Threats

4 Vulnerable Area Delineation (Part IV – IX) Qualitative Description Delineate Vulnerability (Part IV) Delineate (Part V): Highly Vulnerable Aquifers (Part V.1) Significant Groundwater Recharge Areas (Part V.2) Wellhead Protection Areas (Part V.3)

5 5 JHL AVI Map for Uppermost Aquifer Durham Region in SGBLS-SPR Aquifer Vulnerability Index Durham Region

6 6 JHL AVI Map for 2nd Aquifer Durham Region in SGBLS-SPR Aquifer Vulnerability Index Durham Region

7 7 JHL AVI Map for 3rd Aquifer Durham Region in SGBLS-SPR Aquifer Vulnerability Index Durham Region

8 Vulnerable Area Delineation (Part IV – IX) Qualitative Description Delineate Vulnerability (Part IV) Delineate (Part V): Highly Vulnerable Aquifers (Part V.1) Significant Groundwater Recharge Areas (Part V.2) Wellhead Protection Areas (Part V.3)

9 9 DRAFT Significant Groundwater Recharge Areas

10 Vulnerable Area Delineation (Part IV – IX) Qualitative Description Delineate Vulnerability (Part IV) Delineate (Part V): Highly Vulnerable Aquifers (Part V.1) Significant Groundwater Recharge Areas (Part V.2) Wellhead Protection Areas (Part V.3)

11 11 JHL WHPA in Bradford (Unlabelled) Time of Travel Zones only EXAMPLE WHPA

12 12 JHL WHPA for Doane (Unlabelled) Time of Travel Zones only EXAMPLE WHPA

13 Vulnerable Area Delineation (Part IV – IX) Delineate Surface Water Intake Protection Zones (Part VI) Assign Vulnerability Scores to Vulnerable Groundwater Areas (Part VII)

14 Vulnerable Area Scoring Highly Vulnerable Area: 6 Significant Groundwater Recharge Area High Vulnerability = 6 Moderate Vulnerability = 4 Low Vulnerability = 2 Can Increase with Transport Pathway Adjustment

15 Vulnerable Area Scoring Wellhead Protection Areas WHPA Vulnerability HighMediumLow A10 B 86 C/C1864 D642

16 16 JHL WHPA for Doane (Unlabelled) Vulnerability Scores only EXAMPLE VULNERABILITY SCORE LOW VULNERABILITY IN WHPA

17 EXAMPLE VULNERABILITY SCORE PRIVATE WELLS AS TRANSPORT PATHWAY

18 18 JHL WHPA for Doane (Unlabelled) Vulnerability Scores with Transport Pathways INCREASED VULNERABILITY SCORE PRIVATE WELLS AS TRANSPORT PATHWAY (WITH 30 m BUFFER)

19 Significant, Moderate or Low Threats List Activities that would be drinking water threats in Vulnerable Areas Table of Drinking Water Threats developed on “Risk-Based Process” as per Rule For each Activity/Condition (Property) identify threats as significant, moderate, or low based on Vulnerability Score

20 Drinking Water Threats Waste Disposal Site Sewage Storage and Disposal Application of Agricultural Source Material (ASM) Storage of ASM Management of ASM Application of Non-ASM Storage of Non-ASM Application of Fertilizer Storage of Fertilizer Application of Pesticide Storage of Pesticide Application of Road Salt Storage of Road Salt Storage of Snow Storage of Fuel Storage of dense non-aqueous phase liquid (DNAPL) Storage of organic solvent Management of de-icing runoff

21 Significant, Moderate or Low Threats List Activities that would be drinking water threats in Vulnerable Areas Table of Drinking Water Threats developed on “Risk-Based Process” as per Rule For each Activity/Condition (Property) identify threats as significant, moderate, or low based on Vulnerability Score

22 22 JHL Threats Identified for Doane (Unlabelled) THREAT LOCATIONS

23 Significant, Moderate or Low Threats List Activities that would be drinking water threats in Vulnerable Areas Table of Drinking Water Threats developed on “Risk-Based Process” as per Rule For each Activity/Condition (Property) identify threats as significant, moderate, or low based on Vulnerability Score

24 Table of Drinking Water Threats For each “Threat” – Significance is Rated based on: Individual Chemicals or pathogens within category Quantity of Chemicals or Pathogens Application Rates Type of Vulnerable Area Vulnerability Score

25 Table of Drinking Water Threats Example 1: For a Sewage System with maintenance of an On-Site Septic System Holding Tank Threat for pathogens is Significant in WHPA areas with Vulnerability Score of 10 Threat for pathogens is Moderate in WHPA areas with vulnerability score of 8 Threat for pathogens is Low in WHPA areas with vulnerability score of 6 Threats for chemicals is typically lower

26 26 JHL Classified Threats for Doane (Unlabelled) EXAMPLE CLASSIFIED THREATS

27 Example 2 Commercial Area High Vulnerability No Pathways Adjustment

28 28 JHL WHPA for Creemore (Unlabelled) Vulnerability Scores only EXAMPLE 2 WHPA

29 29 JHL WHPA for Creemore (Unlabelled) Vulnerability Scores with Pathways EXAMPLE 2 VULNERABILITY SCORES HIGH VULNERABILITY IN WHPA

30 EXAMPLE 2 ADJUSTED VULNERABILITY SCORES

31 31 JHL Threats for Creemore (Unlabelled) EXAMPLE 2 THREATS SANITARY SEWERS INTRODUCED IN 2000 HISTORICAL THREATS ??

32 32 JHL Significant, Moderate, Low Threats for Creemore (Unlabelled) EXAMPLE 2 CLASSIFIED THREATS

33 Challenges Data Consistency & Accuracy (threat mapping to orthophotography must line up with property fabric) Transport Pathway Rules? Assigning vulnerability or point source threats to a property fabric Most concern for future policies – options? Properties with a small corner in the higher vulnerability area may be over-protected – can we manipulate

34 Discussion


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