Groundwater Vulnerability Analysis Assessment Report: Guidance Module 3 RFP Teleconference - PowerPoint PPT Presentation

Loading...

PPT – Groundwater Vulnerability Analysis Assessment Report: Guidance Module 3 RFP Teleconference PowerPoint presentation | free to view - id: 10b59e-ZDc1Z



Loading


The Adobe Flash plugin is needed to view this content

Get the plugin now

View by Category
About This Presentation
Title:

Groundwater Vulnerability Analysis Assessment Report: Guidance Module 3 RFP Teleconference

Description:

Draft Guidance Module 4: Surface Water Vulnerability Analysis ... may be appropriate for complex hydrogeological settings (e.g., karst terrain) ... – PowerPoint PPT presentation

Number of Views:92
Avg rating:3.0/5.0
Slides: 11
Provided by: scottchr
Category:

less

Write a Comment
User Comments (0)
Transcript and Presenter's Notes

Title: Groundwater Vulnerability Analysis Assessment Report: Guidance Module 3 RFP Teleconference


1
Groundwater Vulnerability AnalysisAssessment
Report Guidance Module 3RFP Teleconference
  • Presentation by
  • Rick Vantfoort, Ministry of the Environment
  • November 6, 2006

2
Eligible Technical Studies
  • Draft Guidance Module 3 Groundwater
    Vulnerability Analysis
  • Draft Guidance Module 4 Surface Water
    Vulnerability Analysis
  • Draft Guidance Module 5 Issues Evaluation and
    Threats Inventory
  • Draft Guidance Module 6 Water Quality Risk
    Assessment

3
Basic Steps
  • Basic approach using existing information
  • Identify vulnerable areas (WHPAs)
  • Map relative intrinsic vulnerability within each
    area (High/Med/Low)
  • Establish vulnerability scoring (numeric 2-10)
  • Adjust vulnerability (if necessary) to account
    for constructed pathways
  • Determine / assign Tier 1 and/or 2 vulnerability
    scores for SQRA
  • Assign uncertainty rating (High/Low)
  • Provide above results in map form
  • Provide input on a continuous improvement plan
  • Where prominent data gaps affect the
    hydrogeologic interpretation, additional study or
    use of advanced models may be necessary

4
Models and Methods for WHPA Mapping
  • 3D numerical models most commonly used approach
    with the current level of available hydrogeologic
    data
  • Simpler (non-numerical) approaches are likely
    appropriate where data and/or risks are limited
    (using existing data)
  • Advanced hydrogeological studies may be
    appropriate for complex hydrogeological settings
    (e.g., karst terrain). Additional study must be
    warranted by data gaps and a defined benefit to
    improved model and source protection
  • WHPA zones based on Time-of-Travel (TOT) only
    (e.g., 2, 5 and 25 yr)

5
Models and Methods for Vulnerability Assessment
  • Basic Hydrogeological Assessment
  • Aquifer Vulnerability Index (AVI) / Intrinsic
    Susceptibility Index (ISI) or other index
    approaches
  • Surface to Aquifer Advective Time (SAAT)
  • Advanced Hydrogeological Assessment
  • Special Considerations
  • Intrinsic Vulnerability (Chemical Independent)
  • Identification of Target Aquifers
  • Incorporation of High-Quality Data
  • Validation with Observed Water Quality (not
    monitoring)
  • Local Scale Improvements

6
Intrinsic Vulnerability Scoring in WHPA
Zone A 100 m
Zone D 25 yr TOT
10
M
M
L
L
8
H
H
H
M
M
6
4
DNAPL Scoring
Pathogen Scoring
2
10 yr TOT
Zone B 2 yr TOT
Zone C 5 yr TOT
7
Constructed Preferential Pathway SQRA Adjustment
(Examples)
Zone A 100 m
Zone D 25 yr TOT
High Density of Improperly Abandoned Boreholes
10
M
M
Quarry
L
L
8
H
H
H
M
M
6
4
2
10 yr TOT
Zone B 2 yr TOT
Zone C 5 yr TOT
8
Uncertainty / Level of Confidence Assessment
  • Uncertainty rating assigned to each sensitivity
    area (high/low) for input into Water Quality Risk
    Assessment
  • Need to assess uncertainty in both the footprint
    of the vulnerable area and in the vulnerability
    rating
  • Considerations include
  • input data completeness and reliability
  • Model selection, correlation and validity
  • Water quality data, if available, may validate
    this analysis
  • Will assist in identifying additional data
    analysis or needs in future planning cycles

9
Summary
  • Establish vulnerable areas for municipal supply
    wells (WHPAs) based upon available data and
    appropriate methodology
  • Assess vulnerability scoring for sensitivity
    areas
  • Assess preferential pathways and, if necessary,
    review relative vulnerability
  • Assess certainty and determine continuous
    improvement plan

10
T h a n k Y o u !
About PowerShow.com