A GROUNDWATER MANAGEMENT PLAN FOR STUTTGART. Dr. Sandra Vasin Hermann Josef Kirchholtes

Transcription

1 A GROUNDWATER MANAGEMENT PLAN FOR STUTTGART Dr. Sandra Vasin Hermann Josef Kirchholtes

2 1 WHY DO WE NEED A MANAGEMENT PLAN?

3 The usage of CHC in Stuttgart over several decades has caused a severe contamination of the mineral springs.

4 Concentration [µg/l] 35 years of an intensive single site remediation Mineral springs are still contaminated with CHC Mineral spring Mombachquelle Tetrachloroethene (PCE) Trichloroethene (TCE)

5 Geological build-up City of Stuttgart Mineral springs Understanding the hydrogeological and contaminant situation in the complex system is challenging Protection zones periphery inner core Geotechnical boreholes for building purposes Groundwater extraction wells Groundwater wells for remediation purposes Monitoring wells PT analysis

6 General planning of activities Technical - to investigate the system - to identify contaminated sites - to remediate with a proper method - to monitor remediation (success) - to monitor the quality of GW Administrative - to secure finance - to obey law(s) - to involve responsible bodies, land/site owners, land/site users, stakeholders, consultants run/operate in a long term need for a management of GW contamination in a long term sense Think holistic from the very beginning & make a sustainable / realizable 6 plan

7 Meaning of the Management Plan Identification of groundwater contamination We have a problem! description of a system: 1flow and contaminant situation related processes targets: 2to be achieved in the future prioritization need for action: 3necessary measures to achieve the targets A management plan is a program for improving a groundwater quality in the future, a technical basis for decision makers

8 2 MAGPlan A CLEAN GROUNDWATER FOR STUTTGART

9 MAGPlan Project: a management plan for Stuttgart downtown focus on key sites City of Stuttgart Mineral springs MAGPlan area 182 potentially contaminated sites with CHC Aim: to determine the key contaminated sites, which influence the quality of mineral water springs

10 MAGPlan Procedure: Description of the System Conceptual model focus on key sites Investigation Spreading of plumes in space and time Related processes data collection drilling, drill core analysis sampling, chemical analysis pumping, tracer tests isotopic analysis microbiological analysis Numerical model Flow and contaminant transport Identification of relevant contaminated sites Scenario modelling MAGPlan area Mineral springs 182 potentially CHC contaminated sites Sites with impact on deeper layer [19] Sites with impact on mineral water aquifer [9]

11 MAGPlan Procedure: Prioritization focus on key sites PRIORITY # 1 # 2 # 3 RECEPTOR Mineral springs Mineral water aquifer GW above mineral water aquifer TARGET Complete prevention of contamination input Total CHC <5 µg/l Species CHC <1 µg/l Load <20 g/d Total CHC <10 µg/l SITE ASSIGNMENT #9 #1 #2 #7 #3 #6 #8 Prioritization in Stuttgart is influenced by the requirements of the mineral springs protection law

12 MAGPlan Procedure: Action Plan focus on key sites The Management Plan for Stuttgart included feasibility studies and monitoring programs for four key contaminated sites MAGPlan area Mineral springs 182 potentially CHC contaminated sites Sites with impact on deeper layer [19] Sites with impact on mineral water aquifer [9] High remediation priority [4]

13 MAGPlan Implementation Afterlife Involvement of the responsible authority Establishment of the action plan for 5 years Contaminated site #9 with the highest priority: 400,000 for investigation and 2 Mil. for remediation was secured by City Council 27 wells were drilled Remediation possibilities are being investigated Clarification of responsibilities Securing funding (submission to the City Council)

14 3 AMIIGA MANAGEMENT STRATEGY AND GUIDANCE

15 AMIIGA Project: The development of the Management Strategy Pilot projects Diverse local conditions 7 documents PL Jaworzno Geology DE CZ Stuttgart-Feuerbach Nový Bydžov GW use Contamination Goals / focus To be tailored into the same structure: GW Management Plan Management Strategy IT Milan Parma Legal frameworks SI Ljubljana Responsibilities HR Zadar The main objective is to establish a shared transnational management strategy to deal with groundwater contamination

16 AMIIGA Project: Regional Implementation Group RIG Full and associated partners Authorities on different administrative levels (local, regional, national, etc.) Stakeholders (land owners, polluters, remediation performers, residents, etc.) To contribute to the development and to guarantee a proper implementation of Management Plans Consultants, individuals with particular expertise (technical/personal) Regular meetings RIG: involvement of cross-sectional & cross-hierarchical partnership for the implementation of the management plans

17 AMIIGA Project: a management plan for S-Feuerbach focus on contaminated plumes in public areas City of Stuttgart Mineral springs MAGPlan area AMIIGA area Industrialized district More than 1.3 employees/inhabitant 140 potentially CHC contaminated sites Point source & mixed contamination

18 Data base AMIIGA Project: Goals focus on contaminated plumes in public areas Site remediation for more than 30 years on many contaminated sites EU-funded projects: MAGIC ( ), FOKS ( ) 682 GW wells built in 7 aquifers Chemical analysis data for more than 30 years Pumping tests Isotopic analysis Target at site not reached (CHC<10 µg/l and load < 20 g/d) Contaminated plumes in public areas still present How to cope with the problem of plumes in public areas? Who is responsible for a plume? The goal is to develop an integral monitoring network to observe the contaminant situation in S-Feu

19 4 BRIEF RECAP

20 To handle mixed contamination in an urban area, a good, sustainable, realizable plan is necessary Management Plan is developed for Stuttgart downtown Management Plan is successfully implemented in 7 Central Europe areas Management Strategy Final Conference, 2019 Jaworzno, Poland sandra.vasin@stuttgart.de

21 T H A N K Y O U Dr. Sandra Vasin Project Manager, City of Stuttgart, Department for Environmental Protection sandra.vasin@stuttgart.de