The Emerging Network of Sandstone Monitoring Wells in Northeastern Illinois

Transcription

1 The Emerging Network of Sandstone Monitoring Wells in Northeastern Illinois Daniel R. Hadley, M.S Hydrogeologist Illinois State Water Survey Illinois Water Conference 2016

2 Outline Geology of the Sandstone Aquifers in Northeastern Illinois Decline of water levels in Sandstone Aquifers Current Network of Monitoring Wells Insights/Observations/Experiments Future Observation Wells/Program Goals

3 Hydrostratigraphic Cross Section (West to East) St. Peter Sandstone Ironton-Galesville Sandstone Both Confined in NE Illinois RECHARGE AREA

4 ( ) McHenry Lake DeKalb Kane DuPage A A Cook Kendall Grundy Will

5 Sandstone Monitoring Network Currently have 6 sites (7 Sandstone Wells) 2 USGS Sandstone Wells Pressure Transducer/Telemetry Hourly Measurements Groundwater Levels in real-time Use of Municipal/Industrial wells that are abandoned or in the process of being sealed

6 Benefits of a monitoring network Provides insight into daily and seasonal changes of water levels Serves as calibration for groundwater flow models Can capture large and unexpected events that would be missed with intermittent measurements Valuable for determining geologic/aquifer properties Serve as Laboratories for research - Slug Testing - Aquifer Tests to determine Transmissivity - Flow Logging to determine movement of groundwater between aquifers

7 Newark Observation Well Nested Observation Well 1,180 Deep One well open to St. Peter One well open to Ironton-Galesville March 2016-present

8 Newark Water Levels No Change in St. Peter Water Level since March 1 foot drop in Ironton-Galesville Water Level during summer Likely due to withdrawals 15 miles away at Minooka/Channahon Noise due to Barometric Pressure Change at land surface Barometer installed in September Water Level (ft AMSL) St. Peter Water Level (ft AMSL) Ironton-Galesville 594 3/1/2016 3/31/2016 4/30/2016 5/30/2016 6/29/2016 7/29/2016 8/28/2016 9/27/ /27/

9 Slug Testing Pneumatic Test Slug of air introduced in Aquifer Released and response measured Used to determine hydraulic conductivity (K) K SP = 6.9 ft/day K IG = 2.8 ft/day Very valuable for groundwater flow modeling Pressure Head (PSI) Total Pressure Air Stabilizes Introduced Ball Valve Opened (Drop in Pressure) Time (sec) St. Peter Slug Test #3 Oscillatory Response Recovery of Head

10 Geneva #5 Observation Well No longer used by City 1615 deep Open to St. Peter and Ironton-Galesville August 2015-present 4-5 foot drop since end of May Coincides with large increase in groundwater withdrawal at Aurora Blue-green Algae in Fox River Produced MIB, organic compound with foul odor Essentially a large scale Aquifer Test! Water Level (ft AMSL) Water Elevation Site Visit 373 7/30/2015 9/28/ /27/2015 1/26/2016 3/26/2016 5/25/2016 7/24/2016 9/22/ /21/2016

11 Geneva Geophysical/Flow Logging Collapse at 1615 depth Water is well mixed between the St. Peter and Ironton Galesville Sandstones Several flow logging runs (up and down) Indicates slight upward flow from Ironton- Galesville to St. Peter Working on converting to volumetric flow SP IG

12 Metro Sanitary District #2 Observation Well 1683 deep Open to St. Peter and Ironton-Galesville Hand Measurements/Recorder Chart Decline through 1980 s Recovery after many communities switched to Lake Michigan Water 250 Water Level (ft AMSL)

13 Metro Sanitary District #2 Observation Well Transducer record July 2016-present Little change through summer Fluctuations due to barometric pressure Inverse Response Water Level (ft AMSL) Site Visit Water Elevation Barometric Pressure /9/2016 8/8/2016 9/7/ /7/ Barometric Pressure (mbar)

14 The Others Lake Barrington Shores #2 (10/18-present) Water Level (ft AMSL) Water Elevation Site Visit /18/ /19/ /20/ /21/ /22/ /23/ /24/2016 Water Level (ft AMSL) Fermilab #4 (Sept 7 th - present) Water Elevation Site Visit /7/2016 9/17/2016 9/27/ /7/ /17/ /27/2016 Water Level (ft AMSL) Des Plaines #7 (June 2015-present) Water Elevation /10/2016 6/9/2016 7/9/2016 8/8/2016 9/7/ /7/2016

15 Future Goals/Directions Plan to add 8 or 9 more monitoring wells Emphasis on Joliet Area Transducer data from municipalities to supplement network Joliet Aurora Shorewood Flow Logging where there is a greater head difference between aquifers Public access to view data in real time

16 Questions? Contact:

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18 Hydrostratigraphic Cross Section (West to East) St. Peter Sandstone Ironton-Galesville Sandstone Both Confined in NE Illinois Pressure Head above land surface prior to development = Flowing Artesian Wells

19 Hydrostratigraphic Cross Section (West to East) St. Peter Sandstone Ironton-Galesville Sandstone Both Confined in NE Illinois Pressure Head decline = Desaturated Aquifers under Pumping Conditions