Jeff Schwindaman, P.G. May 31, 2018 US Army Corps of Engineers

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Presentation transcript:

Monitoring Potential Saltwater Intrusion Related to Deepening of Savannah River Channel Jeff Schwindaman, P.G. May 31, 2018 US Army Corps of Engineers BUILDING STRONG®

Overview You are here

Conceptual Model – pre-development (USGS, 2006)

Conceptual Model – present day (USGS, 2006)

Groundwater Management Plan (2006 – present) (GAEPD, 2006)

Savannah Harbor Expansion Project (SHEP)

Timeline of SHEP GW Monitoring Program 1998 – Initial Aquifer Study 2007 – Supplemental Aquifer Study 2011 – 401 Certification 2013 – Groundwater Monitoring Plan 2013 to 2017 – Annual Groundwater Monitoring Reports 2017 – Background Groundwater Monitoring Report

Hydro-stratigraphic Cross Section “Tybee High”

Supplemental Aquifer Study

Thickness of Confining Unit

SHEP Groundwater Model Results

SHEP Groundwater Model Results

Monitoring Requirements Construct a network of groundwater monitoring wells. Collect background (pre-dredging) groundwater samples. Establish benchmark Cl- concentrations for each sentry well. 401 Certification, section 4

1. Construct Groundwater Monitoring Network (2009-2013) Upgradient GW FLOW Downgradient

1. Construct Groundwater Monitoring Network (2009-2013) MW-2R, MW-3, MW-6, MW-7 MW-1, MW-4, MW-5, MW-8 Surficial Aquifer Miocene Confining Unit Upper Floridan Aquifer

2. Collect Background (pre-dredging) Cl- Samples (2013-2017)

3. Establish Benchmark Cl- Concentrations (2017) CDM Smith updated groundwater model in 2015. Created statistical tool for establishing benchmarks. 95% Upper Prediction Limits (UPLs) and Model-based benchmarks. MW-4 MW-4

3. Establish Benchmark Cl- Concentrations Background data 95% UPL benchmark 95% UPL benchmark (projected) Model based benchmark

Conclusions Robust GW monitoring network. Groundwater head gradient is driving saltwater intrusion. Dredging anticipated to have negligible effect. Monitor for upward trends that exceed predictions. Processes in place in case of exceedance.

References CDM Smith, 2015. Savannah Harbor Expansion Project Updated Saltwater Intrusion Modeling to Support the Groundwater Monitoring Program. Technical Memorandum. January 29, 2016. CDM Smith, 2005. Savannah Harbor Expansion Three-Dimensional Salt Water Intrusion Modeling. Technical Memorandum. September 27, 2005. EPA, 2009. Statistical Analysis of Groundwater Monitoring Data at RCRA Facilities, Unified Guidance. EPA 530 R/-09-007. U.S. Environmental Protection Agency. March 2009. GAEPD, 2006. Coastal Georgia Water and Wastewater Permitting Plan for Managing Salt Water Intrusion. Georgia Environmental Protection Division. June, 2006. USACE, 2013. Savannah Harbor Expansion Project: Groundwater Monitoring Plan. U.S. Army Corps of Engineers Savannah District. March 2013. USACE, 2017. Background Groundwater Monitoring Report. Savannah Harbor Expansion Project. U.S. Army Corps of Engineers Savannah District. December 2017. USGS, 2006. Simulation of Saltwater Movement in the Upper Floridan Aquifer in the Savannah, Gerogia – Hilton Head Island, South Carolina, Area, Predevelopment – 2004, and Projected Movement for 2000 Pumping Conditions. Provost, A.M., Payne, D.F., Voss, C.I. United States Geological Survey. 2006.

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