Proposal - Investigation and Sampling for Nitrate Source at Organic Resources Facility, Lagoon #4

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September 24, 2020 Andrea Alexander Manager of Environmental Compliance Division of Utilities | Wastewater City of South Bend 3113 Riverside Drive South Bend, IN 46628 aalexand@southbendin.gov Re: Proposal for Nitrate Source Investigation Organic Resources Facility Closed Biosolids Landfill 4340 Trade Drive, South Bend, Indiana KERAMIDA Proposal No. P24080R Dear Ms. Alexander: In accordance with your request, KERAMIDA Inc. (KERAMIDA) has prepared this proposal and cost estimateto perform a groundwater investigation to assess the source of the nitrate Groundwater Protection Organic Resources Facility closed Standard (GWPS) exceedances in MW-13 and MW-14 at the biosolids landfill, located at 4340 Trade Drive in South Bend, Indiana. Details of the work to be performed are presented in the following sections. BACKGROUND There is an ongoing groundwater monitoring and statistical analyses program at the Organic Resources Facility closed biosolids landfill at 4340 Trade Drive in South Bend, Indiana. Monitoring Well (MW) MW- 13,reported nitrate levels exceeding the site-specific GWPS. In an effort to establish the nature and extent of the nitrate exceedance, a hydrogeologic investigation was performed in June 2020. The results of the June 2020 investigation indicated MW-13 and newly installed MW-14 to the north are monitoring the St. Joseph Aquifer. Based on this interpretation and the placement of MW-13 and MW-14 in the St. Joseph Aquifer, the source of the nitrate detected in MW-13 and MW-14 would be to the west. In correspondence dated September 3, 2020, the Indiana Department of Environmental Management (IDEM) requested that the Biosolids facility be evaluated as the source of the nitrate exceedances occurring in MW-13 and MW-14. IDEM also requested an evaluation of monitoring the past exceedances that occurred in MW- 5R. The second semiannual 2020 groundwater sampling event is scheduled in October and will be performed by the City of South Bend. The proposed scope of work outlined in the following sections is designed to address the IDEM comments and resolve the issue regarding the source of the nitrate exceedances occurring in MW-13 and MW-14. SCOPE OF WORK The proposed scope of work is designed to maximize the collection of groundwater quality data to resolve concerns expressed by IDEM and minimize any subsequent monitoring well installations.