Second Amendment to PSA - JPR Corp - Becks Lake Site

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Scope of Work Changes and Cost Adjustments Beck's Lake NPL/LaSalle Park Area Attn: Stephanie Steele August 1, 2019 The existing PSA (including the scope and cost changes with the First Amendment dated November 13, 2018) included costs for general consulting through June 2019. Since the project is ongoing, general consulting will be necessary to assist the City of South Bend with EPA requirements. Therefore, the following cost adjustment includes anticipated general consulting costs through December 2019: • Senior Geologist @$130/hour — estimated 77 hours for July 2019 through December 2019 at direction of the Project Coordinator. Task 5 (New Task): Soil Sampling to Define Areas of Concern Net Task Change: $35, 000" funding including costs for field labor, field supplies, laboratory analysis, data validation, surveying, document preparation, and project management. Per a meeting with EPA and City of South Bend representatives on July 2, 2019 at the EPA Region V Offices in Chicago, Illinois, the EPA expressed concern over potential lead exposure to park visitors from surface and near surface soil at the LaSalle Park Area portion of the Beck's Lake NPL Site. In particular, the EPA (under a new project management team) requested the excavation, disposal, and backfill of three areas which had previously indicated lead concentrations in surface soils, obtained from the interval of 0.0'-0.5' below grade level (bgl), in excess of 400 mg/kg (i.e., EPA residential direct contact exposure level). In order to better define the extent of lead impact in the three areas of concern, JPR proposes to collect up to twelve, evenly spaced soil samples, across each of the three areas of concern as indicated on Figure 1. Each discrete soil sample will be collected from a depth of 0'-1' bgl using a manually operated soil sample probe. It should be noted that the previous 2016 surface soil sampling event (on which the EPA remediation request is based upon) was completed at a frequency of four samples per acre and only included sample depths of V-0.5' bgl. Subsequent subsurface soil sampling began no shallower than 1' bgl. This proposed sampling will eliminate the data gap for the interval of 0.5'-1' bgl and should significantly reduce the size of the areas for which remediation is requested by the EPA. Therefore, a total of 39 discrete soil samples (including three duplicates) will be collected from depths of V-1' bgl across the three areas of concern for analysis of total lead. Up to two equipment rinseate samples will also be collected and analyzed for total lead. The EPA also requested up to twenty acres of LaSalle Park be capped with a one -foot thick cover of clean fill and topsoil. The area of requested cap material corresponds with the area of LaSalle Park which had historically been filled with various materials including foundry sand, slag, and miscellaneous construction debris. Only one of the surface soil samples (obtained from a depth of 0.0'-0.5' bgl) collected in 2016 from the "fill area" exhibited concentrations of lead in excess of the 400 mg/kg residential direct contact exposure level. However, since some near surface soils obtained from depth intervals of V-2% V-3', and V-4' collected during the 2016 sampling in the "fill area" did exhibit lead concentrations in excess of 400 mg/kg, the EPA is assuming the entire 20-acre "fill area" would require a one -foot cap to protect park visitors from potential lead exposure. Preliminary EPA - estimated costs for the capping of the 20-acre "fill area" is in excess of 1.2 million dollars. In order to reduce the area for which a cap would be needed, JPR plans to collect surface soil samples from the interval of 0.0'-0.5' and near -surface soil samples from the interval of 0.5'-1.0' bgl across the entire 20-acre "fill area". The sample locations will correspond to the exact locations which were utilized for the surface soil sampling conducted in 2016. Up to four composite soil samples will be collected from each approximate one -acre section. The samples will be collected in the same manner