Amendment to PSA - Jones Petrie Rafinski - Beck's Lake Project

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Scope of Work and Cost Proposal for Beck's Lake NPL/LaSalle Park Area October 12, 2018 Page 2 of 4 Validation of laboratory analyses of soil samples (validation subcontractor additional cost $3,500) Task 2: Monitor Well Installation, Development, and Groundwater Sampling Net Contract Change: $21,500 increase The original SOW in the PSA only included sampling of the 8 planned new monitor wells in the Right -of -Way north of Linden Avenue. The Groundwater Investigation Work Plan (approved by the EPA on October 9, 2018) includes the sampling of the 13 existing monitor wells on the LaSalle Park property in addition to the 8 planned new monitor wells resulting in the following cost adjustments: • Supervising Environmental Manager @$140/hour — estimated 12 additional hours (review of additional data and documentatio related to expanded project scope) • Senior Geologist (Project Manager) @$130/hour — estimated 76 additional hours (sampling of additional wells and associated data interpretation and report preparation) • Field Geologist @$95/hour — estimated 76 additional hours (sampling of additional wells and associated data acqisition and report preparation assistance) • Drummed soil disposal (waste disposal subcontractor additional cost $2,400) • Survey of soil boring and monitor well locations (survey subcontractor additional cost $220) • Specialized sampling equipment rentals (equipment subcontractor additional cost $1,865) 4 Laboratory analysis of 21 groundwater samples (plus duplicates, field blanks and trip blanks) for TAL metals, VOCs, and SVOCs (laboratory subcontractor cost reduction $5,750) * Validation of laboratory analyses of soil samples (validation subcontractor additional cost $4,400) Task 3: Soil Management Plan Implementation and Waste Soil Disposal Net Contract Change: $35,000 increase Removal of the stockpiled soil was conducted on August 21-22, 2018. The original estimated amount of soil to be removed was 800 tons. During that activity, a total of 1595.98 tons of soil was removed from the site and disposed at Prairie View Landfill in Wyatt, Indiana resulting in the following cost adjustments: Waste disposal — estimated 800 tons @$44/ton ($35,200) Actual amount was 1595.48 tons @ $44/ton for a total of $70,201.12 resulting in an increase of $35,000.