Amendment to Professional Services Agreement - Weaver Consultants Group - Seal and Abandon Additional Groundwater Wells at Studebaker Museum

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Ms. Ann Koiata Page 2 of 3 residential tap water SL of 1.7 µgll, was detected at 56.0 pg/l and total petroleum hydrocarbons C3-C36 with a SL of 266.E pg/i and was detected at 83,000 pgll. Vapor Intrusion - All soil and ground water samples collected were below residential vapor exposure screening levels for all chemical constituents except for trichloroethene which has a vapor exposure screening level of 9.1 pg/i was detected in monitoring well MW-7 at 9,5 pg/I; however the depth to water at this location is greater than twenty (20) feet and would not pose a vapor exposure risk at this depth. The following are additional lines of evidence regarding current conditions at the Site for the subject release. a Most or all of the source was removed Residual contamination is at the depth greater than 20 feet Residual contamination from a petroleum release in the ground water above screening levels is limited to one monitoring well, is in the vicinity of the former UST basin, and should attenuate within five years Current drinking water is provided by municipal water utility • The source of the trichiomethene detected on the property is not located on this property Based on the technical reports reviewed by IDEM and the additional lines of evidence, IDEM concludes that no further response actions are required as lone as the owner abandons the monitoring wells in accordance with 312 IAC 13-10-2 and that you comply with the conditions of this decision. This NFA determination is biased on information known to IDEM at the time of issuance of this letter. if additional information is subsequently obtained by IDEM indicating that the Site poses a risk to human health or the enVironment, IDEM reserves the right to modify or revoke this NFA determination as the situation may warrant. This NFA determination is based on the Remediation Ciosure Guide non -rule policy document (NPD) guidelines and conditions: e Unconditional closure for soil exposure • Conditional closure for ground water exposure • Unconditional closure for vapor intrusion exposure • Recorded Environmental Restrictive Covenant (Enclosed) Notice of Contamination within Wellhead Protection Area sent to the City of South Bend (Enclosed) All wells installed associated with the release at the site must be permanently abandoned in accordance with the Indiana _Department of Natural Resources (IDNR) regulation 312 IAC 13-10-2 (Permanent Abandonment of Wells) and IDE.M's "Driiiing Procedures and Monitoring Well Guidelines Non -rule Policy Document (Waste-0053)".