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OmniPlex, South Bend — Political Subdivision Comfort Letter <br />BFD #4000022 <br />June 29, 2023 <br />Page 7 of 12 <br />TABLE 2 <br />2022 Groundwater Concentrations Exceeding IDEM R2 Published Levels <br />Contaminant <br />Detected <br />Sample Location <br />Results ppb <br />GWPL <br />Benzo(a)anthracene <br />B-32 <br />25 <br />0.30 <br />B-36 <br />0.49 <br />Benzo(a)pyrene <br />B-32 <br />2.3 <br />2 <br />Benzo(b)fluoranthene <br />B-32 <br />3.2 <br />3 <br />Fluorene <br />B-32 <br />530 <br />300 <br />Trichloroethylene <br />B-44 <br />5.1 <br />5 <br />B-45 <br />5.2 <br />1-Methyl naphthalene <br />B-7 <br />15.5 <br />10 <br />B-11 <br />90.9 <br />B-22 <br />46.5 <br />B-32 <br />127 <br />B-33 <br />73.5 <br />FD-2 <br />79.8 <br />B-34 <br />16.3 <br />B-36 <br />33.2 <br />B-37 <br />73.5 <br />2-Methylnaphthalene <br />B-11 <br />59.8 <br />40 <br />Naphthalene <br />B-7 <br />1 A <br />1 <br />B-11 <br />34.7 <br />FE <br />B-22 <br />4.2 <br />B-32 <br />135 <br />B-37 <br />13.5 <br />Pyrene <br />B-32 <br />275 <br />100 <br />PCB-1260 <br />FD-2 <br />0.25 <br />0208 <br />Notes: bold =above R2 Groundwater Published Level <br />FD =field duplicate - ppb =parts per billion <br />Technical Summary <br />Heartland concluded that due to historical Site operations, certain locations <br />throughout the Site have contamination in shallow soil of various PAHs, arsenic, lead, <br />and naphthalene above their respective R2 published levels. In addition, <br />benzo(a)pyrene was detected in one soil sample location (13-5) above its RSPL, CSPL, <br />and XSPL. To be protective, the area around soil sample location M must either be <br />capped with a two -foot barrier of "clean" soil, covered by a building, surface parking lot <br />or sidewalk, or excavated with confirmation samples collected to confirm the removal of <br />contaminated soil above applicable CSPLs and/or XSPLs. <br />