In his final report, Ted Dean (ATS) concluded that there were, indeed, some water-filled voids underlying portions of the park, most notably on line 1, air-filled voids on line 2, and either air-filled, or acid mine water on lines 3 and 4. In addition, Mr. Dean indicated that the data on lines 3 and 4 "suggested the potential for further collapse and subsidence. Line 5, which runs along Bunker Hill on the northern portion of the park, found some evidence of possible mine workings, but the voids were so far below the surface that they posed only negligible risk. (see Map 3)

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