Four concrete boxes were found at the site of the collapse in the Dormont Pool parking lot, and officials now have a better idea of what the structures might have been used for.
Borough manager Jeff Naftal said the concrete containers appear to be a water management system which would have allowed storm water to enter a concrete channel, then overflow into the first structure, and into the others as needed.
The boxes likely managed water coming from the street, but Naftal said that detail is still unclear.
A crew from Niando construction collapsed and partially filled two boxes over the weekend, and began excavating the third and fourth on Monday.
"We are hopeful that four is the end, but won’t know until we dig that one out whether there is one under the street," Naftal said in an email to Dormont-Brookline Patch.
The cost to collapse and fill the boxes and repair the parking lot is not yet known, but Naftal said Dormont Council would discuss the matter at the April meeting.