The Home Energy Efficiency Team (HEET) worked with the Metropolitan Area Planning Committee (MAPC) to survey 15 miles of roads in each of 15 towns, including Acton, and worked on preparing a “best practices” report on getting these leaks fixed. The report is here at this link to fixourpipes.org
The survey work was completed in 2016. Green Acton obtained a copy of the leak information via a Public Records request. The spreadsheet on leaks is here.
They found 58 underground leaks of methane (“natural”) gas. Some were quite large: Five on Prospect street were larger than 5,000 square feet.