Eversource is scheduled to survey the transmission lines across several towns in the Greater Danbury area over a five day period. This will take place from today through the 19th, between the hours of 9am and 4pm, weekends included, weather permitting.  Ridgefield Police are alerting residents that they may see a low flying blue and yellow helicopter (Bell 206B3) with tail number N803JB.  Bethel Emergency Management officials say the same chopper will be doing survey work in that town as well.