Please assist with analysis of this interference discovered onsite

All I can really see here is normal WiFi (802.11b) activity on channels 1, 6, and 11. Since there are maybe 8-10 networks on these channels, this could all be purely management overhead, aka, each SSID broadcasting beacon frames 10 times every millisecond. To lessen this, it is important to keep only 2 or 3 virtual SSIDs and make sure that there is only one radio at -67 dBm or better. This video talks about this a little bit more.

Also keep in mind that since the interference is green, that less than 20-30 percent of the spectrum is being utilized, enough time to talk for clients on the network. The blue interference is less than 10% and it typically bluetooth or other light interference. This article discusses this more:

How to use the Density View

Please let me know if you have any other questions.