The tape can be found in Forest Grove Marsh on top of a house on the west side of town near the four way traffic lights.
Sheila: Listen Dale, I don't know what's taking you so long but you were supposed to meet me here three days ago. I'm out of supplies and I'm gonna have to make a run. I can see why that Solomon guy is willing to pay so much for these ferns cause let me tell ya getting walkways set up here has been a real pain in my ass. Wait for me to get back before you take the first load to Diamond City, I've got a couple things I want-
Dale: -Hey! Sheila! That you up there? The walkways look great, but how do I get up there?
Sheila: There you are! Took your sweet time, Dale. Head over a block there's-
(Feral ghoul sounds)
Oh Shit! Ferals! Dale look out! Run! Run!