So I'm staking a few thousand feet of TBC for a few huge warehouses, getting wood into the ground.
Cruising along, and as I'm wrapping up, this guy walks by the stakes and then circles back.
He asks "What does PC and PT mean?"
I respond "That's a great question!".
I pull out the field book and proceed to draw a circle and a few lines and explaining the two curb lines are the tangents, but they'll be called PC point of curvature and PT point of tangency, and can be used interchangeably. He smiles, 'Yes I understand this."
"Are you giving a radius point?"
"No, not for curves this small because it makes it confusing for the layout form crew when they're this close to the PC/PT points."
Today, similar question for a sidewalk(different guy) that is parallel to the TBC fo about 300' then the the TBC departs the pattern in a larger arc and a different degree of curvature, leaving a little bit of space for landscaping and a quandary for them.
I don't have the Radius Point they're looking for(but realized I could calculate it(and won't because it's not our scope of work on this job) and make his life easier) and pulled out the same diagram from previous day and walked him through the same lesson on geometry.
Site super and I talked about it and he gave them the go ahead to just mono pour the Sidewalk and TBC to eliminate the difference in space due to the two different curves and all is ok.
What do you do in the field when the end users start asking you what the stuff on your stakes means, and do you feel comfortable doing that or do you avoid the possibility of them screwing up and blaming you for a mistake?
And Go!!!
