Randall:

"Actually, we are a cleaning crew of sorts, if you count Goblins as the debris.  And I sense you attempt to divert attention from yourself.  Tell us of your involvement in this matter--are you a spy for the goblins or working against them?  Start with the cave-in you just escaped," speaks Randall with authority, knowing he has little time to deal with such matters if they are to get to the pumping station in time.

Insight on his response:  18

Tempe wonders at the man trying to figure him out maybe he's a druid Tempe thinks 8 perception

(Who has a good roll for intimidation? I think Petcan is the most intimidating [has the best stat for that]?)

While we are stopped to talk to him, Z will ask Irraxan to go ahead past this person to see if there is anything interesting at the "cave in" this stanger just came from

Petcan steps close and his first few words are reflexively in draconic before he switches to common. "Wolius svaklar wux re."

"You have just interfered with the defense of the city. Explain yourself -short, sweet, and quick- or you can face immediate, permanent consequences." 

Petcan will also use the helm's detect thoughts DC 13 int save to try to dive into this booger's brain for info 

Oh, I'm sure an intimidation check is in order 23 

"Ok, don't crowd me. I'll share. I mean, it looks like you're down here fighting the goblins too, even though you don't look like your run of the mill soldier."

He scratches at some stubble on his chin.

"I'm not with the goblins, I'm a smuggler. I was working on my tunnel when there was a small cave-in and i stayed down here to clear the debris. That was from yesterday to today. Now when I tried to find a way back up I keep hearing goblin bands roving about down here. With so many goblins flooding into the sewers I realized they must of tunneled into the sewers from their siege line."

"Well other stuff will come flooding in if you stay here. So you better come with us, and if you help us we might let you go,, if not we'll turn you in to the city watch"

Assuming I got nothing suspect from the Detect Thoughts:

"Wait... Will the blocked tunnel mess with the flood at all?"

"This city is blocked from the land so smugglers, would be necessary. What do you smuggle?" Tempe says with curiosity. 

(@Brian: did we get anything from Petcan's Detect Thoughts, Randall's Insight, or from Irraxan checking out the cave-in story? If not, I guess he's telling the truth and probably as trustworthy as a smuggler is going to get)

Petcan's Detect Thoughts show he is concerned with the goblins making their way through the sewers. He has a smuggler's tunnel and doesn't want them disrupting things.

Randall's Insight doesn't reveal any overt deception, I mean he is a smuggler, but it's apparent that he realizes if the goblins win their way into the city there won't be much need for his smuggling things in and out.

Irraxan scouts back the East way and sees where it joins up in accordance with your maps but doesn't find any smuggler's tunnel.

(Seems legit. I guess the smuggler's tunnel is well hidden so at least the Goblins shouldn't find it either. We should probably hurry on to the pumping station)

Quote from Brian_Avery >>

"Ok, don't crowd me. I'll share. I mean, it looks like you're down here fighting the goblins too, even though you don't look like your run of the mill soldier."

He scratches at some stubble on his chin.

"I'm not with the goblins, I'm a smuggler. I was working on my tunnel when there was a small cave-in and i stayed down here to clear the debris. That was from yesterday to today. Now when I tried to find a way back up I keep hearing goblin bands roving about down here. With so many goblins flooding into the sewers I realized they must of tunneled into the sewers from their siege line."

 "It seems we are on the same side then. Come with us, and quickly! First we need to flood these tunnels to rid them of the Goblin invaders. And afterwards we may have need of a smuggler to help us take the fight to the Goblins." Zenodor then tries to hurry the party along to the pumping station as is he worried about time running out the Goblins getting too far.

Randall:

Satisfied that the man was being at least partially truthful, Randall says, “Agreed.  Let us make haste,” and follows quickly after Zenodor.

"Let us know where this Tunnel you speak of is at, please It may end up our only escape." Tempe says worried about this plan they have as he follows the group.

"Agreed! I will stick with you guys if it will help stop these goblins. My tunnel is further North of here, when we get closer to it I will show you but after this is all over I don't want to go to jail. I got a family and mouths to feed"

"Do not worry about that. We are not the town guard and our interest lies in the Goblins - not in a bit of smuggling. If you assist us, I am sure we will be able to reciprocate the favour. Onwards then!"

"Alright then, follow me!"

Mignon leads you back to the first passage leading North, skips the first connecting tunnel West but takes the second, after about a hundred feet in he stops.

"Give me a second."

He fiddles with a stone near the base of the wall and suddenly an entire section opens up. It reveals an hidden corridor that leads off to the North.

"So where does this lead, and how far is the pumping station, do you know?"