What should I do with my 30 gallons of sewage?

My dog uses my backyard every day, and I also let my upstairs neighbors’ dog relieve herself there. My neighbors and I always throw the doggie bags into my backyard trashcan, which we normally empty every week. Unfortunately, a contractor was back there last week doing some work for my landlord and used the trashcan, but left the lid off. We were away for a few days, and it has been raining a LOT here in New Jersey recently…so now I have a big trash can swimming with dogshit water, yard trimmings, cigarette butts, ash from my grill, and various other grossness.

It’s not an option to get the contractors to take care of this – they are next to useless. My landlord’s great otherwise, but my boyfriend and I have had to do all home fixes ourselves.

So…what do I do? Getting it from the backyard through the hallway to the front is going to be hellish enough – I’m thinking siphoning into buckets is going to be the way. But then what? I’m guessing I can’t just leave it for the garbagemen, since it’s fluid…would I have to arrange for a special pickup? Or should I cover the inside of my minivan with tarps and drive really slowly to the dump? It is impossible to get ahold of a living person at Jersey City’s Department of Sanitation. I make through their phone tree; there’s no operator; I try each extension; no one answers…

Any Jellies with experience dumping hazardous waste as a civilian and as non-medical personnel?

I posted this in General because I really need help, but please feel free to joke a bit too. I must admit, my first thought was the MITM catapult.