Suggestions for emptying blackwater tank with no pumpout available

[Scott Fuller]

We have purchased a boat that has been on the hard for a couple of years with blackwater in the plastic holding tank. Now that the temperatures are rising, the stench is as well. A previous owner did a horrific job of replacing the tank and hoses, a photo of which I have included as supporting evidence of my assessment. The entire system needs to come out and be done over. The previous effort included eliminating the overboard discharge, and the boat is on the hard in a yard with no portable pump out. As we are several weeks from launch, and after launch have a 500 mile delivery I would very much like to have this project completed prior to launch. I'm looking for suggestions as to the best solution for emptying the tank while it is in place.

Thank you,
Scott