Well I have ideas but no time. Every year I rent an electric swimming pool pump to drain my pool for $35 a day, which comes with big 4" diameter hoses and it can drain a swimming pool in a matter of a few hours. you would need to keep it elevated off the bottom of the mud hole so all the mud doesn't plug it up but it would be a quick way to get some dirty water out fast, then perhaps bucket and sweep the last few inches out, then the hot az sun could finish the job.
We would at least need a small generator to plug in these small swimming pool pumps too.
Please tell me the track doesn't look like those pics posted last week?