On the technical side, we not only log but photograph everything, down to each clump of toilet paper. We check our progress by doing hundreds of tests identical to what the BLM does, both ahead and behind our main crew; bagging up any debris to be photographed on green screens where the pixels are counted to ensure we’re under the 2.29×10^-3 percent limit.
It’s a stupendous amount of walking, with no shade, a moop stick and a bucket. But it’s a hell of a feeling to be part of making sure we remain undefeated against an impossible task that the future of burning man depends on.