Before the development (dump, blade & scrape) got underway, the US Department of the Interior did a 15-page study of the cacti. Here’s a link to the 15 December 2004 report.
Many cacti, including Ocotillo, were moved to the 5-acre lot adjacent to Unit 8, here’s an aerial view of the transplant area. Next time I go out there I will take pics.
The prior majority lot owners paid a lot of money for tagging the Pineapples and transplanting the cacti, they also dumped 10,000 dump-truck loads of dirt (and allegedly paid lots of money to test the dirt for radiation, etc.) on Unit 5 to level it off for the sewer-slope.