I have done one of these GWR sites (Electrical System Design/Engineered, plus ran the job).
The Well Pump Motors were small - 5 and 7½ HP, 460V 3Ø - which were "scattered" all around the site.
There were 10 HP and 25 HP Transfer Pumps at the Equipment Compound, along with a tiny 2 HP Sump Pump.
Treatment of Water removed from the Aquifer was done on the Equipment Compound (H²O² "Hydrogen Peroxide" < 26% solution, being the only "near hazardous" chemical).
Ours was nothing compared to the site you are doing!!!
Looks like the site is down in Fountain Valley at the I405 / Euclid-Ellis crush