| Business | Phone |
| Apex Envirotech Inc 11244 Pyrites Way, Gold River 95670 | (916) 535-0200 |
| Aei Casc Engineering 2377 Gold Meadow Way # 100, Gold River 95670 | (916) 631-1923 |
| Apex Envirotech Inc 11244 Pyrites Way, Gold River 95670 | (916) 851-0174 |
| Network Environmental Syst Inc 11344 Coloma Rd, Gold River 95670 | (916) 852-6217 |