| Business | Phone |
| Engineering Resource Group Inc 2413 Grand Ave, Des Moines 50312 | (515) 288-4823 |
| J F Kintz Engineering 5499 Ne 14th St, Des Moines 50313 | (515) 223-0189 |
| Earth Tech Inc 500 Sw 7th St 301, Des Moines 50309 | (515) 244-1470 |
| Mi Property Llc 4010 University Ave, Des Moines 50311 | (515) 279-7767 |