| Business | Phone |
| Access Inc 2034 Cotner Ave # 303, Los Angeles 90025 | (310) 479-7183 |
| L A Soil 11500 W Olympic Blvd # 400, Los Angeles 90064 | (310) 312-4565 |
| Praad Geotechnical 5465 S Centinela Ave, Los Angeles 90066 | (310) 578-5731 |
| Ralph Stone & Co Engineers Inc 10954 Santa Monica Blvd, Los Angeles 90025 | (310) 478-1501 |
| Ninyo & Moore Geotechnical 700 S Flower St # 1100, Los Angeles 90017 | (213) 488-5111 |
| Geotechnical Solutions Inc 501 S Fairfax Ave # 101, Los Angeles 90036 | (323) 599-8800 |
| Ortho Engineering Inc 1750 S La Cienega Blvd, Los Angeles 90035 | (310) 559-6229 |
| Don Soils Engineering Co 2225 S La Brea Ave, Los Angeles 90016 | (323) 464-2439 |
| Diversified Dirt Solutions 6731 Princess Dr, Los Angeles 90042 | (323) 257-0308 |