| Business | Phone |
| Anza Engineering Corp Po Box 730, Brentwood 94513 | (925) 513-2060 |
| De Silva Gates Construction 171 Sand Creek Rd, Brentwood 94513 | (925) 513-2234 |
| Delta Grading Po Box 372, Brentwood 94513 | (925) 634-2659 |
| Dennis Severs Construction 15590 Byron Hwy, Brentwood 94513 | (925) 513-8877 |
| Wasso & Sons Asphalt Mntnce Po Box 604, Brentwood 94513 | (925) 516-2802 |