| Business | Phone |
| Blue Diamond Excavation Po Box 4364, Walnut Creek 94596 | (925) 935-5475 |
| D C Hauling Walnut Creek 94596 | (925) 933-0776 |
| Montgomery's Backhoe Svc 165 Sylvan Rd, Walnut Creek 94596 | (925) 932-0122 |
| Pacific General Engineering Walnut Creek 94596 | (925) 932-2533 |
| Ted W Yeghoian Grading Inc 964 Scots Ln, Walnut Creek 94596 | (925) 935-4875 |