No context was given. However, this is what I think the sentences mean: 1. Work (probably construction work) is going to be done somewhere (in the area). There may be services in the area. "Services" means such things as gas, water, electricity, telephone, and sewerage. There may be "services" under the ground (underground) (for example, gas lines and sewer lines) or above the ground (for example, electric lines (wires) or telephone lines on poles). Before starting to work in the area, a notification (notice) has to be given that there are no services in the area. (The usual reason is that if someone does work in an area where there are services, he may damage the services, such as by breaking a gas line!) (Notice that "in the area" sounds better than "on the area".) 2. Before buying (purchasing) materials (things out of which other things are made), certain papers concerning the materials (materials documents) must be given (submitted) to the owner [of the land] for his approval.