There is no maximum on the number of times you can frequent the Drop-Off Stations. However, there may be a limitation on the amounts and types of material disposed within the last 30 days of your visit.
For example, the limit on construction materials is 10 cubic yards every 30 days, which is approximately 3-4 truckloads. If you are planning to bring a combination of materials, such as brush, household garbage and household recycling, you can bring up to 15 cubic yards every 30 days, which is approximately 4-5 truckloads.
Once you have reached the limitation for a specific item or type of material, you will have to wait 30 days (or other specified timeframe) to dispose of additional amounts of that item, but can continue to bring other materials for disposal at the DOS.