The best way to dispose of the excess OLEA would be to:

Using the product consistent with the label is the best disposal method for excess OLEA because it ensures that the pesticide is applied safely and effectively according to the manufacturer's guidelines. The label provides specific instructions on how to use the product, including recommended application rates, target pests, and any restrictions on use. By following these instructions, you can mitigate environmental impact, reduce the risk of pesticide contamination, and ensure proper management of the product, which aligns with best practices for pesticide use and safety.

In many cases, labels also include directives on how to handle leftover product, suggesting that leftover quantities may often be used in a manner that complies with label instructions. This practice not only helps in managing leftover pesticide but also promotes responsible use, adhering to legal and environmental standards.

Other disposal methods, such as taking it to the landfill or back to a hazardous waste facility, while potentially viable in some contexts, do not address the intent of the question regarding how to manage excess product according to established guidelines. Burying the product on personal property is heavily discouraged due to potential soil and groundwater contamination, making it an inappropriate disposal method.