7. Commitments and Contingencies Environmental Matters Extensive environmental laws regulate our operations and properties. These laws may require us to investigate and clean up hazardous substances, including petroleum or natural gas products, released at our owned and leased properties. Governmental entities or third parties may hold us liable for property damage and personal injuries, and for investigation, remediation and monitoring costs incurred in connection with any contamination and regulatory compliance. We use both underground storage tanks and above ground storage tanks to store petroleum products, natural gas and waste at our locations. We must comply with environmental laws regarding tank construction, integrity testing, leak detection and monitoring, overfill and spill control, release reporting and financial assurance for corrective action in the event of a release. At some locations we must also comply with environmental laws relative to vapor recovery or discharges to water. Under the terms of our leases, we generally have agreed to indemnify HPT for any environmental liabilities related to properties that we lease from HPT and we are required to pay all environmental related expenses incurred in the operation of the properties. From time to time we have received, and in the future likely will receive, notices of alleged violations of environmental laws or otherwise have become or will become aware of the need to undertake corrective actions to comply with environmental laws at our locations. Investigatory and remedial actions were, and regularly are, undertaken with respect to releases of hazardous substances at our locations. In some cases we received, and may receive in the future, contributions to partially offset our environmental costs from insurers, from state funds established for environmental clean up associated with the sale of petroleum products or from indemnitors who agreed to fund certain environmental related costs at locations purchased from those indemnitors. To the extent we i