|(a) A person may not undertake the development of a tract of land that is greater than one acre in area unless the person conducts a soil test prior to or during development and construction. The soil test is intended to determine if a landfill exists on the property planned for development. (b) A soil test under this section shall be conducted by a licensed professional engineer. (c) The licensed professional engineer must choose one of the following tests. (1) Test I. The licensed engineer shall observe all subsurface disturbances, undertaken for whatever reason, during development through the completion of the foundation. A subsurface investigation prior to construction is not required by Test I. (2) Test II. A subsurface investigation undertaken for the purpose of finding a closed municipal solid waste landfill unit. The investigation must incorporate a sufficient number of borings or excavations, the number of which shall be determined on a site-specific basis by the licensed professional engineer. Each boring or excavation shall be to a minimum depth of ten feet. (3) Test III. A subsurface investigation conducted at the development site for geotechnical or environmental purposes, or a housing and urban development test for a homeowner's warranty. (d) In accordance with Texas Health and Safety Code, §361.538(c), any engineer who conducts a soil test and determines that part of the tract overlies a closed municipal solid waste landfill shall notify the following persons of that determination within 30 days of the completion of the test: (1) each owner and each lessee of the tract; (2) the executive director; (3) local government officials with the authority to disapprove the application for development; and (4) the regional council of governments. (e) The responsible engineer shall affix his seal, signature, and date of execution to the soil test results as required by the Texas Engineering Practice Act, §15c, and in accordance with 22 TAC §131.166 (relating to Engineer's Seal). (f) All soil test excavations where waste is removed shall be backfilled and compacted with clean high-plasticity or low-plasticity clay. The excavation shall be backfilled to exceed the existing grade and provide positive drainage.