TxDOT’s Environmental Affairs Division is soliciting proposals for indefinite deliverable, scientific services contracts for conducting karst services and producing karst and geological documentation required for development of transportation facilities under federal and state statutes set forth in the NEPA (42 USC 4321- 4347), the ESA, as amended (7 USC 136; 16 USC 460 et seq.), and other applicable rules, regulations, and laws. Services may include: Karst Habitat Assessments, Karst Terrain Surveys, Excavation, Presence/Absence Surveys and Reporting; Geologic Assessments and Reporting; Solution Feature Discovery Notification Forms and Closure Plans; Edwards Aquifer Protection Plans; Groundwater Analysis and Technical Reporting; Other Protected Karst/Aquifer Species Habitat Analysis, Presence/Absence Surveys, and Reporting; and Biological Assessments/Biological Evaluations.