The Texas Department of Transportation's Environmental Affairs Division is soliciting proposals for indefinite deliverable, scientific services contracts for performing environmental stormwater services. The services may include outfall mapping and verification, field surveys, Illicit Discharge Detection and Elimination (IDDE) inspections, construction general permit (CGP) inspections, and other tasks required for compliance with stormwater environmental rules and regulations. The contract will be awarded on the basis of qualifications and costs, with a maximum amount payable of $500,000. The proposal should include a team commitment letter, firm and team experience, project manager qualifications, and a price schedule. • Key services: outfall mapping and verification, field surveys, IDDE inspections, CGP inspections • Contract type: indefinite deliverable, scientific services contract • Maximum amount payable: $500,000 • Proposal requirements: team commitment letter, firm and team experience, project manager qualifications, price schedule