73 b. Aids to navigation in Canal waters and in proximity thereto. c. Control of vessel movement. d. Operation and maintenance of the locks. e. Tug service for the transit of vessels and dredging for the piers and docks of the Panama Canal Commission. f. Control of the water levels in Gatun, Alajuela (Madden) and Miraflores Lakes. g. Non-commercial transportation services in Canal waters. h. Meteorological and hydrographic services. i. Admeasurement. j. Non-commercial motor transport and maintenance. k. Industrial security through the use of watchmen. 1. Procurement and warehousing. m. Telecommunications. n. Protection of the environment by preventing and controlling the spillage of oil and substances harmful to human or animal life and of the ecological equilibrium in areas used in operation of the Canal and the anchorages. o. Non-commercial vessel repair. p. Air conditioning services in Canal installations. q. Industrial sanitation and health services. TIAS 10030