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5 E Supplement No. 1 to Pro -' ure 718 - Page 2 14. No pile driving will be allowed within 50 feet of the aqueducts. 15. Railroad, freeway and highway crossings of the aqueduct right-of-way shall be on permanent bridges with a minimum vertical clearance of 14 feet 6 inches between the finished ground surface and the underside of the bridge. Crossings on grade will be over structurally-encased aqueducts with a sleeve for a fourth aqueduct. 16. Street and road crossings constructed on grade shall incorporate protection of the aqueducts. Based on the load carrying capability of the aqueduct, protective measures will be designed by the District or by applicant's licensed engineer to District standards with specific District approval of each.design. 17. Traffic control fences or approved barriers.shall be installed along each side of the street, road or trail before opening to the public. 18. Temporary construction fences and barricades shall-be installed by contractor as directed by the District. 19. Any changes in finished grade must be approved by the Aqueduct section. Earthfills or cuts on adjacent property shall not encroach onto District property except where authorized for vehicular crossings on grade and except where the District determines that there will be no detrimental effect on the aqueducts or their maintenance. 20. Pipeline crossings shall be perpendicular to the aqueducts and on a constant grade across District property. Sanitary sewers, water lines or petroleum product lines crossing above the aqueducts must be encased in a steel or PVC conduit or reinforced concrete with a minimum vertical clearance of one foot between the pipeline and the top of District aqueducts. 21. All pipelines crossing below the aqueducts must be encased in a steel or reinforced concrete conduit and provide a minimum of two feet of clearance between the casing and the bottom of the District aqueducts. 22. On pressurized pipe crossings, shutoff valves shall be provided outside and adjacent to both sides of District property. 23. At the point of crossing, steel pipeline crossings and steel casings shall incorporate electrolysis test leads, bgnd leads, and leads necessary for interference testing. Corrosion control devices, when required, must be approved by the District. 24. Cathodic protection for steel encasements must be installed as follows'. • Provide a dielectric coating to the exterior surface of the steel casing within the EBMUD right-of-way, 16 mil epoxy or equivalent. • Provide galvanic protection to the portion of the steel. casing within the EBMUD right- of-way in accordance with the National Association of Corrosion Engineers (NACE) RP-01-69. • If the carrier pipe is constructed of DIP or steel, provide electrical isolation between the carrier and casing using casing insulators; redwood skids are not permitted.