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Supplement No. 1 to Pr�.ure 718 Page 3 • Provide test results to EBMUD demonstrating the adequacy of the cathodic protection system, and the adequacy of the electrical isolation of the carrier(if metallic)from the casing. EBMUD reserves the right to witness any such tests. 25. Gravity drainage of District property shall be maintained. Open channels constructed across the right-of-way shall be paved with reinforced concrete. Headwalls, inlets, and other appurtenances shall be located outside EBMUD property. Drainage facilities shall be provided outside the District's property at the top and/or toe of fill slopes or cuts constructed adjacent to District property to assure adequate drainage. 26. Overhead electrical power conddctors across the property shall be a minimum of 30 feet above ground. Communication and cable TV crossings shall be a minimum of 20 feet above the ground. Supporting poles or towers shall be located outside the aqueduct right- of-way. 27. Buried electrical cables passing over the aqueducts shall be installed in conduit and encased in red concrete across the entire width of the right-of-way. All other buried cables shall be installed in conduit and marked in the appropriate Underground Service Alert (USA) colored marking materials across the entire width of the aqueduct right-of-way. The minimum vertical clearance between the conduit and the top of the District's aqueducts is one foot. 28. Electrical or telecommunications'cables passing under the aqueducts shall be encased in conduit and marked at both edges of the aqueduct right-of-way with the appropriate USA color coded markers. The minimum vertical clearance between the conduit and the bottom of the District's aqueducts is two:feet. For directional bored conduits the minimum vertical clearance is five feet. 29. Vehicular parking and storage of equipment or material on aqueduct property are specifically prohibited. 30. Extraction of oil and gas from aqueduct properties may be permitted under appropriate lease agreements. l 31. All EBMUD survey monuments and markers shall be undisturbed. If any EBMUD survey markers or monuments must be disturbed, they will be replaced or relocated by EBMUD at applicant's expense prior to the start of any ground disturbing work. 32. All aqueduct crossings involving mechanical excavation on the right-of-way require potholing of all three aqueducts at the site of the proposed crossing. Visible reference markings showing the aqueduct alignments and depths to top of pipe shall be maintained for the duration of any mechanical excavation on EBMUD property. Entry permits are required for pothole work., 33. All grading or-excavating of the right-of-way requires Underground Service Alert (USA) notification and the maintenance of a current inquiry identification number. 34. Certified six-sack mix is the minimum acceptable concrete batch to be used on the aqueduct right-of-way. Concrete compression strength shall be 3000 PSI or better at 28 days. If samples do not reach 3000 PSI at 28 days, entire section of slab or encasement related to that sample must be removed and replaced at applicant's expense.