Design and Construction Standards - Tualatin Valley Water District

Water System Design and Construction Standards Section 11.9 Easementsa. Where it is not practical or possible to install water system improvements within adedicated public right-of-way, the District may allow the improvements to beinstalled within a dedicated easement on private property.b. Water line easements shall be centered on the pipe. Minimum easement widthsshall be 15 feet for areas with vehicular access (roadways, parking lots, etc.) and20 feet for areas without vehicular access. Additional width may be required forspecial circumstances such as slopes or other cases as determined by theDistrict.c. Easements for vaults or other water system appurtenances shall extend aminimum of 5 feet on all sides of the structure. Additional width may be requiredfor special circumstances such as slopes or other cases as determined by theDistrict.d. Easements granted to the District shall allow for access, construction, operations,maintenance, replacement, reconstruction, and removal of the water systemimprovements.e. The easement shall be solely for water systems improvements and not shared byother utilities or structures without the prior written consent of the District.f. If access to the easement area and associated appurtenances is not directlyavailable from a public right-of-way, an access easement along the most directroute of access shall be granted to the District.g. Easement exhibits shall be prepared by a Professional Land Surveyor. Easementdimensions and language shall be subject to final approval by the District.Easements shall be recorded prior to final project approval.1.10 General Design Requirementsa. Any permanent appurtenance that is above sidewalk and/or finish grade shall beat least 18 inches behind the sidewalk. No permanent signs, structures, or plantmaterials are allowed within three feet of District facilities.b. In locations outside of the established right-of-way, mark water lineappurtenances, such as valves, blowoff assemblies, and cathodic protection teststations, with a Carsonite marking post. Post shall be blue in color, a minimumwidth of 3.5 inches, and be set with the top of post three feet above finishedgrade.1.11 General Materials Requirementsa. Only materials designed for potable water service and meeting NSF Standard 61,the American Water Works Association (AWWA) standards, and other applicablestandards shall be used in those elements of the water system which may comein contact with potable water. All materials must be certified “lead-free”.b. All materials used for water system construction shall be of new manufacture. Norebuilt, reconditioned, or previously used materials shall be used.TVWD Water System Standards June 2012 Page 1-5