(A) After completion of construction of the project and before final project acceptance, a professionally prepared and certified “as-built” set of plans shall be submitted to the County Surveyor for review. Additionally, a digital copy of the “as-built” plans is required in a format accepted by the County Surveyor that shall meet metadata requirements for as-built plans. These plans shall include all pertinent data relevant to the completed storm drainage system and stormwater management facilities, and shall include:
(1) Pipe size and pipe material.
(2) Invert elevations.
(3) Top rim elevations.
(4) Elevation of the emergency overflow (spillway) for ponds.
(5) Pipe structure lengths.
(6) BMP types, dimensions, and boundaries/easements.
(7) “As-planted” plans for BMPs, as applicable.
(8) Data and calculations showing detention basin storage volume.
(9) Data and calculations showing BMP treatment capacity.
(10) Certified statement on plans stating the completed storm drainage system and stormwater management facilities substantially comply with construction plans and the stormwater management approval by the County Drainage Board. (See certificate in Stormwater Technical Standards Manual.)
(C) If a maintenance bond and a performance bond is required by the County Drainage Board or the County Surveyor, then the property owner, developer, or contractor shall be required to file a five-year maintenance bond or other acceptable guarantee with the county, prior to final project acceptance, in an amount not to exceed 25% of the cost of the stormwater drainage system located outside the public road right-of-ways, and in a form satisfactory to the County Drainage Board’s attorney in order to assure that such stormwater system installation was done according to standards of good workmanship, that the materials used in the construction and installation were of good quality and construction, that such project was done in accordance with the accepted plans and this chapter, and that any off-site drainage problems that may arise, whether upstream or downstream of such project, will be corrected if such drainage problems are determined by the county to have been caused by the development of such project. The bond or other acceptable guarantee shall be in effect for a period of five years after the date of the final project acceptance by the county.
(D) To verify that all regulated drain tiles are functioning properly, visual recordings (via closed circuit television) of such tile drains shall be required, once following the completion of installation (including the installation of all utility mains) and the second time before release of maintenance bond. These visual recordings will be scheduled by the County Surveyor and paid for by the developer. Notices shall be provided to the county within 72 hours following the completion of installation and again at least 60 days prior to the expiration date of the maintenance bond so that the noted recordings may be scheduled. Reports summarizing the results of the noted visual recordings shall be reviewed and accepted by the county before the plat is recommended for recording and again before maintenance bond would be recommended to be released.
(Ord. 2023-45, passed 12-12-2023)