(A) After completion of construction of the project and before final acceptance of the NOT, a professionally prepared and certified as-built set of plans shall be submitted to the DSM and/or the permitting officer for review. Additionally, a digital copy of the as-built plans in a current version of AutoCad is required. These plans shall include all pertinent data relevant to the completed storm drainage system and storm water management facilities, and shall include:
(1) Pipe size and pipe material;
(2) Invert elevations;
(3) Top rim elevations;
(4) Pipe structure lengths;
(5) BMP types, dimensions, and boundaries/easements;
(6) "As-planted" plans for BMPs, as applicable;
(7) Data and calculations showing detention basin storage volume:
(8) Data and calculations showing BMP treatment capacity;
(9) Certified statement on plans stating the completed storm drainage system and storm water management facilities substantially comply with construction plans and the storm water management permit as approved by the Building and Zoning Department. (See Certificate of Completion and Compliance in the Standards.)
(B) The property owner, developer, or contractor shall be required to file a five-year maintenance bond or other acceptable guarantee with the DSM and/or the permitting officer, prior to acceptance, in an amount of 25% of the cost of the storm water drainage system located outside the public road rights-of-way, and in a form satisfactory to the town's attorney in order to assure that such storm water 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, and that such project was done in accordance with the accepted plans and this chapter. 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 DSM and/or the permitting office.
(C) Deflection tests shall be performed on all flexible pipes after the final backfill has been in place at least 30 days. No pipe shall exceed a vertical deflection of 5%. Deflection testing shall be performed using a mandrel pulled by hand. The mandrel (go/no-go) device shall be cylindrical in shape and constructed with nine or ten evenly spaced arms or prongs. Any sewer not passing the mandrel shall be uncovered, replaced and retested.
(D) The following are considered nonflexible pipes that do not require deflection tests:
(1) Vitrified clay pipe;
(2) Concrete pipe;
(3) Ductile iron pipe; and
(4) Cast iron pipe.
(E) Visual recordings of all storm drainage conveyances shall be required before release of maintenance bonds (refer to § 53.108(B)). These visual recordings will be scheduled by the DSM and/or the permitting officer and paid for by the developer. Notices shall be provided to the DSM and/or the permitting officer within 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 DSM and/or the permitting officer before maintenance bond would be recommended to be released.
(Ord. 2023-22, passed 12-28-23)