underline-strikeout version of the final draft ordinance - Pima County ...

For May 4, 2010 BOS HearingTHIS THE CLERK OF THE BOARD FORMAT!!!B. All development plans and tentative plats must shall be accompanied by conceptual gradingplans and conceptual drainage improvement plans, as needed, to demonstrate:1. The methods for flood proofing and/or drainage control for the development, includingsufficient lot grading information to demonstrate adequate finished pad elevations and/ordrainage slopes and paths to guide water away from structures and protect building foundationsincluding all structures within Zones, A, AE, AO, AH and sShadesd X;2. That improvements are compatible with the existing upstream and downstream drainageconditions and that any proposed grading and/or grade change will not have an adverse impacton surrounding properties;3. When development is proposed to encroach into a regulatory floodplain or is completelysurrounded by floodwaters, maximum encroachment limits shall be shown;43. The methods of erosion and sediment control during construction and post construction; and54. The methods of mitigating increased urban peak and volumetric flood water runoff ordischarge on downstream properties created as a result of the development.C. A floodplain use permit is required prior to commencement of any site improvements orgrading associated with a subdivision development as a whole or for individual lot(s) within thesubdivision. A grading plan must be submitted to the District for review and approval. Detailedimprovement plans for storm drains or channel improvements must also be submitted to the samedepartment for review and approval. Where a grading plan or detailed drainage improvementplans are not provided, the Chief Engineer may require additional information and engineeringplans prior to issuing a floodplain use permit. Certifications of elevation shall be requiredpursuant to 16.20.070, until the LOMR is approved by FEMA.D. Drainage and grading improvements that are required to mitigate off-site adverse impacts ofthe proposed development shall be constructed, and as-built plans prepared and submitted to theDistrict. The as-built plans require the District’s approval prior to the issuance of any buildingpermits, except for model home permits and any permits necessary to build the drainageinfrastructure.E. Drainage and grading improvements that are required to mitigate on-site impacts shall beconstructed, and as-built plans prepared and submitted to the District. The as-built plans requirethe District’s approval prior to the Release of Assurances for subdivisions, and prior to theissuance of the Certificate of Occupancy for development plans.F. All on-site and off-site grading and construction shall comply with the federal Clean WaterAct including providing construction and post-construction controls for storm water quality.(Ord. 2010 FC-1; Ord. 2005 FC-2 § 2 (part), 2005, Ord. 1999 FC-1 § 1 (part), 1999; Ord. 1988FC-2 Art. 11 (B) (2), (3), (4), 1988)16.36.040Floodplain and floodway boundaries - Drainage areas.A. All final plats and development plans shall indicate the limits of the regulatory floodplains,erosion hazard boundaries, maximum encroachment limits, when applicable, and the limits of thefederally established regulatory floodplains and floodways (if applicable), and be delineated in asurveyable manner and sealed by an Arizona registered land surveyor.B. All final plats shall indicate both drainage areas and their respective base flood peakdischarges, with a note contained on the final plat that the drainage areas and base flood peakdischarges are provided by the owner for information purposes only.58