FP25-001 Staff Decision - Laserfiche WebLink

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4. Various Agencies were contacted with a request for comments. Marion County Land Development Engineering and Permits (LDEP) commented: ENGINEERING REQUIREMENT A. Drainage conveyance improvements over county lands primarily serving development within City limits shall be contained within public drainage easements dedicated to the City. ENGINEERING ADVISORIES B. The County will not maintain the drainageway primarily serving City development. C. MCPW Engineering does not have permitting jurisdiction over the proposed drainage ditch. The City is responsible for ensuring the conveyance ditch system is sufficient to meet City requirements. D. DEQ regulates ground disturbances equal to or greater than 1.0 acre through the NPDES 1200-C Construction Stormwater Erosion Program. Marion County Building Inspection commented: No building Inspection concerns as it doesn't appear the proposed work will affect any adjacent structures regulated by the state building code. All other agencies either stated no comment or did not respond. 5. The purpose of the Floodplain Overlay Zone is to promote public health, safety and general welfare to minimize public and private losses due to flood conditions. In order to ensure that the development is reasonably safe from flooding, the County requires the development comply with the criteria and standards listed in Section 16.19.130 and 16.19.140 of Marion County Code (MCC). 6. The development area is on the boundary between Marion County Flood Insurance Rate Maps #41047C704G and #41047C708G. These FIRMs indicate the development area is in an AE zone. Based on FIRM panel #41047C708G, and the corresponding Flood Insurance Study, Marion County staff determined the BFE of the development area is 421.8 feet (NVGD29). 7. Marion County Code 16.19.130 requires prior to any development in the floodplain: C. Prior to obtaining a building permit the owner shall be required to sign and record in the deed records for the county a declaratory statement binding the landowner, and the landowner's successors in interest, acknowledging that the property and the approved development are located in a floodplain. The improved ditch is being placed in a easement for the developer until completion, at which time the easement will be conveyed to the City of Stayton. The developer of the easement will be required to record a declaratory statement referencing the recording information for the easement as a condition of approval. D. Prior to obtaining a building permit, commencing development or placing frl in the floodplain the applicant shall submit a certification from a registered civil engineer demonstrating that a development or fill will not result in an increase in floodplain area on other properties and will not result in an increase in erosive velocity of the stream that may cause channel scouring or reduce slope stability downstream of the development or fill. The applicant provided engineer certification from Registered Professional Engineer Mark Grenz of Multi -Tech Engineering Service, INC that the development will not result in any increase in floodplain area on other properties and will not result in an increase in erosive velocity of the stream that could cause channel scouring or reduce slope stability downstream. The criterion is met. Additionally, MCC 16.19.140 provides standards for development in a floodplain: D. Anchoring 1. All new construction and substantial improvements shall be anchored to prevent flotation, collapse or lateral movement of the structure resulting from hydrodynamic and hydrostatic loads, including the effects of buoyancy.