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§ 10.56 k. Placement of natural rock rip rap, including associated grading of the shoreline and placement of a filter blanket,is permitted if the finished slope does not exceed 3 feet horizontal to 1 foot vertical,the landward extent of the rip rap is within 10 feet of the Ordinary High Water Level,and the height of the rip rap above the Ordinary High Water Level does not exceed 3 feet. A rip rap permit shall be obtained per the requirements of Section 10.03, Subdivisions 22, 23 and 24 of this zoning code. 6. Connections to Public Waters. Excavations where the intended purpose is connection to a public water, such as boat slips, canals, lagoons, and harbors, are prohibited above the Ordinary High Water Level. Such excavations below the elevation or the OrdinaryHigh Water Level are subject to approval ofthe Department ofNatural Resources and other agencies with concurrent jurisdiction. K. Storm Water Management.The following general and specific standards shall apply in addition to those standards found in Sections 10.55 and 11.41 of the Orono Municipal Code: 1. When possible, existing natural drainageways, wetlands, and vegetated soil surfaces must be used to convey, store, filter and retain storm water run-off before discharge to public waters. 2. A development must be planned and conducted in a manner that will minimize the extent of disturbed areas, run-off velocities, erosion potential, and reduce and delay run-off volumes. Disturbed areas must be stabilized and protected as soon as possible and facilities or methods used to retain sediment on the site. 3. When development density, topographic features, and soil and vegetation conditions are not sufficient to adequately handle storm water run-off using natural features and vegetation, various types of constructed facilities such as diversions, settling basins, skimming devices, dikes, waterways, and ponds may be used. Preference must be given to designs using surface drainage,vegetation, and infiltration rather than buried pipes and manmade materials and facilities. 4. When constructed facilities are used to perform water management, documentation must be provided by a registered professional civil engineer that they are designed and installed consistent with the field office technical guide of the local soil and water conservation district. 5. New constructed storm water outfalls to public waters must provide for filtering or settling of suspended solids and skimming of surface debris before discharge. ORONO CC 376-17 (2�24-92)