Excerpt from Westport Island Shoreland Zoning Ordinance (see latest version in the Town Office)
Section 15 Land Use Standards
Q. Erosion and Sedimentation Control
1. All activities which involve filling, grading, excavation or other similar activities which result in unstabilized soil conditions and which require a permit shall also require a written soil erosion and sedimentation control plan, which need not be prepared by a licensed or certified engineer. The plan shall be submitted to the permitting authority for approval and shall include, where applicable, provisions for:
a. Mulching and revegetation of disturbed soil.
b. Temporary runoff control features such as hay bales, silt fencing or diversion ditches.
c. Permanent stabilization structures such as retaining walls or riprap.
2. In order to create the least potential for erosion, development shall be designed to fit with the topography and soils of the site. Areas of steep slopes where high cuts and fills may be required shall be avoided wherever possible, and natural contours shall be followed as closely as possible.
3. Erosion and sedimentation control measures shall apply to all aspects of the proposed project involving land disturbance, and shall be in operation during all stages of the activity. The amount of exposed soil at every phase of construction shall be minimized to reduce the potential for erosion.
4. Any exposed ground area shall be temporarily or permanently stabilized within one (1) week from the time it was last actively worked, by use of riprap, sod, seed, and mulch, or other effective measures. In all cases permanent stabilization shall occur within nine (9) months of the initial date of exposure. In addition:
a. Where mulch is used, it shall be applied at a rate of at least one (1) bale per five hundred (500) square feet and shall be maintained until a catch of vegetation is established.
b. Anchoring the mulch with netting, peg and twine or other suitable method may be required to maintain the mulch cover.
c. Additional measures shall be taken where necessary in order to avoid siltation into the water. Such measures may include the use of staked hay bales and/or silt fences.
5. Natural and man-made drainage ways and drainage outlets shall be protected from erosion from water flowing through them. Drainage ways shall be designed and constructed in order to carry water from a twenty-five (25) year storm or greater, and shall be stabilized with vegetation or lined with riprap.