Surface Water Management (Title 13) | Environment & Sustainability
of soil. Lawns, landscaping, sports fields, artificial turf with an underdrain, golf courses, and other areas that have modified runoff characteristics resulting from the addition of underdrains that have the pollution-generating characteristics described under the “pollution-generating pervious surface” definition are also considered PGIS. 59. Pollution-generating pervious surface. A nonimpervious surface considered to be a significant source of pollutants in surface and stormwater runoff. “Pollution-generating pervious surfaces” include surfaces subject to the use of pesticides and fertilizers, to the use or storage of erodible or leachable materials, wastes or chemicals or to the loss of soil. “Pollution-generating pervious surface” includes, but is not limited to, the lawn and landscaped areas of a residential or commercial site, golf course, park, sports field artificial turf without an underdrain, and City-standard grassed modular grid pavement. 60. Project. Any proposed action to alter or develop a site that may also require drainage review. 61. Project site. The portion of a site and any off-site areas subject to proposed project activities, alterations and improvements including those required by this chapter. 62. Public Health. The level of well-being of the general population; those actions in a community necessary to preserve, protect, and promote the health of the people for which government is responsible; and the governmental system developed to guarantee the preservation of the health of the people.
63. Rate category. The classification in this chapter given to a parcel in the service area based upon the type of land use on the parcel and the percentage of impervious surface area contained on the parcel. 64. Redevelopment project. A project that proposes to add, replace or modify impervious surface for purposes other than a residential subdivision or maintenance on a site that: a. Is already substantially developed in a manner that is consistent with its current zoning or with a legal nonconforming use; or b. Has an existing impervious surface coverage of 35 percent or more. 65. Repeat violation. A violation of the same regulation in any location in the city within six years from the calendar date of the prior violation by the same responsible party for which compliance previously has been sought or a Notice and Order has been issued. For example, if a violation that occurred on July 1, 2023, a repeat violation would be a subsequent violation that occurs on or before June 30, 2029. 66. Replaced impervious surface. An existing impervious surface proposed to be removed and reestablished as impervious surface, excluding impervious surface removed for the sole purpose of installing utilities or performing maintenance on underground infrastructure. For structures, “removed” means the removal of buildings down to the
foundation. For other impervious surfaces, “removed” means the removal down to base course or bare soil. It does not include the removal of pavement material
Effective | January 1, 2022 Revisions | June 29, 2022
Title 21: Sammamish Development Code | 139
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