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Ordinance No. 2281 <br /> Page 6 of 32 <br /> 15."GPS Coordinates" means a set of unique identifiers of a precise geographic <br /> location on the earth, usually expressed in alphanumeric characters as the <br /> location's latitude and longitude values. <br /> 16."Green stormwater infrastructure (GSI)" means infrastructure that uses <br /> vegetation, soils, and natural processes to manage water and create healthier <br /> urban environments. At the scale of a city or county, green infrastructure refers to <br /> the patchwork of natural areas that provides habitat, flood protection, cleaner air, <br /> and cleaner water. At the scale of a neighborhood or site, green infrastructure <br /> refers to stormwater management systems that mimic nature by soaking up and <br /> storing water. As Low Impact Development (LID) practices are often <br /> implemented with GSI, these concepts are together referred to as LID/GSI. <br /> 17."Hydromodification" means modification of a stream's hydrograph, caused in <br /> general by increases in flows and durations that result when land is developed <br /> (e.g., made more impervious). The effects of the hydromodification include, but <br /> are not limited to, increased bed and bank erosion, loss of habitat, increased <br /> sediment transportation and deposition, and increased flooding. <br /> 18."Hydromodification management (HM)" means engineered systems designed to <br /> minimize changes to the hydrograph (hydromodification) resulting from <br /> development by matching the flow durations (long-term temporal patterns of <br /> volume and rate) of the pre-project runoff. <br /> 19."Illicit connection" means any device or method that conveys an illicit discharge <br /> to an MS4 or receiving water or any conveyance that has not been documented <br /> in plans, maps, or equivalent records and approved by the City of Pleasanton. <br /> 20."Illicit discharge" means any discharge to the MS4 that is prohibited under local, <br /> state, or federal statutes, ordinances, codes, or regulations. This includes all non- <br /> stormwater discharges not composed entirely of stormwater, except discharges <br /> allowed pursuant to an NPDES permit (other than the NPDES permit for <br /> discharges from the MS4). <br /> 21."Industrial Activity" means any activity that involves manufacturing, processing, or <br /> raw materials storage areas. Further definition of activities covered is provided in <br /> 40 Code of Federal Regulations Section 122.26(b) and the Statewide Industrial <br /> General Permit. <br /> 22."Landscaping" means the planting and maintenance of trees, shrubs, lawns and <br /> other evergreen ground cover or material, including inorganic accessory <br /> materials utilized to accent or complement the vegetation. <br /> 23."Low impact development (LID)" uses site design and stormwater management <br /> to maintain the site's pre-development runoff rates and volumes. The goal of LID <br /> is to mimic a site's predevelopment hydrology by using design techniques that <br /> infiltrate, filter, store, evaporate, detain, and/or biotreat stormwater runoff on or <br />