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Ordinance No. 2281 <br />Page 6 of 32 <br />catchment area. <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 />Page 204 of 248