ORD 2281 - Laserfiche WebLink

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